SE97 DDR memory module temp sensor with integrated SPD, 3.3 V Rev. 07 -- 29 January 2010 Product data sheet 1. General description The NXP Semiconductors SE97 measures temperature from -40 C to +125 C with JEDEC Grade B 1 C accuracy between +75 C and +95 C and also provide 256 bytes of EEPROM memory communicating via the I2C-bus/SMBus. It is typically mounted on a Dual In-line Memory Module (DIMM) measuring the DRAM temperature in accordance with the new JEDEC (JC-42.4) Mobile Platform Memory Module Temperature Sensor Component specification and also replacing the Serial Presence Detect (SPD) which is used to store memory module and vendor information. The SE97 thermal sensor operates over the VDD range of 3.0 V to 3.6 V and the EEPROM over the range of 3.0 V to 3.6 V write and 1.7 V to 3.6 V read. Placing the Temp Sensor (TS) on a DIMM allows accurate monitoring of the DIMM module temperature to better estimate the DRAM case temperature (Tcase) to prevent it from exceeding the maximum operating temperature of 85 C. The chip set throttles the memory traffic based on the actual temperatures instead of the calculated worst-case temperature or the ambient temperature using a temp sensor mounted on the motherboard. There is up to 30 % improvement in thin and light notebooks that are using one or two 1 GB SO-DIMM modules. The TS is required on DDR3 RDIMM and RDIMM ECC. Future uses of the TS will include more dynamic control over thermal throttling, the ability to use the Alarm Window to create multiple temperature zones for dynamic throttling and to save processor time by scaling the memory refresh rate. The TS consists of a Analog-to-Digital Converter (ADC) that monitors and updates its own temperature readings 10 times per second, converts the reading to a digital data, and latches them into the data temperature register. User-programmable registers, the specification of upper/lower alarm and critical temperature trip points, EVENT output control, and temperature shutdown, provide flexibility for DIMM temperature-sensing applications. When the temperature changes beyond the specified boundary limits, the SE97 outputs an EVENT signal using an open-drain output that can be pulled up between 0.9 V and 3.6 V. The user has the option of setting the EVENT output signal polarity as either an active LOW or active HIGH comparator output for thermostat operation, or as a temperature event interrupt output for microprocessor-based systems. The EVENT output can even be configured as a critical temperature output. The EEPROM is designed specifically for DRAM DIMMs SPD. The lower 128 bytes (address 00h to 7Fh) can be Permanent Write Protected (PWP) or Reversible Write Protected (RWP) by software. This allows DRAM vendor and product information to be stored and write protected. The upper 128 bytes (address 80h to FFh) are not write protected and can be used for general purpose data storage. SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V The SE97 has a single die for both the temp sensor and EEPROM for higher reliability and supports the industry-standard 2-wire I2C-bus/SMBus serial interface. The SMBus TIMEOUT function is supported to prevent system lock-ups. Manufacturer and Device ID registers provide the ability to confirm the identity of the device. Three address pins allow up to eight devices to be controlled on a single bus. 2. Features 2.1 General features JEDEC (JC-42.4) TSE 2002B3 DIMM 0.5 C (typ.) between 75 C and 95 C temperature sensor plus 256-byte serial EEPROM for Serial Presence Detect (SPD) Optimized for voltage range: 3.0 V to 3.6 V, but SPD can be read down to 1.7 V Shutdown current: 0.1 A (typ.) and 5.0 A (max.) 2-wire interface: I2C-bus/SMBus compatible, 0 Hz to 400 kHz SMBus ALERT Response Address and TIMEOUT (programmable) ESD protection exceeds 2500 V HBM per JESD22-A114, 250 V MM per JESD22-A115, and 1000 V CDM per JESD22-C101 Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA Available packages: TSSOP8, HVSON8, HXSON8, HWSON8 (JEDEC PSON8 VCED-3) 2.2 Temperature sensor features 11-bit ADC Temperature-to-Digital converter with 0.125 C resolution Operating current: 250 A (typ.) and 400 A (max.) Programmable hysteresis threshold: off, 0 C, 1.5 C, 3 C, 6 C Over/under/critical temperature EVENT output B grade accuracy: 0.5 C/1 C (typ./max.) +75 C to +95 C 1.0 C/2 C (typ./max.) +40 C to +125 C 2.0 C/3 C (typ./max.) -40 C to +125 C 2.3 Serial EEPROM features Operating current: Write 0.6 mA (typ.) for 3.5 ms (typ.) Read 100 A (typ.) Organized as 1 block of 256 bytes [(256 x 8) bits] 100,000 write/erase cycles and 10 years of data retention Permanent and Reversible Software Write Protect Software Write Protection for the lower 128 bytes SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 2 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 3. Applications DDR2 and DDR3 memory modules Laptops, personal computers and servers Enterprise networking Hard disk drives and other PC peripherals 4. Ordering information Table 1. Ordering information Type number Topside Package mark Name Description Version SE97PW SE97 TSSOP8 plastic thin shrink small outline package; 8 leads; body width 4.4 mm SOT530-1 SE97TK SE97 HVSON8 plastic thermal enhanced very thin small outline package; no leads; 8 terminals; body 3 x 3 x 0.85 mm SOT908-1 SE97TL[1] 97L HXSON8 plastic thermal enhanced extremely thin small outline package; no leads; 8 terminals; body 2 x 3 x 0.5 mm SOT1052-1 SE97TP[1][2][3] S97 HWSON8 plastic thermal enhanced very very thin small outline package; no leads; 8 terminals; body 2 x 3 x 0.8 mm SOT1069-1 SE97TP/S900[1][2][3] S97 HWSON8 plastic thermal enhanced very very thin small outline package; no leads; 8 terminals; body 2 x 3 x 0.8 mm SOT1069-2 [1] SE97TL and SE97TP offer improved VPOR/EVENT IOL. [2] Industry standard 2 mm x 3 mm x 0.8 mm package to JEDEC VCED-3 PSON8 in 8 mm x 4 mm pitch tape 4 k quantity reels. [3] SOT1069-1 is manufactured in APHK Hong Kong and SOT1069-2 is manufactured in APB Bangkok. The third line of the topside marking will start with `P' for SPHK and `n' for APB. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 3 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 5. Block diagram SE97 TEMPERATURE REGISTER CRITICAL ALARM TRIP UPPER ALARM TRIP LOWER ALARM TRIP POR VDD BAND GAP TEMPERATURE SENSOR VSS 11-BIT ADC CAPABILITY EVENT MANUFACTURING ID SMBus/I2C-BUS INTERFACE DEVICE/REV ID SCL SDA FILTER SMBus TIMEOUT/ALERT CONFIGURATION * * * * * * * HYSTERESIS SHUT DOWN TEMP SENSOR LOCK PROTECTION EVENT OUTPUT ON/OFF EVENT OUTPUT POLARITY EVENT OUTPUT STATUS CLEAR EVENT OUTPUT STATUS 2-kbit EEPROM 10 V OVERVOLTAGE FFh NO WRITE PROTECT A0 R 30 k to 800 k A1 80h 7Fh R 30 k to 800 k SOFTWARE WRITE PROTECT POINTER REGISTER 00h A2 R 30 k to 800 k 002aab349 Fig 1. Block diagram of SE97 SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 4 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 6. Pinning information 6.1 Pinning terminal 1 index area A0 1 A1 2 A2 3 VSS 4 SE97PW VDD 7 EVENT SCL 5 SDA 1 A1 2 VDD 7 EVENT A2 3 6 SCL VSS 4 5 SDA 002aad548 Transparent top view 002aab805 Fig 2. 8 SE97TL 8 6 A0 Pin configuration for TSSOP8 Fig 3. Pin configuration for HXSON8 terminal 1 index area terminal 1 index area A0 1 8 VDD A1 2 7 EVENT A2 3 6 SCL VSS 4 5 SDA SE97TK A0 1 A1 2 VDD 7 EVENT SE97TP A2 3 6 SCL VSS 4 5 SDA 002aab803 002aad768 Transparent top view Fig 4. 8 Transparent top view Pin configuration for HVSON8 Fig 5. Pin configuration for HWSON8 (SOT1069-1) SE97TP/S900 terminal 1 index area A0 1 8 VDD A1 2 7 EVENT A2 3 6 SCL VSS 4 5 SDA 002aaf007 Transparent top view Fig 6. Pin configuration for HWSON8 (SOT1069-2) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 5 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 6.2 Pin description Table 2. Pin description Symbol Pin Type Description A0 1 I I2C-bus/SMBus slave address bit 0 with internal pull-down. This input is overvoltage tolerant to support software write protection. A1 2 I I2C-bus/SMBus slave address bit 1 with internal pull-down A2 3 I I2C-bus/SMBus slave address bit 2 with internal pull-down VSS 4 ground device ground SDA 5 I/O SMBus/I2C-bus serial data input/output (open-drain). Must have external pull-up resistor. SCL 6 I SMBus/I2C-bus serial clock input/output (open-drain). Must have external pull-up resistor. EVENT 7 O Thermal alarm output for high/low and critical temperature limit (open-drain). Must have external pull-up resistor. VDD 8 power device power supply (3.0 V to 3.6 V); supports 1.7 V for EEPROM read only. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 6 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 7. Functional description 7.1 Serial bus interface The SE97 communicates with a host controller by means of the 2-wire serial bus (I2C-bus/SMBus) that consists of a serial clock (SCL) and serial data (SDA) signals. The device supports SMBus, I2C-bus Standard-mode and Fast-mode. The I2C-bus standard speed is defined to have bus speeds from 0 Hz to 100 kHz, I2C-bus fast speed from 0 Hz to 400 kHz, and the SMBus is from 10 kHz to 100 kHz. The host or bus master generates the SCL signal, and the SE97 uses the SCL signal to receive or send data on the SDA line. Data transfer is serial, bidirectional, and is one byte at a time with the Most Significant Bit (MSB) is transferred first. Since SCL and SDA are open-drain, pull-up resistors must be installed on these pins. 7.2 Slave address The SE97 uses a 4-bit fixed and 3-bit programmable (A0, A1 and A2) 7-bit slave address that allows a total of eight devices to coexist on the same bus. The A0, A1 and A2 pins are pulled LOW internally. The A0 pin is also overvoltage tolerant supporting 10 V software write protect. When it is driven higher than 7.8 V, writing a special command would put the EEPROM in reversible write protect mode (see Section 7.10.2 "Memory protection"). Each pin is sampled at the start of each I2C-bus/SMBus access. The temperature sensor's fixed address is `0011b'. The EEPROM's fixed address for the normal EEPROM read/write is `1010b', and for EEPROM software protection command is `0110b'. Refer to Figure 7. slave address R/W MSB 0 LSB 0 1 fixed 1 A2 A1 A0 002aab304 Fig 7. R/W MSB X hardware selectable a. Temperature sensor slave address 1 LSB 0 1 fixed 0 A2 A1 A0 slave address R/W MSB X hardware selectable 002aab351 b. EEPROM (normal read/write) 0 LSB 1 1 fixed 0 A2 A1 A0 X hardware selectable 002aab352 c. EEPROM (software protection command) Slave address SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 7 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 7.3 EVENT output condition The EVENT output indicates conditions such as the temperature crossing a predefined boundary. The EVENT modes are very configurable and selected using the configuration register (CONFIG). The interrupt mode or comparator mode is selected using CONFIG[0], using either TCRIT/UPPER/LOWER or TCRIT only temperature bands (CONFIG[2]) as modified by hysteresis (CONFIG[10:9]). The UPPER/LOWER (CONFIG[6]) and TCRIT (CONFIG[7]) bands can be locked. Figure 8 shows an example of the measured temperature versus time, with the corresponding behavior of the EVENT output in each of these modes. Upon device power-up, the default condition for the EVENT output is high-impedance to prevent spurious or unwanted alarms, but can be later enabled (CONFIG[3]). EVENT output polarity can be set to active HIGH or active LOW (CONFIG[1]). EVENT status can be read (CONFIG[4]) and cleared (CONFIG[5]). * Advisory note: - NXP device: After power-up, bit 3 (1) and bit 2 or bit 0 (leave as 0 or 1) can be set at the same time (e.g., in same byte) but once bit 3 is set (1) then changing bit 2 or bit 0 has no effect on the device operation. - Competitor device: Does not require that bit 3 be cleared (e.g., set back to (0)) before changing bit 2 or bit 0. - Work-around: In order to change bit 2 or bit 0 once bit 3 (1) is set, bit 3 (0) must be cleared in one byte and then change bit 2 or bit 0 and reset bit 3 (1) in the next byte. - SE97B will allow bit 2 or bit 0 to be changed even if bit 3 is set. If the device enters Shutdown mode (CONFIG[8]) with asserted EVENT output, the output remains asserted during shutdown. 7.3.1 EVENT pin output voltage levels and resistor sizing The EVENT open-drain output is typically pulled up to a voltage level from 0.9 V to 3.6 V with an external pull-up resistor, but there is no real lower limit on the pull-up voltage for the EVENT pin since it is simply an open-drain output. It could be pulled up to 0.1 V and would not affect the output. From the system perspective, there will be a practical limit. That limit will be the voltage necessary for the device monitoring the interrupt pin to detect a HIGH on its input. A possible practical limit for a CMOS input would be 0.4 V. Another thing to consider is the value of the pull-up resistor. When a low supply voltage is applied to the drain (through the pull-up resistor) it is important to use a higher value pull-up resistor, to allow a larger maximum signal swing on the EVENT pin. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 8 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Tth(crit) - Thys temperature (C) critical Ttrip(u) - Thys Ttrip(u) - Thys Upper Boundary Alarm Tamb Ttrip(l) - Thys Lower Boundary Alarm Ttrip(l) - Thys time EVENT in Comparator mode EVENT in Interrupt mode software interrupt clear EVENT in `Critical Temp only' mode (1) (2) (1) (3) (4) (3)(5) * (6) (4) (2) 002aae324 Refer to Table 3 for figure note information. Fig 8. Table 3. Figure note EVENT output condition EVENT output condition EVENT output boundary conditions EVENT output Comparator mode Interrupt mode Temperature Register Status bits Critical Temp only mode Bit 15 Above Critical Trip Bit 14 Above Alarm Window Bit 13 Below Alarm Window (1) Tamb Ttrip(l) H L H 0 0 0 (2) Tamb < Ttrip(l) - Thys L L H 0 0 1 (3) Tamb > Ttrip(u) L L H 0 1 0 (4) Tamb Ttrip(u) - Thys H L H 0 0 0 (5) Tamb Tth(crit) L L L 1 1 0 (6) Tamb < Tth(crit) - Thys L H H 0 1 0 When Tamb Tth(crit) and Tamb < Tth(crit) - Thys the EVENT output is in Comparator mode and bit 0 of CONFIG (EVENT output mode) is ignored. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 9 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 7.3.2 EVENT thresholds 7.3.2.1 Alarm window The device provides a comparison window with an UPPER trip point and a LOWER trip point, programmed through the Upper Boundary Alarm Trip register (02h), and Lower Boundary Alarm Trip register (03h). The Upper Boundary Alarm Trip register holds the upper temperature trip point, while the Lower Boundary Alarm Trip register holds the lower temperature trip point as modified by hysteresis as programmed in the Configuration register. When enabled, the EVENT output triggers whenever entering or exiting (crossing above or below) the alarm window. * Advisory note: - NXP Device: The EVENT output can be cleared through the Clear EVENT bit (CEVNT) or SMBus ALERT. - Competitor Device: The EVENT output can be cleared only through the Clear EVENT bit (CEVNT). - Work-around: Only clear EVENT output using the Clear EVENT bit (CEVNT). - There will be no change to NXP devices. The Upper Boundary Alarm Trip should always be set above the Lower Boundary Alarm Trip. * Advisory note: - NXP device: Requires one conversion cycle (125 ms) after setting the alarm window before comparing the alarm limit with temperature register to ensure that there is correct data in the temperature register before comparing with the Alarm Window and operating EVENT output. - Competitor devices: Compares the alarm limit with temperature register at any time, so they get the EVENT output immediately when new UPPER or LOWER Alarm Windows and the EVENT output are set at the same time. - Work-around: Wait at least 125 ms before enabling EVENT output (EOCTL = 1). - SE97B will compare alarm window and temperature register immediately. 7.3.2.2 Critical trip The Tth(crit) temperature setting is programmed in the Critical Alarm Trip register (04h) as modified by hysteresis as programmed in the Configuration register. When the temperature reaches the critical temperature value in this register (and EVENT is enabled), the EVENT output asserts and cannot be de-asserted until the temperature drops below the critical temperature threshold. The Event cannot be cleared through the Clear EVENT bit (CEVNT) or SMBus ALERT. The Critical Alarm Trip should always be set above the Upper Boundary Alarm Trip. * Advisory note: - NXP device: Requires one conversion cycle (125 ms) after setting the Alarm Window before comparing the alarm limit with temperature register to ensure that there is correct data in the temperature register before comparing with the Alarm Window and operating EVENT output. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 10 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V - Competitor devices: Compares the Alarm Window with temperature register at any time, so they get the EVENT output immediately when new Tth(crit) and EVENT output are set at the same time. - Work-around: Wait at least 125 ms before enabling EVENT output (EOCTL = 1). Intel will change Nehalem BIOS so that Tth(crit) is set for more than 125 ms before EVENT output is enabled and Event value is checked. 1. Set Tth(crit). 2. Doing something else (make sure that exceeds 125 ms). 3. Enable the EVENT output (EOCTL = 1). 4. Wait 20 s. 5. Read Event value. - SE97B will compare alarm window and temperature register immediately. 7.3.3 EVENT operation modes 7.3.3.1 Comparator mode In comparator mode, the EVENT output behaves like a window-comparator output that asserts when the temperature is outside the window (e.g., above the value programmed in the Upper Boundary Alarm Trip register or below the value programmed in the Lower Boundary Alarm Trip register or above the Critical Alarm Trip resister if Tth(crit) only is selected). Reads/writes on the registers do not affect the EVENT output in comparator mode. The EVENT signal remains asserted until the temperature goes inside the alarm window or the window thresholds are reprogrammed so that the current temperature is within the alarm window. The comparator mode is useful for thermostat-type applications, such as turning on a cooling fan or triggering a system shutdown when the temperature exceeds a safe operating range. 7.3.3.2 Interrupt mode In interrupt mode, EVENT asserts whenever the temperature crosses an alarm window threshold. After such an event occurs, writing a 1 to the Clear EVENT bit (CEVNT) in the configuration register de-asserts the EVENT output until the next trigger condition occurs. In interrupt mode, EVENT asserts when the temperature crosses the alarm upper boundary. If the EVENT output is cleared and the temperature continues to increase until it crosses the critical temperature threshold, EVENT asserts again. Because the temperature is greater than the critical temperature threshold, a Clear EVENT command does not clear the EVENT output. Once the temperature drops below the critical temperature, EVENT de-asserts immediately. * Advisory note: - NXP device: If the EVENT output is not cleared before the temperature goes above the critical temperature threshold EVENT de-asserts immediately when temperature drops below the critical temperature. - Competitor devices: If the EVENT output is not cleared before or when the temperature is in the critical temperature threshold, EVENT will remain asserted after the temperature drops below the critical temperature until a Clear EVENT command. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 11 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V - Work-around: Always clear the EVENT output before temperature exceeds the critical temperature. - SE97B will keep EVENT asserted after the temperature drops below the critical temperature until a Clear EVENT command de-asserts EVENT. 7.4 Conversion rate The conversion time is the amount of time required for the ADC to complete a temperature measurement for the local temperature sensor. The conversion rate is the inverse of the conversion period which describes the number of cycles the temperature measurement completes in one second--the faster the conversion rate, the faster the temperature reading is updated. The SE97's conversion rate is at least 8 Hz or 125 ms. 7.4.1 What temperature is read when conversion is in progress The SE97 has been designed to ensure a valid temperature is always available. When a read to the temperature register is initiated through the SMBus, the device checks to see if the temperature conversion process (Analog-to-Digital conversion) is complete and a new temperature is available: * If the temperature conversion process is complete, then the new temperature value is sent out on the SMBus. * If the temperature conversion process in not complete, then the previous temperature value is sent out on the SMBus. It is possible that while SMBus Master is reading the temperature register, a new temperature conversion completes. However, this will not affect the data (MSB or LSB) that is being shifted out. On the next read of the temperature register, the new temperature value will be shifted out. 7.5 Power-up default condition After power-on, the SE97 is initialized to the following default condition: * * * * * Starts monitoring local sensor EVENT register is cleared; EVENT output is pulled HIGH by external pull-ups EVENT hysteresis is defaulted to 0 C Command pointer is defaulted to `00h' Critical Temp, Alarm Temperature Upper and Lower Boundary Trip register are defaulted to 0 C * Capability register is defaulted to `0017h' for the B grade * Operational mode: comparator * SMBus register is defaulted to `00h' 7.6 Device initialization SE97 temperature sensors have programmable registers, which, upon power-up, default to zero. The open-drain EVENT output is default to being disabled, comparator mode and active LOW. The alarm trigger registers default to being unprotected. The configuration registers, upper and lower alarm boundary registers and critical temperature window are defaulted to zero and need to be programmed to the desired values. SMBus TIMEOUT SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 12 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V feature defaults to being enabled and can be programmed to disable. These registers are required to be initialized before the device can properly function. Except for the SPD, which does not have any programmable registers, and does not need to be initialized. Table 4 shows the default values and the example value to be programmed to these registers. Table 4. Registers to be initialized Register Default value Example value Description 01h 0000h 0209h Configuration register * * * hysteresis = 1.5 C EVENT output = Interrupt mode EVENT output is enabled 02h 0000h 0550h Upper Boundary Alarm Trip register = 85 C 03h 0000h 1F40h Lower Boundary Alarm Trip register = -20 C 04h 0000h 05F0h Critical Alarm Trip register = 95 C 22h 0000h 0000h SMBus register = no change 7.7 SMBus time-out The SE97 supports SMBus time-out feature. If the host holds SCL LOW between 25 ms and 35 ms, the SE97 would reset its internal state machine to the bus IDLE state to prevent the system bus hang-up. This feature is turned on by default. The SMBus time-out is disabled by writing a `1' to bit 7 of register 22h. Remark: When SMBus time-out is enabled, the I2C-bus minimum bus speed is limited by the SMBus time-out specification limit of 10 kHz. The SE97 has no SCL driver, so it cannot hold the SCL line LOW. Remark: SMBus time-out works over the entire supply range of 1.7 V to 3.6 V unless the shutdown bit (SHMD) is set and turns off the oscillator. 7.8 SMBus ALERT Response Address (ARA) The SE97 supports SMBus ALERT when it is programmed for the Interrupt mode and when the EVENT polarity bit is set to `0'. The EVENT pin can be ANDed with other EVENT or interrupt signals from other slave devices to signal their intention to communicate with the host controller. When the host detects EVENT or other interrupt signal LOW, it issues an ARA to which a slave device would respond with its address. When there are multiple slave devices generating an ALERT the SE97 performs bus arbitration with the other slaves. If it wins the bus, it responds to the ARA and then clears the EVENT pin. Remark: Either in comparator mode or when the SE97 crosses the critical temperature, the host must also read the EVENT status bit and provide remedy to the situation by bringing the temperature to within the alarm window or below the critical temperature if that bit is set. Otherwise, the EVENT pin will not get de-asserted. Remark: In the SE97 the ARA is set to default ON. However, in the SE97B the ARA will be set to default OFF since ARA is not anticipated to be used in DDR3 DIMM applications. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 13 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V read START bit S 0 0 host detects SMBus ALERT Fig 9. acknowledge no acknowledge Alert Response Address 0 1 1 0 STOP bit device address 0 1 0 0 master sends a START bit, ARA and a read command 0 1 1 A2 A1 A0 Slave acknowledges and sends its slave address. The last bit of slave address is hard coded '0'. 0 1 P host NACK and sends a STOP bit 002aac685 How SE97 responds to SMBus ALERT Response Address 7.9 SMBus/I2C-bus interface The data registers in this device are selected by the Pointer register. At power-up, the Pointer register is set to `00h', the location for the Capability register. The Pointer register latches the last location to which it was set. Each data register falls into one of three types of user accessibility: * Read only * Write only * Write/Read same address A `write' to this device will always include the address byte and the pointer byte. A write to any register other than the Pointer register requires two data bytes. Reading this device can take place either of two ways: * If the location latched in the Pointer register is correct (most of the time it is expected that the Pointer register will point to one of the Temperature register (as it will be the data most frequently read), then the read can simply consist of an address byte, followed by retrieving the two data bytes. * If the Pointer register needs to be set, then an address byte, pointer byte, repeat START, and another address byte will accomplish a read. The data byte has the most significant bit first. At the end of a read, this device can accept either Acknowledge (ACK) or No Acknowledge (NACK) from the Master (No Acknowledge is typically used as a signal for the slave that the Master has read its last byte). It takes this device 125 ms to measure the temperature. Refer to timing diagrams Figure 10 to Figure 13 for how to program the device. 1 2 3 4 5 6 7 A6 A5 A4 A3 A2 A1 A0 8 9 W A 1 2 3 4 5 6 7 8 D7 D6 D5 D4 D3 D2 D1 D0 9 SCL SDA S START device address and write ACK by device A register address P ACK STOP by device 002aab308 A = ACK = Acknowledge bit. W = Write bit = 0. R = Read bit = 1. Fig 10. SMBus/I2C-bus write to the Pointer register SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 14 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 (cont.) SCL A6 SDA A5 A4 A3 A2 A1 D7 A0 S W device address and write START by host 1 2 3 4 5 6 7 D15 D14 D13 D12 D11 D10 D9 D6 D5 D4 D3 D2 D1 (cont.) D0 A A ACK by device 8 9 1 write register address 2 3 4 5 6 7 D6 D5 D4 D3 D2 D1 ACK by device 8 9 SCL SDA D7 D8 D0 A by host A ACK by device most significant byte data P ACK STOP by device by host least significant byte data 002aab412 A = ACK = Acknowledge bit. W = Write bit = 0. R = Read bit = 1. Fig 11. SMBus/I2C-bus write to the Pointer register followed by a write data word 1 2 3 4 5 6 7 8 9 1 2 3 4 5 6 7 8 9 (cont.) SCL A6 SDA A5 A4 A3 A2 A1 A0 S D7 W device address and write START by host 1 2 3 4 5 D6 D5 7 8 D3 D2 D1 (cont.) D0 A read register address ACK by device 6 D4 A ACK by device 9 (cont.) SCL A6 SDA A5 A4 A3 A2 A1 repeated START by host (cont.) A0 SR R device address and read A ACK by device 1 2 3 4 5 6 7 8 D15 D14 D13 D12 D11 D10 D9 D8 9 1 2 3 4 5 6 7 8 D7 D6 D5 D4 D3 D2 D1 D0 9 SCL SDA A returned most significant byte data ACK by host A returned least significant byte data P NACK STOP by host by host 002aac686 A = ACK = Acknowledge bit. A = NACK = No Acknowledge bit. W = Write bit = 0. R = Read bit = 1. Fig 12. SMBus/I2C-bus write to Pointer register followed by a repeated START and an immediate data word read SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 15 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 1 2 3 4 5 6 7 8 9 (cont.) SCL A6 SDA A5 A4 A3 A2 A1 (cont.) A0 R S device address and read START by host A ACK by device 1 2 3 4 5 6 7 8 D15 D14 D13 D12 D11 D10 D9 D8 9 1 2 3 4 5 6 7 8 D7 D6 D5 D4 D3 D2 D1 D0 9 SCL SDA A returned most significant byte data ACK by host A returned least significant byte data P NACK STOP by host 002aac687 A = ACK = Acknowledge bit. A = NACK = No Acknowledge bit. W = Write bit = 0. R = Read bit = 1. Fig 13. SMBus/I2C-bus word read from register with a pre-set pointer SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 16 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 7.10 EEPROM operation The 2-kbit EEPROM is organized as either 256 bytes of 8 bits each (byte mode), or 16 pages of 16 bytes each (page mode). Accessing the EEPROM in byte mode or page mode is automatic; partial page write of 2 bytes, 4 bytes, or 8 bytes is also supported. Communication with the EEPROM is via the 2-wire serial I2C-bus or SMBus. Figure 14 provides an overview of the EEPROM partitioning. 00h 01h ... 07h FFh no write protect 80h 7Fh 16 pages or 256 bytes write protect by software 8 pages or 128 bytes 0Fh 1 page or 16 bytes 00h 002aac812 Fig 14. EEPROM partitioning The EEPROM can be read over voltage range 1.7 V to 3.6 V, but all write operations must be done 3.0 V to 3.6 V. 7.10.1 Write operations 7.10.1.1 Byte Write In Byte Write mode the master creates a START condition and then broadcasts the slave address, byte address, and data to be written. The slave acknowledges all 3 bytes by pulling down the SDA line during the ninth clock cycle following each byte. The master creates a STOP condition after the last ACK from the slave, which then starts the internal write operation (see Figure 15). During internal write, the slave will ignore any read/write request from the master. slave address (memory) SDA S 1 0 1 START condition 0 A2 A1 A0 word address 0 data A A R/W acknowledge from slave acknowledge from slave DATA A P acknowledge from slave STOP condition; write to the memory is performed 002aab246 Fig 15. Byte Write timing SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 17 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 7.10.1.2 Page Write The SE97 contains 256 bytes of data, arranged in 16 pages of 16 bytes each. The page is selected by the four Most Significant Bits (MSB) of the address byte presented to the device after the slave address, while the four Least Significant Bits (LSB) point to the byte within the page. By loading more than one data byte into the device, up to an entire page can be written in one write cycle (see Figure 16). The internal byte address counter will increment automatically after each data byte. If the master transmits more than 16 data bytes, then earlier bytes will be overwritten by later bytes in a wrap-around fashion within the selected page. The internal write cycle is started following the STOP condition created by the master. slave address (memory) SDA S 1 0 1 START condition 0 A2 A1 A0 word address 0 data to memory A A R/W acknowledge from slave A DATA n acknowledge from slave acknowledge from slave data to memory DATA n + 15 A P acknowledge from slave STOP condition; write to the memory is performed 002aab247 Fig 16. Page Write timing 7.10.1.3 Acknowledge polling Acknowledge polling can be used to determine if the SE97 is busy writing or is ready to accept commands. Polling is implemented by sending a `Selective Read' command (described in Section 7.10.3 "Read operations") to the device. The SE97 will not acknowledge the slave address as long as internal write is in progress. 7.10.2 Memory protection The lower half (the first 128 bytes) of the memory can be write protected by special EEPROM commands without an external control pin. The SE97 features three types of memory write protection instructions, and three respective read Protection instructions. The level of write-protection (set or clear) that has been defined using these instructions remained defined even after power cycle. The memory protection commands are: * * * * * * Permanent Write Protection (PWP) Reversible Write Protection (RWP) Clear Write Protection (CWP) Read Permanent Write Protection (RPWP) Read Reversible Write Protection (RRWP) Read Clear Write Protection (RCWP) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 18 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Table 5 is the summary for normal and memory protection instructions. Table 5. EEPROM commands summary Command Fixed address Normal EEPROM read/write Reversible Write Protection (RWP) Hardware selectable address R/W Bit 0 Bit 7[1] Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 1 0 1 0 A2 A1 A0 0 1 1 0 VSS VSS R/W VI(ov) [3] [3] 0 Clear Reversible Write Protection (CRWP) 0 1 1 0 VSS VDD VI(ov) Permanent Write Protection (PWP)[2] 0 1 1 0 A2 A1 A0 Read RWP 0 1 1 0 VSS VSS VI(ov)[3] 1 [3] 1 Read CRWP 0 1 1 0 VSS VDD VI(ov) Read PWP 0 1 1 0 A2 A1 A0 [1] The most significant bit, bit 7, is sent first. [2] A0, A1, and A2 are compared against the respective external pins on the SE97. [3] VI(ov) ranges from 7.8 V to 10 V. 0 0 1 This special EEPROM command consists of a unique 4-bit fixed address (0110b) and the voltage level applied on the 3-bit hardware address. Normally, to address the memory array, the 4-bit fixed address is `1010b'. To access the memory protection settings, the 4-bit fixed address is `0110b'. Figure 17 and Figure 18 show the write and read protection sequence, respectively. Up to eight memory devices can be connected on a single I2C-bus. Each one is given a 3-bit on the hardware selectable address (A2, A1, A0) inputs. The device only responds when the 4-bit fixed and hardware selectable bits are matched. The 8th bit is the read/write bit. This bit is set to 1 or 0 for read and write protection, respectively. The corresponding device acknowledges during the ninth bit time when there is a match on the 7-bit address. The device does not acknowledge when there is no match on the 7-bit address or when the device is already in permanent write protection mode and is programmed with any write protection instructions (i.e., PWP, RWP, CWP). slave address (memory) SDA S 0 1 1 0 A2 A1 A0 START condition dummy byte address 0 A X X X R/W acknowledge(1) from slave X X X X dummy data X A acknowledge(1) from slave X X X X X X X X A P acknowledge(1) from slave STOP condition 002aab356 X = Don't Care (1) Refer to Table 6 regarding the exact state of the acknowledge bit. Fig 17. Software Write Protect (write) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 19 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V slave address (memory) SDA S 0 1 1 0 A2 A1 A0 START condition dummy byte address 1 A X X X X R/W acknowledge(1) from slave X X X dummy data X A X X X X no acknowledge(1) from slave X X X X A P no acknowledge(1) from slave STOP condition 002aac644 X = Don't Care (1) Refer to Table 7 regarding the exact state of the acknowledge bit. Fig 18. Software Write Protect (read) 7.10.2.1 Permanent Write Protection (PWP) If the software write-protection has been set with the PWP instruction, the first 128 bytes of the memory are permanently write-protected. This write-protection cannot be cleared by any instruction, or by power-cycling the device. Also, once the PWP instruction has been successfully executed, the device no longer acknowledges any instruction (with 4-bit fixed address of 0110b) to access the write-protection settings. 7.10.2.2 Reversible Write Protection (RWP) and Clear Reversible Write Protection (CRWP) If the software write-protection has been set with the RWP instruction, it can be cleared again with a CRWP instruction. The two instructions, RWP and CRWP have the same format as a Byte Write instruction, but with a different setting for the hardware address pins (as shown in Table 5). Like the Byte Write instruction, it is followed by an address byte and a data byte, but in this case the contents are all `Don't Care' (Figure 17). Another difference is that the voltage, VI(ov), must be applied on the A0 pin, and specific logical levels must be applied on the other two (A1 and A2), as shown in Table 5. Table 6. Acknowledge when writing data or defining write protection Instructions with R/W bit = 0. Status Instruction ACK Address ACK Data byte ACK Write cycle (Tcy(W)) Permanently protected PWP, RWP or CRWP NACK not significant NACK not significant NACK no page or byte write in lower 128 bytes ACK address ACK data NACK no Protected with RWP RWP NACK not significant NACK not significant NACK no CRWP ACK not significant ACK not significant ACK yes PWP ACK not significant ACK not significant ACK yes page or byte write in lower 128 bytes ACK address ACK data NACK no PWP or RWP ACK not significant ACK not significant ACK yes CRWP ACK not significant ACK not significant ACK no page or byte write ACK address ACK data ACK yes Not protected SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 20 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 7.10.2.3 Read Permanent Write Protection (RPWP), Read Reversible Write Protection (RRWP), and Read Clear Reversible Write Protection (RCRWP) Read PWP, RWP, and CRWP allow the SE97 to be read in write protection mode. The instruction format is the same as that of the write protection except that the 8th bit, R/W, is set to 1. Figure 18 shows the instruction format, while Table 7 shows the responses when the instructions are issued. Table 7. Acknowledge when reading the write protection Instructions with R/W bit = 1. Status Instruction ACK Address ACK Data byte ACK Permanently protected RPWP, RRWP or RCRWP NACK not significant NACK not significant NACK Protected with RWP RRWP NACK not significant NACK not significant NACK RCRWP ACK not significant NACK not significant NACK RPWP ACK not significant NACK not significant NACK RPWP, RRWP or RCRWP ACK not significant NACK not significant NACK Not protected 7.10.3 Read operations 7.10.3.1 Current address read In Standby mode, the SE97 internal address counter points to the data byte immediately following the last byte accessed by a previous operation. If the `previous' byte was the last byte in memory, then the address counter will point to the first memory byte, and so on. If the SE97 decodes a slave address with a `1' in the R/W bit position (Figure 19), it will issue an Acknowledge in the ninth clock cycle and will then transmit the data byte being pointed at by the address counter. The master can then stop further transmission by issuing a No Acknowledge on the ninth bit then followed by a STOP condition. slave address (memory) SDA S 1 0 1 0 A2 A1 A0 START condition data from memory 1 A R/W acknowledge from slave A P no acknowledge from master STOP condition 002aab251 Fig 19. Current address read timing 7.10.3.2 Selective read The read operation can also be started at an address different from the one stored in the address counter. The address counter can be `initialized' by performing a `dummy' write operation (Figure 20). The START condition is followed by the slave address (with the R/W bit set to `0') and the desired byte address. Instead of following-up with data, the master then issues a second START, followed by the `Current Address Read' sequence, as described in Section 7.10.3.1. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 21 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V slave address (memory) SDA S 1 0 1 0 word address A2 A1 A0 START condition 0 A A R/W acknowledge from slave data from memory slave address (memory) S 1 0 1 0 acknowledge from slave A2 A1 A0 START condition 1 A A R/W acknowledge from slave P no acknowledge from master STOP condition 002aac901 Fig 20. Selective read timing 7.10.3.3 Sequential read If the master acknowledges the first data byte transmitted by the SE97, then the device will continue transmitting as long as each data byte is acknowledged by the master (Figure 21). If the end of memory is reached during sequential Read, the address counter will `wrap around' to the beginning of memory, and so on. Sequential Read works with either `Immediate Address Read' or `Selective Read', the only difference being the starting byte address. slave address (memory) SDA S 1 0 1 0 A2 A1 A0 START condition data from memory 1 A DATA n R/W acknowledge from slave data from memory A DATA n + 1 acknowledge from master A acknowledge from master data from memory DATA n + X A P no acknowledge from master STOP condition 002aab253 Fig 21. Sequential read timing SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 22 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 7.11 Hot plugging The SE97 can be used in hot plugging applications. Internal circuitry prevents damaging current backflow through the device when it is powered down, but with the I2C-bus, EVENT or address pins still connected. The open-drain SDA and EVENT pins (SCL and address pins are input only) effectively places the outputs in a high-impedance state during power-up and power-down, which prevents driver conflict and bus contention. The 50 ns noise filter will filter out any insertion glitches from the state machine, which is very robust and not prone to false operation. The device needs a proper power-up sequence to reset itself, not only for the device I2C-bus and I/O initial states, but also to load specific pre-defined data or calibration data into its operational registers. The power-up sequence should occur correctly with a fast ramp rate and the I2C-bus active. The SE97 might not respond immediately after power-up, but it should not damage the part if the power-up sequence is abnormal. If the SCL line is held LOW, the part will not exit the power-on reset mode since the part is held in reset until SCL is released. 8. Register descriptions 8.1 Register overview This section describes all the registers used in the SE97. The registers are used for latching the temperature reading, storing the low and high temperature limits, configuring, the hysteresis threshold and the ADC, as well as reporting status. The device uses the pointer register to access these registers. Read registers, as the name implies, are used for read only, and the write registers are for write only. Any attempt to read from a write-only register will result in reading `0's. Writing to a read-only register will have no effect on the read even though the write command is acknowledged. The Pointer register is an 8-bit register. All other registers are 16-bit. Table 8. Register summary Address (hex) Default state (hex) Register name n/a n/a Pointer register 00h 0017h Capability register (B grade = 0017h) 01h 0000h Configuration register 02h 0000h Upper Boundary Alarm Trip register 03h 0000h Lower Boundary Alarm Trip register 04h 0000h Critical Alarm Trip register 05h n/a Temperature register 06h 1131h Manufacturer ID register 07h A200h Device ID/Revision register for SE97PW, SE97TK A201h Device ID/Revision register for SE97TP, SE97TL 08h to 21h 0000h reserved registers 22h 0000h SMBus register 23h to FFh 0000h reserved registers A write to reserved registers my cause unexpected results which may result in requiring a reset by removing and re-applying its power. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 23 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.2 Capability register (00h, 16-bit read-only) Table 9. Capability register (address 00h) bit allocation Bit 15 14 13 12 Symbol 11 10 9 8 RFU Default 0 0 0 0 0 0 0 0 Access R R R R R R R R Bit 7 6 5 4 3 2 1 0 WRNG HACC BCAP Symbol RFU VHV Default 0 0 0[1] Access R R R [1] TRES 1 0 1 1 1 R R R R R The SE97 A0 pin can support up to 10 V, but the final die was already taped out before the JC42.4 ballot 1435.00 register change could be implemented. Bit 5 is changed from `0' to `1' on the future 1.7 V to 3.6 V SE97B. Table 10. Capability register (address 00h) bit description Bit Symbol Description 15:6 RFU Reserved for future use; must be zero. 5 VHV High voltage standoff for pin A0. 0 -- default 1 -- This part can support a voltage up to 10 V on the A0 pin to support JC42.4 ballot 1435.00. 4:3 TRES Temperature resolution. 2 WRNG Wider range. 10 -- 0.125 C LSB (11-bit) 1 -- can read temperatures below 0 C and set sign bit accordingly 1 HACC Higher accuracy (set during manufacture). 1 -- B grade accuracy 0 BCAP Basic capability. 1 -- has Alarm and Critical Trips interrupt capability SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 24 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.3 Configuration register (01h, 16-bit read/write) Table 11. Configuration register (address 01h) bit allocation Bit 15 14 13 Symbol 12 11 10 RFU 9 HEN 8 SHMD Default 0 0 0 0 0 0 0 0 Access R R R R R R/W R/W R/W Bit 7 6 5 4 3 2 1 0 Symbol CTLB AWLB CEVNT ESTAT EOCTL CVO EP EMD Default 0 0 0 0 0 0 0 0 Access R/W R/W R/W R/W R/W R/W R/W R/W Table 12. Bit Configuration register (address 01h) bit description Symbol Description 15:11 RFU reserved for future use; must be `0'. 10:9 Hysteresis Enable. HEN 00 -- disable hysteresis (default) 01 -- enable hysteresis at 1.5 C 10 -- enable hysteresis at 3 C 11 -- enable hysteresis at 6 C When enabled, hysteresis is applied to temperature movement around trigger points. For example, consider the behavior of the `Above Alarm Window' bit (bit 14 of the Temperature register) when the hysteresis is set to 3 C. As the temperature rises, bit 14 will be set to `1' (temperature is above the alarm window) when the Temperature register contains a value that is greater than the value in the Alarm Temperature Upper Boundary register. If the temperature decreases, bit 14 will remain set until the measured temperature is less than or equal to the value in the Alarm Temperature Upper Boundary register minus 3 C. (Refer to Figure 8 and Table 13). Similarly, the `Below Alarm Window' bit (bit 13 of the Temperature register) will be set to `0' (temperature is equal to or above the Alarm Window Lower Boundary Trip register) when the value in the Temperature register is equal to or greater than the value in the Alarm Temperature Lower Boundary register. As the temperature decreases, bit 13 will be set to `1' when the value in the Temperature register is equal to or less than the value in the Alarm Temperature Lower Boundary register minus 3 C. Note that hysteresis is also applied to EVENT pin functionality. When either of the Critical Trip or Alarm Window lock bits is set, these bits cannot be altered until unlocked. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 25 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Table 12. Configuration register (address 01h) bit description ...continued Bit Symbol Description 8 SHMD Shutdown Mode. 0 -- enabled Temperature Sensor (default) 1 -- disabled Temperature Sensor When shut down, the thermal sensor diode and ADC are disabled to save power, no events will be generated. When either of the Critical Trip or Alarm Window lock bits is set, this bit cannot be set until unlocked. However, it can be cleared at any time. Remark: SMBus Time-out works over the entire supply range of 1.7 V to 3.6 V unless the shutdown bit (SHMD) is set and turns off the oscillator. * The EEPROM read works over the entire supply range of 1.7 V to 3.6 V whether or not SHMD is set because it does not need oscillator to function. There is no undervoltage lockout, the device no longer responds at some voltage below 1.7 V. * EEPROM write works over the supply range of 3.0 V to 3.6 V, but not if SHMD is set since the oscillator is needed to write to EEPROM. There is an undervoltage lockout around 2.7 V that disables the RRPROM write operation. * Thermal sensor is operational over the supply range of 3.0 V to 3.6 V, but not if SHMD is set since the oscillator is needed. There is an undervoltage lockout around 2.7 V that disables the temp sensor. Thermal sensor auto turn-off feature: It was determined during testing of the SE97TP on 5 May 2008 that the Thermal Sensor auto turn-off feature was not compatible with the JEDEC power supply maximum ramp rate of 70 ms to 100 ms (slowest ramp rate) and this feature was disabled for all SE97 samples/production devices tested after 6 May (wk 0818 date code is when the devices were assembled). If there is a slow ramp rate on the supply voltage to 3.3 V the SE97 would be EE read only and not Thermal Sensor. This is due to a feature integrated into the device to automatically turn off the oscillator and place the thermal sensor in shutdown if the SE97 was being used in SO-DIMM in notebook applications at 1.8 V to reduce the power consumption on the battery. The feature counts for 30 ms ( 5 ms) after the oscillator starts working (around 1.2 V to 1.7 V) and if at 30 ms the voltage is greater than 2.4 V, the oscillator is left on and the Thermal Sensor functions as normal. But if the voltage is less than 2.4 V at 30 ms, the oscillator is turned off and the SE97 will think the part is in SPD only mode defaulting to the oscillator and Thermal Sensor disabled (SHMD Shutdown Mode bit 8 = 1). The oscillator and Thermal Sensor can be re-enabled by writing a logic 0 to SHMD. It is important in RDIMM/server applications that the Thermal Sensor is working as the default condition since the Thermal Sensor needs to be compatible with the JEDEC power supply ramp rate (maximum ramp rate is 70 ms to 100 ms) so the Thermal Sensor auto turn-off feature was disabled starting on 6 May 2008 by changing a programmable bit on the device during final test. There is no change in performance of the SE97 with this feature turned off and was verified during characterization. There is no way to read the SE97 registers via the I2C-bus to determine if the Thermal Sensor auto turn-off feature is enabled or disabled. This is set in a factory only register. You need to check the date code or do an operational test (e.g., run up to < 2.4 V, hold, then go to 3.3 V, then read SHMD bit 8 in the Configuration register to see if it is set to logic 0 (e.g., oscillator running = feature disabled) or logic 1 (e.g., oscillator turned off = feature enabled)). The Thermal Sensor auto turn-off feature is active in all package options prior to wk 0818. The SE97TP and SE97TL were not yet released to production so there is a clear line at release/orderable devices versus samples with this feature disabled in all production devices. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 26 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Table 12. Configuration register (address 01h) bit description ...continued Bit Symbol Description 7 CTLB Critical Trip Lock bit. 0 -- Critical Alarm Trip register is not locked and can be altered (default) 1 -- Critical Alarm Trip register settings cannot be altered This bit is initially cleared. When set, this bit will return a `1', and remains locked until cleared by internal Power-on reset. This bit can be written with a single write and do not require double writes. 6 AWLB Alarm Window Lock bit. 0 -- Upper and Lower Alarm Trip registers are not locked and can be altered (default) 1 -- Upper and Lower Alarm Trip registers setting cannot be altered This bit is initially cleared. When set, this bit will return a `1' and remains locked until cleared by internal power-on reset. This bit can be written with a single write and does not require double writes. 5 CEVNT Clear EVENT (write only). 0 -- no effect (default) 1 -- clears active EVENT in Interrupt mode. Writing to this register has no effect in Comparator mode. When read, this register always returns zero. 4 ESTAT EVENT Status (read only). 0 -- EVENT output condition is not being asserted by this device (default) 1 -- EVENT output pin is being asserted by this device due to Alarm Window or Critical Trip condition The actual event causing the EVENT can be determined from the Read Temperature register. Interrupt Events can be cleared by writing to the `Clear EVENT' bit (CEVNT). Writing to this bit will have no effect. 3 EOCTL EVENT Output Control. 0 -- EVENT output disabled (default) 1 -- EVENT output enabled When either of the Critical Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked. 2 CVO Critical Event Only. 0 -- EVENT output on Alarm or Critical temperature event (default) 1 -- EVENT only if temperature is above the value in the critical temperature register When the Critical Trip or Alarm Window lock bit is set, this bit cannot be altered until unlocked. * Advisory note: - JEDEC specification requires only the Alarm Window lock bit to be set. - Work-around: Clear both Critical Trip and Alarm Window lock bits. - Future 1.7 V to 3.6 V SE97B will require only the Alarm Window lock bit to be set. 1 EP EVENT Polarity. 0 -- active LOW (default) 1 -- active HIGH. When either of the Critical Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 27 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Table 12. Configuration register (address 01h) bit description ...continued Bit Symbol Description 0 EMD EVENT Mode. 0 -- comparator output mode (default) 1 -- interrupt mode When either of the Critical Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked. Table 13. Action Hysteresis enable Below Alarm Window bit (bit 13) Above Alarm Window bit (bit 14) Above Critical Trip bit (bit 15) Temperature slope Threshold temperature Temperature slope Threshold temperature Temperature slope Threshold temperature sets falling Ttrip(l) - Thys rising Ttrip(u) rising Tth(crit) clears rising Ttrip(l) falling Ttrip(u) - Thys falling Tth(crit) - Thys current temperature temperature critical alarm threshold hysteresis upper alarm threshold hysteresis lower alarm threshold hysteresis time Above Critical Trip (register 05h; bit 15 = ACT bit) clear set clear Above Alarm Window (register 05h; bit 14 = AAW bit) clear set clear Below Alarm Window (register 05h; bit 13 = BAW bit) set clear 002aac799 Fig 22. Hysteresis: how it works SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 28 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.4 Temperature format The temperature data from the temperature read back register is an 11-bit 2's complement word with the least significant bit (LSB) equal to 0.125 C (resolution). * A value of 019Ch will represent 25.75 C * A value of 07C0h will represent 124 C * A value of 1E64h will represent -25.75 C. The unused LSB (bit 0) is set to `0'. Bit 11 will have a resolution of 128 C. The upper 3 bits of the temperature register indicate Trip Status based on the current temperature, and are not affected by the status of the EVENT output. Table 14 lists the examples of the content of the temperature data register for positive and negative temperature for two scenarios of status bits: status bits = 000b and status bits = 111b. Table 14. Degree Celsius and Temperature Data register Temperature Content of Temperature Data register Status bits = 000b Status bits = 111b Binary Hex Binary Hex +125 C 000 0 01111101 000 0 07D0h 111 0 01111101 000 0 E7D0h +25 C 000 0 00011001 000 0 0190h 111 0 00011001 000 0 E190h +1 C 000 0 00000001 000 0 0010h 111 0 00000001 000 0 E010h +0.25 C 000 0 00000000 010 0 0004h 111 0 00000000 010 0 E004h +0.125 C 000 0 00000000 001 0 0002h 111 0 00000000 001 0 E002h 0 C 000 0 00000000 000 0 0000h 111 0 00000000 000 0 E000h -0.125 C 000 1 11111111 111 0 1FFEh 111 1 11111111 111 0 FFFEh -0.25 C 000 1 11111111 110 0 1FFCh 111 1 11111111 110 0 FFFCh -1 C 000 1 11111111 000 0 1FF0h 111 1 11111111 000 0 FFF0h -20 C 000 1 11110100 000 0 1F40h 111 1 11110100 000 0 FF40h -25 C 000 1 11100111 000 0 1E70h 111 1 11100111 000 0 FE70h -55 C 000 1 11001001 000 0 1C90h 111 1 11001001 000 0 FC90h SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 29 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.5 Temperature Trip Point registers 8.5.1 Upper Boundary Alarm Trip register (16-bit read/write) The value is the upper threshold temperature value for Alarm mode. The data format is 2's complement with bit 2 = 0.25 C. `RFU' bits will always report zero. Interrupts will respond to the presently programmed boundary values. If boundary values are being altered in-system, it is advised to turn off interrupts until a known state can be obtained to avoid superfluous interrupt activity. Table 15. Bit Upper Boundary Alarm Trip register bit allocation 15 Symbol 14 13 12 RFU 10 SIGN 9 8 UBT Default 0 0 0 0 0 0 0 0 Access R R R R/W R/W R/W R/W R/W Bit 7 6 5 4 3 2 1 0 Symbol UBT RFU Default 0 0 0 0 0 0 0 0 Access R/W R/W R/W R/W R/W R/W R R Table 16. Upper Boundary Alarm Trip register bit description Bit Symbol Description 15:13 RFU reserved; always `0' 12 SIGN Sign (MSB) 11:2 UBT Upper Boundary Alarm Trip Temperature (LSB = 0.25 C) 1:0 RFU reserved; always `0' SE97_7 Product data sheet 11 (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 30 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.5.2 Lower Boundary Alarm Trip register (16-bit read/write) The value is the lower threshold temperature value for Alarm mode. The data format is 2's complement with bit 2 = 0.25 C. RFU bits will always report zero. Interrupts will respond to the presently programmed boundary values. If boundary values are being altered in-system, it is advised to turn off interrupts until a known state can be obtained to avoid superfluous interrupt activity. Table 17. Lower Boundary Alarm Trip register bit allocation Bit 15 Symbol 14 13 12 RFU 11 10 SIGN 9 8 LBT Default 0 0 0 0 0 0 0 0 Access R R R R/W R/W R/W R/W R/W Bit 7 6 5 4 3 2 1 0 Default 0 0 0 0 0 0 0 0 Access R/W R/W R/W R/W R/W R/W R R Symbol LBT RFU Table 18. Lower Boundary Alarm Trip register bit description Bit Symbol Description 15:13 RFU reserved; always `0' 12 SIGN Sign (MSB) 11:2 LBT Lower Boundary Alarm Trip Temperature (LSB = 0.25 C) 1:0 RFU reserved; always `0' 8.5.3 Critical Alarm Trip register (16-bit read/write) The value is the critical temperature. The data format is 2's complement with bit 2 = 0.25 C. RFU bits will always report zero. Table 19. Lower Boundary Alarm Trip register bit allocation Bit 15 Symbol 14 13 12 RFU 10 SIGN 9 8 CT Default 0 0 0 0 0 0 0 0 Access R R R R/W R/W R/W R/W R/W Bit 7 6 5 4 3 2 1 0 Symbol CT RFU Default 0 0 0 0 0 0 0 0 Access R/W R/W R/W R/W R/W R/W R R Table 20. Critical Alarm Trip register bit description Bit Symbol Description 15:13 RFU reserved; always `0' 12 SIGN Sign (MSB) 11:2 CT Critical Alarm Trip Temperature (LSB = 0.25 C) 1:0 RFU reserved; always `0' SE97_7 Product data sheet 11 (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 31 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.6 Temperature register (16-bit read-only) Table 21. Temperature register bit allocation Bit 15 14 13 12 Symbol ACT AAW BAW SIGN Default 0 0 0 0 0 Access R R R R Bit 7 6 5 4 Symbol 11 10 9 8 0 0 0 R R R R 3 2 1 0 TEMP TEMP RFU Default 0 0 0 0 0 0 0 0 Access R R R R R R R R Table 22. Temperature register bit description Bit Symbol Description 15 ACT Above Critical Trip. Increasing Tamb: 0 -- Tamb < Tth(crit) 1 -- Tamb Tth(crit) Decreasing Tamb: 0 -- Tamb < Tth(crit) - Thys 1 -- Tamb Tth(crit) - Thys 14 AAW Above Alarm Window. Increasing Tamb: 0 -- Tamb Ttrip(u) 1 -- Tamb > Ttrip(u) Decreasing Tamb: 0 -- Tamb Ttrip(u) - Thys 1 -- Tamb > Ttrip(u) - Thys 13 BAW Below Alarm Window. Increasing Tamb: 0 -- Tamb Ttrip(l) 1 -- Tamb < Ttrip(l) Decreasing Tamb: 0 -- Tamb Ttrip(l) - Thys 1 -- Tamb < Ttrip(l) - Thys 12 SIGN Sign bit. 0 -- positive temperature value 1 -- negative temperature value 11:1 TEMP Temperature Value (2's complement). (LSB = 0.125 C) 0 RFU reserved; always `0' SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 32 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.7 Manufacturer's ID register (16-bit read-only) The SE97 Manufacturer's ID register is intended to match NXP Semiconductors PCI SIG (1131h). Table 23. Bit Manufacturer's ID register bit allocation 15 14 13 10 9 8 Default 0 0 0 1 0 0 0 1 Access R R R R R R R R Bit 7 6 5 4 3 2 1 0 Default 0 0 1 1 0 0 0 1 Access R R R R R R R R 10 9 8 Symbol 12 11 Manufacturer ID Symbol (continued) 8.8 Device ID register The SE97 device ID is A2h. The device revision varies by device. Table 24. Bit Device ID register bit allocation 15 14 13 12 Default 1 0 1 0 0 0 1 0 Access R R R R R R R R Bit 7 6 5 4 3 2 1 0 Symbol 11 Device ID Symbol Device revision Default 0 0 0 0 0 0 [1] [1] Access R R R R R R R R [1] 00 for SE97PW, SE97TK (original) is 00h. 01 for SE97TL, SE97TP (improved VPOR and EVENT IOL) is 01h. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 33 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 8.9 SMBus register Table 25. SMBus Time-out register bit allocation Bit 15 14 13 12 Symbol 11 10 9 8 RFU Default 0 0 0 0 0 0 0 0 Access R R R R R R R R Bit 7 6 5 4 3 2 1 0 Symbol STMOUT Default 0 0 0 0 0 0 0 0 Access R/W R R R R R R R/W Table 26. RFU SALRT SMBus Time-out register bit description Bit Symbol Description 15:8 RFU reserved; always `0' 7 STMOUT SMBus time-out. 0 -- SMBus time-out is enabled (default) 1 -- disable SMBus time-out When either of the Critical Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked. 6:1 RFU reserved; always `0' 0 SALRT SMBus ALERT Response Address (ARA). 0 -- SMBus ARA is enabled (default) 1 -- disable SMBus ARA When either of the Critical Trip or Alarm Window lock bits is set, this bit cannot be altered until unlocked. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 34 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 9. Application design-in information In a typical application, the SE97 behaves as a slave device and interfaces to a bus master (or host) via the SCL and SDA lines. The EVENT output is monitored by the host, and asserts when the temperature reading exceeds the programmed values in the alarm registers. The A0, A1 and A2 pins are directly connected to VDD or VSS without any pull-up resistors. The SDA and SCL serial interface pins are open-drain I/Os that require pull-up resistors, and are able to sink a maximum of 3 mA with a voltage drop less than 0.4 V. Typical pull-up values for SCL and SDA are 10 k, but the resistor values can be changed in order to meet the rise time requirement if the capacitance load is too large due to routing, connectors, or multiple components sharing the same bus. 3.3 V slave master 10 k (3x) VDD SCL HOST CONTROLLER SDA SE97 EVENT A0 A1 A2 VSS 002aab354 Fig 23. Typical application showing SE97 interfacing with 3.3 V host mother board 3.3 V 1.1 V 0.1 F 0.1 F VDD 10 k 10 k SCL SE97 A0 A1 A2 0.1 F VCC(B) VCC(A) B2 A2 PCA9509 SDA B1 A1 EVENT 10 k 10 k SCL SDA HOST CONTROLLER EVENT EN VSS 002aad262 Fig 24. SE97 interfacing with 1.1 V host controller SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 35 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 9.1 SE97 in memory module application Figure 25 shows the SE97 being placed in the memory module application. The SE97 is centered in the memory module to monitor the temperature of the DRAM and also to provide a 2-kbit EEPROM as the Serial Presence Detect (SPD). In the event of overheating, the SE97 triggers the EVENT output and the memory controller throttles the memory bus to slow the DRAM. The memory controller can also read the SE97 and watch the DRAM thermal behavior, taking preventive measures when necessary. DIMM DRAM SE97 DRAM SMBus DRAM DRAM EVENT MEMORY CONTROLLER CPU 002aac800 Fig 25. System application 9.2 Layout consideration The SE97 does not require any additional components other than the host controller to read its temperature. It is recommended that a 0.1 F bypass capacitor between the VDD and VSS pins is located as close as possible to the power and ground pins for noise protection. 9.3 Thermal considerations In general, self-heating is the result of power consumption and not a concern, especially with the SE97, which consumes very low power. In the event the SDA and EVENT pins are heavily loaded with small pull-up resistor values, self-heating affects temperature accuracy by approximately 0.5 C. Equation 1 is the formula to calculate the effect of self-heating: T = R th ( j-a ) x [ ( V DD x I DD ( AV ) ) + ( V OL ( SDA ) x I OL ( sin k ) ( SDA ) ) + ( V OL ( EVENT ) x I OL ( sin k )EVENT ) ] (1) where: T = Tj - Tamb Tj = junction temperature Tamb = ambient temperature Rth(j-a) = package thermal resistance VDD = supply voltage IDD(AV) = average supply current SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 36 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V VOL(SDA) = LOW-level output voltage on pin SDA VOL(EVENT) = LOW-level output voltage on pin EVENT IOL(sink)(SDA) = SDA output current LOW IOL(sink)EVENT = EVENT output current LOW Calculation example: Tamb (typical temperature inside the notebook) = 50 C IDD(AV) = 400 A VDD = 3.6 V Maximum VOL(SDA) = 0.4 V IOL(sink)(SDA) = 1 mA VOL(EVENT) = 0.4 V IOL(sink)EVENT = 3 mA Rth(j-a) of HVSON8 = 56 C/W Rth(j-a) of TSSOP8 = 160 C/W Self heating due to power dissipation for HVSON8 is: T = 56 x [ ( 3.6 x 0.4 ) + ( 0.4 x 3 ) + ( 0.4 x 1 ) ] = 56 C W x 3.04 mW = 0.17 C (2) Self heating due to power dissipation for TSSOP8 is: T = 160 x [ ( 3.6 x 0.4 ) + ( 0.4 x 3 ) + ( 0.4 x 1 ) ] = 160 C W x 3.04 mV = 0.49 C (3) 10. Limiting values Table 27. Limiting values In accordance with the Absolute Maximum Rating System (IEC 60134). Symbol Parameter Conditions VDD supply voltage Max Unit -0.3 +4.2 V Vn voltage on any other pin SDA, SCL, EVENT pins -0.3 +4.2 V VA0 voltage on pin A0 overvoltage input; A0 pin -0.3 +12.5 V Isink sink current at SDA, SCL, EVENT pins -1 +50.0 mA Tj(max) maximum junction temperature - 150 C Tstg storage temperature -65 +165 C SE97_7 Product data sheet Min (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 37 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 11. Characteristics Table 28. SE97 thermal sensor characteristics VDD = 3.0 V to 3.6 V; Tamb = -40 C to +125 C; unless otherwise specified. Symbol Parameter Conditions Tlim(acc) temperature limit accuracy B grade; VDD = 3.3 V 10 % Min Typ Max Unit Tamb = 75 C to 95 C -1.0 < 0.5 +1.0 C Tamb = 40 C to 125 C -2.0 < 1.0 +2.0 C Tamb = -40 C to +125 C -3.0 < 2 +3.0 C - 0.125 - C Tres temperature resolution Tconv conversion period conversion time from STOP bit to conversion complete - 100 120 ms Ef(conv) conversion rate error percentage error in programmed data -30 - +30 % SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 38 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Table 29. DC characteristics VDD = 1.7 V to 3.6 V; Tamb = -40 C to +125 C; unless otherwise specified. These specifications are guaranteed by design. Symbol Parameter Conditions Min Typ Max Unit IDD(AV) average supply current SMBus inactive - 250 400 A Isd(VDD) supply voltage shutdown mode current SMBus inactive - 0.1 5.0 A VIH HIGH-level input voltage SCL, SDA; VDD = 3.0 V to 3.6 V 0.7 x VDD - VDD + 1 V VIL LOW-level input voltage SCL, SDA; VDD = 3.0 V to 3.6 V - - 0.3 x VDD V VOL1 LOW-level output voltage 1 VDD = 3.0 V; IOL = 3 mA - - 0.4 V VOL2 LOW-level output voltage 2 VDD = 1.7 V; IOL = 1.5 mA VI(ov) overvoltage input voltage pin A0; VI(ov) - VDD > 4.8 V VPOR power-on reset voltage power supply rising [1] - - 0.5 V 7.8 - 10 V - - 1.7 V power supply falling SE97PW, SE97TK 0.1 - - V SE97TL, SE97TP 0.6 - - V SE97PW, SE97TK 2 - - mA SE97TL, SE97TP IOL(sink)EVENT LOW-level output sink current on pin EVENT VOL1 = 0.4 V 6 - - mA IOL(sink)(SDA) LOW-level output sink current on pin SDA VOL2 = 0.5 V 3 - - mA ILOH HIGH-level output leakage current EVENT; VOH = VDD -1.0 - +1.0 A ILIH HIGH-level input leakage current SDA, SCL; VI = VDD -1.0 - +1.0 A ILIL LOW-level input leakage current SDA, SCL; VI = VSS -1.0 - +1.0 A A0, A1, A2; VI = VSS -1.0 - +1.0 A - 5 10 pF Ci(SCL/SDA) SCL and SDA input capacitance IL leakage current on A0, A1, A2 - 1 - A Ipd pull-down current internal; A0, A1, A2 pins; VI = 0.3VDD to VDD - - 4.0 A ZIL LOW-level input impedance pins A0, A1, A2; VI < 0.3VDD 30 - - k ZIH HIGH-level input impedance pins A0, A1, A2 800 - - k [1] High-voltage input voltage applied to pin A0 during RWP and CRWP operations. The JEDEC specification is 7 V (min.) and 10 V (max.), but since the SE97 EEPROM write works only down to 3.0 V, the condition of VI(ov) > 4.8 V + VDD or > 4.8 V + 3.0 V was applied and the minimum voltage changed to 7.8 V. If VDD is 3.6 V then the minimum voltage is 8.4 V. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 39 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 002aac910 500 IDD(AV) (A) 400 002aac911 5 Isd(VDD) (A) 3 VDD = 3.6 V 300 3.0 V 200 VDD = 3.6 V 1 100 3.0 V 0 -40 0 40 80 120 Tamb (C) -1 -40 I2C-bus and EEPROM inactive. 0 40 80 120 Tamb (C) I2C-bus, temp sensor and EEPROM inactive. Fig 26. Average supply current Fig 27. Shutdown supply current 002aac912 600 IDD(AV) (A) 500 002aad769 3.5 Tlim(acc) (C) 2.0 1.0 VDD = 3.6 V 0 400 3.0 V -1.0 300 -2.0 200 -40 0 40 80 120 Tamb (C) -3.5 -50 Temp sensor and EEPROM active. -25 0 25 50 125 100 Tamb (C) 75 VDD = 3.0 V to 3.6 V. Fig 28. Average supply current during EEPROM write 002aad258 8.0 IOL (mA) 6.0 Fig 29. Typical temperature accuracy 002aad767 30 IOL(sink)EVENT (mA) VDD = 3.0 V to 3.6 V 20 VDD = 1.7 V 10 4.0 VDD = 3.7 V 3.3 V 2.9 V 1.7 V 2.0 0 -50 -25 0 25 50 75 125 100 Tamb (C) VOL1 = 0.4 V. 0 -50 0 25 50 75 125 100 Tamb (C) VOL1 = 0.4 V. Fig 30. EVENT output current SE97PW, SE97TK Fig 31. EVENT output current SE97TL, SE97TP SE97_7 Product data sheet -25 (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 40 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 002aac907 25 IOL(sink)(SDA) (mA) 20 002aac908 15 conversion rate (conv/s) 13 VDD = 3.6 V 15 11 3.0 V 10 9 5 7 0 -40 0 40 80 5 -40 120 Tamb (C) VOL2 = 0.6 V. 0 40 80 120 Tamb (C) VDD = 3.0 V to 3.6 V. Fig 32. SDA output current Fig 33. Conversion rate 002aac909 140 Tconv (ms) 002aac902 5 Tcy(W) (ms) 120 4 100 3 80 60 -40 0 40 80 2 -40 120 Tamb (C) VDD = 3.0 V to 3.6 V. 0 40 80 120 Tamb (C) VDD = 3.0 V to 3.6 V. Fig 34. Conversion period Fig 35. EEPROM write cycle time 002aac903 3.0 Vth (V) 2.8 002aac904 1.6 Vth (V) 1.4 2.6 2.4 1.2 2.2 2.0 -40 0 40 80 120 Tamb (C) 1.0 -40 0 40 For temp sensor conversion. For EEPROM read operation. VDD = 3.0 V to 3.6 V. VDD = 1.7 V to 3.6 V. Fig 36. Average power-on threshold voltage 120 Tamb (C) Fig 37. Average power-on threshold voltage SE97_7 Product data sheet 80 (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 41 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 002aac905 120 thermal response (%) 002aac914 5 temp error (C) 3 80 (1) (2) 1 40 0 0 1 2 3 4 5 -1 102 time (s) VDD = 3.0 V to 3.6 V. From 25 C (air) to 120 C (oil bath). 103 104 105 106 107 108 noise frequency (Hz) VDD = 3.3 V + 150 mV (p-p); 0.1 F AC coupling capacitor; no decoupling capacitor; Tamb = 25 C. (1) TSSOP8 (2) HVSON8, HWSON8, HXSON8 Fig 38. Package thermal response Fig 39. Temperature error versus power supply noise frequency SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 42 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Table 30. SMBus AC characteristics VDD = 1.7 V to 3.6 V; Tamb = -40 C to +125 C; unless otherwise specified. These specifications are guaranteed by design. The AC specifications fully meet or exceed SMBus 2.0 specifications, but allow the bus to interface with the I2C-bus from DC to 400 kHz. Symbol Parameter Conditions Standard mode Min 10[1] Fast mode Unit Max Min Max 100 10[1] 400 fSCL SCL clock frequency tHIGH HIGH period of the SCL clock 70 % to 70 % 4000 - 600 - ns tLOW LOW period of the SCL clock 30 % to 30 % 4700 - 1300 - ns tto(SMBus) SMBus time-out time 25 35 25 35 ms tr rise time of both SDA and SCL signals - 1000 20 300 ns tf fall time of both SDA and SCL signals - 300 - 300 ns tSU;DAT data set-up time 250 - 100 - ns th(i)(D) data input hold time 0 - 0 - ns tHD;DAT data hold time [4] 200 3450 200 900 ns tSU;STA set-up time for a repeated START condition [5] 4700 - 600 - ns tHD;STA hold time (repeated) START condition [6] 4000 - 600 - ns tSU;STO set-up time for STOP condition 4000 - 600 - ns tBUF bus free time between a STOP and START condition 4700 - 1300 - ns tSP pulse width of spikes that must be suppressed by the input filter - 50 - 50 ns tVD;DAT data valid time 200 - 200 - ns tf(o) output fall time - - - 250 ns tPOR power-on reset pulse time 0.5 - 0.5 - s LOW period to reset SMBus [2][3] 30 % of SDA to 70 % of SCL [2] from clock power supply falling kHz EEPROM power-up timing[7] tpu(R) tpu(W) read power-up time [8] - 1 - 1 ms write power-up time [8] - 1 - 1 ms [9] - 10 - 10 ms Write cycle limits Tcy(W) [1] write cycle time Minimum clock frequency is 0 kHz if SMBus Time-out is disabled. [2] Delay from SDA STOP to SDA START. [3] A device must internally provide a hold time of at least 200 ns for SDA signal (referenced to the VIH(min) of the SCL signal) to bridge the undefined region of the falling edge of SCL. [4] Delay from SCL HIGH-to-LOW transition to SDA edges. [5] Delay from SCL LOW-to-HIGH transition to restart SDA. [6] Delay from SDA START to first SCL HIGH-to-LOW transition. [7] These parameters tested initially and after a design or process change that affects the parameter. [8] tpu(R) and tpu(W) are the delays required from the time VDD is stable until the specified operation can be initiated. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 43 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V [9] The write cycle time is the time elapsed between the STOP command (following the write instruction) and the completion of the internal write cycle. During the internal write cycle, SDA is released by the slave and the device does not acknowledge external commands. tLOW tr tf VIH VIL SCL tHD;STA tHD;DAT tBUF tHIGH tSU;STA tSU;STO tSU;DAT tHD;DAT VIH VIL SDA P S S P VIH VIL SCL tSU;STA tSU;STO VIH VIL SDA tW STOP condition write cycle START condition 002aae750 S = START condition P = STOP condition Fig 40. AC waveforms SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 44 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 12. Package outline TSSOP8: plastic thin shrink small outline package; 8 leads; body width 4.4 mm SOT530-1 E A D X c y HE v M A Z 8 5 A2 A (A3) A1 pin 1 index Lp L detail X 1 4 e w M bp 0 2.5 5 mm scale DIMENSIONS (mm are the original dimensions) UNIT A max. A1 A2 A3 bp c D(1) E(2) e HE L Lp v w y Z(1) mm 1.1 0.15 0.05 0.95 0.85 0.25 0.30 0.19 0.20 0.13 3.1 2.9 4.5 4.3 0.65 6.5 6.3 0.94 0.7 0.5 0.1 0.1 0.1 0.70 0.35 8 0 Notes 1. Plastic or metal protrusions of 0.15 mm maximum per side are not included. 2. Plastic or metal protrusions of 0.25 mm maximum per side are not included. OUTLINE VERSION SOT530-1 REFERENCES IEC JEDEC JEITA EUROPEAN PROJECTION ISSUE DATE 00-02-24 03-02-18 MO-153 Fig 41. Package outline SOT530-1 (TSSOP8) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 45 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V HVSON8: plastic thermal enhanced very thin small outline package; no leads; 8 terminals; body 3 x 3 x 0.85 mm SOT908-1 0 1 2 mm scale X B D A E A A1 c detail X terminal 1 index area e1 terminal 1 index area e v w b 1 4 M M C C A B C y1 C y L exposed tie bar (4x) Eh exposed tie bar (4x) 8 5 Dh DIMENSIONS (mm are the original dimensions) UNIT A(1) max. A1 b c D(1) Dh E(1) Eh e e1 L v w y y1 mm 1 0.05 0.00 0.3 0.2 0.2 3.1 2.9 2.25 1.95 3.1 2.9 1.65 1.35 0.5 1.5 0.5 0.3 0.1 0.05 0.05 0.1 Note 1. Plastic or metal protrusions of 0.075 mm maximum per side are not included. OUTLINE VERSION SOT908-1 REFERENCES IEC JEDEC JEITA EUROPEAN PROJECTION ISSUE DATE 05-09-26 05-10-05 MO-229 Fig 42. Package outline SOT908-1 (HVSON8) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 46 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V HXSON8: plastic thermal enhanced extremely thin small outline package; no leads; 8 terminals; body 2 x 3 x 0.5 mm X b v A B M B D SOT1052-1 A A E A1 detail X terminal 1 index area C 1/2 e terminal 1 index area y1 C e 1 y 4 L (8x) Eh 8 5 Dh 0 1 scale DIMENSIONS (mm are the original dimensions) UNIT mm max nom min A(1) A1 b D D1 E E1 0.5 0.04 0.3 2.1 2.0 1.9 1.6 3.1 3.0 2.9 1.6 0.2 1.4 2 mm e L v y y1 0.1 0.05 0.05 0.45 0.5 1.4 0.35 Note 1. Dimension A is including plating thickness. The package footprint is compatible with JEDEC MO229 OUTLINE VERSION SOT1052-1 REFERENCES IEC JEDEC JEITA EUROPEAN PROJECTION ISSUE DATE 08-01-11 08-03-11 MO-229 Fig 43. Package outline SOT1052-1 (HXSON8) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 47 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V HWSON8: plastic thermal enhanced very very thin small outline package; no leads; 8 terminals; body 2 x 3 x 0.8 mm X b v SOT1069-1 A B B D A A2 A E A1 A3 terminal 1 index area detail X C 1/2 e terminal 1 index area y1 C e 1 y 4 L (8x) K E2 8 5 D2 0 1 scale Dimensions Unit mm 2 mm A(1) A1 A2 max 0.80 0.05 0.65 nom 0.75 0.02 0.55 min 0.70 0 0.45 A3 b D D2 E E2 2.1 2.0 1.9 1.6 3.1 3.0 2.9 1.6 0.2 0.30 0.25 0.20 1.4 e K L v y y1 0.45 0.5 1.4 0.1 0.2 0.05 0.05 0.35 Note 1. Dimension A is including plating thickness. The package footprint is compatible with JEDEC MO229 Outline version SOT1069-1 References IEC JEDEC JEITA sot1069-1_po European projection Issue date 08-07-10 09-08-10 MO-229 Fig 44. Package outline SOT1069-1 (HWSON8) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 48 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V HWSON8: plastic thermal enhanced very very thin small outline package; no leads; 8 terminals; body 2 x 3 x 0.8 mm SOT1069-2 X A B D A2 A E A1 A3 terminal 1 index area detail X e1 terminal 1 index area e 1 4 C C A B C v w b y y1 C L K E2 8 5 D2 0 1 scale Dimensions Unit mm 2 mm A(1) A1 A2 max 0.80 0.05 0.65 nom 0.75 0.02 0.55 min 0.70 0.00 0.45 A3 b D(1) D2 E(1) E2 0.2 0.30 0.25 0.18 2.1 2.0 1.9 1.6 1.5 1.4 3.1 3.0 2.9 1.6 1.5 1.4 e 0.5 e1 1.5 K L 0.40 0.45 0.35 0.40 0.30 0.35 v 0.1 w y y1 0.05 0.05 0.05 Note 1. Plastic or metal protrusions of 0.075 mm maximum per side are not included. References Outline version IEC JEDEC JEITA SOT1069-2 --- MO-229 --- sot1069-2_po European projection Issue date 09-10-22 09-11-18 Fig 45. Package outline SOT1069-2 (HWSON8) SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 49 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 13. Soldering of SMD packages This text provides a very brief insight into a complex technology. A more in-depth account of soldering ICs can be found in Application Note AN10365 "Surface mount reflow soldering description". 13.1 Introduction to soldering Soldering is one of the most common methods through which packages are attached to Printed Circuit Boards (PCBs), to form electrical circuits. The soldered joint provides both the mechanical and the electrical connection. There is no single soldering method that is ideal for all IC packages. Wave soldering is often preferred when through-hole and Surface Mount Devices (SMDs) are mixed on one printed wiring board; however, it is not suitable for fine pitch SMDs. Reflow soldering is ideal for the small pitches and high densities that come with increased miniaturization. 13.2 Wave and reflow soldering Wave soldering is a joining technology in which the joints are made by solder coming from a standing wave of liquid solder. The wave soldering process is suitable for the following: * Through-hole components * Leaded or leadless SMDs, which are glued to the surface of the printed circuit board Not all SMDs can be wave soldered. Packages with solder balls, and some leadless packages which have solder lands underneath the body, cannot be wave soldered. Also, leaded SMDs with leads having a pitch smaller than ~0.6 mm cannot be wave soldered, due to an increased probability of bridging. The reflow soldering process involves applying solder paste to a board, followed by component placement and exposure to a temperature profile. Leaded packages, packages with solder balls, and leadless packages are all reflow solderable. Key characteristics in both wave and reflow soldering are: * * * * * * Board specifications, including the board finish, solder masks and vias Package footprints, including solder thieves and orientation The moisture sensitivity level of the packages Package placement Inspection and repair Lead-free soldering versus SnPb soldering 13.3 Wave soldering Key characteristics in wave soldering are: * Process issues, such as application of adhesive and flux, clinching of leads, board transport, the solder wave parameters, and the time during which components are exposed to the wave * Solder bath specifications, including temperature and impurities SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 50 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 13.4 Reflow soldering Key characteristics in reflow soldering are: * Lead-free versus SnPb soldering; note that a lead-free reflow process usually leads to higher minimum peak temperatures (see Figure 46) than a SnPb process, thus reducing the process window * Solder paste printing issues including smearing, release, and adjusting the process window for a mix of large and small components on one board * Reflow temperature profile; this profile includes preheat, reflow (in which the board is heated to the peak temperature) and cooling down. It is imperative that the peak temperature is high enough for the solder to make reliable solder joints (a solder paste characteristic). In addition, the peak temperature must be low enough that the packages and/or boards are not damaged. The peak temperature of the package depends on package thickness and volume and is classified in accordance with Table 31 and 32 Table 31. SnPb eutectic process (from J-STD-020C) Package thickness (mm) Package reflow temperature (C) Volume (mm3) < 350 350 < 2.5 235 220 2.5 220 220 Table 32. Lead-free process (from J-STD-020C) Package thickness (mm) Package reflow temperature (C) Volume (mm3) < 350 350 to 2000 > 2000 < 1.6 260 260 260 1.6 to 2.5 260 250 245 > 2.5 250 245 245 Moisture sensitivity precautions, as indicated on the packing, must be respected at all times. Studies have shown that small packages reach higher temperatures during reflow soldering, see Figure 46. SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 51 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V maximum peak temperature = MSL limit, damage level temperature minimum peak temperature = minimum soldering temperature peak temperature time 001aac844 MSL: Moisture Sensitivity Level Fig 46. Temperature profiles for large and small components For further information on temperature profiles, refer to Application Note AN10365 "Surface mount reflow soldering description". 14. Abbreviations Table 33. Abbreviations Acronym Description ADC Analog-to-Digital Converter ARA Alert Response Address CDM Charged-Device Model CMOS Complementary Metal-Oxide Semiconductor CPU Central Processing Unit DDR Double Data Rate DIMM Dual In-line Memory Module DRAM Dynamic Random Access Memory ECC Error-Correcting Code EEPROM Electrically Erasable Programmable Read-Only Memory ESD ElectroStatic Discharge HBM Human Body Model I2C-bus Inter-Integrated Circuit bus LSB Least Significant Bit MM Machine Model MSB Most Significant Bit PC Personal Computer PCB Printed-Circuit Board POR Power-On Reset SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 52 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V Table 33. Abbreviations ...continued Acronym Description RDIMM Registered Dual In-line Memory Module SMBus System Management Bus SO-DIMM Small Outline Dual In-line Memory Module SPD Serial Presence Detect 15. Revision history Table 34. Revision history Document ID Release date Data sheet status Change notice Supersedes SE97_7 20100129 Product data sheet - SE97_6 Modifications: * Table 1 "Ordering information": - added Type number SE97TP/S900 - added Table note [3] * * * Added (new) Figure 6 "Pin configuration for HWSON8 (SOT1069-2)" Section 7.7 "SMBus time-out", 1st paragraph, second sentence: changed from "between 25 ns and 35 ms" to "between 25 ms and 35 ms" Table 8 "Register summary", address 07h (Device ID/Revision register): - Default state is split: A200h for SE97PW, SE97TK; A201h for SE97TP, SE97TL * Section 8.8 "Device ID register": - 1st paragraph, 1st sentence: changed from "The SE97 device ID is A1h." to "The SE97 device ID is A2h." - Table note [1] modified * Added (new) Figure 45 "Package outline SOT1069-2 (HWSON8)" SE97_6 20090817 Product data sheet - SE97_5 SE97_5 20090806 Product data sheet - SE97_4 SE97_4 20090130 Product data sheet - SE97_3 SE97_3 20080715 Product data sheet - SE97_2 SE97_2 20071012 Product data sheet - SE97_1 SE97_1 20070524 Objective data sheet - - SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 53 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 16. Legal information 16.1 Data sheet status Document status[1][2] Product status[3] Definition Objective [short] data sheet Development This document contains data from the objective specification for product development. Preliminary [short] data sheet Qualification This document contains data from the preliminary specification. Product [short] data sheet Production This document contains the product specification. [1] Please consult the most recently issued document before initiating or completing a design. [2] The term `short data sheet' is explained in section "Definitions". [3] The product status of device(s) described in this document may have changed since this document was published and may differ in case of multiple devices. The latest product status information is available on the Internet at URL http://www.nxp.com. 16.2 Definitions Draft -- The document is a draft version only. The content is still under internal review and subject to formal approval, which may result in modifications or additions. NXP Semiconductors does not give any representations or warranties as to the accuracy or completeness of information included herein and shall have no liability for the consequences of use of such information. Short data sheet -- A short data sheet is an extract from a full data sheet with the same product type number(s) and title. A short data sheet is intended for quick reference only and should not be relied upon to contain detailed and full information. For detailed and full information see the relevant full data sheet, which is available on request via the local NXP Semiconductors sales office. In case of any inconsistency or conflict with the short data sheet, the full data sheet shall prevail. 16.3 Disclaimers General -- Information in this document is believed to be accurate and reliable. However, NXP Semiconductors does not give any representations or warranties, expressed or implied, as to the accuracy or completeness of such information and shall have no liability for the consequences of use of such information. Right to make changes -- NXP Semiconductors reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof. Suitability for use -- NXP Semiconductors products are not designed, authorized or warranted to be suitable for use in medical, military, aircraft, space or life support equipment, nor in applications where failure or malfunction of an NXP Semiconductors product can reasonably be expected to result in personal injury, death or severe property or environmental damage. NXP Semiconductors accepts no liability for inclusion and/or use of NXP Semiconductors products in such equipment or applications and therefore such inclusion and/or use is at the customer's own risk. Applications -- Applications that are described herein for any of these products are for illustrative purposes only. NXP Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. Limiting values -- Stress above one or more limiting values (as defined in the Absolute Maximum Ratings System of IEC 60134) may cause permanent damage to the device. Limiting values are stress ratings only and operation of the device at these or any other conditions above those given in the Characteristics sections of this document is not implied. Exposure to limiting values for extended periods may affect device reliability. Terms and conditions of sale -- NXP Semiconductors products are sold subject to the general terms and conditions of commercial sale, as published at http://www.nxp.com/profile/terms, including those pertaining to warranty, intellectual property rights infringement and limitation of liability, unless explicitly otherwise agreed to in writing by NXP Semiconductors. In case of any inconsistency or conflict between information in this document and such terms and conditions, the latter will prevail. No offer to sell or license -- Nothing in this document may be interpreted or construed as an offer to sell products that is open for acceptance or the grant, conveyance or implication of any license under any copyrights, patents or other industrial or intellectual property rights. Export control -- This document as well as the item(s) described herein may be subject to export control regulations. Export might require a prior authorization from national authorities. 16.4 Trademarks Notice: All referenced brands, product names, service names and trademarks are the property of their respective owners. I2C-bus -- logo is a trademark of NXP B.V. 17. Contact information For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com SE97_7 Product data sheet (c) NXP B.V. 2010. All rights reserved. Rev. 07 -- 29 January 2010 54 of 55 SE97 NXP Semiconductors DDR memory module temp sensor with integrated SPD, 3.3 V 18. Contents 1 2 2.1 2.2 2.3 3 4 5 6 6.1 6.2 7 7.1 7.2 7.3 7.3.1 General description . . . . . . . . . . . . . . . . . . . . . . 1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 General features . . . . . . . . . . . . . . . . . . . . . . . . 2 Temperature sensor features . . . . . . . . . . . . . . 2 Serial EEPROM features . . . . . . . . . . . . . . . . . 2 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Ordering information . . . . . . . . . . . . . . . . . . . . . 3 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Pinning information . . . . . . . . . . . . . . . . . . . . . . 5 Pinning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . 6 Functional description . . . . . . . . . . . . . . . . . . . 7 Serial bus interface . . . . . . . . . . . . . . . . . . . . . . 7 Slave address . . . . . . . . . . . . . . . . . . . . . . . . . . 7 EVENT output condition . . . . . . . . . . . . . . . . . . 8 EVENT pin output voltage levels and resistor sizing . . . . . . . . . . . . . . . . . . . . . . . . . . 8 7.3.2 EVENT thresholds . . . . . . . . . . . . . . . . . . . . . 10 7.3.2.1 Alarm window . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.3.2.2 Critical trip. . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 7.3.3 EVENT operation modes . . . . . . . . . . . . . . . . 11 7.3.3.1 Comparator mode. . . . . . . . . . . . . . . . . . . . . . 11 7.3.3.2 Interrupt mode . . . . . . . . . . . . . . . . . . . . . . . . 11 7.4 Conversion rate . . . . . . . . . . . . . . . . . . . . . . . 12 7.4.1 What temperature is read when conversion is in progress . . . . . . . . . . . . . . . . 12 7.5 Power-up default condition . . . . . . . . . . . . . . . 12 7.6 Device initialization . . . . . . . . . . . . . . . . . . . . . 12 7.7 SMBus time-out . . . . . . . . . . . . . . . . . . . . . . . 13 7.8 SMBus ALERT Response Address (ARA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 7.9 SMBus/I2C-bus interface . . . . . . . . . . . . . . . . 14 7.10 EEPROM operation . . . . . . . . . . . . . . . . . . . . 17 7.10.1 Write operations . . . . . . . . . . . . . . . . . . . . . . . 17 7.10.1.1 Byte Write . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7.10.1.2 Page Write . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7.10.1.3 Acknowledge polling . . . . . . . . . . . . . . . . . . . . 18 7.10.2 Memory protection . . . . . . . . . . . . . . . . . . . . . 18 7.10.2.1 Permanent Write Protection (PWP) . . . . . . . . 20 7.10.2.2 Reversible Write Protection (RWP) and Clear Reversible Write Protection (CRWP) . . 20 7.10.2.3 Read Permanent Write Protection (RPWP), Read Reversible Write Protection (RRWP), and Read Clear Reversible Write Protection (RCRWP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 7.10.3 Read operations . . . . . . . . . . . . . . . . . . . . . . . 21 7.10.3.1 Current address read . . . . . . . . . . . . . . . . . . . 21 7.10.3.2 Selective read . . . . . . . . . . . . . . . . . . . . . . . . 7.10.3.3 Sequential read . . . . . . . . . . . . . . . . . . . . . . . 7.11 Hot plugging. . . . . . . . . . . . . . . . . . . . . . . . . . 8 Register descriptions . . . . . . . . . . . . . . . . . . . 8.1 Register overview . . . . . . . . . . . . . . . . . . . . . 8.2 Capability register (00h, 16-bit read-only) . . . . . . . . . . . . . . . . . . 8.3 Configuration register (01h, 16-bit read/write). . . . . . . . . . . . . . . . . . 8.4 Temperature format . . . . . . . . . . . . . . . . . . . . 8.5 Temperature Trip Point registers . . . . . . . . . . 8.5.1 Upper Boundary Alarm Trip register (16-bit read/write). . . . . . . . . . . . . . . . . . . . . . 8.5.2 Lower Boundary Alarm Trip register (16-bit read/write). . . . . . . . . . . . . . . . . . . . . . 8.5.3 Critical Alarm Trip register (16-bit read/write). . . . . . . . . . . . . . . . . . . . . . 8.6 Temperature register (16-bit read-only) . . . . . . . . . . . . . . . . . . . . . . 8.7 Manufacturer's ID register (16-bit read-only) . . . . . . . . . . . . . . . . . . . . . . 8.8 Device ID register . . . . . . . . . . . . . . . . . . . . . 8.9 SMBus register . . . . . . . . . . . . . . . . . . . . . . . 9 Application design-in information. . . . . . . . . 9.1 SE97 in memory module application . . . . . . . 9.2 Layout consideration . . . . . . . . . . . . . . . . . . . 9.3 Thermal considerations . . . . . . . . . . . . . . . . . 10 Limiting values . . . . . . . . . . . . . . . . . . . . . . . . 11 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . 12 Package outline. . . . . . . . . . . . . . . . . . . . . . . . 13 Soldering of SMD packages . . . . . . . . . . . . . . 13.1 Introduction to soldering. . . . . . . . . . . . . . . . . 13.2 Wave and reflow soldering. . . . . . . . . . . . . . . 13.3 Wave soldering . . . . . . . . . . . . . . . . . . . . . . . 13.4 Reflow soldering . . . . . . . . . . . . . . . . . . . . . . 14 Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . 15 Revision history . . . . . . . . . . . . . . . . . . . . . . . 16 Legal information . . . . . . . . . . . . . . . . . . . . . . 16.1 Data sheet status . . . . . . . . . . . . . . . . . . . . . . 16.2 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.3 Disclaimers . . . . . . . . . . . . . . . . . . . . . . . . . . 16.4 Trademarks . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Contact information . . . . . . . . . . . . . . . . . . . . 18 Contents. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 22 23 23 23 24 25 29 30 30 31 31 32 33 33 34 35 36 36 36 37 38 45 50 50 50 50 51 52 53 54 54 54 54 54 54 55 Please be aware that important notices concerning this document and the product(s) described herein, have been included in section `Legal information'. (c) NXP B.V. 2010. All rights reserved. For more information, please visit: http://www.nxp.com For sales office addresses, please send an email to: salesaddresses@nxp.com Date of release: 29 January 2010 Document identifier: SE97_7