TM P435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 1C TEMPERATURE SENSOR with Series-R, n-Factor, Automatic Beta Compensation and Programmable Addressing Check for Samples: TMP435 FEATURES DESCRIPTION * * * * * * * The TMP435 is a remote temperature sensor monitor with a built-in local temperature sensor. The remote temperature sensor diode-connected transistors are typically low-cost, NPN- or PNP-type transistors or diodes that are an integral part of microcontrollers, microprocessors, or FPGAs. 1 234 * * * * 1C REMOTE DIODE SENSOR 1C LOCAL TEMPERATURE SENSOR AUTOMATIC BETA COMPENSATION n-FACTOR CORRECTION PROGRAMMABLE THRESHOLD LIMITS TWO-WIRE/ SMBusTM SERIAL INTERFACE MINIMUM AND MAXIMUM TEMPERATURE MONITORS MULTIPLE INTERFACE ADDRESSES ALERT/THERM2 PIN CONFIGURATION DIODE FAULT DETECTION PIN-PROGRAMMABLE TWO-WIRE ADDRESSING Remote accuracy is 1C for multiple IC manufacturers, with no calibration needed. The two-wire serial interface accepts SMBus write byte, read byte, send byte, and receive byte commands to program the alarm thresholds and to read temperature data. The TMP435 includes beta compensation (correction), series resistance cancellation, programmable non-ideality factor, programmable resolution, programmable threshold limits, minimum and maximum temperature monitors, wide remote temperature measurement range (up to +150C), diode fault detection, a temperature alert function, and pin-programmable two-wire addressing using 3-state logic. APPLICATIONS * * * * * * * * LCD/ DLP(R)/LCOS PROJECTORS SERVERS INDUSTRIAL CONTROLLERS CENTRAL OFFICE TELECOM EQUIPMENT DESKTOP AND NOTEBOOK COMPUTERS STORAGE AREA NETWORKS (SAN) INDUSTRIAL AND MEDICAL EQUIPMENT PROCESSOR/FPGA TEMPERATURE MONITORING The TMP435 is available in an MSOP-10 package. +5V TMP435 1 V+ SCL 2 3 SDA 9 DXN SMBus Controller 7 6 10 DXP THERM A0 GND A1 4 5 ALERT/THERM2 8 One Channel Local One Channel Remote 1 2 3 4 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. DLP is a registered trademark of Texas Instruments. SMBus is a trademark of Intel Corporation. All other trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright (c) 2010, Texas Instruments Incorporated TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications. PACKAGE INFORMATION (1) (1) PRODUCT DESCRIPTION TMP435 Remote Junction Temperature Sensor TWO-WIRE ADDRESS PACKAGE-LEAD PACKAGE DESIGNATOR PACKAGE MARKING Pin-programmable MSOP-10 DGS DTPI For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. ABSOLUTE MAXIMUM RATINGS (1) Over operating free-air temperature range, unless otherwise noted. Power Supply, VS Input Voltage Pins 2, 3, 4, 5 and 8 only Pins 7, 9, and 10 only TMP435 UNIT +7.0 V -0.5 to VS + 0.5 V -0.5 to 7 V 10 mA Operating Temperature Range -55 to +127 C Storage Temperature Range -60 to +130 C +150 C Human Body Model (HBM) 4000 V Charged Device Model (CDM) 1000 V Machine Model (MM) 200 V Input Current Junction Temperature (TJ max) ESD Rating (1) 2 Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not implied. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 ELECTRICAL CHARACTERISTICS At TA = -40C to +125C and VS = 2.7V to 5.5V, unless otherwise noted. TMP435 PARAMETER CONDITIONS MIN TYP MAX UNIT TEMPERATURE ERROR Local Temperature Sensor Remote Temperature Sensor TELOCAL (1) TEREMOTE vs Supply (Local/Remote) TA = -40C to +125C 1.25 2.5 C TA = +0C to +100C, VS = 3.3V 0.25 1 C TA = 0C to +100C, TDIODE = -40C to +150C, VS = 3.3V 0.25 1 C TA = -40C to +100C, TDIODE = -40C to +150C, VS = 3.3V 0.5 1.5 C TA = -40C to +125C, TDIODE = -40C to +150C 3 5 C VS = 2.7V to 5.5V 0.2 0.5 C/V 12 15 17 ms RC = 1 97 126 137 ms RC = 0 36 47 52 ms RC = 1 72 93 100 ms RC = 0 33 44 47 ms TEMPERATURE MEASUREMENT Conversion Time (per channel) Local Channel Remote Channel MBeta Correction Enabled (2) MBeta Correction Disabled (3) Resolution Local Channel 12 Bits Remote Channel 12 Bits Remote Sensor Source Currents High 120 mA Medium High 60 mA Medium Low 12 mA Low 6 mA Series Resistance (beta correction) (4) 1.000 (2) Remote Transistor Ideality Factor n TMP435 optimized ideality factor Beta Correction Range b 0.1 Logic Input High Voltage (SCL, SDA) VIH 2.1 Logic Input Low Voltage (SCL, SDA) VIL 1.008 (3) 27 SMBus INTERFACE 0.8 Hysteresis 500 SMBus Output Low Sink Current SDA Output Low Voltage V 6 VOL IOUT = 6mA 0 VIN 6V Logic Input Current mA 0.15 -1 SMBus Input Capacitance (SCL, SDA) 0.4 V +1 mA 3.4 MHz 35 ms 1 ms 3 SMBus Clock Frequency SMBus Timeout 25 V mV 32 SCL Falling Edge to SDA Valid Time pF DIGITAL OUTPUTS Output Low Voltage VOL IOUT = 6mA 0.15 0.4 V High-Level Output Leakage Current IOH VOUT = VS 0.1 1 mA ALERT/THERM2 Output Low Sink Current THERM Output Low Sink Current (1) (2) (3) (4) ALERT/THERM2 Forced to 0.4V 6 mA THERM2 Forced to 0.4V 6 mA Tested with less than 5 effective series resistance and 100pF differential input capacitance. TA is the ambient temperature of the TMP435. TDIODE is the temperature at the remote diode sensor. Beta correction configuration set to '1000' and sensor is GND collector-connected (PNP collector to ground). Beta correction configuration set to '0111' or sensor is diode-connected (base shorted to collector). If beta correction is disabled ('0111'), then up to 1k of series line resistance is cancelled; if beta correction is enabled ('1xxx'), up to 300 is cancelled. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 3 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com ELECTRICAL CHARACTERISTICS (continued) At TA = -40C to +125C and VS = 2.7V to 5.5V, unless otherwise noted. TMP435 PARAMETER CONDITIONS MIN TYP MAX UNIT POWER SUPPLY Specified Voltage Range VS Quiescent Current IQ Undervoltage Lockout Power-On Reset Threshold 2.7 5.5 V 45 mA 0.7 1 mA 3 10 mA 0.0625 Conversions per Second, VS = 3.3V 35 Eight Conversions per Second, VS = 3.3V (5) Serial Bus Inactive, Shutdown Mode Serial Bus Active, fS = 400kHz, Shutdown Mode 90 Serial Bus Active, fS = 3.4MHz, Shutdown Mode 350 UVLO 2.3 POR mA mA 2.4 2.6 V 1.6 2.3 V C TEMPERATURE RANGE Specified Range -40 +125 Storage Range -60 +130 Thermal Resistance, MSOP-10 (5) 4 165 qJA C C/W Beta correction disabled. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 DEVICE INFORMATION DGS PACKAGE MSOP-10 (TOP VIEW) V+ 1 10 SCL DXP 2 9 SDA RT/THERM2 DXN 3 8 ALERT/THERM2 A0 4 7 THERM A1 5 6 GND PIN ASSIGNMENTS TMP435 NO. NAME 1 V+ DESCRIPTION 2 DXP Positive connection to remote temperature sensor 3 DXN Negative connection to remote temperature sensor 4 A0 Address pin 0 5 A1 Address pin 1 6 GND 7 THERM 8 ALERT/THERM2 9 SDA Serial data line for SMBus, open-drain; requires pull-up resistor to V+ 10 SCL Serial clock line for SMBus, open-drain; requires pull-up resistor to V+ Positive supply (2.7V to 5.5V) Ground Thermal flag, active low, open-drain; requires pull-up resistor to V+ Alert (reconfigurable as second thermal flag), active low, open-drain; requires pull-up resistor to V+ Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 5 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com TYPICAL CHARACTERISTICS At TA = +25C and VS = 3.3V, unless otherwise noted. REMOTE TEMPERATURE ERROR vs TEMPERATURE LOCAL TEMPERATURE ERROR vs TEMPERATURE 3 Local Temperature Error (C) Remote Temperature Error (C) 3 2 1 0 -1 -2 Beta Compensation Disabled. GND Collector-Connected Transistor with n-factor = 1.008. -3 2 1 0 -1 -2 -3 -50 75 0 25 50 Ambient Temperature, TA (C) -25 100 125 -50 75 0 25 50 Ambient Temperature, TA (C) -25 Figure 1. Figure 2. REMOTE TEMPERATURE ERROR vs LEAKAGE RESISTANCE QUIESCENT CURRENT vs CONVERSION RATE 150 700 100 600 100 125 4 8 RGND (Low Beta) 50 500 RGND IQ (mA) Remote Temperature Error (C) VS = 3.3V 0 -50 400 300 200 RVs -100 100 RVs (Low Beta) 0 0.0625 0.125 -150 0 5 10 15 20 25 30 1 2 Figure 4. SHUTDOWN QUIESCENT CURRENT vs SCL CLOCK FREQUENCY SHUTDOWN QUIESCENT CURRENT vs SUPPLY VOLTAGE 500 4.0 450 3.5 3.0 350 VS = 5.5V 300 2.5 IQ (mA) IQ (mA) 0.5 Figure 3. 400 250 200 2.0 1.5 150 1.0 100 50 0.5 VS = 3.3V 0 0 1k 10k 100k 1M 10M 2.5 3.0 3.5 4.0 4.5 5.0 5.5 VS (V) SCL Clock Frequency (Hz) Figure 5. 6 0.25 Conversion Rate (conversions/s) Leakage Resistance (MW) Figure 6. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 TYPICAL CHARACTERISTICS (continued) At TA = +25C and VS = 3.3V, unless otherwise noted. REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE REMOTE TEMPERATURE ERROR vs SERIES RESISTANCE (Low-Beta Transistor) 2.5 GND Collector-Connected Transistor, 2N3906 (PNP) (1)(2) 2 1 0 Diode-Connected Transistor, 2N3906 (PNP) (2) -1 NOTES (1): Temperature offset is the result of n-factor being automatically set to 1.000. Approximate n-factor of 2N3906 is 1.008. (2) See Figure 11 for schematic configuration. -2 Remote Temperature Error (C) Remote Temperature Error (C) 3 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3 0 100 200 300 400 500 600 700 800 900 0 1k 100 200 REMOTE TEMPERATURE ERROR vs DIFFERENTIAL CAPACITANCE AT +25C, VCC = 3.3V, RS = 0 REMOTE TEMPERATURE ERROR vs DIFFERENTIAL CAPACITANCE with 45nm CPU AT +25C, VCC = 3.3V, RS = 0, Beta = 011 (AUTO) 3 2 Low-Beta Transistor (Disabled) GND CollectorConnected Transistor (Disabled) 0 -1 Diode-Connected Transistor (Auto, Disabled) -2 500 Figure 8. GND Collector-Connected Transistor (Auto) 1 400 Figure 7. Remote Temperature Error (C) Remote Temperature Error (C) 3 300 RS (W) RS (W) 2 1 0 Low-Beta Transistor (Auto) -1 -2 NOTE: See Figure 12 for schematic configuration. -3 -3 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 0 0.2 Capacitance (nF) 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 Capacitance (nF) Figure 9. Figure 10. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 7 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com PARAMETRIC MEASUREMENT INFORMATION TEST CIRCUITS SERIES RESISTANCE CONFIGURATION (a) GND Collector-Connected Transistor RS (1) DXP DXN RS (1) (b) Diode-Connected Transistor (1) RS DXP DXN RS (1) (1) RS should be less than 1k; see Filtering section. Figure 11. DIFFERENTIAL CAPACITANCE CONFIGURATION (a) GND Collector-Connected Transistor DXP CDIFF (1) DXN (b) Diode-Connected Transistor DXP CDIFF (1) DXN (1) CDIFF should be less than 2200pF; see Filtering section. Figure 12. 8 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 APPLICATION INFORMATION The TMP435 (two-channel) is a digital temperature sensor that combines a local die temperature measurement channel and a remote junction temperature measurement channel in a single package. This device is two-wire- and SMBus interface-compatible, and is specified over a temperature range of -40C to +125C. The TMP435 contains multiple registers for holding configuration information, temperature measurement results, temperature comparator maximum/minimum limits, and status information. User-programmed high and low temperature limits stored in the TMP435 can be used to trigger an over/under temperature alarm (ALERT) on local and remote temperatures. Additional thermal limits can be programmed into the TMP435 and used to trigger another flag (THERM) that can be used to initiate a system response to rising temperatures. For proper remote temperature sensing operation, the TMP435 requires only a transistor connected between DXP and DXN. The SCL and SDA interface pins require pull-up resistors as part of the communication bus, while ALERT and THERM are open-drain outputs that also need pull-up resistors. ALERT and THERM may be shared with other devices if desired for a wired-OR implementation. A 0.1mF power-supply bypass capacitor is recommended for good local bypassing. See Figure 13 for a typical configuration. Beta Compensation Previous generations of remote junction temperature sensors were operated by controlling the emitter current of the sensing transistor. However, examination of the physics of a transistor shows that VBE is actually a function of the collector current. If beta is independent of the collector current, then VBE may be calculated from the emitter current. In earlier generations of processors that contained PNP transistors connected to these temperature sensors, controlling the emitter current provided acceptable temperature measurement results. At 90nm process geometry and below, the beta factor continues to decrease and the premise that it is independent of collector current becomes less certain. To manage this increasing temperature measurement error, the TMP435 controls the collector current instead of the emitter current. The TMP435 automatically detects and chooses the correct range depending on the beta factor of the external transistor. This auto-ranging is performed at the beginning of each temperature conversion in order to correct for any changes in the beta factor as a result of temperature variation. The device can operate a PNP transistor with a beta factor as low as 0.1. See the Beta Compensation Configuration Register section for further information. Series Resistance Cancellation Series resistance in an application circuit that typically results from printed circuit board (PCB) trace resistance and remote line length is automatically cancelled by the TMP435, preventing what would otherwise result in a temperature offset. A total of up to 1k of series line resistance is cancelled by the TMP435 if beta correction is disabled and up to 300 of series line resistance is canceled if beta correction is enabled, eliminating the need for additional characterization and temperature offset correction. See the two Remote Temperature Error vs Series Resistance typical characteristic curves (Figure 7 and Figure 8) for details on the effect of series resistance on sensed remote temperature error. Differential Input Capacitance The TMP435 can tolerate differential input capacitance of up to 2200pF with minimal change in temperature error. The effect of capacitance on sensed remote temperature error is illustrated in Figure 9 and Figure 10, Remote Temperature Error vs Differential Capacitance. See the Filtering section for suggested component values where filtering unwanted coupled signals is needed. Temperature Measurement Data Temperature measurement data are taken over a default range of 0C to +127C for both local and remote locations. However, measurements from -55C to +150C can be made both locally and remotely by reconfiguring the TMP435 for the extended temperature range, as described in this section. Temperature data resulting from conversions within the default measurement range are represented in binary form, as shown in Table 1, Standard Binary column. Note that any temperature below 0C results in a data value of zero (00h). Likewise, temperatures above +127C result in a value of 127 (7Fh). The device can be set to measure over an extended temperature range by changing bit 2 (RANGE) of Configuration Register 1 from low to high. The change in measurement range and data format from standard binary to extended binary occurs at the next temperature conversion. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 9 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com For data captured in the extended temperature range configuration, an offset of 64 (40h) is added to the standard binary value, as shown in Table 1, Extended Binary column. This configuration allows measurement of temperatures as low as -64C, and as high as +191C; however, most temperature-sensing diodes only measure with the range of -55C to +150C. Both local and remote temperature data use two bytes for data storage. The high byte stores the temperature with 1C resolution. The second or low byte stores the decimal fraction value of the temperature and allows a higher measurement resolution, as shown in Table 2. The measurement resolution for both the local and remote channels is 0.0625C, and cannot be adjusted. Additionally, the TMP435 is rated only for ambient local temperatures ranging from -40C to +125C. Parameters in the Absolute Maximum Ratings table must be observed. +5V (1) Transistor-connected configuration : 1 Series Resistance RS RS V+ (2) SCL 2 (3) (2) CDIFF 3 10 DXP SDA DXN 9 SMBus Controller TMP435 7 6 THERM A0 GND A1 4 5 ALERT/THERM2 8 (1) Diode-connected configuration : (2) RS (2) RS CDIFF (3) (1) Diode-connected configuration provides better settling time. Transistor-connected configuration provides better series resistance cancellation. (2) RS (optional) should be < 1k in most applications. Selection of RS depends on specific application; see Filtering section. (3) CDIFF (optional) should be < 2200pF in most applications. Selection of CDIFF depends on specific application; see Filtering section and Figure 9, Remote Temperature Error vs Differential Capacitance. Figure 13. TMP435 Basic Connections 10 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 Table 1. Temperature Data Format (Local and Remote Temperature High Bytes) LOCAL/REMOTE TEMPERATURE REGISTER HIGH BYTE VALUE (+1C RESOLUTION) STANDARD BINARY (1) (1) (2) EXTENDED BINARY (2) TEMP (C) BINARY HEX BINARY -64 0000 0000 00 0000 0000 HEX 00 -50 0000 0000 00 0000 1110 0E -25 0000 0000 00 0010 0111 27 0 0000 0000 00 0100 0000 40 1 0000 0001 01 0100 0001 41 5 0000 0101 05 0100 0101 45 10 0000 1010 0A 0100 1010 4A 25 0001 1001 19 0101 1001 59 50 0011 0010 32 0111 0010 72 75 0100 1011 4B 1000 1011 8B 100 0110 0100 64 1010 0100 A4 125 0111 1101 7D 1011 1101 BD 127 0111 1111 7F 1011 1111 BF 150 0111 1111 7F 1101 0110 D6 175 0111 1111 7F 1110 1111 EF 191 0111 1111 7F 1111 1111 FF Resolution is 1C/count. Negative numbers are represented in twos complement format. Resolution is 1C/count. All values are unsigned with a -64C offset. REGISTER INFORMATION Table 2. Decimal Fraction Temperature Data Format (Local and Remote Temperature Low Bytes) TEMPERATURE REGISTER LOW BYTE VALUE (0.0625C RESOLUTION) (1) The TMP435 contain multiple registers for holding configuration information, temperature measurement results, temperature comparator maximum/minimum, limits, and status information. These registers are described in Figure 14 and in Table 3. TEMP (C) STANDARD AND EXTENDED BINARY HEX 0 0000 0000 00 0.0625 0001 0000 10 0.1250 0010 0000 20 Local and Remote Temperature Registers 0.1875 0011 0000 30 Local and Remote Limit Registers 0.2500 0100 0000 40 0.3125 0101 0000 50 0.3750 0110 0000 60 Status Register 0.4375 0111 0000 70 Configuration Register 0.5000 1000 0000 80 0.5625 1001 0000 90 0.6250 1010 0000 A0 Conversion Rate Register 0.6875 1011 0000 B0 Consecutive Alert Register 0.7500 1100 0000 C0 0.8125 1101 0000 D0 0.8750 1110 0000 E0 0.9375 1111 0000 F0 (1) Pointer Register THERM Hysteresis Register Beta Correction Register SDA I/O Control Interface SCL Identification Registers Figure 14. Internal Register Structure Resolution is 0.0625C/count. All possible values are shown. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 11 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com Table 3. TMP435 Register Map POINTER ADDRESS (HEX) (1) (2) (3) 12 BIT DESCRIPTIONS READ WRITE POWER-ON RESET (HEX) D7 D6 D5 D4 D3 D2 D1 D0 REGISTER DESCRIPTIONS 00 NA (1) 00 LT11 LT10 LT9 LT8 LT7 LT6 LT5 LT4 Local Temperature (High Byte) 01 NA 00 RT11 RT10 RT9 RT8 RT7 RT6 RT5 RT4 Remote Temperature (High Byte) 02 NA 80 BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM Status Register 03 09 00 MASK SD AL/TH 0 0 RANGE 0 0 Configuration Register 1 04 0A 07 0 0 0 0 R3 R2 R1 R0 Conversion Rate Register 05 0B 55 LTH11 LTH10 LTH9 LTH8 LTH7 LTH6 LTH5 LTH4 Local Temperature High Limit (High Byte) 06 0C 00 LTL11 LTL10 LTL9 LTL8 LTL7 LTL6 LTL5 LTL4 Local Temperature Low Limit (High Byte) 07 0D 55 RTH11 RTH10 RTH9 RTH8 RTH7 RTH6 RTH5 RTH4 Remote Temperature High Limit (High Byte) 08 0E 00 RTL11 RTL10 RTL9 RTL8 RTL7 RTL6 RTL5 RTL4 Remote Temperature Low Limit (High Byte) NA 0F XX X (2) X X X X X X X One-Shot Start 10 NA 00 RT3 RT2 RT1 RT0 0 0 0 0 Remote Temperature (Low Byte) 13 13 00 RTH3 RTH2 RTH1 RTH0 0 0 0 0 Remote Temperature High Limit (Low Byte) 14 14 00 RTL3 RTL2 RTL1 RTL0 0 0 0 0 Remote Temperature Low Limit (Low Byte) 15 NA 00 LT3 LT2 LT1 LT0 0 0 0 0 Local Temperature (Low Byte) 16 16 00 LTH3 LTH2 LTH1 LTH0 0 0 0 0 Local Temperature High Limit (Low Byte) 17 17 00 LTL3 LTL2 LTL1 LTL0 0 0 0 0 Local Temperature Low Limit (Low Byte) 18 18 00 NC7 NC6 NC5 NC4 NC3 NC2 NC1 NC0 n-Factor Correction 19 19 55 RTHL7 RTHL6 RTHL5 RTHL4 RTHL3 RTHL2 RTHL1 RTHL0 Remote THERM Limit 1A 1A 1C 0 0 0 REN LEN RC 0 0 Configuration Register 2 1F 1F 00 0 0 0 0 0 0 RIMASK LMASK Channel Mask 20 20 55 LTHL7 LTHL6 LTHL5 LTHL4 LTHL3 LTHL2 LTHL1 LTHL0 Local THERM Limit 21 21 0A TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0 THERM Hysteresis 22 22 70 0 CTH2 CTH1 CTH0 CALT2 CALT1 CALT0 0 Consecutive Alert Register 25 25 08 0 0 0 0 BC3 BC2 BC1 BC0 Beta Range Register NA FC 00 X (3) X X X X X X X Software Reset FD NA 31 0 0 1 1 0 0 0 1 TMP435 Device ID FE NA 55 0 1 0 1 0 1 0 1 Manufacturer ID NA = Not applicable; register is write- or read-only. X = Indeterminate state. X = Undefined. Writing any value to this register initiates a software reset; see the Software Reset section. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 Pointer Register Limit Registers Figure 14 shows the internal register structure of the TMP435. The 8-bit Pointer Register is used to address a given data register. The Pointer Register identifies which of the data registers should respond to a read or write command on the two-wire bus. This register is set with every write command. A write command must be issued to set the proper value in the Pointer Register before executing a read command. Table 3 describes the pointer address of the registers available in the TMP435. The power-on reset (POR) value of the Pointer Register is 00h (0000 0000b). The TMP435 has registers for setting comparator limits for both the local and remote measurement channels. These registers have read and write capability. The High and Low Limit Registers for both channels span two registers, as do the temperature registers. The local temperature high limit is set by writing the high byte to pointer address 0Bh and writing the low byte to pointer address 16h, or by using a single two-byte write command (high byte first) to pointer address 0Bh. Temperature Registers The TMP435 has four 8-bit registers that hold temperature measurement results. Both the local channel and the remote channel have a high byte register that contains the most significant bits (MSBs) of the temperature analog-to-digital converter (ADC) result and a low byte register that contains the least significant bits (LSBs) of the temperature ADC result. The local channel high byte address for the TMP435 is 00h; the local channel low byte address is 15h. The remote channel high byte is at address 01h; the remote channel low byte address is 10h. These registers are read-only and are updated by the ADC each time a temperature measurement is completed. The TMP435 contains circuitry to assure that a low byte register read command returns data from the same analog-to-digital (A/D) conversion as the immediately preceding high byte read command. This assurance remains valid only until another register is read. For proper operation, the high byte of a temperature register should be read first. The low byte register should be read in the next read command. The low byte register may be left unread if the LSBs are not needed. Alternatively, the temperature registers may be read as a 16-bit register by using a single two-byte read command from address 00h for the local channel result, or from address 01h for the remote channel result (23h for the second remote channel result). The high byte is output first, followed by the low byte. Both bytes of this read operation are from the same A/D conversion. The power-on reset value of both temperature registers is 00h. The local temperature high limit is obtained by reading the high byte from pointer address 05h and the low byte from pointer address 16h, or by using a two-byte read command from pointer address 05h. The power-on reset value of the local temperature high limit is 55h/00h (+85C in standard temperature mode; +21C in extended temperature mode). Similarly, the local temperature low limit is set by writing the high byte to pointer address 0Ch and writing the low byte to pointer address 17h, or by using a single two-byte write command to pointer address 0Ch. The local temperature low limit is read by reading the high byte from pointer address 06h and the low byte from pointer address 17h, or by using a two-byte read from pointer address 06h. The power-on reset value of the local temperature low limit register is 00h/00h (0C in standard temperature mode; -64C in extended mode). The remote temperature high limit for the TMP435 is set by writing the high byte to pointer address 0Dh and writing the low byte to pointer address 13h, or by using a two-byte write command to pointer address 0Dh. The remote temperature high limit is obtained by reading the high byte from pointer address 07h and the low byte from pointer address 13h, or by using a two-byte read command from pointer address 07h. The power-on reset value of the Remote Temperature High Limit Register is 55h/00h (+85C in standard temperature mode; +21C in extended temperature mode). The remote temperature low limit for the TMP435 is set by writing the high byte to pointer address 0Eh and writing the low byte to pointer address 14h, or by using a two-byte write to pointer address 0Eh. The remote temperature low limit is read by reading the high byte from pointer address 08h and the low byte from pointer address 14h, or by using a two-byte read from pointer address 08h. The power-on reset value of the Remote Temperature Low Limit Register is 00h/00h (0C in standard temperature mode; -64C in extended mode). Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 13 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com The TMP435 also has a THERM limit register for both the local and the remote channels. These are 8-bit registers and allow for THERM limits set to 1C resolution. The local channel THERM limit is set by writing to pointer address 20h. The remote channel THERM limit is set by writing to pointer address 19h. Status Register The local channel THERM limit is obtained by reading from pointer address 20h; the remote channel THERM limit is read by reading from pointer address 19h. The power-on reset value of the THERM limit registers is 55h (+85C in standard temperature mode; +21C in extended temperature mode). The THERM limit comparators also have hysteresis. The hysteresis of both comparators is set by writing to pointer address 21h. The hysteresis value is obtained by reading from pointer address 21h. The value in the Hysteresis Register is an unsigned number (always positive). The power-on reset value of this register is 0Ah (+10C). The BUSY bit reads as `1' if the ADC is making a conversion. It reads as `0' if the ADC is not converting. The TMP435 has a Status Register to report the state of the temperature comparators. Table 4 shows the Status Register bits. The Status Register is read-only and is read by reading from pointer address 02h. The OPEN bit reads as `1' if the remote transistor was detected as open since the last read of the Status Register. The OPEN status is only detected when the ADC attempts to convert a remote temperature. The RTHRM bit reads as `1' if the remote temperature has exceeded the remote THERM limit and remains greater than the remote THERM limit less the value in the shared Hysteresis Register; see Figure 20. Whenever changing between standard and extended temperature ranges, be aware that the temperatures stored in the temperature limit registers are NOT automatically reformatted to correspond to the new temperature range format. These values must be reprogrammed in the appropriate binary or extended binary format. The LTHRM bit reads as `1' if the local temperature has exceeded the local THERM limit and remains greater than the local THERM limit less the value in the shared Hysteresis Register; see Figure 20. Table 4. TMP435 Status Register Format TMP435 STATUS REGISTER (Read = 02h, Write = NA) BIT # BIT NAME POR VALUE (1) 14 D7 D6 D5 D4 D3 D2 D1 D0 BUSY LHIGH LLOW RHIGH RLOW OPEN RTHRM LTHRM 0 (1) 0 0 0 0 0 0 0 The BUSY bit changes to `1' almost immediately (<< 100ms) following power-up, as the TMP435 begins the first temperature conversion. It is high whenever the TMP435 is converting a temperature reading. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 The LHIGH and RHIGH bit values depend on the state of the AL/TH bit in the Configuration Register. If the AL/TH bit is `0', the LHIGH bit reads as `1' if the local high limit was exceeded since the last clearing of the Status Register. The RHIGH bit reads as `1' if the remote high limit was exceeded since the last clearing of the Status Register. If the AL/TH bit is `1', the remote high limit and the local high limit are used to implement a THERM2 function. LHIGH reads as `1' if the local temperature has exceeded the local high limit and remains greater than the local high limit less the value in the Hysteresis Register. The RHIGH bit reads as `1' if the remote temperature has exceeded the remote high limit and remains greater than the remote high limit less the value in the Hysteresis Register. The LLOW and RLOW bits are not affected by the AL/TH bit. The LLOW bit reads as `1' if the local low limit was exceeded since the last clearing of the Status Register. The RLOW bit reads as `1' if the remote low limit was exceeded since the last clearing of the Status Register. The values of the LLOW, RLOW, and OPEN (as well as LHIGH and RHIGH when AL/TH is `0') are latched and read as `1' until the Status Register is read or a device reset occurs. These bits are cleared by reading the Status Register, provided that the condition causing the flag to be set no longer exists. The values of BUSY, LTHRM, and RTHRM (as well as LHIGH and RHIGH when ALERT/THERM2 is `1') are not latched and are not cleared by reading the Status Register. They always indicate the current state, and are updated appropriately at the end of the corresponding A/D conversion. Clearing the Status Register bits does not clear the state of the ALERT pin; an SMBus alert response address command must be used to clear the ALERT pin. The TMP435 NORs, LHIGH, LLOW, RHIGH, RLOW, and OPEN, so a status change for any of these flags from `0' to `1' automatically causes the ALERT pin to go low (only applies when the ALERT/THERM2 pin is configured for ALERT mode). space space space space space Configuration Register 1 Configuration Register 1 sets the temperature range, controls shutdown mode, and determines how the ALERT/THERM2 pin functions. This Configuration Register is set by writing to pointer address 09h and read by reading from pointer address 03h. The MASK bit (bit 7) enables or disables the ALERT pin output if ALERT/THERM2 = 0. If ALERT/THERM2 = 1 then the MASK bit has no effect. If MASK is set to `0', the ALERT pin goes low when one of the temperature measurement channels exceeds its high or low limits for the chosen number of consecutive conversions. If the MASK bit is set to `1', the TMP435 retains the ALERT pin status, but the ALERT pin does not go low. The shutdown (SD) bit (bit 6) enables or disables the temperature measurement circuitry. lf SD = 0, the TMP435 converts continuously at the rate set in the conversion rate register. When SD is set to '1', the TMP435 immediately stops converting and enters a shutdown mode. When SD is set to '0' again, the TMP435 resumes continuous conversions. A single conversion can be started when SD = 1 by writing to the One-Shot Register. The AL/TH bit (bit 5) controls whether the ALERT pin functions in ALERT mode or THERM2 mode. If ALTH = 0, the ALERT pin operates as an interrupt pin. In this mode, the ALERT pin goes low after the set number of consecutive out-of-limit temperature measurements occur. If AL/TH = 1, the ALERT/THERM2 pin implements a THERM function (THERM2). In this mode, THERM2 functions similar to the THERM pin except that the local high limit and remote high limit registers are used for the thresholds. THERM2 goes low when either RHIGH or LHIGH is set. The temperature range is set by configuring bit 2 of Configuration Register 1. Setting this bit low configures the TMP435 for the standard measurement range (0C to +127C); temperature conversions are stored in the standard binary format. Setting bit 2 high configures the TMP435 for the extended measurement range (-55C to +150C); temperature conversions are stored in the extended binary format (see Table 1). The remaining bits of Configuration Register 1 are reserved and must always be set to `0'. The power-on reset value for this register is 00h. Table 5 summarizes the bits of Configuration Register 1. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 15 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com Table 5. Configuration Register 1 Bit Descriptions CONFIGURATION REGISTER 1 (Read = 03h, Write = 09h, POR = 00h) BIT NAME FUNCTION POWER-ON RESET VALUE 7 MASK 0 = ALERT Enabled 1 = ALERT Masked 0 6 SD 0 = Run 1 = Shut Down 0 5 AL/TH 0 = ALERT Mode 1 = THERM Mode 0 4, 3 Reserved -- 0 2 Temperature Range 0 = 0C to +127C 1 = -55C to +150C 0 1, 0 Reserved -- 0 Configuration Register 2 Configuration Register 2 (pointer address 1Ah) controls which temperature measurement channels are enabled and whether the external channels have the resistance correction feature enabled or not. The RC bit enables the resistance correction feature for the external temperature channels. If RC = '1', series resistance correction is enabled; if RC = '0', resistance correction is disabled. Resistance correction should be enabled for most applications. However, disabling the resistance correction may yield slightly improved temperature measurement noise performance, and reduce conversion time by about 50%, which could lower power consumption when conversion rates of two per second or less are selected. The LEN bit enables the local temperature measurement channel. If LEN = '1', the local channel is enabled; if LEN = '0', the local channel is disabled. The REN bit enables external temperature measurement channel 1 (connected to pins 1 and 2.) If REN = '1', the external channel is enabled; if REN = '0', the external channel is disabled. The temperature measurement sequence is local channel, external channel 1, shutdown, and delay (to set conversion rate, if necessary). The sequence starts over with the local channel. If any of the channels are disabled, they are skipped in the sequence. Table 6 summarizes the bits of Configuration Register 2. space Table 6. Configuration Register 2 Bit Descriptions CONFIGURATION REGISTER 2 (Read/Write = 1A, POR = 1Ch) 16 BIT NAME FUNCTION POWER-ON RESET VALUE 7, 6, 5 Reserved -- 0 4 REN 0 = External channel 1 disabled 1 = External channel 1 enabled 1 3 LEN 0 = Local channel disabled 1 = Local channel enabled 1 2 RC 0 = Resistance correction disabled 1 = Resistance correction enabled 1 1, 0 Reserved -- 0 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 Conversion Rate Register The Conversion Rate Register (pointer address 0Ah) controls the rate at which temperature conversions are performed. This register adjusts the idle time between conversions but not the conversion timing itself, thereby allowing the TMP435 power dissipation to be balanced with the temperature register update rate. Table 7 shows the conversion rate options and corresponding current consumption. Beta Compensation Configuration Register If the Beta Compensation Configuration Register is set to '1xxx' (beta correction enabled) for a given channel at the beginning of each temperature conversion, the TMP435 automatically detects if the sensor is diode-connected or GND collector-connected, selects the proper beta range, and measures the sensor temperature appropriately. If the Beta Compensation Configuration Register is set to '0111' (beta correction disabled) for a given channel, the automatic detection is bypassed and the temperature is measured assuming a diode-connected sensor. A PNP transistor may continue to be GND collector-connected in this mode, but no beta compensation factor is applied. When the beta correction is set to '0111' or the sensor is diode-connected (base shorted to collector), the n-factor used by the TMP435 is 1.008. When the beta correction configuration is set to '1xxx' (beta correction enabled) and the sensor is GND collector-connected (PNP collector to ground), the n-factor used by the TMP435 is 1.000. Table 8 shows the read value for the selected beta ranges and the appropriate n-factor used for each conversion. Table 7. Conversion Rate Register CONVERSION RATE REGISTER (Read = 04h, Write = 0Ah, POR = 07h) AVERAGE IQ (TYP) (mA) R7 R6 R5 R4 R3 R2 R1 R0 CONVERSION/SEC 0 0 0 0 0 0 0 0 0.0625 11 32 0 0 0 0 0 0 0 1 0.125 17 38 0 0 0 0 0 0 1 0 0.25 28 49 0 0 0 0 0 0 1 1 0.5 47 69 0 0 0 0 0 1 0 0 1 80 103 0 0 0 0 0 1 0 1 2 128 155 0 0 0 0 0 1 1 0 4 190 220 8 373 413 07h to 0Fh VS = 2.7V VS = 5.5V Table 8. Beta Compensation Configuration Register BCx3-BCx0 n-FACTOR TIME 1000 Automatically selected range 0 (0.10 < beta < 0.18) BETA RANGE DESCRIPTION 1.000 126ms 1001 Automatically selected range 1 (0.16 < beta < 0.26) 1.000 126ms 1010 Automatically selected range 2 (0.24 < beta < 0.43) 1.000 126ms 1011 Automatically selected range 3 (0.35 < beta < 0.78) 1.000 126ms 1100 Automatically selected range 4 (0.64 < beta < 1.8) 1.000 126ms 1101 Automatically selected range 5 (1.4 < beta < 9.0) 1.000 126ms 1110 Automatically selected range 6 (6.7 < beta < 40.0) 1.000 126ms 1111 Automatically selected range 7 (beta > 27.0) 1.000 126ms 1111 Automatically detected diode connected sensor 1.008 93ms 0000 Manually selected range 0 (0.10 < beta < 0.5) 1.000 93ms 0001 Manually selected range 1 (0.13 < beta < 1.0) 1.000 93ms 0010 Manually selected range 2 (0.18 < beta < 2.0) 1.000 93ms 0011 Manually selected range 3 (0.3 < beta < 25) 1.000 93ms 0100 Manually selected range 4 (0.5 < beta < 50) 1.000 93ms 0101 Manually selected range 5 (1.1 < beta < 100) 1.000 93ms 0110 Manually selected range 6 (2.4 < beta < 150) 1.000 93ms 0111 Manually disabled beta correction 1.008 93ms Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 17 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com n-Factor Correction Register The TMP435 allows for a different n-factor value to be used for converting remote channel measurements to temperature. The remote channel uses sequential current excitation to extract a differential VBE voltage measurement to determine the temperature of the remote transistor. Equation 1 relates this voltage and temperature. I2 nkT VBE2 - VBE1 = ln q I1 (1) ( ) The value n in Equation 1 is a characteristic of the particular transistor used for the remote channel. When the beta compensation configuration is set to '0111' (beta compensation disabled) or the sensor is diode-connected (base shorted to collector), the n-factor used by the TMP435 is 1.008. When the beta compensation configuration is set to '1000' (beta compensation enabled) and the sensor is GND collector-connected (PNP collector to ground), the n-factor used by the TMP435 is 1.000. If the n-factor used for the temperature conversion does not match the characteristic of the sensor, then temperature offset is observed. The value in the n-Factor Correction Register may be used to adjust the effective n-factor according to Equation 2 and Equation 3 for disabled beta compensation or a diode-connected sensor. Equation 4 and Equation 5 may be used for enabled beta compensation and a GND collector-connected sensor. 1.008 300 neff = 300 - NADJUST (2) NADJUST = 300 - 300 1.008 neff 1.000 300 neff = 300 - NADJUST NADJUST = 300 - 300 1.000 neff (3) (4) (5) The n-correction value must be stored in twos-complement format, yielding an effective data 18 range from -128 to +127. Table 9 shows the n-factor range for both 1.008 and 1.000. For the TMP435, the n-correction value may be written to and read from pointer address 18h. The register power-on reset value is 00h, thus having no effect unless written to. Table 9. n-Factor Range NADJUST BINARY HEX DECIMAL n-FACTOR 01111111 7F 127 1.747977 00001010 0A 10 1.042759 00001000 08 8 1.035616 00000110 06 6 1.028571 00000100 04 4 1.021622 00000010 02 2 1.014765 00000001 01 1 1.011371 00000000 00 0 1.008 11111111 FF -1 1.004651 11111110 FE -2 1.001325 11111100 FC -4 0.994737 11111010 FA -6 0.988235 11111000 F8 -8 0.981818 11110110 F6 -10 0.975484 10000000 80 -128 0.706542 space Software Reset The TMP435 may be reset by writing any value to Pointer Register FCh. This action restores the power-on reset state to all of the TMP435 registers as well as abort any conversion in process and clear the ALERT and THERM pins. The TMP435 also supports reset via the two-wire general call address (00000000). The TMP435 acknowledges the general call address and responds to the second byte. If the second byte is 00000110, the TMP435 executes a software reset. The TMP435 does not respond to other values in the second byte. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 Consecutive Alert Register does not trip on the measured temperature falling edges. Allowable hysteresis values are shown in Table 11. The default hysteresis value is 10C, whether the device is operating in the standard or extended mode setting. The value in the Consecutive Alert Register (address 22h) determines how many consecutive out-of-limit measurements must occur on a measurement channel before the ALERT/THERM2 or the THERM signal is activated. The value in this register does not affect bits in the Status Register. Values of one, two, three, or four consecutive conversions can be selected; one conversion is the default. This function allows additional filtering for the ALERT/THERM2 or the THERM pin. Table 13 shows the consecutive alert bits. For bit descriptions, refer to Table 10. Identification Registers The TMP435 allows for the two-wire bus controller to query the device for manufacturer and device IDs to enable the device for software identification of the device at the particular two-wire bus address. The manufacturer ID is obtained by reading from pointer address FEh. The TMP435 returns 55h for the manufacturer code. The device ID is obtained by reading from pointer address FDh. The TMP435 returns 31h for the device ID (see Table 3). These registers are read-only. Table 10. Consecutive Alert Register Bit Descriptions BIT NAME NUMBER OF CONSECUTIVE OUT-OF-LIMIT MEASUREMENTS CALT2/CTH2 CALT1/CTH1 CALT0/CTH0 (ALERT/THERM) 0 0 0 1 0 0 1 2 0 1 1 1 1 1 Table 11. Allowable THERM Hysteresis Values THERM HYSTERESIS VALUE 3 TEMPERATURE (C) TH[7:0] (STANDARD BINARY) (HEX) 4 0 0000 0000 00 1 0000 0001 01 5 0000 0101 05 10 0000 1010 0A 25 0001 1001 19 50 0011 0010 32 4B space. Therm Hysteresis Register The THERM Hysteresis Register, shown in Table 12, stores the hysteresis value used for the THERM pin alarm function and for the ALERT/THERM2 pin when the AL/TH is 1. This register must be programmed with a value that is less than the Local Temperature High Limit Register value, Remote Temperature High Limit Register value, Local THERM Limit Register value, or Remote THERM Limit Register value; otherwise, the respective temperature comparator 75 0100 1011 100 0110 0100 64 125 0111 1101 7D 127 0111 1111 7F 150 1001 0110 96 175 1010 1111 AF 200 1100 1000 C8 225 1110 0001 E1 255 1111 1111 FF Table 12. THERM Hysteresis Register Format THERM HYSTERESIS REGISTER (Read = 21h, Write = 21h, POR = 0Ah) BIT # BIT NAME POR VALUE D7 D6 D5 D4 D3 D2 D1 D0 TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0 0 0 0 0 1 0 1 0 Table 13. Consecutive Alert Register Format CONSECUTIVE ALERT REGISTER (READ = 22h, WRITE = 22h, POR = 70h) BIT # D7 D6 D5 D4 D3 D2 D1 D0 BIT NAME 0 CTH2 CTH1 CTH0 CALT2 CALT1 CALT0 0 POR VALUE 0 1 1 1 0 0 0 0 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 19 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com Bus Overview Two-Wire Interface Slave Device Addresses The TMP435 is SMBus interface-compatible. In SMBus protocol, the device that initiates the transfer is called a master, and the devices controlled by the master are slaves. The bus must be controlled by a master device that generates the serial clock (SCL), controls the bus access, and generates the START and STOP conditions. The TMP435 supports nine slave device addresses and is available in two different fixed serial interface addresses. To address a specific device, a START condition is initiated. START is indicated by pulling the data line (SDA) from a high to low logic level while SCL is high. All slaves on the bus shift in the slave address byte, with the last bit indicating whether a read or write operation is intended. During the ninth clock pulse, the slave being addressed responds to the master by generating an Acknowledge and pulling SDA low. Data transfer is then initiated and sent over eight clock pulses followed by an Acknowledge bit. During data transfer SDA must remain stable while SCL is high, because any change in SDA while SCL is high is interpreted as a control signal. Once all data have been transferred, the master generates a STOP condition. STOP is indicated by pulling SDA from low to high, while SCL is high. Serial Interface The TMP435 operates only as a slave device on either the two-wire bus or the SMBus. Connections to either bus are made via the open-drain I/O lines, SDA and SCL. The SDA and SCL pins feature integrated spike suppression filters and Schmitt triggers to minimize the effects of input spikes and bus noise. The TMP435 supports the transmission protocol for fast (1kHz to 400kHz) and high-speed (1kHz to 3.4MHz) modes. All data bytes are transmitted MSB first. Serial Bus Address To communicate with the TMP435, the master must first address slave devices via a slave address byte. The slave address byte consists of seven address bits, and a direction bit indicating the intent of executing a read or write operation. The address of the TMP435 is 4Ch (1001100b). 20 The A1 and A0 pins, as summarized in Table 14), set the slave device address for the TMP435. Table 14. Two-Wire Addresses A0 A1 ADDRESS 0 0 1001 100 0 1 1001 101 1 0 1001 110 1 1 1001 111 0 Z 1001 000 Z 0 1001 001 1 Z 1001 010 Z 1 1001 011 Z Z 0110 111 Read/Write Operations Accessing a particular register on the TMP435 is accomplished by writing the appropriate value to the Pointer Register. The value for the Pointer Register is the first byte transferred after the slave address byte with the R/W bit low. Every write operation to the TMP435 requires a value for the Pointer Register (see Figure 16). When reading from the TMP435, the last value stored in the Pointer Register by a write operation is used to determine which register is read by a read operation. To change the register pointer for a read operation, a new value must be written to the Pointer Register. This transaction is accomplished by issuing a slave address byte with the R/W bit low, followed by the Pointer Register byte. No additional data are required. The master can then generate a START condition and send the slave address byte with the R/W bit high to initiate the read command. See Figure 17 for details of this sequence. If repeated reads from the same register are desired, it is not necessary to continually send the Pointer Register bytes, because the TMP435 retains the Pointer Register value until it is changed by the next write operation. Note that register bytes are sent MSB first, followed by the LSB. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 TIMING DIAGRAMS The TMP435 is two-wire and SMBus-compatible. Figure 15 to Figure 19 describe the various operations on the TMP435. Bus definitions are given below. Parameters for Figure 15 are defined in Table 15. Bus Idle: Both SDA and SCL lines remain high. Start Data Transfer: A change in the state of the SDA line, from high to low, while the SCL line is high, defines a START condition. Each data transfer is initiated with a START condition. Stop Data Transfer: A change in the state of the SDA line from low to high while the SCL line is high defines a STOP condition. Each data transfer terminates with a STOP or a repeated START condition. t(LOW) Data Transfer: The number of data bytes transferred between a START and a STOP condition is not limited and is determined by the master device. The receiver acknowledges the transfer of data. Acknowledge: Each receiving device, when addressed, is obliged to generate an Acknowledge bit. A device that acknowledges must pull down the SDA line during the Acknowledge clock pulse in such a way that the SDA line is stable low during the high period of the Acknowledge clock pulse. Setup and hold times must be taken into account. On a master receive, data transfer termination can be signaled by the master generating a Not-Acknowledge on the last byte that has been transmitted by the slave. tF tR t(HDSTA) SCL t(HDSTA) t(HIGH) t(HDDAT) t(SUSTO) t(SUSTA) t(SUDAT) SDA t(BUF) P S S P Figure 15. Two-Wire Timing Diagram Table 15. Timing Diagram Definitions for Figure 15 FAST MODE PARAMETER HIGH-SPEED MODE MIN MAX MIN MAX UNITS 0.4 0.001 3.4 MHZ SCL Operating Frequency f(SCL) 0.001 Bus Free Time Between STOP and START Condition t(BUF) 600 160 Hold time after repeated START condition. After this period, the first clock is generated. t(HDSTA) 100 100 ns Repeated START Condition Setup Time t(SUSTA) 100 100 ns STOP Condition Setup Time t(SUSTO) 100 100 ns Data Hold Time t(HDDAT) 0 (1) 0 (2) ns Data Setup Time t(SUDAT) 100 10 ns SCL Clock LOW Period t(LOW) 1300 160 ns SCL Clock HIGH Period t(HIGH) 600 60 Clock/Data Fall Time Clock/Data Rise Time for SCLK 100kHz (1) (2) tF tR ns ns 300 160 ns 300 160 ns 1000 ns For cases with fall time of SCL less than 20ns and/or the rise time or fall time of SDA less than 20ns, the hold time should be greater than 20ns. For cases with fall time of SCL less than 10ns and/or the rise or fall time of SDA less than 10ns, the hold time should be greater than 10ns. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 21 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com 1 9 9 1 SCL 1/4 1 SDA 0 0 1 1 0 0(1) P7 R/W Start By Master P6 P5 P4 P3 P2 P1 P0 ACK By TMP435 Frame 2 Pointer Register Byte Frame 1 Two- Wire Slave Address Byte 9 1 1/4 ACK By TMP435 1 9 SCL (Continued) SDA (Continued) D6 D7 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0 ACK By TMP435 ACK By TMP435 Stop By Master Frame 4 Data Byte 2 Frame 3 Data Byte 1 NOTE (1): Slave address 1001100 (TMP435) shown. See Ordering Information table for more details. Figure 16. Two-Wire Timing Diagram for Write Word Format 1 9 1 9 SCL SDA 1 0 0 1 1 0 0(1) R/W Start By Master P7 P6 P5 P4 P3 P2 P1 P0 ACK By TMP435 ACK By TMP435 Frame 1 Two-Wire Slave Address Byte 1 Frame 2 Pointer Register Byte 9 1 9 SCL (Continued) SDA (Continued) 1 0 0 1 1 0 0(1) R/W Start By Master D7 D6 D5 D4 ACK By TMP435 Frame 3 Two-Wire Slave Address Byte D3 D2 D1 D0 From TMP435 NACK By Master(2) Frame 4 Data Byte 1 Read Register NOTES: (1) Slave address 1001100 (TMP435) shown. See Ordering Information table for more details. (2) Master should leave SDA high to terminate a single-byte read operation. Figure 17. Two-Wire Timing Diagram for Single-Byte Read Format 22 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 1 9 1 9 SCL SDA 0 1 0 1 1 0(1) 0 R/W P7 Start By Master P6 P5 P4 P3 P2 P1 P0 ACK By TMP435 ACK By TMP435 Frame 1 Two-Wire Slave Address Byte Frame 2 Pointer Register Byte 1 9 1 9 SCL (Continued) SDA (Continued) 1 0 0 1 1 0(1) 0 D7 R/W Start By Master D6 D5 D4 D3 ACK By TMP435 D1 D0 From TMP435 Frame 3 Two-Wire Slave Address Byte 1 D2 ACK By Master Frame 4 Data Byte 1 Read Register 9 SCL (Continued) SDA (Continued) D7 D6 D5 D4 D3 D2 D1 D0 From TMP435 NACK By Master(2) Stop By Master Frame 5 Data Byte 2 Read Register NOTES: (1) Slave address 1001100 (TMP435) shown. See Ordering Information table for more details. (2) Master should leave SDA high to terminate a two-byte read operation. Figure 18. Two-Wire Timing Diagram for Two-Byte Read Format ALERT 1 9 1 9 SCL SDA 0 0 0 1 Start By Master 1 0 0 1 R/W 0 0 1 1 0 ACK By TMP435 Frame 1 SMBus ALERT Response Address Byte 0 (1) From TMP435 Status NACK By Master Stop By Master Frame 2 Slave Address Byte NOTE (1): Slave address 1001100 (TMP435) shown. See Ordering Information table for more details. Figure 19. Timing Diagram for SMBus ALERT Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 23 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com High-Speed Mode In order for the two-wire bus to operate at frequencies above 400kHz, the master device must issue a High-speed mode (Hs-mode) master code (00001XXX) as the first byte after a START condition to switch the bus to high-speed operation. The TMP435 does not acknowledge this byte, but switches the input filters on SDA and SCL and the output filter on SDA to operate in Hs-mode, allowing transfers at up to 3.4MHz. After the Hs-mode master code has been issued, the master transmits a two-wire slave address to initiate a data transfer operation. The bus continues to operate in Hs-mode until a STOP condition occurs on the bus. Upon receiving the STOP condition, the TMP435 switches the input and output filter back to fast-mode operation. Timeout Function The serial interface of the TMP435 resets if either SCL or SDA are held low for 32ms (typical) between a START and STOP condition. If the TMP435 is holding the bus low, it releases the bus and waits for a START condition. THERM and ALERT/THERM2 The TMP435 has two pins dedicated to alarm functions, the THERM and ALERT/THERM2 pins. Both pins are open-drain outputs that each require a pull-up resistor to V+. These pins can be wire-ORed together with other alarm pins for system monitoring of multiple sensors. The THERM pin provides a thermal interrupt that cannot be software disabled. The ALERT pin is intended for use as an earlier warning interrupt, and can be software disabled, or masked. The ALERT/THERM2 pin can also be configured for use as THERM2, a second THERM pin (Configuration Register: AL/TH bit = 1). The default setting configures pin 6 for the TMP435 to function as ALERT (AL/TH = 0). The THERM pin asserts low when either the measured local or remote temperature is outside of the temperature range programmed in the corresponding Local/Remote THERM Limit Register. The THERM temperature limit range can be programmed with a wider range than that of the limit registers, which allows ALERT to provide an earlier warning than THERM. The THERM alarm resets automatically when the measured temperature returns to within the THERM temperature limit range 24 minus the hysteresis value stored in the THERM Hysteresis Register. The allowable values of hysteresis are shown in Table 11. The default hysteresis is 10C. When the ALERT/THERM2 pin is configured as a second thermal alarm (Configuration Register: bit 7 = x, bit 5 = 1), it functions the same as THERM, but uses the temperatures stored in the Local/Remote Temperature High Limit Registers to set its comparison range. When ALERT/THERM2 is configured as ALERT (Configuration Register: bit 7 = 0, bit 5 = 0), the pin asserts low when either the measured local or remote temperature violates the range limit set by the corresponding Local/Remote Temperature High/Low Limit Registers. This alert function can be configured to assert only if the range is violated a specified number of consecutive times (1, 2, 3, or 4). The consecutive violation limit is set in the Consecutive Alert Register. False alerts that occur as a result of environmental noise can be prevented by requiring consecutive faults. ALERT also asserts low if the remote temperature sensor is open-circuit. When the MASK function is enabled (Configuration Register 1: bit 7 = 1), ALERT is disabled (that is, masked). ALERT resets when the master reads the device address, as long as the condition that caused the alert no longer persists, and the Status Register has been reset. SMBus Alert Function The TMP435 supports the SMBus Alert function. When pin 6 is configured as an alert output, the ALERT pin of the TMP435 may be connected as an SMBus Alert signal. When a master detects an alert condition on the ALERT line, the master sends an SMBus Alert command (00011001) on the bus. If the ALERT pin of the TMP435 is active, the devices acknowledge the SMBus Alert command and respond by returning its slave address on the SDA line. The eighth bit (LSB) of the slave address byte indicates whether the temperature exceeding one of the temperature high limit settings or falling below one of the temperature low limit settings caused the alert condition. This bit is high if the temperature is greater than or equal to one of the temperature high limit settings; this bit is low if the temperature is less than one of the temperature low limit settings. See Figure 20 for details of this sequence. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 THERM Limit and ALERT High Limit Measured Temperature ALERT Low Limit and THERM Limit Hysteresis THERM ALERT SMBus ALERT Read Read Read Time Figure 20. SMBus Alert Timing Diagram space If multiple devices on the bus respond to the SMBus Alert command, arbitration during the slave address portion of the SMBus Alert command determines which device must clear its alert status. If the TMP435 wins the arbitration, its ALERT pin becomes inactive at the completion of the SMBus Alert command. If the TMP435 loses the arbitration, the ALERT pin remains active. Shutdown Mode (SD) The TMP435 shutdown mode allows the user to save maximum power by shutting down all device circuitry other than the serial interface, reducing current consumption to typically less than 3A; see the typical characteristic graph, Shutdown Quiescent Current vs Supply Voltage (Figure 6). Shutdown mode is enabled when the SD bit of the Configuration Register 1 is high; the device shuts down immediately, aborting the current conversion. When SD is low, the device maintains a continuous conversion state. Sensor Fault The TMP435 can sense a fault at the DXP input that results from incorrect diode connection or an open circuit. The detection circuitry consists of a voltage comparator that trips when the voltage at DXP exceeds (V+) - 0.6V (typical). The comparator output is continuously checked during a conversion. If a fault is detected, the last valid measured temperature is used for the temperature measurement result, the OPEN bit (Status Register, bit 2) is set high, and, if the alert function is enabled, ALERT asserts low. When not using the remote sensor with the TMP435, the DXP and DXN inputs must be connected together to prevent meaningless fault warnings. Under-Voltage Lockout The TMP435 senses when the power-supply voltage has reached a minimum voltage level for the ADC to function. The detection circuitry consists of a voltage comparator that enables the ADC after the power supply (V+) exceeds 2.45V (typical). The comparator output is continuously checked during a conversion. The TMP435 does not perform a temperature conversion if the power supply is not valid. The last valid measured temperature is used for the temperature measurement result. General Call Reset The TMP435 supports reset via the Two-Wire General Call address 00h (0000 0000b). The TMP435 acknowledges the General Call address and responds to the second byte. If the second byte is 06h (0000 0110b), the TMP435 executes a software reset. This software reset restores the power-on reset state to all TMP435 registers, aborts any conversion in progress, and clears the ALERT and THERM pins. The TMP435 takes no action in response to other values in the second byte. Filtering Remote junction temperature sensors are usually implemented in a noisy environment. Noise is frequently generated by fast digital signals and if not filtered properly will induce errors that can corrupt temperature measurements. The TMP435 has a built-in 65kHz filter on the inputs of DXP and DXN to minimize the effects of noise. However, a differential low-pass filter can help attenuate unwanted coupled signals. Exact component values are application-specific. It is also recommended that the capacitor value remains between 0pF to 2200pF with a series resistance less than 1k. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 25 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com Remote Sensing The TMP435 is designed to be used with either discrete transistors or substrate transistors built into processor chips and ASICs. Either NPN- or PNP-type transistors can be used, as long as the base-emitter junction is used as the remote temperature sense. NPN transistors must be diode-connected. PNP transistors can either be transistoror diode-connected (see Figure 13). Errors in remote temperature sensor readings are typically the consequence of the ideality factor and current excitation used by the TMP435 versus the manufacturer-specified operating current for a given transistor. Some manufacturers specify a high-level and low-level current for the temperature-sensing substrate transistors. The TMP435 uses 6mA for ILOW and 120mA for IHIGH. The device allows for different n-factor values; see the N-Factor Correction Register section. The ideality factor (n) is a measured characteristic of a remote temperature sensor diode as compared to an ideal diode. The ideality factor for the TMP435 is trimmed to be 1.008. For transistors whose ideality factor does not match the TMP435, Equation 6 can be used to calculate the temperature error. Note that for the equation to be used correctly, actual temperature (C) must be converted to Kelvin (K). n - 1.008 TERR = [273.15 + T(C)] 1.008 ) ( Where: * * * n = Ideality factor of remote temperature sensor T(C) = actual temperature TERR = Error in TMP435 reading because n 1.008 Degree delta is the same for C and K (6) * For n = 1.004 and T(C) = 100C: 1.004 - 1.008 TERR = (273.15 + 100C) 1.008 ( ) TERR = 1.48C (7) If a discrete transistor is used as the remote temperature sensor with the TMP435, the best accuracy can be achieved by selecting the transistor according to the following criteria: 1. Base-emitter voltage > 0.25V at 6mA, at the highest sensed temperature. 2. Base-emitter voltage < 0.95V at 120mA, at the lowest sensed temperature. 26 3. Base resistance < 100. 4. Tight control of VBE characteristics indicated by small variations in hFE (that is, 50 to 150). Based on these criteria, two recommended small-signal transistors are the 2N3904 (NPN) or 2N3906 (PNP). Measurement Accuracy and Thermal Considerations The temperature measurement accuracy of the TMP435 depends on the remote and/or local temperature sensor being at the same temperature as the system point being monitored. Clearly, if the temperature sensor is not in good thermal contact with the part of the system being monitored, then there is a delay in the response of the sensor to a temperature change in the system. For remote temperature sensing applications using a substrate transistor (or a small, SOT23 transistor) placed close to the device being monitored, this delay is usually not a concern. The local temperature sensor inside the TMP435 monitors the ambient air around the device. The thermal time constant for the TMP435 is approximately two seconds. This constant implies that if the ambient air changes quickly by 100C, it would take the TMP435 about 10 seconds (that is, five thermal time constants) to settle to within 1C of the final value. In most applications, the TMP435 package is in thermal contact with the PCB, as well as subjected to forced airflow. The accuracy of the measured temperature directly depends on how accurately the PCB and forced airflow temperatures represent the temperature that the TMP435 is measuring. Additionally, the internal power dissipation of the TMP435 can cause the temperature to rise above the ambient or PCB temperature. The internal power dissipated as a result of exciting the remote temperature sensor is negligible because of the small currents used. For a 5.5V supply and maximum conversion rate of eight conversions per second, the TMP435 dissipates 1.82mW (PDIQ = 5.5V x 330mA). If both the ALERT/THERM2 and THERM pins are each sinking 1mA, an additional power of 0.8mW is dissipated (PDOUT = 1mA x 0.4V + 1mA x 0.4V = 0.8mW). Total power dissipation is then 2.62mW (PDIQ + PDOUT) and, with a qJA of 165C/W, causes the junction temperature to rise approximately 0.432C above the ambient. Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 TMP435 www.ti.com SBOS495A - MARCH 2010 - REVISED APRIL 2010 Layout Considerations Remote temperature sensing on the TMP435 measures very small voltages using very low currents; therefore, noise at the IC inputs must be minimized. Most applications using the TMP435 have high digital content, with several clocks and logic level transitions creating a noisy environment. Layout should adhere to the following guidelines: 1. Place the TMP435 as close to the remote junction sensor as possible. 2. Route the DXP and DXN traces next to each other and shield them from adjacent signals through the use of ground guard traces, as shown in Figure 21. If a multilayer PCB is used, bury these traces between ground or VDD planes to shield them from extrinsic noise sources. 5 mil (0,127 mm) PCB traces are recommended. 3. Minimize additional thermocouple junctions caused by copper-to-solder connections. If these junctions are used, make the same number and approximate locations of copper-to-solder connections in both the DXP and DXN connections to cancel any thermocouple effects. 4. Use a 0.1mF local bypass capacitor directly between the V+ and GND of the TMP435. Figure 22 shows the suggested bypass capacitor placement for the TMP435. Minimize filter capacitance between DXP and DXN to 2200pF or less for optimum measurement performance. This capacitance includes any cable capacitance between the remote temperature sensor and TMP435. 5. If the connection between the remote temperature sensor and the TMP435 is less than 8 inches (20,32 cm), use a twisted-wire pair connection. Beyond 8 inches, use a twisted, shielded pair with the shield grounded as close to the TMP435 as possible. Leave the remote sensor connection end of the shield wire open to avoid ground loops and 60Hz pickup. 6. Thoroughly clean and remove all flux residue in and around the pins of the TMP435 to avoid temperature offset readings as a result of leakage paths between DXP or DXN and GND, or between DXP or DXN and V+. V+ DXP Ground or V+ layer on bottom and/or top, if possible. DXN GND Note: Use 5mil (.005in, or 0,127mm) traces with 5mil spacing. Figure 21. Example Signal Traces 0.1mF Capacitor V+ GND PCB Via 1 10 DXP 2 9 DXN 3 8 A0 4 7 A1 5 6 PCB Via TMP435 Figure 22. Suggested Bypass Capacitor Placement Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 27 TMP435 SBOS495A - MARCH 2010 - REVISED APRIL 2010 www.ti.com REVISION HISTORY NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Original (March, 2010) to Revision A Page * Changed typo in second paragraph of Beta Compensation Configuration Register section to clarify state of beta correction ............................................................................................................................................................................ 17 * Corrected POR value in Table 7 ......................................................................................................................................... 17 * Corrected Equation 7 .......................................................................................................................................................... 26 28 Submit Documentation Feedback Copyright (c) 2010, Texas Instruments Incorporated Product Folder Link(s): TMP435 PACKAGE OPTION ADDENDUM www.ti.com 9-Apr-2010 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty TMP435ADGSR ACTIVE MSOP DGS 10 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR TMP435ADGST ACTIVE MSOP DGS 10 250 CU NIPDAU Level-2-260C-1 YEAR Green (RoHS & no Sb/Br) Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. 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Addendum-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TMP435ADGSR MSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TMP435ADGSR MSOP DGS 10 2500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TMP435ADGST MSOP DGS 10 250 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 TMP435ADGST MSOP DGS 10 250 177.8 12.4 5.3 3.4 1.4 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TMP435ADGSR MSOP DGS 10 2500 366.0 364.0 50.0 TMP435ADGSR MSOP DGS 10 2500 358.0 335.0 35.0 TMP435ADGST MSOP DGS 10 250 366.0 364.0 50.0 TMP435ADGST MSOP DGS 10 250 202.0 201.0 28.0 Pack Materials-Page 2 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46C and to discontinue any product or service per JESD48B. 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