M TC74 Tiny Serial Digital Thermal Sensor Features General Description * Digital Temperature Sensing in SOT-23-5 or TO-220 Packages * Outputs Temperature as an 8-Bit Digital Word * Simple SMBus/I2CTM Serial Port Interface * Solid-State Temperature Sensing: - 2C (max.) Accuracy from +25C to +85C - 3C (max.) Accuracy from 0C to +125C * Supply Voltage of 2.7V to 5.5V * Low Power: - 200 A (typ.) Operating Current - 5 A (typ.) Standby Mode Current The TC74 is a serially accessible, digital temperature sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word. Applications * Thermal Protection for Hard Disk Drives and other PC Peripherals * PC Card Devices for Notebook Computers * Low Cost Thermostat Controls * Power Supplies * Thermistor Replacement Package Types Communication with the TC74 is accomplished via a 2wire SMBus/I2C compatible serial port. This bus also can be used to implement multi-drop/multi-zone monitoring. The SHDN bit in the CONFIG register can be used to activate the low power Standby mode. Temperature resolution is 1C. Conversion rate is a nominal 8 samples/sec. During normal operation, the quiescent current is 200 A (typ). During standby operation, the quiescent current is 5 A (typ). Small size, low installed cost and ease of use make the TC74 an ideal choice for implementing thermal management in a variety of systems. Functional Block Diagram Internal Sensor (Diode) TO-220 SOT-23 SDA SCLK 5 4 SCLK Modulator TC74 Control Logic TC74 123 45 NC SDA GND SCLK VDD SDA Serial Port Interface 1 2 3 NC GND VDD Temperature Register Note: The TO-220 tab is connected to pin 3 (GND) 2002 Microchip Technology Inc. DS21462C-page 1 TC74 1.0 ELECTRICAL CHARACTERISTICS 1.1 Absolute Maximum Ratings Supply Voltage (VDD) ............................................ +6V Voltage On Any Pin ....... (GND - 0.3V) to (VDD + 0.3V) Current On Any Pin .......................................... 50 mA Notice: Stresses above those listed under "Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at those or any other conditions above those indicated in the operation listings of this specification is not implied. Exposure to maximum rating conditions for extended periods may affect device reliability. Operating Temperature (TA) ........ -40C TA +125C Storage Temperature (TSTG) .............. -65C to +150C Junction Temperature (TJ)................................ +150C DC CHARACTERISTICS Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TC74AX-5.0VXX, -40C TA 125C. Note 5 Parameters Sym Min Typ Max Units Conditions Power-on Reset Threshold VPOR 1.2 -- 2.2 V VDD Falling Edge or Rising Edge Supply Voltage VDD 2.7 -- 5.5 V Note 5 Operating Current IDD -- 200 350 A VDD = 5.5V, Note 1 IDD-STANDBY -- 5.0 10 A VDD = 3.3V Serial Port Inactive, Note 4 TERR -2.0 -3.0 -- -- -- 2.0 +2.0 +3.0 -- C +25C <TA < +85C 0C < TA < +125C -40C < TA < 0C CR 4 8 -- SPS VIH 0.8 x VDD -- -- V Logic Input Low VIL -- -- 0.2 x V DD V SDA Output Low VOL -- -- -- -- 0.4 0.6 V V Power Supply Standby Supply Current Temperature-to-Bits Converter Temperature Accuracy Conversion Rate Note 2 Serial Port Interface Logic Input High Input Capacitance SDA, SCLK IOL = 3 mA IOL = 6 mA, Note 3 CIN -- 5.0 -- pF ILEAK -1.0 0.1 1.0 A fSMB 10 -- 100 kHz Low Clock Period tLOW 4.7 -- -- sec 10% to 10% High Clock Period tHIGH 4.0 -- -- sec 90% to 90% I/O Leakage Serial Port AC Timing (CLOAD = 80 pF) SMBus/I2C Clock Frequency Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1C/V of V DD change. DS21462C-page 2 2002 Microchip Technology Inc. TC74 DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise noted, VDD = 3.3V for TC74AX-3.3VXX and VDD = 5.0V for TC74AX-5.0VXX, -40C TA 125C. Note 5 Parameters Sym Min Typ Max Units tR tF -- -- -- -- 1000 300 nsec nsec 10% to 90% 90% to10% START Condition Setup Time (for repeated START Condition) tSU(START) 4.0 -- -- sec 90% SCLK to 10% SDA START Condition Hold Time tH(START) 4.0 -- -- sec Data In Setup Time tSU-DATA 1000 -- -- nsec -- -- nsec 2 SMBus/I C Rise Time SMBus/I2C Fall Time tH-DAT 1250 STOP Condition Setup Time tSU(STOP) 4.0 -- -- sec Bus Free Time Prior to New Transition tIDLE 4.7 -- -- sec Power-on Reset Delay tPOR -- 500 -- sec Data In Hold Time Conditions VDD VPOR (Rising Edge) Note 1: Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. 2: Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. 3: Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. 4: SDA and SCLK must be connected to VDD or GND. 5: VDD = 3.3V for TC74AX -3.3 VXX. VDD = 5.0V for TC74AX -5.0 VXX. All part types of the TC74 will operate properly over the wider power supply range of 2.7V to 5.5V. Each part type is tested and specified for rated accuracy at its nominal supply voltage. As VDD varies from the nominal value, accuracy will degrade 1C/V of V DD change. 2002 Microchip Technology Inc. DS21462C-page 3 TC74 SMBUS Read Timing Diagram A B tLOW tHIGH C D E F G H I K J SCLK SDA tSU(START) tH(START) tSU-DATA tSU(STOP) E = Slave Pulls SDA Line Low F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Master H = LSB of Data Clocked into Master A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave tIDLE I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition SMBUS Write Timing Diagram A B tLOW tHIGH C D E F G H I J K L M SCLK SDA tSU(START) tH(START) tSU-DATA A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave E = Slave Pulls SDA Line Low FIGURE 1-1: DS21462C-page 4 tH-DATA F = Acknowledge Bit Clocked into Master G = MSB of Data Clocked into Slave H = LSB of Data Clocked into Slave I = Slave Pulls SDA Line Low tSU(STOP) tIDLE J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = Stop Condition, Data Executed by Slave M = New Start Condition Timing Diagrams. 2002 Microchip Technology Inc. TC74 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: 2.1 PIN FUNCTION TABLE Pin No. (5-Pin SOT-23) Pin No. (5-Pin TO-220) Symbol Type Description 1 1 NC None No Internal Connection 2 3 GND Power System Ground 3 5 VDD Power Power Supply Input 4 4 SCLK Input SMBus/I2C Serial Clock 5 2 SDA Bidirectional SMBus/I2C Serial Data Ground (GND) Input. Ground return for all TC74 functions. 2.2 Power Supply Input (VDD) Power supply input. See Electrical Specifications. 2.3 SMBus/I2C Serial Clock (SCLK) Input. SMBus/I2C serial clock. Clocks data into and out of the TC74. See System Management Bus Specification, Rev. 1.0, for timing diagrams. 2.4 Serial Data (SDA) Bidirectional. Serial data is transferred on the SMBus/ I2C in both directions using this pin. See System Management Bus Specification, Rev. 1.0 for timing diagrams. 2002 Microchip Technology Inc. DS21462C-page 5 TC74 3.0 DETAILED DESCRIPTION 3.1 Functional Description TABLE 3-2: Term Transmitter SERIAL BUS CONVENTIONS Explanation The device sending data to the bus. The TC74 acquires and converts temperature information from its onboard solid-state sensor with a resolution of 1C. It stores the data in an internal register which is then read through the serial port. The system interface is a slave SMBus/I2C port, through which temperature data can be read at any time. Eight SMBus/I2C addresses are programmable for the TC74, which allows for a multi-sensor configuration. Also, there is low power Standby mode when temperature acquisition is suspended. Receiver The device receiving data from the bus. Master The device which controls the bus initiating transfers (START), generating the clock and terminating transfers (STOP). Slave The device addressed by the master. START A unique condition signaling the beginning of a transfer indicated by SDA falling (high-low) while SCLK is high. 3.1.1 STOP A unique condition signaling the end of a transfer indicated by SDA rising (lowhigh) while SCLK is high. ACK A Receiver acknowledges the receipt of each byte with this unique condition. The Receiver drives SDA low during SCLK high of the ACK clock-pulse. The Master provides the clock pulse for the ACK cycle. Busy Communication is not possible because the bus is in use. NOT Busy When the bus is idle, both SDA and SCLK will remain high. Data Valid The state of SDA must remain stable during the high period of SCLK in order for a data bit to be considered valid. SDA only changes state while SCLK is low during normal data transfers (see START and STOP conditions). STANDBY MODE The host is allowed, by the TC74, to put it into a low power (IDD = 5 A, typical) Standby mode. In this mode, the A/D converter is halted and the temperature data registers are frozen. The SMBus/I2C port, though, operates normally. Standby mode is enabled by setting the SHDN bit in the CONFIG register. Table 3-1 summarizes this operation. TABLE 3-1: STANDBY MODE OPERATION SHDN Bit Operating Mode 0 Normal 1 Standby 3.1.2 SMBUS/I2C SLAVE ADDRESS The TC74 is internally programmed to have a default SMBus/I2C address value of 1001 101b. Seven other addresses are available by custom order (contact Microchip Technology Inc. 3.2 Serial Port Operation The Serial Clock input (SCLK) and bidirectional data port (SDA) form a 2-wire bidirectional serial port for programming and interrogating the TC74. The conventions used in this bus architecture are listed in Table 3-2. DS21462C-page 6 All transfers take place under the control of a host, usually a CPU or microcontroller, acting as the Master. This host provides the clock signal for all transfers. The TC74 always operates as a Slave. The serial protocol is illustrated in Figure 3-1. All data transfers have two phases and all bytes are transferred MSB first. Accesses are initiated by a START condition, followed by a device address byte and one or more data bytes. The device address byte includes a Read/Write selection bit. Each access must be terminated by a STOP condition. A convention called "Acknowledge" (ACK) confirms receipt of each byte. Note that SDA can change only during periods when SCLK is low (SDA changes while SCLK is high are reserved for START and STOP conditions). 2002 Microchip Technology Inc. TC74 Write Byte Format S Address WR ACK Command 7 Bits ACK Data 8 Bits Slave Address ACK P 8 Bits Command Byte: selects which register you are writing to. Data Byte: data goes into the register set by the command byte. Read Byte Format S Address WR ACK Command 7 Bits ACK S Address 8 Bits Slave Address RD ACK 7 Bits Command Byte: selects which register you are reading from. Data NACK P 8 Bits Slave Address: repeated due to change in dataflow direction. Data Byte: reads from the register set by the command byte. Receive Byte Format S Address RD ACK 7 Bits S = START Condition P = STOP Condition Shaded = Slave Transmission FIGURE 3-1: 3.3 Data NACK Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission. SMBus/I2C Protocols. START Condition (S) The TC74 continuously monitors the SDA and SCLK lines for a START condition (a high-to-low transition of SDA while SCLK is high) and will not respond until this condition is met. 3.4 Address Byte Immediately following the START condition, the host must transmit the address byte to the TC74. The states of A2, A1 and A0 determine the SMBus/I2C address for the TC74. The 7-bit address transmitted in the serial bit stream must match for the TC74 to respond with an Acknowledge (indicating the TC74 is on the bus and ready to accept data). The 8-bit in the address byte is a Read/Write bit. This bit is a `1' for a read operation or `0' for a write operation. During the first phase of any transfer, this bit will be set = 0, indicating that the command byte is being written. 3.5 P 8 Bits 3.6 Data Byte After a successful ACK of the address byte, the host must transmit the data byte to be written, or clock-in the data to be read (see the appropriate timing diagrams). ACK will be generated upon a successful write of a data byte into the TC74. 3.7 STOP Condition (P) Communications must be terminated by a STOP condition (a low-to-high transition of SDA while SCLK is high). The STOP condition must be communicated by the transmitter to the TC74. Refer to Figure 1-1, "Timing Diagrams", for serial bus timing. Acknowledge (ACK) Acknowledge (ACK) provides a positive handshake between the host and the TC74. The host releases SDA after transmitting 8 bits. The host then generates a ninth clock cycle to allow the TC74 to pull the SDA line low. This action acknowledges that the TC74 successfully received the previous 8 bits of data or address. 2002 Microchip Technology Inc. DS21462C-page 7 TC74 4.0 REGISTER SET AND PROGRAMMER'S MODEL TABLE 4-1: COMMAND BYTE DESCRIPTION (SMBUS/I2C READ_BYTE AND WRITE_BYTE) TABLE 4-3: TEMPERATURE REGISTER (TEMP) D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0] MSB X X X X X X LSB In temperature data registers, each unit value repre- Command Code RTR 00h Read Temperature (TEMP) sents one degree (Celsius). The value is in 2's complement binary format such that a reading of 0000 0000b corresponds to 0C. Examples of this temperature to binary value relationship are shown in Table 4-4. RWCR 01h Read/Write Configuration (CONFIG) TABLE 4-4: TABLE 4-2: Bit POR D[7] 0 D[6] 0 D[5]D[0] 0 Function CONFIGURATION REGISTER (CONFIG); 8 BITS, READ/ WRITE) Actual Temperature Registered Temperature Binary Hex Operation +130.00C +127C 0111 1111 STANDBY Switch Read/ 1 = standby, Write 0 = normal +127.00C +127C 0111 1111 Data Ready * Read 1 = ready Only 0 = not ready +126.50C +126C 0111 1110 +25.25C +25C 0001 1001 +0.50C 0C 0000 0000 +0.25C 0C 0000 0000 0.00C 0C 0000 0000 -0.25C -1C 1111 1111 -0.50C -1C 1111 1111 -0.75C -1C 1111 1111 -1.00C -1C 1111 1111 -25.00C -25C 1110 0111 -25.25C -26C 1110 0110 -54.75C -55C 1100 1001 -55.00C -55C 1100 1001 -65.00C -65C 1011 1111 Function Reserved Always returns zero when read Type N/A N/A Note 1: *DATA_RDY bit RESET at power-up and SHDN enable. VDD DATA_RDY 4.2 tconv tconv FIGURE 4-1: DATA_RDY, SHDN Operation Logic Diagram. Temperature Register (TEMP), 8 Bits, READ ONLY The binary value (2's complement format) in this register represents temperature of the onboard sensor following a conversion cycle. The registers are automatically updated in an alternating manner. DS21462C-page 8 Register Set Summary The TC74 register set is summarized in Table 4-5. All registers are 8 bits wide. SHDN 4.1 TEMPERATURE-TO-DIGITAL VALUE CONVERSION (TEMP) TABLE 4-5: Name TEMP CONFIG TC74 REGISTER SET SUMMARY Description POR State 0000 Internal Sensor Temperature (2's 0000b (1) Complement) CONFIG Register 0000 0000b Read Write N/A Note 1: The TEMP register will be immediately updated by the A/D converter after the DATA_RDY Bit goes high. 2002 Microchip Technology Inc. TC74 5.0 PACKAGING INFORMATION 5.1 SOT23A Package Marking Information 5-Pin SOT-23A 5 4 1 & 2 = part number code + temp. range and voltage 3 = year and quarter code 1 2 3 4 1 4 = lot ID number 3 2 SOT-23 Package Marking Codes SOT-23 (V) Address Code SOT-23 (V) Address Code TC74A0-3.3VCT 1001 000 V0 TC74A0-5.0VCT 1001 000 U0 TC74A1-3.3VCT 1001 001 V1 TC74A1-5.0VCT 1001 001 U1 TC74A2-3.3VCT 1001 010 V2 TC74A2-5.0VCT 1001 010 U2 TC74A3-3.3VCT 1001 011 V3 TC74A3-5.0VCT 1001 011 U3 TC74A4-3.3VCT 1001 100 V4 TC74A4-5.0VCT 1001 100 U4 TC74A5-3.3VCT 1001 101* V5 TC74A5-5.0VCT 1001 101* U5 TC74A6-3.3VCT 1001 110 V6 TC74A6-5.0VCT 1001 110 U6 TC74A7-3.3VCT 1001 111 V7 TC74A7-5.0VCT 1001 111 U7 Note: * Default Address TO-220 Package Marking Information TO-220 Legend: XX...X YY WW NNN Note: In the event the full Microchip part number cannot be marked on one line, it will be carried over to the next line thus limiting the number of available characters for customer specific information. TC74A03.3VAT 0229123 1 * 2 3 4 Customer specific information* Year code (last 2 digits of calendar year) Week code (week of January 1 is week `01') Alphanumeric traceability code 5 Standard marking consists of Microchip part number, year code, week code, and traceability code. 2002 Microchip Technology Inc. DS21462C-page 9 TC74 5.2 Taping Forms Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices User Direction of Feed Device Marking W PIN 1 P Standard Reel Component Orientation for TR Suffix Device (Mark Right Side Up) Carrier Tape, Number of Components Per Reel and Reel Size: Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 5-Pin SOT-23A 8 mm 4 mm 3000 7 in. DS21462C-page 10 2002 Microchip Technology Inc. TC74 5.3 Package Dimensions SOT-23A-5 .075 (1.90) REF. .122 (3.10) .098 (2.50) .071 (1.80) .059 (1.50) .020 (0.50) .012 (0.30) PIN 1 .037 (0.95) REF. .118 (3.00) .010 (2.80) .057 (1.45) .035 (0.90) .010 (0.25) .004 (0.09) 10 MAX. .006 (0.15) .000 (0.00) .024 (0.60) .004 (0.10) Dimensions: inches (mm) 5-Pin TO-220 .185 (4.70) .165 (4.19) .117 (2.97) .103 (2.62) .415 (10.54) .390 (9.91) .156 (3.96) .140 (3.56) DIA. .055 (1.40) .045 (1.14) .293 (7.44) .204 (5.18) 3 - 7.5 5 PLCS. .613 (15.57) .569 (14.45) .037 (0.95) .025 (0.64) .590 (14.99) .482 (12.24) .025 (0.64) .012 (0.30) .072 (1.83) .062 (1.57) PIN 1 .273 (6.93) .263 (6.68) .115 (2.92) .087 (2.21) Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21462C-page 11 TC74 NOTES: DS21462C-page 12 2002 Microchip Technology Inc. TC74 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. Device XX -XX X XX Address Supply Operating Package Options Voltage Temperature Device: TC74: Address Options: A0 A1 A2 A3 A4 A5 A6 A7 Serial Digital Thermal Sensor = = = = = = = = 1001 1001 1001 1001 1001 1001 1001 1001 000 001 010 011 100 101 * 110 111 * Default Address Supply Voltage: 3.3 5.0 = Accuracy optimized for 3.3V = Accuracy optimized for 5.0V Operating Temperature: V = -40C TA +125C Package: a) TC74A0-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor b) TC74A1-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor c) TC74A2-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor d) TC74A3-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor e) TC74A4-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor f) TC74A5-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor * g) TC74A6-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor h) TC74A7-3.3VCTTR: SOT-23 Serial Digital Thermal Sensor a) TC74A0-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor b) TC74A1-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor c) TC74A2-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor d) TC74A3-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor e) TC74A4-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor f) TC74A5-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor * g) TC74A6-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor h) TC74A7-5.0VCTTR: SOT-23 Serial Digital Thermal Sensor * Default Address CTTR = SOT-23-5 (Tape and Reel only) PART NO. Device Examples: XX -XX X XX Address Supply Operating Package Options Voltage Temperature Device: Address Options: TC74: A0 A1 A2 A3 A4 A5 A6 A7 = = = = = = = = Serial Digital Thermal Sensor 1001 1001 1001 1001 1001 1001 1001 1001 000 001 010 011 100 101 * 110 111 * Default Address Output Voltage: 3.3 = Accuracy optimized for 3.3V 5.0 = Accuracy optimized for 5.0V Operating Temperature: V = -40C TA +125C Package: AT Examples: a) TC74A0-3.3VAT: TO-220 Serial Digital Thermal Sensor b) TC74A1-3.3VAT: TO-220 Serial Digital Thermal Sensor c) TC74A2-3.3VAT: TO-220 Serial Digital Thermal Sensor d) TC74A3-3.3VAT: TO-220 Serial Digital Thermal Sensor e) TC74A4-3.3VAT: TO-220 Serial Digital Thermal Sensor f) TC74A5-3.3VAT: TO-220 Serial Digital Thermal Sensor * g) TC74A6-3.3VAT: TO-220 Serial Digital Thermal Sensor h) TC74A7-3.3VAT: TO-220 Serial Digital Thermal Sensor a) TC74A0-5.0VAT: TO-220 Serial Digital Thermal Sensor b) TC74A1-5.0VAT: TO-220 Serial Digital Thermal Sensor c) TC74A2-5.0VAT: TO-220 Serial Digital Thermal Sensor d) TC74A3-5.0VAT: TO-220 Serial Digital Thermal Sensor e) TC74A4-5.0VAT: TO-220 Serial Digital Thermal Sensor f) TC74A5-5.0VAT: TO-220 Serial Digital Thermal Sensor * g) TC74A6-5.0VAT: TO-220 Serial Digital Thermal Sensor h) TC74A7-5.0VAT: TO-220 Serial Digital Thermal Sensor * Default Address = TO-220-5 Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products. 2002 Microchip Technology Inc. DS21462C-page13 TC74 NOTES: DS21462C-page 14 2002 Microchip Technology Inc. Note the following details of the code protection feature on Microchip devices: * Microchip products meet the specification contained in their particular Microchip Data Sheet. * Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. * There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. * Microchip is willing to work with the customer who is concerned about the integrity of their code. * Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as "unbreakable." Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip's products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, K EELOQ, MPLAB, PIC, PICmicro, PICSTART and PRO MATE are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. dsPIC, dsPICDEM.net, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. (c) 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company's quality system processes and procedures are QS-9000 compliant for its PICmicro (R) 8-bit MCUs, KEELOQ(R) code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip's quality system for the design and manufacture of development systems is ISO 9001 certified. 2002 Microchip Technology Inc. DS21462C - page 15 M WORLDWIDE SALES AND SERVICE AMERICAS ASIA/PACIFIC Corporate Office Australia 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 Rocky Mountain China - Beijing 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-4338 Atlanta 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 Fax: 770-640-0307 Boston 2 Lan Drive, Suite 120 Westford, MA 01886 Tel: 978-692-3848 Fax: 978-692-3821 Chicago 333 Pierce Road, Suite 180 Itasca, IL 60143 Tel: 630-285-0071 Fax: 630-285-0075 Dallas 4570 Westgrove Drive, Suite 160 Addison, TX 75001 Tel: 972-818-7423 Fax: 972-818-2924 Detroit Tri-Atria Office Building 32255 Northwestern Highway, Suite 190 Farmington Hills, MI 48334 Tel: 248-538-2250 Fax: 248-538-2260 Kokomo 2767 S. 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No. 6 Chaoyangmen Beidajie Beijing, 100027, No. China Tel: 86-10-85282100 Fax: 86-10-85282104 China - Chengdu Microchip Technology Consulting (Shanghai) Co., Ltd., Chengdu Liaison Office Rm. 2401, 24th Floor, Ming Xing Financial Tower No. 88 TIDU Street Chengdu 610016, China Tel: 86-28-86766200 Fax: 86-28-86766599 China - Fuzhou Microchip Technology Consulting (Shanghai) Co., Ltd., Fuzhou Liaison Office Unit 28F, World Trade Plaza No. 71 Wusi Road Fuzhou 350001, China Tel: 86-591-7503506 Fax: 86-591-7503521 China - Shanghai Microchip Technology Consulting (Shanghai) Co., Ltd. Room 701, Bldg. B Far East International Plaza No. 317 Xian Xia Road Shanghai, 200051 Tel: 86-21-6275-5700 Fax: 86-21-6275-5060 China - Shenzhen Microchip Technology Consulting (Shanghai) Co., Ltd., Shenzhen Liaison Office Rm. 1315, 13/F, Shenzhen Kerry Centre, Renminnan Lu Shenzhen 518001, China Tel: 86-755-82350361 Fax: 86-755-82366086 China - Hong Kong SAR Microchip Technology Hongkong Ltd. Unit 901-6, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 India Microchip Technology Inc. India Liaison Office Divyasree Chambers 1 Floor, Wing A (A3/A4) No. 11, O'Shaugnessey Road Bangalore, 560 025, India Tel: 91-80-2290061 Fax: 91-80-2290062 Japan Microchip Technology Japan K.K. Benex S-1 6F 3-18-20, Shinyokohama Kohoku-Ku, Yokohama-shi Kanagawa, 222-0033, Japan Tel: 81-45-471- 6166 Fax: 81-45-471-6122 Korea Microchip Technology Korea 168-1, Youngbo Bldg. 3 Floor Samsung-Dong, Kangnam-Ku Seoul, Korea 135-882 Tel: 82-2-554-7200 Fax: 82-2-558-5934 Singapore Microchip Technology Singapore Pte Ltd. 200 Middle Road #07-02 Prime Centre Singapore, 188980 Tel: 65-6334-8870 Fax: 65-6334-8850 Taiwan Microchip Technology (Barbados) Inc., Taiwan Branch 11F-3, No. 207 Tung Hua North Road Taipei, 105, Taiwan Tel: 886-2-2717-7175 Fax: 886-2-2545-0139 EUROPE Austria Microchip Technology Austria GmbH Durisolstrasse 2 A-4600 Wels Austria Tel: 43-7242-2244-399 Fax: 43-7242-2244-393 Denmark Microchip Technology Nordic ApS Regus Business Centre Lautrup hoj 1-3 Ballerup DK-2750 Denmark Tel: 45 4420 9895 Fax: 45 4420 9910 France Microchip Technology SARL Parc d'Activite du Moulin de Massy 43 Rue du Saule Trapu Batiment A - ler Etage 91300 Massy, France Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79 Germany Microchip Technology GmbH Steinheilstrasse 10 D-85737 Ismaning, Germany Tel: 49-89-627-144 0 Fax: 49-89-627-144-44 Italy Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 United Kingdom Microchip Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 10/18/02 DS21462C-page 16 2002 Microchip Technology Inc.