21462C

21462c MICROCHIP | Alldatasheet

Document overview

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Technical content

Features

• Digital Temperature Sensing in SOT-23-5 or TO-220 Packages
• Outputs Temperature as an 8-Bit Digital Word
• Simple SMBus/I 2C™ Serial Port Interface
• Solid-State Temperature Sensing: - ±2°C (max.) Accuracy from +25°C to +85°C - ±3°C (max.) Accuracy from 0°C to +125°C
• Supply Voltage of 2.7V to 5.5V
• L o w P o w e r : - 200 µA (typ.) Operating Current - 5 µA (typ.) Standby Mode Current

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 General Description The TC74 is a serially accessible, digital temperature sensor particularly suited for low cost and small form- factor applications. Temperature data is converted from the onboard thermal sensing element and made available as an 8-bit digital word. Communication with the TC74 is accomplished via a 2- wire SMBus/I 2C 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 1°C. Conversion rate is a nominal 8 samples/sec. During normal operation, the quiescent current is 200 µA (typ). During standby operation, the quiescent current is 5 µA (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 GND VDD NC SDA SCLK TO-220 SOT-23 VDDGND NC 5 4 SDA SCLK TC74 12345 TC74 Note: The TO-220 tab is connected to pin 3 (GND) Internal Sensor (Diode) ∆Σ Modulator Temperature Register Serial Port Interface Control Logic SDA SCLK Tiny Serial Digital Thermal Sensor

DS21462C-page 2  2002 Microchip Technology Inc.

1.0 ELECTRICAL

1.1 Absolute Maximum Ratings†

† Notice: Stresses above those listed under "Maxi- mum Ratings" may cause permanent damage to the device. This is a stress rating only and functional oper- ation 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 rat- ing conditions for extended periods may affect device reliability. DC CHARACTERISTICS VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5 Parameters Sym Min Typ Max Units Conditions Power Supply Power-on Reset Threshold V POR 1.2 — 2.2 V V DD Falling Edge or Rising Edge Supply Voltage V DD 2.7 — 5.5 V Note 5 Operating Current I DD — 200 350 µA V DD = 5.5V, Note 1 Standby Supply Current I DD-STANDBY — 5.0 10 µA V DD = 3.3V Serial Port Inactive, Note 4 Temperature-to-Bits Converter T emperature Accuracy T ERR -2.0 -3.0 ±2.0 +2.0 +3.0 0°C < TA < +125°C -40°C < TA < 0°C Conversion Rate CR 4 8 — SPS Note 2 Serial Port Interface Logic Input High V IH 0.8 x VDD ——V Logic Input Low V IL — — 0.2 x V DD V SDA Output Low V OL — 0.4 0.6 V V IOL = 3 mA IOL = 6 mA, Note 3 Input Capacitance SDA, SCLK C IN —5 . 0— p F I/O Leakage I LEAK -1.0 0.1 1.0 µA Serial Port AC Timing (CLOAD = 80 pF) SMBus/I2C Clock Frequency f SMB 10 — 100 kHz Low Clock Period t LOW 4.7 — — µsec 10% to 10% High Clock Period t HIGH 4.0 — — µsec 90% to 90% 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 V DD or GND. 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 1°C/V of VDD change.

 2002 Microchip Technology Inc. DS21462C-page 3 TC74 SMBus/I2C Rise Time SMBus/I2C Fall Time tR tF 1000 300 nsec nsec 10% to 90% 90% to10% START Condition Setup Time (for repeated START Condition) t SU(START) 4.0 — — µsec 90% SCLK to 10% SDA START Condition Hold Time t H(START) 4.0 — — µsec Data In Setup Time t SU-DATA 1000 — — nsec Data In Hold Time t H-DAT 1250 — — nsec STOP Condition Setup Time t SU(STOP) 4.0 — — µsec Bus Free Time Prior to New Transition tIDLE 4.7 — — µsec Power-on Reset Delay t POR —5 0 0— µ s e c V DD ≥ VPOR (Rising Edge) DC CHARACTERISTICS (CONTINUED) VDD = 5.0V for TC74AX-5.0VXX, -40°C ≤ TA ≤ 125°C. Note 5 Parameters Sym Min Typ Max Units Conditions 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 V DD or GND. 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 V DD varies from the nominal value, accuracy will degrade 1°C/V of VDD change.

DS21462C-page 4  2002 Microchip Technology Inc. FIGURE 1-1: Timing Diagrams. C = LSB of Address Clocked into Slave tSU(START) tH(START) tSU-DATA tSU(STOP) tIDLE A = Start Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave A B CD E FG H IJ K 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 t LOW tHIGH I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition SCLK SDA SMBUS Read Timing Diagram tSU(START) tH(START) tSU-DATA tSU(STOP) tIDLE A = Start Condition B = MSB of Address Clocked into Slave D = R/W Bit Clocked into Slave E = Slave Pulls SDA Line Low A B CD E FG H I J KL M 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 J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = Stop Condition, Data Executed by Slave M = New Start Condition tLOW tHIGH SCLK SDA tH-DATA SMBUS Write Timing Diagram

 2002 Microchip Technology Inc. DS21462C-page 5 TC74

2.0 PIN DESCRIPTIONS

The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE

2.1 Ground (GND)

Input. Ground return for all TC74 functions.

2.2 Power Supply Input (V DD)

Power supply input. See Electrical Specifications.

2.3 SMBus/I 2C 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/ I 2C in both directions using this pin. See System Management Bus Specification, Rev. 1.0 for timing diagrams. 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 35 V DD Power Power Supply Input 4 4 SCLK Input SMBus/I 2C Serial Clock 5 2 SDA Bidirectional SMBus/I 2C Serial Data

DS21462C-page 6  2002 Microchip Technology Inc.

3.0 DETAILED DESCRIPTION

3.1 Functional Description

The TC74 acquires and converts temperature information from its onboard solid-state sensor with a resolution of ±1°C. It stores the data in an internal register which is then read through the serial port. The system interface is a slave SMBus/I 2C port, through which temperature data can be read at any time. Eight SMBus/I 2C 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.

3.1.1 STANDBY MODE

The host is allowed, by the TC74, to put it into a low power (I DD = 5 µA, 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

3.1.2 SMBUS/I 2C 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 pro- gramming and interrogating the TC74. The conventions used in this bus architecture are listed in Table 3-2. TABLE 3-2: SERIAL BUS CONVENTIONS All transfers take place under the control of a host, usu- ally 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 selec- tion 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). SHDN Bit Operating Mode

0 Normal

1 Standby

Transmitter The device sending data to the bus. Receiver The device receiving data from the bus. Master The device which controls the bus initi- ating transfers (START), generating the clock and terminating transfers (STOP). Slave The device addressed by the master. START A unique condition signaling the begin- ning of a transfer indicated by SDA falling (high-low) while SCLK is high. STOP A unique condition signaling the end of a transfer indicated by SDA rising (low- high) 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).

 2002 Microchip Technology Inc. DS21462C-page 7 TC74 FIGURE 3-1: SMBus/I2C Protocols.

3.3 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/I 2C 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 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.

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. SA d d r e s sW R A C K CommandACK Data ACK P

8 Bits7 Bits 8 Bits

Slave Address Command Byte: selects which register you are writing to. Data Byte: data goes into the register set by the command byte. Write Byte Format Read Byte Format SA d d r e s s W R A C K CommandACK S Address RD ACK Data NACK P

7 Bits 8 Bits 7 Bits 8 Bits

Slave Address Command Byte: selects which register you are reading from. Slave Address: repeated due to change in data- flow direction. Data Byte: reads from the register set by the command byte. Receive Byte Format S Address RD ACK Data NACK P

7 Bits 8 Bits

Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission. S = START Condition P = STOP Condition Shaded = Slave Transmission

DS21462C-page 8  2002 Microchip Technology Inc.

4.0 REGISTER SET AND

PROGRAMMER’S MODEL TABLE 4-1: COMMAND BYTE

DESCRIPTION

(SMBUS/I 2C READ_BYTE AND WRITE_BYTE) TABLE 4-2: CONFIGURATION REGISTER (CONFIG); 8 BITS, READ/ WRITE) FIGURE 4-1: DATA_RDY, SHDN Operation Logic Diagram.

4.1 Temperature Register (TEMP),

8 Bits, READ ONLY

The binary value (2’s complement format) in this regis- ter represents temperature of the onboard sensor following a conversion cycle. The registers are automatically updated in an alternating manner. TABLE 4-3: TEMPERATURE REGISTER (TEMP) In temperature data registers, each unit value repre- sents one degree (Celsius). The value is in 2’s complement binary format such that a reading of 0000 0000b corresponds to 0°C. Examples of this temperature to binary value relationship are shown in Table 4-4 TABLE 4-4: TEMPERATURE-TO-DIGITAL VALUE CONVERSION (TEMP)

4.2 Register Set Summary

The TC74 register set is summarized in Table 4-5. All registers are 8 bits wide. TABLE 4-5: TC74 REGISTER SET SUMMARY Command Code Function RTR 00h Read T emperature (TEMP) RWCR 01h Read/Write Configuration (CONFIG) Bit POR Function Type Operation D[7] 0 STANDBY Switch Read/ Write 1 = standby, 0 = normal D[6] 0 Data Ready * Read Only 1 = ready 0 = not ready D[5]- D[0]

0 Reserved -

Note 1: * DATA_RDY bit RESET at power-up and SHDN enable. VDD DATA_RDY SHDN tconv tconv MSB X X X X X X LSB Actual Temperature Registered Temperature Binary Hex +130.00°C +127°C 0111 1111 +127.00°C +127°C 0111 1111 +126.50°C +126°C 0111 1110 +25.25°C +25°C 0001 1001 +0.50°C 0°C 0000 0000 +0.25°C 0°C 0000 0000 0.00°C 0°C 0000 0000 -0.25°C -1°C 1111 1111 -0.50°C -1°C 1111 1111 -0.75°C -1°C 1111 1111 -1.00°C -1°C 1111 1111 -25.00°C -25°C 1110 0111 -25.25°C -26°C 1110 0110 -54.75°C -55°C 1100 1001 -55.00°C -55°C 1100 1001 -65.00°C -65°C 1011 1111 Name Description POR State Read Write TEMP Internal Sensor Temperature (2’s Complement) 0000 0000b (1) √ N/A CONFIG CONFIG Register 0000 0000b √√ 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. DS21462C-page 9 TC74

5.0 PACKAGING INFORMATION

5.1 SOT23A Package Marking Information

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 3 = year and quarter code 4 = lot ID number 1 & 2 = part number code + temp. range and voltage 2 3 5-Pin SOT-23A 14 23 Legend: XX...X Customer specific information* YY Year code (last 2 digits of calendar year) WW Week code (week of January 1 is week ‘01’) NNN Alphanumeric traceability code 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 lim- iting the number of available characters for customer specific infor- mation. * Standard marking consists of Microchip part number, year code, week code, and traceability code. TO-220 1 2345 TC74A0- 3.3VAT 0229123

DS21462C-page 10  2002 Microchip Technology Inc.

5.2 Taping Forms

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. Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices Device Marking PIN 1 User Direction of Feed Standard Reel Component Orientation for TR Suffix Device (Mark Right Side Up) W P

 2002 Microchip Technology Inc. DS21462C-page 11 TC74

5.3 Package Dimensions

.122 (3.10) .098 (2.50) .071 (1.80) .059 (1.50) .037 (0.95) REF . .020 (0.50) .012 (0.30) .118 (3.00) .010 (2.80) .006 (0.15) .000 (0.00) .057 (1.45) .024 (0.60) .004 (0.10) .010 (0.25) .004 (0.09) .075 (1.90) REF. PIN 1 Dimensions: inches (mm) 5-Pin TO-220 .273 (6.93) .263 (6.68) .037 (0.95) .025 (0.64) .117 (2.97) .103 (2.62) .415 (10.54) .140 (3.56) DIA. .293 (7.44) .204 (5.18) .590 (14.99) .482 (12.24) .072 (1.83) .062 (1.57) PIN 1 .185 (4.70) .165 (4.19) .055 (1.40) .045 (1.14) .613 (15.57) .569 (14.45) .115 (2.92) .087 (2.21) .025 (0.64) .012 (0.30) 3 - 7.5 5 PLCS. Dimensions: inches (mm)

DS21462C-page 12  2002 Microchip Technology Inc. NOTES:

 2002 Microchip Technology Inc. DS21462C-page13 TC74 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office . Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom- mended workarounds. T o determine if an errata sheet exists for a particular device, please contact one of the following: 1. Your local Microchip sales office 2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 3. 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. PART NO. XX XX PackageAddress Options Device Device: TC74: Serial Digital Thermal Sensor Address Options: A0 = 1001 000 A1 = 1001 001 A2 = 1001 010 A3 = 1001 011 A4 = 1001 100 A5 = 1001 101 * A6 = 1001 110 A7 = 1001 111 * Default Address Supply Voltage: 3.3 = Accuracy optimized for 3.3V 5.0 = Accuracy optimized for 5.0V Operating Temperature: V = -40°C ≤ TA ≤ +125°C Package: CTTR = SOT-23-5 (Tape and Reel only) Examples: 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 -XX Supply Voltage X Operating Temperature Device: TC74: Serial Digital Thermal Sensor Address Options: A0 = 1001 000 A1 = 1001 001 A2 = 1001 010 A3 = 1001 011 A4 = 1001 100 A5 = 1001 101 * A6 = 1001 110 A7 = 1001 111 * Default Address Output Voltage: 3.3 = Accuracy optimized for 3.3V 5.0 = Accuracy optimized for 5.0V Operating Temperature: V = -40°C ≤ TA ≤ +125°C Package: AT = TO-220-5 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 PART NO. XX XX PackageAddress Options Device -XX Supply Voltage X Operating Temperature

DS21462C-page 14  2002 Microchip Technology Inc. NOTES:

 2002 Microchip Technology Inc. DS21462C - page 15 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 com- ponents in life support systems is not authorized except with express written approval by Microchip. No licenses are con- veyed, 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, micro ID, 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 T otal 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. © 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 ® 8-bit MCUs, KEELOQ® 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. 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 i n 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 know l- edge, 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.

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6285 Northam Drive, Suite 108

Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 ASIA/PACIFIC Australia Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Microchip Technology Consulting (Shanghai) Co., Ltd., Beijing Liaison Office Unit 915 Bei Hai Wan T ai Bldg. 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

91300 Massy, France

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

Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 10/18/02 WORLDWIDE SALES AND SERVICE