TCM1617

TCM1617 MICROCHIP | Alldatasheet

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TCM1617-1 2/5/99 2001 Microchip Technology Inc. DS21485A SMBus Thermal Sensor with External Diode Input

FEATURES

I Includes Internal External Sensing Capability I Outputs Temperature as 8-Bit Digital Word I Solid State Temperature Sensing; 1°C Resolution I 3.0 – 5.5V Operating Range I Independent Internal and External Threshold Set-Points With ALERT# Interrupt Output I SMBus 2-Wire Serial Interface I Up To Nine TCM1617s May Share the Same Bus I Standby Mode for Low Standby Power I 16-Pin Plastic QSOP Package TYPICAL APPLICATIONS I Thermal Protection For Intel “Deschutes” Pentium II™ and Other High Performance CPUs with Integrated On-Board Diode — No Sensor Mounting Problems! I Accurate Thermal Sensing From Any Si Junction Diode I Thermal Management in Electronic Systems: Computers, Network Equipment, Power Supplies GENERAL DESCRIPTION The TCM1617 is a serially programmable temperature sensor optimized for monitoring modern high performance CPUs with on-board integrated thermal diodes. Tempera- ture data is converted from the CPU’s thermal diode outputs and made available as an 8-Bit digital word. Communication with the TCM1617 is accomplished via the standard System Management Bus (SMBus) commonly used in modern computer systems. This permits reading the current internal/external temperature, programming the threshold setpoints, and configuring the device. Addition- ally, an interrupt is generated on the ALERT# pin when temperature moves outside the preset threshold windows in either direction. A Standby command may be sent via the SMBus by signaling the STBY# input to activate the low-power Standby mode. Registers can be accessed while in Standby mode. Address selection inputs allow up to nine TCM1617s to share the same 2-wire SMBus for multi-zone monitoring. All registers can be read by the host, and both polled and interrupt driven systems are easily accommodated. Small size, low installed cost, and ease of use make the TCM1617 an ideal choice for implementing sophisticated system man- agement schemes, such as ACPI.

ORDERING INFORMATION

Part No. Package Temp. Range TCM1617MQR QSOP-16 –55 °C to +125°C TCM1617EV Evaluation Kit for TCM1617 BLOCK DIAGRAM PIN CONFIGURATION EVALUATION KIT AVAILABLE Register Set Modulator Control Logic SMBus Interface ALERT# STBY# SCL SDA ADD 0 ADD 1 D + D – Ext. Temp Status Byte Config. Byte Conv. Rate Ext. Hi Limit Ext. Lo Limit Int. Hi Limit Int. Lo Limit Int. Temp Internal Sensor (Diode) 16-Pin Plastic QSOP 1 16 21 5 31 4 41 3 51 2 61 1 71 0 NCD – VDD NC GND GND SCL STBY# NC SDA ALERT# ADD0 NC TCM1617 NC ADD 1

SMBus Thermal Sensor with External Diode Input TCM1617 TCM1617-1 2/5/99  2001 Microchip Technology Inc. DS21485A ABSOLUTE MAXIMUM RATINGS* *Static-sensitive device. Unused devices must be stored in conductive material. Protect devices from static discharge and static fields. Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS: VDD = 3.3V, –55°C ≤ TA ≤ 125°C, unless otherwise noted. Symbol Parameter Test Conditions Min Typ Max Unit Power Supply VDD Power Supply Voltage –55 ≤ TA ≤ +125°C 3.0 — 5.5 V VUV-LOCK VDD Undervoltage 2.4 2.80 2.95 V Lockout Threshold VPOR Power-On Reset Threshold V DD Falling Edge 1.0 1.7 2.3 V IDD Operating Current 0.25 Conv./Sec Rate — — 70 µA SMBus Inactive (Note 1) IDD Operating Current 2 Conv./Sec Rate — — 180 µA SMBus Inactive (Note 1) IDD-STANDBY Standby Supply Current V DD = 3.3V SMBus Active — — 100 µA IDD-STANDBY Standby Supply Current V DD = 3.3V, SMBus Inactive — — 10 µA IADD-BIAS ADD[1:0] Bias Current Power-Up Only — 160 — µA ALERT# Output VOL Output Low Voltage I OL = 1.0 mA (Note 3) — — 0.4 V ADD[1:0] Inputs VIL Logic Input Low — — VDD x 0.3 V VIH Logic Input High V DD x 0.7 — — V STBY# Input VIL Logic Input Low — — VDD x 0.3 V VIH Logic Input High V DD x 0.7 — — V Temp-to-Bits Converter TRES Basic Temperature Resolution — 1 — °C TIERR1 Internal Diode Temperature +60 °C ≤ TA ≤ +100°C– 2 — + 2 °C TEERR External Diode Temperature +60 °C ≤ TA ≤ +100°C– 3 — + 3 °C IDIODE-HIGH External Diode (D+) – (D–) ~ 0.65V — 100 — µA High Source Current IDIODE-LOW External Diode (D+) – (D–) ~ 0.65V — 10 — µA Low Source Current VD-SOURCE D– Source Voltage — 0.7 — V

TCM1617-1 2/5/99 2001 Microchip Technology Inc. DS21485A SMBus Thermal Sensor with External Diode Input NOTES: 1. Operating current is an average value (including external diode injection pulse current) integrated over multiple conversion cycles. Transient current may exceed this specification. 2. For true reccurring conversion time see Conversion Rate register description. 3. Output current should be minimized for best temperature accuracy. Power dissipation within the TCM1617 will cause self-heating and temperature drift error. 4. Refer to Application Note 64. SMBus PORT AC TIMING: VDD = 3.3V, –55 ≤ (TA = TJ) ≤ 125°C; CL = 80 pF, unless otherwise noted. Symbol Parameter Test Conditions Min Typ Max Unit fSMB SMBus Clock Frequency 10 — 100 KHz tLOW Low Clock Period 10% to 10% 4.7 — — µsec tHIGH High Clock Period 90% to 90% 4 — — µsec tR SMBus Rise Time 10% to 90% — — 1,000 nsec tF SMBus Fall Time 90% to 10% — — 300 nsec tSU(START) Start Condition Setup Time 90% SCL to 10% SDA 4 — — µsec (for Repeated Start Condition) tH(START) Start Condition Hold Time 4 — — µsec tSU-DATA Data in Set Up Time 1000 — — nsec tH-DATA Data in Hold Time 1250 — — nsec tSU(STOP) Stop Condition Setup Time 4 — — µsec tIDLE Bus Free Time Prior to 4.7 — — µsec New Transition Symbol Parameter Conditions Min Typ Max Unit tCONV Conversion Time from CHIP STOP to Conv. 54 83 112 msec Complete (Note 2) ∆CR Conversion Rate Accuracy See Conversion Rate Register Desc. –35 — +35 % 2-Wire SMBus Interface VIH Logic Input High 2.2 —— V VIL Logic Input Low — — 0.8 V VOL SDA Output Low I OL = 2 mA (Note 3) — — 0.4 V IOL = 4 mA (Note 3) — — 0.6 V C IN Input Capacitance SDA, SCL — 5 — pF ILEAK I/O Leakage –1 0.1 1 µA ELECTRICAL CHARACTERISTICS (CONT): VDD = 3.3V, –55°C ≤ TA ≤ 125°C, unless otherwise noted.

SMBus Thermal Sensor with External Diode Input TCM1617 TCM1617-1 2/5/99  2001 Microchip Technology Inc. DS21485A SMBUS Write Timing Diagram SMBUS Read Timing Diagram SMBUS THERMAL S tSU(START) tH(START) tSU-DATA tH-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 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 ILOW IHIGH SCL SDA 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 ILOW IHIGH I = Acknowledge Clock Pulse J = Stop Condition K = New Start Condition SCL SDA

TCM1617-1 2/5/99 2001 Microchip Technology Inc. DS21485A SMBus Thermal Sensor with External Diode Input PIN DESCRIPTION Pin Number Symbol Type Description 2V DD Power Power Supply Input

3 D+ Bi-Directional Current Source and A/D Positive Input

4 D– Bi-Directional Current Sink and A/D Negative Input

6,10 ADD[1:0] Input Address Select Pins (See Address Decode Table) 7,8 GND Power System Ground

11 ALERT# Output SMBus Interrupt (SMBALERT#)

12 SDA Bi-Directional SMBus Serial Data

14 SCL Input SMBus Serial Clock

15 STBY# Input Standby Enable

1,5, 9, 13,16 NC — Not Connected PIN DESCRIPTION SCL Input. SMBus serial clock. Clocks data into and out of the TCM1617. See System Management Bus Specification, rev. 1.0, for timing diagrams. SDA Bi-directional. Serial data is transferred on the SMBus in both directions using this pin. See System Management Bus Specification, rev. 1.0, for timing diagrams. ADD1, ADD0 Inputs. Sets the 7-bit SMBus address. These pins are “tri-state,” and the SMBus addresses are specified in the Address Decode Table below. (NOTE: The tri-state scheme allows up to nine TCM1617s on a single bus. A match between the TCM1617’s address and the address specified in the serial bit stream must be made to initiate communication. Many SMBus- compatible devices with other addresses may share the same 2-wire bus (see System Management Bus Specifica- tion rev. 1.0 for address allocations). These pins are only active at power-on reset, and will latch into the appropriate states. ALERT# Output, Open Collector, Active Low. The ALERT# out- put corresponds to the general SMBALERT# signal and indicates an interrupt event. The TCM1617 will respond to the standard SMBus Alert Response Address (see SMBus Specification 1.0) and associated protocol when ALERT# is asserted. Normally, the ALERT# output will be asserted when any of the following occurs: INT_TEMP equal to or exceeds INT_HLIM INT_TEMP falls below INT_LLIM EXT_TEMP equal to or exceeds EXT_HLIM EXT_TEMP falls below EXT_LLIM External Diode “Open” The operation of the ALERT# output is controlled by the MASK1 bit in the CONFIG register. If the MASK1 bit is set to “1,” no interrupts will be generated on ALERT#. The ALERT# output is cleared and re-armed by the Alert Response Address (ARA). This output may be WIRE-ORed with simi- lar outputs from other SMBus devices. If the alarm condition persists after the ARA, the ALERT# output will be immedi- ately re-asserted. (NOTE: A pull-up resistor is necessary on ALERT# since it is an open-drain output. Current sourced from the pull-up resistor causes power dissipation and may cause internal heating of the TCM1617. To avoid affecting the accuracy of internal temperature readings, the pull-up resis- tors should be made as large as possible.) STBY# Input. The activation of Standby mode may be achieved using either the STBY# pin or the CHIP STOP bit (CONFIG register). If STBY# is pulled low, the TCM1617 uncondition- ally enters its low-power Standby mode (I DD = 10 µA, max). The temperature-to-digital conversion process is halted, but ALERT remains functional. The TCM1617’s bus interface

0 Don’t Care Don’t Care Standby

at approximately 0.7V above GROUND. Input. Power supply input. See electrical specifications. Input. Ground return for all TCM1617 functions. rately in internal registers. the TCM1617, which allows for a multi-sensor configuration. Figure 1. Temperature-vs-Setpoint Event Generation TCM1617. The address is latched during POR. event to suppress re-assertion of ALERT# immediately after the ARA/de-assertion.

Figure 2. TCM1617 Functional Description Flowchart

SMBus Thermal Sensor with External Diode Input TCM1617 TCM1617-1 2/5/99  2001 Microchip Technology Inc. DS21485A Address Decode Table ADD0 ADD1 SMBus Address 0 0 0011 000 0 open (3-state) 0011 001 0 1 0011 010 open (3-state) 0 0101 001 open (3-state) (open (3-state) 0101 010 open (3-state) 1 0101 011 1 0 1001 100 1 open (3-state) 1001 101 1 1 1001 110 The Serial Clock input (SCL) and bi-directional data port (SDA) form a 2-wire bi-directional serial port for program- ming and interrogating the TCM1617. The following conven- tions are used in this bus architecture: All transfers take place under control of a host, usually a CPU or microcontroller, acting as the Master, which provides the clock signal for all transfers. The TCM1617 always operates as a slave. The serial protocol is illustrated in Figure 3. All data transfers have two phases; all bytes are transferred MSB first. Accesses are initiated by a start condition (START), followed by a device address byte and TCM1617 Serial Bus Conventions Term Explanation Transmitter The device sending data to the bus. 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 SCL is high. Stop A unique condition signaling the end of a transfer indicated by SDA rising (Low – High) while SCL is high. ACK A receiver acknowledges the receipt of each byte with this unique condition. The receiver drives SDA low during SCL 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 SCL will remain high. Data Valid The state of SDA must remain stable during the High period of SCL in order for a data bit to be considered valid. SDA only changes state while SCL is low during normal data transfers (see Start and Stop conditions.) one or more data bytes. The device address byte includes a Read/Write selection bit. Each access must be terminated by a Stop Condition (STOP). A convention called (ACK) confirms receipt of each byte. Note that SDA can change only during periods when SCL is LOW (SDA changes while SCL is High are reserved for Start and Stop conditions.) Start Condition (START) The TCM1617 continuously monitors the SDA and SCL lines for a start condition (a High to Low transition of SDA while SCL is High), and will not respond until this condition is met. Address Byte Immediately following the Start Condition, the host must transmit the address byte to the TCM1617. The states of ADD1 and ADD0 during power-up determine the 7-bit SMBus address for the TCM1617. The 7-bit address trans- mitted in the serial bit stream must match for the TCM1617 to respond with an Acknowledge (indicating the TCM1617 is on the bus and ready to accept data). The eighth bit in the Address Byte is a Read-Write Bit. This bit is 1 for a read operation or 0 for a write operation. Acknowledge (ACK) Acknowledge (ACK) provides a positive handshake between the host and the TCM1617. The host releases SDA after transmitting eight bits, then generates a ninth clock cycle to allow the TCM1617 to pull the SDA line Low to acknowledge that it successfully received the previous eight bits of data or address. Data Byte After a successful ACK of the address byte, the host must next transmit the data byte to be written or clock out the data to be read. (See the appropriate timing diagrams.) ACK will be generated after a successful write of a data byte into the TCM1617.

Figure 3. SMBus Protocols

8 Bits7 Bits 8 Bits

7 Bits 8 Bits 7 Bits 8 Bits

7 Bits 8 Bits

SMBus Thermal Sensor with External Diode Input TCM1617 TCM1617-1 2/5/99  2001 Microchip Technology Inc. DS21485A Stop Condition (STOP) Communications must be terminated by a stop condi- tion (a Low to High transition of SDA while SCL is High). The Stop Condition must be communicated by the transmitter to the TCM1617. (Refer to TCN75 data sheet for serial bus timing diagrams.) REGISTER SET AND PROGRAMMER ’S MODEL TCM1617 Command Set The TCM1617 supports four SMBus command proto- cols. These are READ_BYTE, WRITE_BYTE, SEND_BYTE, and RECEIVE_BYTE. See System Management Bus Speci- fication Rev. 1.0 for details. Command Byte Description Command Code Function RIT 00h Read Internal Temp (INT_TEMP) RET 01h Read External Temp (EXT_TEMP) RS 02h Read Status Byte (STATUS) RC 03h Read Configuration Byte (CONFIG) RCR 04h Read Conversion Rate Byte (CONV_RATE) RIHL 05h Read Internal High Limit (INT_HLIM) RILL 06h Read Internal Low Limit (INT_LLIM) REHL 07h Read External High Limit (EXT_HLIM) RELL 08h Read External Low Limit (EXT_LLIM) WC 09h Write Configuration Byte (CONFIG) WCR 0Ah Write Conversion Rate Byte (CONV_RATE) WIHL 0Bh Write Internal High Limit (INT_HLIM) WILL 0Ch Write Internal Low Limit (INT_LLIM) WEHL 0Dh Write External High Limit (EXT_HLIM) WELL 0Eh Write External Low Limit (EXT_LLIM) OSHT 0Fh One Shot Temp Measurement RMID FEh Read Manufacturer ID (MFR_ID) RMREV FFh Read Manufacturer Revision Number (MFR_REV) Configuration Register (Config), 8-Bits, Read/Write Configuration Register (Config) Mask1 Chip Stop Reserved Bit POR State Function Operation D[7] 0 Interrupt Mask 1 = mask ALERT#, (see text) 0 = don ’t mask ALERT # D[6] 0 Standby switch 1 = standby, 0 = normal D[5] – D[0] 0 Reserved – N/A Always returns zero when read. A/D Conversion Rate Register (CONV_RATE), 8-Bits, Read/Write A/D Conversion Rate Register (CONV_RATE) Reserved MSB X LSB Bit POR State Function Operation D[7:3] 0 Reserved – Always N/A returns zero when read. D[2:0] 010b Conversion rate bits. See below. A/D Conversion Rate Selection D2 D1 D0 Conversion Rate Sa/sec 0 0 0 0.0625 0 0 1 0.125 0 1 0 0.25 011 0 . 5 100 1 . 0 101 2 . 0 110 4 . 0 111 8 . 0 NOTE: Conversion rate denotes actual sampling of both internal and external sensors.NOTE: Proper device operation is NOT guaranteed if undefined locations (10h to FDh) are addressed. In case of erroneous SMBus operation (RECEIVE_BYTE command issued immediately after WRITE_BYTE command) the TCM1617 will ACKnowledge the address and return 1111 1111b to signify an error. Under no condition will it implement an SMBus “timeout.”

TCM1617-1 2/5/99 2001 Microchip Technology Inc. DS21485A SMBus Thermal Sensor with External Diode Input Temperature Registers, 8-Bits, Read-Only (INT_TEMP, EXT_TEMP) The binary value (2’s complement format) in these two registers represents temperature of the internal and external sensors following a conversion cycle. The registers are automatically updated in an alternating manner. Internal Temperature Register (INT_TEMP) MSB x x x x x x LSB External Temperature Register (EXT_TEMP) MSB x x x x x x LSB Temperature Threshold Setpoint Registers, 8-Bits, Read-Write (INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM) These registers store the values of the upper and lower temperature setpoints for event detection. The value is in 2’s-complement binary. INT_HLIM and INT_LLIM are com- pared with the INT_TEMP value, and EXT_HLIM and EXT_LLIM are compared with EXT_TEMP. These registers may be written at any time. Internal High Limit Setpoint Register (INT_HLIM) MSB x x x x x x LSB Internal Low Limit Setpoint Register (INT_LLIM) MSB x x x x x x LSB External High Limit Setpoint Register (EXT_HLIM) MSB x x x x x x LSB External Low Limit Setpoint Register (EXT_LLIM) MSB x x x x x x LSB NOTE: POR states: INT_HLIM 01111111b +127 °C INT_LLIM 11001001b –55°C EXT_HLIM 01111111b +127 °C EXT_LLIM 11001001b –55°C In the two temperature data and four threshold setpoint registers, each unit value represents one degree (Celsius). The value is in 2’s-complement binary format such that a reading of 00000000b corresponds to 0°C. Examples of this temperature-to-binary value relationship are shown in the following table. Temperature-to-Digital Value Conversion (INT_TEMP, EXT_TEMP, INT_HLIM, INT_LLIM, EXT_HLIM, EXT_LLIM) Actual Rounded Binary Hex Temperature Temperature Value Value +130.00°C +127 °C 01111111 7F +127.00°C +127 °C 01111111 7F +126.50°C +127 °C 01111111 7F +25.25°C +25 °C 00011001 19 +0.50°C+ 1 °C 00000001 01 +0.25°C0 °C 00000000 00 0.00°C0 °C 00000000 00 –0.25°C0 °C 00000000 00 –0.50°C0 °C 00000000 00 –0.75°C –1°C 11111111 FF –1.00°C –1°C 11111111 FF –25.00°C –25°C 11100111 E7 –25.25°C –25°C 11100110 E7 –54.75°C –55°C 11001001 C9 –55.00°C –55°C 11001001 C9 –65.00°C –65°C 10111111 BF

SMBus Thermal Sensor with External Diode Input TCM1617 TCM1617-1 2/5/99  2001 Microchip Technology Inc. DS21485A Status Register (Status), 8-Bits, Read Only: Status Register (Status) Busy Flag1 Flag2 Flag3 Flag4 Flag5 Reserved Bit POR Function Operation* State D[7] 0 Signal A/D 1 = A/D busy, converter is busy. 0 = A/D idle D[6] 0 Interrupt flag for 1 = interrupt occurred, INT_HLIM event 0 = none D[5] 0 Interrupt flag for 1 = interrupt occurred, INT_LLIM event 0 = none D[4] 0 Interrupt flag for 1 = interrupt occurred, EXT_HLIM event 0 = none D[3] 0 Interrupt flag for 1 = interrupt occurred, EXT_LLIM event 0 = none D[2] 0 External diode 1 = external diode fault, “fault” flag 0 = external diode OK D[1:0] 0 Reserved – N/A Always returns zero. NOTE: All status bits are cleared after a read operation is performed on STATUS. The EXT_TEMP register will read +127°C if an external diode “open” is detected. Name Description POR Read Write State INT_TEMP Internal sensor 0000 0000b* temperature (2’s complement) EXT_TEMP External sensor 0000 0000b* temperature (2’s complement) STATUS STATUS register 0000 0000b CONFIG CONFIG register 0000 0000b CONV_RATE A/D conversion 0000 0010b rate register INT_HLIM Internal high 0111 1111b limit (2’s complement) INT_LLIM Internal low 1100 1001b limit (2’s complement) EXT_HLIM External high 0111 1111b limit (2’s complement) EXT_LLIM External low 1100 1001b limit (2’s complement) MFR_ID ASCII for letter “T” 0101 0100b (Microchip) MFR_REV Serial device ** revision# NOTE: *The INT_TEMP and EXT_TEMP register immediately will be updated by the A/D converter after POR. If STBY# is low at power- up, INT_TEMP and EXT_TEMP will remain in POR state (0000 0000b). **MFR_REV will sequence 01h, 02h, 03h, etc. by mask- ing changes. The TCM1617 ’s register set is summarized below. All registers are 8-bits wide. Manufacturer’s Identification Register (MFR_ID) M S B XX XX X X L S B Manufacturer’s Identification Register (MFR_ID), 8-Bits, Read Only: Manufacturer’s Revision Register (MFR_REV) MSB X X X X X X LSB Manufacturer’s Revision Register (MFR_REV), 8-Bits, Read Only: Register Set Summary:

TCM1617-1 2/5/99 2001 Microchip Technology Inc. DS21485A SMBus Thermal Sensor with External Diode Input MAX. PIN 1 .157 (3.99) .150 (3.81) .196 (4.98) .189 (4.80) .012 (0.31) .008 (0.21) .010 (0.25) .004 (0.10) .069 (1.75) .007 (0.19) .050 (1.27) .016 (0.41) .244 (6.20) .228 (5.80) .025 (0.635) TYP. 16-Pin QSOP (Narrow) PACKAGE DIMENSIONS Dimensions: inches (mm)

SMBus Thermal Sensor with External Diode Input TCM1617 TCM1617-1 2/5/99  2001 Microchip Technology Inc. DS21485A 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 Microchipís 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, except as maybe explicitly expressed herein, under any intellec- reserved. All other trademarks mentioned herein are the property of their respective companies. All rights reserved. © 2001 Microchip Technology Incorporated. Printed in the USA. 1/01 Printed on recycled paper. AMERICAS Corporate Office 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 Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 Atlanta

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