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| TC74 Tiny Serial Digital Thermal Sensor Features * * * * Digital Temperature Sensing in SOT-23-5 Package Outputs Temperature as an 8-Bit Digital Word Simple Serial Port Interface Solid-State Temperature Sensing: - 2C Accuracy from +25C to +85C - 3C Accuracy from 0C to +125C * 3.0 and 5.5V Operating Range * Low Power: - 200A Operating - 5A Standby Mode General Description 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. Communication with the TC74 is accomplished via a 2wire SMBus/I2CTM 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. Power consumption is only 200A typ, (5A Standby, 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. 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 Functional Block Diagram Package Type Internal Sensor (Diode) Serial Port Interface SDA TO-220 Modulator SCL TC74 Control Logic 12345 SDA 5 NC SDA GND SCLK VDD Temperature Register SOT-23 SCLK 4 TC74 1 NC 2 GND 3 VDD 2002 Microchip Technology Inc. DS21462B-page 1 (c) TC74 Device Selection Table Part Number TC74A0-3.3VCT TC74A1-3.3VCT TC74A2-3.3VCT TC74A3-3.3VCT TC74A4-3.3VCT TC74A5-3.3VCT* TC74A6-3.3VCT TC74A7-3.3VCT TC74A0-5.0VCT TC74A1-5.0VCT TC74A2-5.0VCT TC74A3-5.0VCT TC74A4-5.0VCT TC74A5-5.0VCT* TC74A6-5.0VCT TC74A7-5.0VCT TC74A0-3.3VAT TC74A1-3.3VAT TC74A2-3.3VAT TC74A3-3.3VAT TC74A4-3.3VAT TC74A5-3.3VAT TC74A6-3.3VAT TC74A7-3.3VAT TC74A0-5.0VAT TC74A1-5.0VAT TC74A2-5.0VAT TC74A3-5.0VAT TC74A4-5.0VAT TC74A5-5.0VAT TC74A6-5.0VAT TC74A7-5.0VAT NOTE: *Default Address. Package SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 SOT-23A-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 TO-220-5 Address 1001 000 1001 001 1001 010 1001 011 1001 100 1001 101* 1001 110 1001 111 1001 000 1001 001 1001 010 1001 011 1001 100 1001 101 1001 110 1001 111 1001 000 1001 001 1001 010 1001 011 1001 100 1001 101 1001 110 1001 111 1001 000 1001 001 1001 010 1001 011 1001 100 1001 101 1001 110 1001 111 Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125c -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C (c) DS21462B-page 2 2002 Microchip Technology Inc. TC74 1.0 ELECTRICAL CHARACTERISTICS *Stresses above those listed under "Absolute Maximum Ratings" may cause permanent 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 operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. Absolute Maximum Ratings* Supply Voltage (V DD) ............................................ +6V Voltage On Any Pin ....... (GND - 0.3V) to (VDD + 0.3V) Current On Any Pin .......................................... 50 mA Operating Temperature (TA)........................ See Below Storage Temperature (TSTG) .............. -65C to +150C TC74 ELECTRICAL SPECIFICATIONS Electrical Characteristics: VDD = 3.3V or 5.0V (Note 5), -40C TA 125C, unless otherwise noted. Symbol Power Supply VPOR IDD IDD-STANDBY Power-on Reset Threshold Operating Current Standby Supply Current 1.2 -- -- -- 200 5 2.2 350 10 V A A VDD Falling Edge or Rising Edge VDD = 5.5V Serial Port Inactive (Note 1) VDD = 3.3V Serial Port Inactive (Note 1) +25C CR VIH VIL VOL CIN ILEAK Note 1: 2: 3: 4: 5: Conversion Rate Logic Input High Logic Input Low SDA Output Low Input Capacitance SDA, SCL I/O Leakage 8 -- -- -- -- 5 0.1 Sps V V V V pF A Serial Port Interface IOL = 3 mA IOL = 6 mA (Note 3) Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. SDA and SCLK must be connected to VDD or GND. VDD = 3.3V for TC74X -3.3VCT. VDD = 5.0V for TC74X -5.0VCT. 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 VDD change. 2002 Microchip Technology Inc. DS21462B-page 3 (c) TC74 TC74 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: VDD = 3.3V or 5.0V (Note 5), -40C TA 125C, CL = 80pF unless otherwise noted. Serial Port AC Timing Symbol fSMB tLOW tHIGH tR tF tSU(START) tH(START) tSU-DATA tH-DATA tSU(STOP) tIDLE tPOR Note 1: 2: 3: 4: 5: Parameter SMBus Clock Frequency Low Clock Period High Clock Period SMBus Rise Time SMBus Fall Time START Condition Setup Time (for repeated START Condition) START Condition Hold Time Data In Setup Time Data In Hold Time STOP Condition Setup Time Bus Free Time Prior to New Transition Power-on Reset Delay Min 10 4.7 4 -- -- 4 4 1000 1250 4 4.7 -- Typ. -- -- -- -- -- -- -- -- -- -- -- 500 Max 100 -- -- 1000 300 -- -- -- -- -- -- -- Unit kHz sec sec nsec nsec sec sec nsec nsec sec sec sec Test Conditions 10% to 10% 90% to 90% 10% to 90% 90% to10% 90% SCLK to 10% SDA VDD VPOR (Rising Edge) Operating current is an average value integrated over multiple conversion cycles. Transient current may exceed this specification. Maximum ensured conversion time after Power-on Reset (POR to DATA_RDY) is 250 msec. Output current should be minimized for best temperature accuracy. Power dissipation within the TC74 will cause self-heating and temperature drift error. SDA and SCLK must be connected to VDD or GND. VDD = 3.3V for TC74X -3.3VCT. VDD = 5.0V for TC74X -5.0VCT. 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 VDD change. (c) DS21462B-page 4 2002 Microchip Technology Inc. TC74 2.0 PIN DESCRIPTIONS The descriptions of the pins are listed in Table 2-1. TABLE 2-1: PIN FUNCTION TABLE Symbol NC GND VDD SCLK SDA Type None Power Power Input Bi-directional Description No Internal Connection. System Ground Power Supply Input SMBus Serial Clock SMBus Serial Data Pin Number Pin Number (5-Pin SOT-23) (5-Pin TO-220) 1 2 3 4 5 1 3 5 4 2 2002 Microchip Technology Inc. DS21462B-page 5 (c) TC74 Timing Diagrams SMBUS READ Timing Diagram A B ILOW IHIGH C D E F G H I J K SCL SDA tSU(START) tH(START) A = START Condition B = MSB of Address Clocked into Slave C = LSB of Address Clocked into Slave D = R/W Bit Clocked into Slave tSU-Data 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 I = Acknowledge Clock Pulse J = STOP Condition K = New START Condition tSU(STOP) tIDLE SMBUS Write Timing Diagram A ILOW B IHIGH C D E F G H I J K L M SCL SDA tSU(START) tH(START) 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 tSU-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 tH-DATA J = Acknowledge Clocked into Master K = Acknowledge Clock Pulse L = STOP Condition, Data Executed by Slave M = New START Condition tSU(STOP) tIDLE (c) DS21462B-page 6 2002 Microchip Technology Inc. TC74 3.0 3.1 DETAILED DESCRIPTION Functional Description TABLE 3-2: Term Transmitter Receiver Master SERIAL BUS CONVENTIONS Explanation The device sending data to the bus. The device receiving data from the bus. The device which controls the bus: initiating transfers (START), generating the clock, and terminating transfers. (STOP) The device addressed by the master. A unique condition signaling the beginning of a transfer indicated by SDA falling (High-Low) while SCL is high. A unique condition signaling the end of a transfer indicated by SDA rising (Low-High) while SCL is High. 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. Communication is not possible because the bus is in use. When the bus is idle, both SDA and SCL will remain high. 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.) 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 read through the serial port. The system interface is a slave SMBus. The temperature data can be read at any time through the SMBus port. Eight SMBus 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. Slave START STOP 3.1.1 STANDBY MODE ACK The TC74 allows the host to put it into a low power (IDD = 5A, typical) Standby mode. In this mode, the A/D converter is halted and the temperature data registers are frozen. The SMBus port operates normally. Standby mode is enabled by setting the SHDN bit in the CONFIG register. Table 3-1 summarizes this operation. Busy NOT Busy Data Valid TABLE 3-1: SHDN Bit 0 1 STANDBY MODE OPERATION Operating Mode Normal Standby 3.1.2 SMBUS SLAVE ADDRESS The TC74 is internally programmed to have a default SMBus address value of 1001 101b. Seven other addresses are available by custom order (contact factory). 3.2 Serial Port Operation The Serial Clock input (SCL) and bi-directional data port (SDA) form a 2-wire bi-directional serial port for programming and interrogating the TC74. The following conventions 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 TC74 always operates as a Slave. The serial protocol is illustrated in Figure 3-1 All data transfers have two phases; 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 SCL is LOW (SDA changes while SCL is HIGH are reserved for START and STOP Conditions). 2002 Microchip Technology Inc. DS21462B-page 7 (c) TC74 FIGURE 3-1: SMBUS PROTOCOLS Write Byte Format S Address 7 Bits Slave Address WR ACK Command 8 Bits ACK Data 8 Bits ACK P 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 7 Bits Slave Address WR ACK Command 8 Bits ACK S Address 7 Bits RD ACK Data 8 Bits NACK P Command Byte: selects which register you are reading from. 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 7 Bits S = START Condition P = STOP Condition Shaded = Slave Transmission RD ACK Data 8 Bits Nack P Data Byte: reads data from the register commanded by the last Read Byte or Write Byte transmission. 3.3 START Condition (S) 3.6 Data Byte The TC74 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. 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 after a successful write of a data byte into the TC74. 3.4 Address Byte 3.7 STOP Condition (P) Communications must be terminated by a STOP condition (a LOW to HIGH transition of SDA while SCL is HIGH). The STOP Condition must be communicated by the transmitter to the TC74. NOTE: Refer to Timing Diagrams for serial bus timing. Immediately following the START Condition, the host must transmit the address byte to the TC74. The states of A1 and A0 determine the 7-bit SMBus 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 to indicate 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 eight bits of data or address. (c) DS21462B-page 8 2002 Microchip Technology Inc. TC74 4.0 REGISTER SET AND PROGRAMMER'S MODEL COMMAND BYTE DESCRIPTION (SMBUS READ_BYTE AND WRITE_BYTE) FUNCTION Read Temperature (TEMP) Read/Write Configuration (CONFIG) TABLE 4-3: D[7] MSB D[6] X TEMPERATURE REGISTER (TEMP) D[5] X D[4] X D[3] X D[2] X D[1] X D[0] LSB TABLE 4-1: COMMAND CODE RTR RWCR 00h 01h In the temperature data registers, each unit value represents 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. TABLE 4-4: TEMPERATURE TO DIGITAL VALUE CONVERSION (TEMP) REGISTERED TEMP. +127C +127C +127C +25C +1C 0C 0C 0C 0C -1C -1C -25C -25C -55C -55C -65C TABLE 4-2: CONFIGURATION REGISTER (CONFIG); 8 BITS, READ/ WRITE) FUNCTION STANDBY Switch Data Ready* Reserved Always returns zero when read ACTUAL TEMP. +130.00C +127.00C +126.50C +25.25C +0.50C +0.25C 0.00C -0.25C -0.50C -0.75C -1.00C -25.00C -25.25C -54.75C -55.00C -65.00C BINARY HEX 0111 1111 0111 1111 0111 1111 0001 1001 0000 0001 0000 0000 0000 0000 0000 0000 0000 0000 1111 1111 1111 1111 1110 0111 1110 0110 1100 1001 1100 1001 1011 1111 BIT D[7] D[6] D[5]-D[0] POR 0 0 0 TYPE OPERATION Read/ Write Read Only N/A 1 = standby, 0 = normal 1 = ready 0 = not ready N/A *Note: DATA_RDY bit RESET at power-up and SHDN enable. FIGURE 4-1: DATA_RDY, SHDN OPERATION LOGIC DIAGRAM VDD 4.2 DATA_RDY Register Set Summary The TC74 register set is summarized in Table 4-5. All registers are 8 bits wide. TABLE 4-5: SHDN tconv tconv TC74 REGISTER SET SUMMARY POR State 0000 0000b* READ WRITE NAME DESCRIPTION Internal Sensor Temp. (2's Complement) CONFIG Register 4.1 Temperature Register (TEMP), 8 Bits, READ ONLY TEMP 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. CONFIG 0000 0000b *Note: The TEMP resigister will be immediately updated by the A/D converter after the DATA_RDY Bit goes High. 2002 Microchip Technology Inc. DS21462B-page 9 (c) TC74 5.0 5.1 PACKAGING INFORMATION Package Marking Information SOT-23 TABLE 5-1: TC74 (V) PACKAGE MARKING CODES Code V0 V1 V2 V3 V4 V5 V6 V7 U0 U1 U2 U3 U4 U5 U6 U7 TC74A0-3.3VCT TC74A1-3.3VCT TC74A2-3.3VCT TC74A3-3.3VCT 1 2 3 4 TC74A4-3.3VCT TC74A5-3.3VCT TC74A6-3.3VCT TC74A7-3.3VCT 1 & 2 = part number code + temperature range and voltage 3 = year and quarter code 4 = lot ID number TC74A0-5.0VCT TC74A1-5.0VCT TC74A2-5.0VCT TC74A3-5.0VCT TC74A4-5.0VCT TC74A5-5.0VCT TC74A6-5.0VCT TC74A7-5.0VCT (c) DS21462B-page 10 2002 Microchip Technology Inc. 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 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 5.3 Package Dimensions SOT-23A-5 .075 (1.90) REF. .122 (3.10) .098 (2.50) .020 (0.50) .012 (0.30) PIN 1 .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) .071 (1.80) .059 (1.50) .037 (0.95) REF. 10 MAX. .024 (0.60) .004 (0.10) .010 (0.25) .004 (0.09) Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21462B-page 11 (c) TC74 NOTES: (c) DS21462B-page 12 2002 Microchip Technology Inc. TC74 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. DS21462B-page 13 (c) TC74 NOTES: (c) DS21462B-page 14 2002 Microchip Technology Inc. TC74 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, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. 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. DS21462B-page 15 (c) WORLDWIDE SALES AND SERVICE 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 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 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 Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-7456 China - Beijing Microchip Technology Consulting (Shanghai) Co., Ltd., Beijing Liaison Office Unit 915 Bei Hai Wan Tai Bldg. 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Unit 901-6, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 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 Toronto 6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 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 United Kingdom Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 03/01/02 (c) DS21462B-page 16 2002 Microchip Technology Inc. *B26412SD* |
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