PRELIMINARY INFORMATION 1- WIRE DIGITAL THERMOMETER EVALUATION KIT AVAILABLE TC625 TC625 1-WIRE DIGITAL THERMOMETER FEATURES GENERAL DESCRIPTION ■ ■ ■ ■ ■ The TC625 is a monolithic temperature sensor that generates a pulse train, the high and low times of which vary in direct proportion to the temperature of the device. This technique allows temperature to be accurately measured by the host microcontroller without an A/D converter, and with only a single I/O port pin. The overall accuracy is ±1.5°C typical over the rated measurement range of – 25°C to +100°C. Unlike voltage output temperature sensors, the digital output of the TC625 offers superior immunity to system noise and does not require an A/D converter. Unlike two wire serial temperature sensors, the TC625 communicates over a single wire, and without serial protocol overhead. The TC625 operates from supply voltages as low as 2.7V. Open drain (TC625N) and complimentary (TC625C) output configurations are available. The TC625 is available in TO-92 and SOT-23A-5 packages. ■ ■ Single Wire Interface to Host Microcontroller High Precision ................. ±1°C Accuracy (Typical) Wide Measurement Range .......... – 25°C to +100°C No External Components Required Complimentary (TC625C) or Open Drain Outputs (TC625N) Low Voltage Operation ........................ 2.7V to 5.5V Small Packages ......................... TO-92, SOT-23A-5 APPLICATIONS ■ ■ ■ ■ ■ Isolated Temperature Sensing Environmental Control Systems Process / Industrial Control Systems Power System Temperature Monitoring Process Control Systems FUNCTIONAL BLOCK DIAGRAM ORDERING INFORMATION VDD TEMPERATURE TO VOLTAGE CONVERTER TC625 Part No. Package Output Config. TC625CVNT SOT-23A-5* Complimentary TC625CVZB TO-92-3 Complimentary TC625NVNT SOT-23A-5* Open Drain TC625NVZB TO-92-3 Open Drain TC625EV Evaluation Kit for the TC625 and TC12 NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74A). DELTA SIGMA MODULATOR DOUT PIN CONFIGURATIONS SOT-23A-5* (Top View) TO-92-3 1 2 3 TYPICAL APPLICATION 2.7V to 5.5V MICRO CONTROLLER 5 4 TC625CVZB TC625NVZB I/O 2 3 DOUT VDD GND NOTE: *SOT-23A-3 is equivalent to EIAJ (SC-74A) TC62501 5/13/97 5/13/97 TelCom Semiconductor reserves the right to make changes in the circuitry and TC625-01 1 specifications of its devices. VDD GND MEASUREMENT ZONE 1 DOUT TC625CVNT TC625NVNT TC625 1- WIRE DIGITAL THERMOMETER PRELIMINARY INFORMATION TC625 PACKAGE DIMENSIONS SOT-23A-5* 0.75 (1.90) REFERENCE .071 (1.80) .059 (1.50) .122 (3.10) .098 (2.50) .020 (0.50) .012 (0.30) .037 (0.95) REFERENCE .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .010 (0.25) .004 (0.09) 10° MAX. .006 (0.15) .000 (0.00) .022 (0.55) .008 (0.20) NOTE: *SOT-23A-5 is equivalent to EIAJ (SC-74A). TO-92-3 .165 (4.19) .125 (3.18) .210 (5.33) .170 (4.32) .500 (12.70) MIN. .205 (5.21) .175 (4.45) .105 (2.67) .080 (2.03) .105 (2.67) .095 (2.41) .018 (0.46) .015 (0.38) .135 (3.43) MIN. .055 (1.40) .045 (1.14) .018 (0.46) .015 (0.38) Dimensions: inches (mm) Sales Offices TelCom Semiconductor 1300 Terra Bella Avenue P.O. Box 7267 Mountain View, CA 94039-7267 TEL: 415-968-9241 FAX: 415-967-1590 E-Mail: [email protected] TC625-01 5/12/97 TelCom Semiconductor Austin Product Center 9101 Burnet Rd. Suite 214 Austin, TX 78758 TEL: 512-873-7100 FAX: 512-873-8236 2 TelCom Semiconductor H.K. Ltd. 10 Sam Chuk Street, Ground Floor San Po Kong, Kowloon Hong Kong TEL: 852-2324-0122 FAX: 852-2354-9957 Printed in the U.S.A.