TC74A0-50VAT

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: - ±2°C Accuracy from +25°C to +85°C - ±3°C Accuracy from 0°C to +125°C • 3.0 and 5.5V Operating Range • Low Power: - 200µA Operating - 5µA 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/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 1°C. Conversion rate is a nominal 8 samples/sec. Power consumption is only 200µA typ, (5µA 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 © 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 -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°c -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°C -40°C to +125°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) .............. -65°C to +150°C TC74 ELECTRICAL SPECIFICATIONS Electrical Characteristics: VDD = 3.3V or 5.0V (Note 5), -40°C ≤ TA ≤ 125°C, 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 µA µA VDD Falling Edge or Rising Edge VDD = 5.5V Serial Port Inactive (Note 1) VDD = 3.3V Serial Port Inactive (Note 1) +25°C