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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/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. 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.

Features

? Digital Temperature Sensing in SOT-23-5 or TO-220 Packages

? Outputs Temperature as an 8-Bit Digital Word

? Simple SMBus/I2C? 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

? Low Power:

- 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