FM75 Low-Voltage Two-Wire Digital Temperature Sensor with Thermal Alarm

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FM75 Low-Voltage Two-Wire Digital Temperature Sensor with Thermal Alarm

December 2006

FM75 Low-Voltage Two-Wire Digital Temperature Sensor with Thermal Alarm
Features
User Configurable to 9, 10, 11 or 12-bit Resolution Precision Calibrated to 1 C, 0 C to 100 C

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Description
The FM75 contains a high-precision CMOS temperature sensor, a Delta-Sigma analog-to-digital converter, and a SMBus-compatible serial digital interface. Typical accuracy is 2 C over the full temperature range of 40 C to 125 C and to 1 C over the range of 0 C to 100 C, with 9- to 12-bit resolution (default is 9). Thermal alarm output, over-limit signal (OS) supports interrupt and comparator modes. OS is active if the userprogrammable trip-temperature is exceeded. When the temperature falls below the trip temperature, plus the user-programmable hysteresis limit, the OS is disabled. Available in a surface mount SOIC-8 (SOP-8) package.

Typical
Temperature Range: -40 C to 125 C Low Operating Current (less than 250 A) Low Self Heating (0.2 C max. in still air) Operating Voltage Range: 2.7V to 5.5V

Applications
Battery Management FAX Management Printers Portable Medical Instruments HVAC Systems Power Supply Modules Disk Drives Computers Automotive Components

Application Diagram
2.7 to 5.5V
8

A0
User Programmable Address

7 6 5

A1 A2

FM75
8-Pin Configuration

3

OS

SMBus Interface

SDA SCL

1 2

4

Figure 1. Typical Application Diagram

Ordering Information
Part Number
FM75M8x
2006 Fairchild Semiconductor Corporation FM75 Rev. 1.0.8

Package
8-Lead SOIC

Temperature Range
-40 C to 125 C

Packing Method
2500 Units, Tape and Reel
www.fairchildsemi.com

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