[Global Mixed-mode Technology]

General Description

The G781 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. The remote sensor is a diode-connected transistor typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermistors or thermo couples. Remote accuracy is ±1°C with no calibration needed. It also has a build-in noise filtering function in remote sensor measuring the diode temperature. The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor.

Features

■ Two Channels: Measures Both Remote and

Local Temperatures

■ No Calibration Required

■ Built-in Noise-Buster for Remote Sensor

■ SMBus 2-Wire Serial Interface

■ Programmable Under/Overtemperature Alarms

■ Supports SMBus Alert Response

■ Accuracy:

±1°C (+60°C to +100°C, remote)

±3°C (+60°C to + 100°C, local)

■ 320µA (typ) Average Supply Current During Conversion

■ +3V to +5.5V Supply Range

■ Small 8-Lead SOP , MSOP and TDFN Package

■ Remote Temperature Measurment up to 160°C

by using offset shifting method (see “Measure

Remote Temperature Higher Than 127°C” section)

Applications

Desktop and Notebook

Central Office

Computers

Telecom Equipment

Smart Battery Packs

Test and Measurement

LAN Servers

Multi-Chip Modules

Industrial Controllers