Keystone Electronics 781-B

[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