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Two Remote Temperature Sensors with

SMBus Serial Interface and System Reset

Features

Description

Two channels: measures both remote and local

temperatures

No calibration required

SMBus 2-wire serial interface

Programmable under/over-temperature alarms

SMBus alert response supported

Accuracy:

±1°C (+60°C to +100°C, remote)

±3°C (+60°C to + 100°C, local)

Average supply current during conversion of

320µA (typ)

Supply range of +3V to +5.5V

Small 8-lead SO package

Applications

Desktop and Notebook

Central Office

Computers

Telecom Equipment

Smart Battery Packs

Test and Measurement

LAN Servers

Multi-Chip Modules

Industrial Controllers

Packing type

TR: Tape and reel

SS8017XX

Example: SS8017TR

à SS8017 shipped in tape and reel

Ordering Information

The SS8017 contains a precise digital thermometer, a

system-reset circuit, and a programmable thermal

shutdown signal.

The thermometer reports the temperature of two re-

mote

sensors.

The

remote

sensors

are

di-

ode-connected transistors, typically a low-cost, easily

mounted 2N3904 NPN type which replaces conven-

tional thermistors or thermocouples. Remote accuracy

is ±5°C for multiple transistor manufacturers, with no

calibration needed. The remote channel can also

measure the die temperature of other ICs, such as mi-

croprocessors,

that

contain

an

on-chip,

di-

ode-connected transistor.

The 2-wire serial interface accepts standard System

Management Bus (SMBus

Send Byte, and Receive Byte commands to program

the alarm thresholds and to read temperature data. The

data format is 7 bits plus sign, with each bit corre-

sponding to 1°C, in two’s-complement format. Meas-

urements can be done automatically and autono-

mously, with the conversion rate programmed by the

user or programmed to operate in a single-shot mode.

The adjustable rate allows the user to control the

supply-current drain.

SS8017

Rev.2.01 6/06/2003