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Global Mixed-mode Technology Inc.

G771

Two Remote Temperature Sensors with SMBus

Serial Interface and System Reset Circuit

Features

Measures Two Remote Temperatures

No Calibration Required

SMBus 2-Wire Serial Interface

Programmable Under/Over-temperature Alarms

Programmable Thermal Shutdown Signal

Supports SMBus Alert Response

Accuracy: 鹵5擄C (-40擄C to + 125擄C, remote)

鹵3擄C (+60擄C to + 100擄C, remote)

4.5V to 5.5V Supply Range

Precision Monitoring of 5V Power-Supply

Voltage

140ms Min Power-On Reset Pulse Width

RESET Output

Guaranteed RESET Valid to V

CC

=1V

Power Supply Transient Immunity

No External Components needed for reset

function

Small, 16-Pin SSOP Package

General Description

The G771 contains a precise digital thermometer, a

system-reset circuit, and a programmable thermal

shutdown signal.

The thermometer reports the temperature of 2 remote

sensors. The remote sensors are diode-connected

transistors typically a low-cost, easily mounted

2N3904 NPN type that replace conventional thermis-

tors or thermocouples. Remote accuracy is 鹵5擄C for

multiple transistor manufacturers, with no calibration

needed. The remote channel can also measure the die

temperature of other ICs, such as microprocessors,

that contain an on-chip, diode-connected transistor.

The 2-wire serial interface accepts standard System

Management Bus (SMBus

TM

) Write Byte, Read Byte,

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 cor-

responding to 1擄C, in two鈥檚-complement format.

Measurements can be done automatically and

autonomously, 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.

Applications

Desktop and Notebook

Central Office Computers

Telecom Equipment

Smart Battery Packs

Test and Measurement

LAN Servers

Multi-Chip Modules

Industrial Controls

Ordering Information

PART*

G771

TEMP. RANGE

-55擄C to +125擄C

PIN-PACKAGE

16SSOP

Pin Configuration

G771

NC

Vcc

DXP1

DXN

DXP2

NC

DGND

AGND

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

TH_SHUT(push-pull)

NC

SMBCLK

NC

SMBDATA

ALERT

NC

RESET

16Pin SSOP

Ver 0.2 Preliminary

Dec 11, 2001

TEL: 886-3-5788833

http://www.gmt.com.tw

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