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Global Mixed-mode Technology Inc.

G767

Remote/Local Temperature Sensor with SMBus

Serial Interface

Features

Two Channels: Measures Both Remote and

Local Temperatures

No Calibration Required

SMBus 2-Wire Serial Interface

Programmable Under/Overtemperature Alarms

Supports SMBus Alert Response

Accuracy:

鹵2擄C (+60擄C to + 100擄C, local)

鹵3擄C (-40擄C to +125擄C, local)

鹵3擄C (+60擄C to +100擄C, remote)

3碌A(chǔ) (typ) Standby Supply Current

70碌A(chǔ) (max) Supply Current in Auto- Convert

Mode

+3V to +5.5V Supply Range

Small, 16-Pin SSOP Package

General Description

The G767 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

thermocouples. Remote accuracy is 鹵3擄C for multiple

transistor manufacturers, with no calibration needed.

The remote channel can also measure the die tem-

perature 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.

The G767 is available in a small, 16-pin SSOP sur-

face-mount package.

Applications

Desktop and Notebook

Computers

Smart Battery Packs

LAN Servers

Industrial Controls

Central Office

Telecom Equipment

Test and Measurement

Multi-Chip Modules

Ordering Information

ORDER NUMBER

G767

TEMP. RANGE

-55擄C to +125擄C

PACKAGE

SSOP-16L

Pin Configuration

G767

Typical Operating Circuit

3V TO 5.5V

N.C.

Vcc

DXP

DXN

N.C.

ADD1

GND

1

2

3

4

5

6

7

16

15

14

13

12

11

10

9

N.C

STBY

SMBCLK

N.C.

SMBDATA

ALERT

ADD0

N.C.

2N3904

0.1 碌F

200

惟

Vcc

STBY

10k EACH

DXP

SMBCLK

SMBDATA

CLOCK

DATA

INTERRUPT

TO 碌C

2200

pF

DXN

ALERT

ADD0 ADD1 GND

GND 8

SSOP-16L

Ver: 2.4

May 23, 2003

TEL: 886-3-5788833

http://www.gmt.com.tw

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