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Global Mixed-mode Technology Inc.

鹵1擄C Remote and 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1擄C (+60擄C to +100擄C, remote)

鹵3擄C (+60擄C to + 100擄C, local)

320碌A(chǔ) (typ) Average Supply Current During

Conversion

+3V to +5.5V Supply Range

Small 8-Lead SO Package

G781

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

thermocouples. Remote accuracy is 鹵1擄C with no cali-

bration needed. The remote channel can also meas-

ure the die temperature of other ICs, such as micro-

processors, that contain an on-chip, diode-connected

transistor.

The 2-wire serial interface accepts standard System

Management Bus (SMBus) Write Byte, Read Byte,

Send Byte, and Receive Byte commands to program

the alarm thresholds and to read temperature data.

The data format is 11bits plus sign, with each bit cor-

responding to 0.125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 G781 is available in a small, 8-pin SOP sur-

face-mount package.

Applications

Desktop and Notebook

Computers

Smart Battery Packs

LAN Servers

Industrial Controllers

Central Office

Telecom Equipment

Test and Measurement

Multi-Chip Modules

Ordering Information

PART*

G781

TEMP. RANGE

-20擄C to +120擄C

PIN-PACKAGE

8-SOP

Pin Configuration

Typical Operating Circuit

3V TO 5.5V

0.1碌F

G781

VCC

DXP

DXN

THERM

1

2

3

4

8

7

6

5

SMBCLK

SMBDATA

ALERT

DXN

DXP

VCC

10k鈩?EACH

SMBCLK

SMBDATA

ALERT

THERM

GND

CLOCK

DATA

INTERRUPT TO 碌C

GND

2N3904

2200pF

8 Pin SOP

Ver: 1.0

Oct 02, 2002

TEL: 886-3-5788833

http://www.gmt.com.tw

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• G781
  英文版
  【1∑C Remote and Local Temperature Sensor with SMBus Serial...
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  G781
• G781
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  【1∑C Remote and Local Temperature Sensor with SMBus Serial...
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