Datasheet > G781

G781

更新时间： 2024-10-30 17:01:35

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描述
Remote up to 160°C

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中文翻译

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G781 数据手册

Global Mixed-mode Technology

G781

±1°C Remote and Local Temperature Sensor with

SMBus Serial Interface

Features

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 tran-

sistor 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.

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

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°C, in two’s-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.

+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” sec-

tion)

Applications

Desktop and Notebook

Computers

Smart Battery Packs

LAN Servers

Central Office

The G781 and G781-1 have the same functions but

different SMBus slave addresses. This allows for one

of each to be on the bus at the same time.

Telecom Equipment

Test and Measurement

Multi-Chip Modules

Industrial Controllers

The G781 is available in a small, 8-pin SOP, MSOP

and TDFN surface-mount package.

Ordering Information

ORDER NUMBER

(Pb free/Green)

G781f

TEMP.

RANGE

MARKING

PACKAGE

G781

-55°C to +125°C

SOP-8

MSOP-8

G781P8f

G781RDf

G781-1f

781

TDFN3X3-8

SOP-8

G781-1

781-1

G781-1P8f

G781-1RDf

MSOP-8

TDFN3X3-8

Pin Configuration

Typical Application Circuit

3V TO 5.5V

0.1µF

G781/G781-1

VCC

SMBCLK

10kΩ EACH

VCC

DXP

DXN

SMBCLK

SMBDATA

ALERT

DXP

CLOCK

DATA

SMBDATA

ALERT

SMBCLK

DXP

DXN

Thermal

Pad

SMBDATA

ALERT

DXN

INTERRUPT TO µC

THERM

GND

2200pF

2N3904

THERM

GND

TDFN3X3-8

SOP-8/MSOP-8

Note: Recommend connecting the Thermal Pad to the GND or let it keep floating.

Ver: 2.4

Dec 28, 2012

TEL: 886-3-5788833

http://www.gmt.com.tw

中文翻译

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