G768BF

更新时间： 2024-10-29 13:07:55

品牌	Logo	应用领域
致新 - GMT		风扇传感器温度传感器复位电路控制器
页数	文件大小	规格书
16页	343K
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中文翻译

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数据手册

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G768BF 数据手册

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troller with SMBus Serial Interface and System Reset

Circuit

Features

General Description

^ꢀMeasures Two Remote Temperatures

^ꢀNo Calibration Required

The G768D contains a precise digital thermometer, a

fan controller, and a system-reset circuit.

^ꢀSMBus 2-Wire Serial Interface

^ꢀProgrammable Under/Over-temperature Alarms

^ꢀProgrammable Thermal Shutdown Signal

^ꢀSupports SMBus Alert Response

^ꢀAccuracy: ±5°C (-40°C to + 125°C, remote)

±3°C (+60°C to + 100°C, remote)

^ꢀ+4.5V to +5.5V Supply Range

^ꢀFan speed control range: 3,000 to 30,000 rpm

^ꢀFan speed accuracy: ±2%

Except for one less fan controller, G768D is backward

compatible with G768B. G768D has 2 more functions,

fan-failure detection and programmable thermal shut-

down signal.

The thermometer reports the temperature of 2 remote

sensors. The remote sensors are diode-connected

transistors typically

low-cost, easily mounted

2N3904 NPN type that replace conventional thermis-

tors 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 microprocessors,

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

^ꢀBuilt-in MOSFET switch

^ꢀInternal current-limit and over-temperature

protection for fan control

^ꢀWatchdog for fan control

^ꢀAlarm for fan failure

^ꢀPrecision Monitoring of 5V Power-Supply

Voltage

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°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.

^ꢀ340ms Typical 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

Applications

^ꢀDesktop and Notebook

^ꢀCentral Office Computers

^ꢀTelecom Equipment

^ꢀSmart Battery Packs

^ꢀTest and Measurement

^ꢀLAN Servers

G768D also contains a fan speed controller. It connects

directly to the fans and performs closed-loop control of

the fan speed independently. The only external compo-

nent required is a 10µF capacitor per channel. It deter-

mines the current fan speed based on the fan rotation

pulses and an externally supplied 32.768KHz clock.

^ꢀMulti-Chip Modules

^ꢀIndustrial Controls

Pin Configuration

Ordering Information

G768D

PART NUMBER TEMP. RANGE PIN-PACKAGE

G768D

-55°C to +125°C

16SSOP

FANVCC

Vcc

TH_SHUT

Vcc

DXP1

SMBCLK

DXN

SMBDATA

DXP2

ALERT

RESET

DGND

10 FG

CLK

AGND

16Pin SSOP

TEL: 886-3-5788833

Ver: 1.2

http://www.gmt.com.tw

Apr 03, 2002

12 3 4 5 6 7...16

中文翻译

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与G768BF相关器件

型号	品牌	获取价格	描述	数据表
G768D	GMT	获取价格	Two Remote Temperature Sensors and One Fan Controller with SMBus Serial Interface and Syst
G771	GMT	获取价格	Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit
G775-0U	ETC	获取价格	Single Phase Full Wave Bridge Retifiers
G-775-10	MOLEX	获取价格	Ring Terminal
G7751-02	HAMAMATSU	获取价格	Infrared detector module with preamp
G7751-21	HAMAMATSU	获取价格	Infrared detector module with preamp
G-775-14	MOLEX	获取价格	Ring Terminal,
G-775-14T	MOLEX	获取价格	Ring Terminal
G775-1U	ETC	获取价格	Single Phase Full Wave Bridge Retifiers
G7752-10	HAMAMATSU	获取价格	Infrared detector module with preamp

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