G7921 datasheet(1/1 Pages) GMT

номер детали	G7921

подробное описание детали	Three Remote Temperature Sensors and One Fan Controllers with SMBus Serial Interface and System Reset Circuit

PDF	1 Pages

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производитель	GMT [Global Mixed-mode Technology Inc]

домашняя страница	http://www.gmt.com.tw

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Ver: 0.3

Jan 30, 2008

TEL: 886-3-5788833

http://www.gmt.com.tw

1

G7921

Global Mixed-mode Technology Inc.

Three Remote Temperature Sensors and One Fan

Controllers with SMBus Serial Interface and System

Reset Circuit

Features

Measures Three Remote Temperatures

Adjustable Offset for Each Sensor via SMBus

Accuracy: ±1°C (+ 60°C to + 100°C)

±3°C (- 10°C to + 120°C)

+4.5V to +5.5V Supply Range

Programmable Hardware Thermal Shutdown

for Sensor 2 and Programmable Software

Thermal Shutdown for Sensor 1, 3.

SMBus 2-Wire Serial Interface With Writting

Protection Function.

Alert Signal for Diode Fault, Fan Fail, and Fan

Out of Control

Supports SMBus Alert Response

Fan Drivers Using Linear Control Algorithm

with Built-in MOSFET

Closed Loop Speed Control and programmable

8 Bits Open Loop Voltage Control for Fan1

Wide speed control range for Fan1, Accuracy

within 2%, when SET_CNT1 > 50

Internal Current- limit and Over-temperature

Protection for the Fan

Reset Function Precision Monitoring of 5V

Power-Supply Voltage

Measure Thermal Diode with Transistor Model

Support 45nm, 65nm and 90nm CPU thermal

diode

20-Pin SSOP Package

Applications

Desktop and Notebook

Central Office Computers

Telecom Equipment

Smart Battery Packs

Industrial Controls

LAN Servers

Pin Configuration

General Description

The G7921 contains 3 precise digital thermometers,

one fan controllers, hardware and software thermal

shutdown, and a system-reset circuit.

The thermometers report the temperature of 3 remote

sensors. The remote sensors are diode-connected tran-

sistors typically a low-cost, easily mounted 2N3904 NPN

type or the diode built-in in CPU. Remote accuracy is

±1°C for multiple transistor manufacturer. The G7921

also support offset adjust function via SMBus to fix the

error due to different CPU diode or parasitic resistors.

The 2-wire serial interface accepts standard System

Management Bus (SMBusTM) Write Byte, Read Byte,

Send Byte, and Receive Byte commands. The SMBus

address is 7ah for write and 7bh for read, and sup-

ports writting protection function by command 20h to

prevent error behavior of µP.

G7921 contains one fan controllers. FAN1 controller

performs closed-loop and open-loop control. G7921

determines the current fan speed based on the FG

inputs and an externally supplied 32.768KHz clock.

The driving ability of FAN1 is 500mA. G7921 also pro-

vide ALERT for fan fail and out of control event.

The G7921 provides hardware and software thermal

shutdown. The hardware thermal shutdown is for the

sensor 2. The trigger point is set by external resistors.

The trigger points of software thermal shutdown are

set via SMBus. If thermal shutdown event occurs,

THERM

pin outputs low.

The G7921 contains a microprocessor (µP) supervi-

sory circuit used to monitor the power supplies in µP

and digital systems. Reset threshold is set to 4.38V

typical.

Ordering Information

ORDER

NUMBER

MARKING

TEMP.

RANGE

PACKAGE

G7921SF1U

G7921

-55°Cto+125°C

SSOP-20

Note: SF: SSOP-20

1: Bonding Code

U: Tape & Reel

SMBusTM is a trademark of Intel Corp.

DVCC

N.C.

SCL

DGND

SDA

ALERT

CLK

FAN1

THERM_SET

FG1

DGND

VCC

DXP1

DXN1

DXP2

SGND2

G7921

SSOP-20

13

20

19

18

17

16

15

5

6

7

8

9

10

1

4

3

2

14

RESET

THERM

11

12

DXN3

DXP3

DVCC

N.C.

SCL

DGND

SDA

ALERT

CLK

FAN1

THERM_SET

FG1

DGND

VCC

DXP1

DXN1

DXP2

SGND2

G7921

SSOP-20

13

20

19

18

17

16

15

5

6

7

8

9

10

1

4

3

2

14

RESET

THERM

11

12

DXN3

DXP3

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