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Datasheet G7921 PDF ( 特性, スペック, ピン接続図 )

部品番号 G7921
部品説明 Three Remote Temperature Sensors and One Fan Controllers
メーカ Global Mixed-mode Technology
ロゴ Global Mixed-mode Technology ロゴ 
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G7921 Datasheet, G7921 PDF,ピン配置, 機能
Global Mixed-mode Technology Inc.
G7921
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
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.
Pin Configuration
G7921
FAN1
RESET
THERM_SET
FG1
DGND
VCC
DXP1
DXN1
DXP2
SGND2
1
2
3
4
5
6
7
8
9
10
20 DVCC
19 N.C.
18 SCL
17 DGND
16 SDA
15 ALERT
14 CLK
13 THERM
12 DXN3
11 DXP3
Ordering Information
ORDER
NUMBER
MARKING
G7921SF1U
G7921
Note: SF: SSOP-20
1: Bonding Code
U: Tape & Reel
TEMP.
RANGE
-55°C to +125°C
PACKAGE
SSOP-20
SMBusTM is a trademark of Intel Corp.
SSOP-20
Ver: 0.3
Jan 30, 2008
TEL: 886-3-5788833
http://www.gmt.com.tw
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