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參數(shù)資料
| 型號： | G768D |
| 英文描述： | ± 3oC remote thermal sensor with one fan control and SMBus interface.|Thermal Sensor / Detector Series |
| 中文描述： | ± 3oC遠(yuǎn)程溫度傳感器一個風(fēng)扇控制和SMBus接口。|熱傳感器/探測器系列 |
| 文件頁數(shù)： | 2/16頁 |
| 文件大?。?/td> | 323K |
| 代理商： | G768D |
Ver: 1.4
May 23, 2003
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G768D
Global Mixed-mode Technology Inc.
It uses LDO method and an on-chip MOSFET to con-
trol the fan speed to ±2% of the programmed speed.
The desired fan speed is also programmed via
SMBus
TM
. The actual fan speed and fan status can be
read via the SMBus
TM
. Short-circuit protection is im-
plemented to prevent damages to the fan and this IC
itself. The accepted frequency of fan rotation pulses is
100~1000Hz, which corresponds to 3,000 to 30,000
rpm for a typical fan that produces two pulses per
revolution. The G768D also turns on the fans by hard-
ware watchdog system. The fan controller would fully
turn on the fan when any of the following conditions
happens.
1. when either of the remote temperature is higher than
its own T
MAX
.
2.when either of these two remote diodes is open.
3.when both remote diodes are short.
Typical Operating Circuit
The G768D also contains a microprocessor (μP) su-
pervisory circuit used to monitor the power supplies in
μP and digital systems. They provide excellent circuit
reliability and low cost by eliminating external compo-
nents and adjustments when used with 5V-powered
circuits. This circuit asserts a reset signal whenever
the V
CC
supply voltage declines below a preset
threshold, keeping it asserted for at least 140ms after
V
CC
has risen above the reset threshold. The G768D
has an active-low RESET output. The reset com-
parator is designed to ignore fast transients on V
CC
.
Reset threshold of this circuit is set to 4.4V typical.
The G768D is available in a small, 16-pin SSOP sur-
face-mount package.
INTERRUPT TO μC
1μF
FANVCC
FG
DXP1
DXN
DXP2
RESET
GND
2200pF
2200pF
2N3904
2N3904
10k EACH
SMBCLK
SMBDATA
CLOCK 32.768kHz
IN
FAN1
FG
TH_SHUT
SMBCLK
SMBDATA
ALERT
CLK
G768D
RESET
μP
10μF
VCC
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