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參數資料
| 型號： | ADT7470ARQZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 7BIT(s), RECTANGULAR, SURFACE MOUNT |
| 封裝： | ROHS COMPLIANT, MO-137AB, QSOP-16 |
| 文件頁數： | 1/40頁 |
| 文件大小： | 962K |
| 代理商： | ADT7470ARQZ |
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Temperature Sensor Hub and Fan Controller
ADT7470
Rev. C
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
200
4–2009 Analog Devices, Inc. All rights reserved.
FEATURES
Monitors up to 10 remote temperature sensors
Monitors and controls speed of up to 4 fans independently
PWM outputs drive each fan under software control
FULL_SPEED input allows fans to be blasted to maximum
speed by external hardware
SMBALERT interrupt signals failures to system controller
Three-state ADDR pin allows up to 3 devices on a single bus
Temperature decoder interprets TMP05 temperature sensors
and communicates values over I2C bus
Limit comparison of all monitored values
Supports fast I2C standard (400 kHz max)
Meets SMBus 2.0 electrical specifications
(fully SMBus 1.1-compliant)
APPLICATIONS
Servers
Networking and telecommunications equipment
Desktops
GENERAL DESCRIPTION
The ADT74701 controller is a multichannel temperature sensor
and PWM fan controller and fan speed monitor for systems
requiring active cooling. It is designed to interface directly to
an I2C bus. The ADT7470 can monitor up to 10 daisy-chained
TMP05 temperature sensors. It can also monitor and control
the speed of four fans, in automatic or in manual control loops.
A FULL_SPEED input is provided to allow the fans to be
blasted to maximum speed, via external hardware control,
under extreme thermal conditions or on system startup. An
SMBALERT interrupt communicates error conditions such as
fan under speed and over temperature measurements to the
system service processor. Individual error conditions can then
be read from status registers over the I2C bus.
FUNCTIONAL BLOCK DIAGRAM
FULL_SPEED
PWM1
PWM2
PWM3
PWM4
TACH1
TACH2
TACH3
TACH4
TMP_START
TMP_IN
ADDR
SDA SCL SMBALERT
ADDRESS
POINTER
REGISTER
PWM
CONFIG
REGISTERS
INTERRUPT
MASKING
INTERRUPT
STATUS
REGISTERS
LIMIT
COMPARATORS
VALUE AND
LIMIT
REGISTERS
SERIAL BUS
INTERFACE
SMBus
ADDRESS
SELECTION
AUTOMATIC
FAN SPEED
CONTROL
PWM
REGISTERS
AND
CONTROLLERS
FAN SPEED
COUNTERS
TEMPERATURE
DECODER
04684-
0-
001
ADT7470
Figure 1.
1 Protected by Patent Numbers US6,188,189, US6,169,442, US6,097,239, US5,982,221, US5,867,012. Other patents pending.
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