Temperature Sensor Hub and Fan Controller
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)
Networking and telecommunications equipment
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
SDA SCL SMBALERT
1 Protected by Patent Numbers US6,169,442, US6,097,239, US5,982,221, US5,867,012. Other patents pending.
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