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ADT7476
Product Description
The ADT7476 is a complete thermal monitor and multiple
fan controller for any system requiring thermal monitoring
and cooling. The device communicates with the system via
a serial system management bus. The serial bus controller
has a serial data line for reading and writing addresses and
data (Pin 1), and an input line for the serial clock (Pin 2). All
control and programming functions for the ADT7476 are
performed over the serial bus. In addition, a pin can be
reconfigured as an SMBALERT output to signal
out-of-limit conditions.
Feature Comparisons Between ADT7476 and ADT7468
? Dynamic T MIN , dynamic operating point, and
associated registers are no longer available in the
ADT7476. The following related registers are gone:
? Calibration Control 1 (0x36)
? Calibration Control 2 (0x37)
? Operating Point (0x33, 0x34, and 0x35)
? Previously (in the ADT7468), T RANGE defined the slope
of the automatic fan control algorithm. T RANGE now
defines a true temperature range (in the ADT7476).
? Acoustic filtering is now assigned to temperature zones,
not to fans. Available smoothing times have been
increased for better acoustic performance.
? Temperature measurements are now made with two
switching currents instead of three. SRC is not available
in the ADT7476.
? High frequency PWM can now be enabled/disabled on
each PWM output individually.
? THERM can now be enabled/disabled on each
temperature channel individually.
? The ADT7476 does not support full shutdown mode.
? The ADT7476 offers increased temperature accuracy
on all temperature channels.
? The ADT7476 defaults to twos complement
temperature measurement mode.
? Some pins have swapped/added functions.
? The powerup routine for the ADT7476 is simplified.
? The ADT7476 has a higher maximum input voltage
TACH/PWM spec, supporting a wider range of fans.
? V CORE_LOW_ENABLE has been reallocated to Bit 7 of
Configuration Register 1 (0x40).
Recommended Implementation
Configuring the ADT7476 as shown in Figure 13 allows
the system designer to use the following features:
? Two PWM outputs for fan control of up to three fans
(the front and rear chassis fans are connected in
parallel).
? Three TACH fan speed measurement inputs.
? V CC measured internally through Pin 4.
? CPU temperature measured using Remote 1
temperature channel.
? Remote temperature zone measured through Remote 2
temperature channel.
? Local temperature zone measured through the internal
temperature channel.
? Bidirectional THERM pin. This feature allows
Intel ? Pentium ? 4 PROCHOT monitoring and can
function as an overtemperature THERM output. It can
alternatively be programmed as an SMBALERT system
interrupt output.
FRONT
CHASSIS
FAN
TACH2
ADT7476
PWM1
TACH1
REAR
CHASSIS
FAN
PWM3
TACH3
VID[0:4]/VID[0:5]
D2+
5(VRM9)/6(VRM10)
D2 ?
AMBIENT
TEMPERATURE
D1+
D1 ?
V CC
+5V IN
THERM
SDA
SCL
PROCHOT
+12V IN /VID5 SMBALERT
GND
Figure 13. ADT7476 Configuration
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