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ADT7467
Recommended Implementation
Configuring the ADT7467 as shown in Figure 53 provides
the system designer with the following features:
? Two PWM outputs for 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 3.
? CPU core voltage measurement (V CORE ).
? CPU temperature measured using the Remote 1
temperature channel.
? Ambient temperature measured through the Remote 2
temperature channel.
? The bidirectional THERM pin allows monitoring
PROCHOT output from, for example, an Intel ?
Pentium ? 4 processor, or it can be used as an
overtemperature THERM output.
? SMBALERT system interrupt output.
STEP 2: Configuring the MUX
After the system hardware configuration is determined,
the fans can be assigned to particular temperature channels.
Not only can fans be assigned to individual channels, but the
behavior of the fans is also configurable. For example, fans
can run using automatic fan control, can run manually (using
software control), or can run at the fastest speed calculated
by multiple temperature channels. The mux is the bridge
between temperature measurement channels and the three
PWM outputs.
Bits <7:5> (BHVR) of Register 0x5C, Register 0x5D, and
Register 0x5E (PWM configuration registers) control the
MUX
behavior of the fans connected to the PWM1, PWM2, and
PWM3 outputs. The values selected for these bits determine
how the mux connects a temperature measurement channel
to a PWM output.
Automatic Fan Control Mux Options
<7:5> (BHVR), Register 0x5C, Register 0x5D, and
Register 0x5E
000 = Remote 1 temperature controls PWMx
001 = Local temperature controls PWMx
010 = Remote 2 temperature controls PWMx
101 = Fastest Speed calculated by Local and Remote 2
temperature controls PWMx
110 = Fastest Speed Calculated by All Three Temperature
Channels Controls PWMx
The fastest speed calculated option pertains to controlling
one PWM output based on multiple temperature channels.
The thermal characteristics of the three temperature zones
can be set to drive a single fan. An example would be the fan
turning on when the Remote 1 temperature exceeds 60 ? C or
when the local temperature exceeds 45 ? C.
Other Mux Options
<7:5> (BHVR), Register 0x5C, Register 0x5D, and Register
0x5E
011 = PWMx Runs at Full speed
100 = PWMx disabled (default)
111 = manual mode. PWMx is run using software control.
In this mode, PWM duty cycle registers (Register 0x30 to
Register 0x32) are writable and control the PWM outputs.
Thermal Calibration
100%
PWM
MIN
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
PWM1
T MIN
100%
1
23 REMOTE 1 =
AMBIENT TEMP
0%
T RANGE
Thermal Calibration
PWM
MIN
Tachometer 1
Measurement
PWM
CONFIG
TACH1
CPU FAN SINK
MUX
Ramp Control
(Acoustic
Enhancement)
PWM
Generator
PWM2
T MIN
100%
LOCAL =
VRM TEMP
0%
T RANGE
Thermal Calibration
PWM
MIN
Tachometer 2
Measurement
Ramp Control
(Acoustic
Enhancement)
PWM
CONFIG
PWM
Generator
TACH2
PWM3
FRONT CHASSIS
T RANGE
REMOTE 2 =
CPU TEMP
T MIN
Tachometer 3
0% and 4
Measurement
Figure 54. Assigning Temperature Channels to Fan Channels
TACH3
REAR CHASSIS
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