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ADT7468
Bit 1= 0 is the high frequency (22.5 kHz) fan drive signal.
Bit 1 = 1 switches the fan drive to low frequency PWM,
programmable between 10 Hz and 100 Hz, the same as the
RECOMMENDED IMPLEMENTATION
Configuring the ADT7468 as in Figure 15 allows the system
designer to use the following features:
ADT7463. The default = 0 = HF PWM.
Bit 2 sets the direction for the GPIO: 0 = input, 1 = output.
Bit 3 sets the GPIO polarity: 0 = active low, 1 = active high.
Setting the Functionality of Pin 14
Pin 14 on th e ADT7468 has four possible functions:
SMBALERT, THERM, GPIO, and TACH4. The user chooses
the required functionality by setting Bit 0 and Bit 1 of
Configuration Register 4 at Address 0x7D.
Table 4. Pin 14 Settings
?
?
?
?
?
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 3.
CPU temperature measured using Remote 1 temperature
channel.
Ambient temperature measured through Remote 2
temperature channel.
Bit 0
0
0
1
1
Bit 1
0
1
0
1
Function
TACH4
THERM
SMBALERT
GPIO
?
Bidirectional THERM pin. This feature allows Intel
Pentium 4 PROCHOT monitoring and can function as an
overtemperature THERM output. Alternatively, it can be
programmed as an SMBALERT system interrupt output.
CPU FAN
FRONT
ADT7468
CHASSIS
FAN
REAR
CHASSIS
FAN
TACH2
PWM3
TACH3
PWM1
TACH1
VID[0:4]/VID[0:5]
D2+
D2–
THERM
5(VRM9)/6(VRM10)
AMBIENT
D1+
PROCHOT
CPU
TEMPERATURE
D1–
3.3VSB
5V
12V/VID5
SDA
ADP316x
VRM
V COMP
CURRENT
SCL
SMBALERT
CONTROLLER
V CORE
GND
ICH
Figure 15. ADT7468 Configuration
Rev. 3 | Page 11 of 81 | www.onsemi.com
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