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ADT7462
Table 3. PIN ASSIGNMENT
Pin
POR
No.
22
Mnemonic
TACH8/+12V3
Description
TACH8: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 8.
Default
TACH8
+12V3: Analog Input. Monitors 12 V Power Supply 3.
23
V CCP1 /+1.5V/+1.8V/+2.5V
V CCP1 : Monitors 1.2 V analog input.
+1.8V
+1.5V: Monitors 1.5 V analog input.
+1.8V: Monitors 1.8 V analog input.
+2.5V: Monitors 2.5 V analog input.
24
V CCP2 /+1.5V/+1.8V/+2.5V
V CCP2 : Monitors 1.2 V analog input.
+2.5V
+1.5V: Monitors 1.5 V analog input.
+1.8V: Monitors 1.8 V analog input.
+2.5V: Monitors 2.5 V analog input.
25
VR_HOT1/+1.2V1/+3.3V
VR_HOT1: Digital Input Indicating Overtemperature Event on Voltage Regulator.
+3.3V
+1.2V1: 0 V to 1.2 V Analog Input. For example, can be used to monitor G BIT .
+3.3V: Analog Input. Monitors 3.3 V power supply.
26
VR_HOT2/+1.2V2/V BATT
VR_HOT2: Digital Input Indicating Overtemperature Event on Voltage Regulator.
V BATT
+1.2V2: 0 V to 1.2 V Analog Input. For example, can be used to monitor FSB_V TT .
V BATT : Analog Input. Monitors battery voltage, nominally 3.0 V.
27
FAN2MAX/CI
FAN2MAX: Sets fan to maximum speed when a fan fault condition occurs.
Bidirectional open drain, active low I/O.
CI
CI: An active high input that captures a chassis intrusion event in Bit 7 of the
digital status register. This bit remains set until cleared, as long as battery
voltage is applied to the V BATT input, even when the ADT7462 is powered off.
28
THERM1/+1.5V1/GPIO7/VID6
THERM1: Can be reconfigured as a bidirectional THERM pin. Can be connected
to the PROCHOT output of the Intel ? Pentium ? 4 processor to time and monitor
PROCHOT assertions. Can be used as an output to signal overtemperature
conditions or for clock modulation purposes.
THERM1
+1.5V1: 0 V to 1.5 V Analog Input. Can be used to monitor ICH.
GPIO7: Open-Drain I/O. General-purpose input/output.
VID6: Digital Input (Open Drain). Voltage supply readouts from CPU. This value
is read in to the VID value register (0x97).
29
THERM2/+1.5V2/GPIO8
THERM2: Can be reconfigured as a bidirectional THERM pin. Can be connected
to the PROCHOT output of the Intel ? Pentium ? 4 processor to time and monitor
PROCHOT assertions. Can be used as an output to signal overtemperature
conditions or for clock modulation purposes.
THERM2
+1.5V2: 0 V to 1.5 V Analog Input. Can be used to monitor 3GIO.
GPIO8: Open-Drain I/O. General-purpose input/output.
30
31
PWM3
VID4/GPIO5/PWM1
Digital Output (Open Drain). Requires 10 k W typical pullup. Pulse-width
modulated output to control the speed of Fan 3.
VID4: Digital Input (Open Drain). Voltage supply readouts from CPU. This value
is read in to the VID value register (0x97).
PWM3
PWM1
GPIO5: Open-Drain I/O. General-purpose input/output.
PWM1: Digital Output (Open Drain). Requires 10 k W typical pullup. Pulse-width
modulated output to control the speed of Fan 1.
32
VID5/GPIO6/PWM2
VID5: Digital Input (Open Drain). Voltage supply readouts from CPU. This value
is read in to the VID value register (0x97).
PWM2
GPIO6: Open-Drain I/O. General-purpose input/output.
PWM2: Digital Output (Open Drain). Requires 10 k W typical pullup. Pulse-width
modulated output to control the speed of Fan 2.
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