ADT7462
Table 3. PIN ASSIGNMENT
Pin
POR
No.
1
Mnemonic
VID0/GPIO1/TACH1
Description
VID0: Digital Input (Open Drain). Voltage supply readouts from CPU. This value
is read in to the VID value register (0x97).
Default
TACH1
GPIO1: Open-Drain I/O. General-purpose input/output.
TACH1: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1.
2
VID1/GPIO2/TACH2
VID1: Digital Input (Open Drain). Voltage supply readouts from CPU. This value
is read in to the VID value register (0x97).
TACH2
GPIO2: Open-Drain I/O. General-purpose input/output.
TACH2: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.
3
VID2/GPIO3/TACH3
VID2: Digital Input (Open Drain). Voltage supply readouts from CPU. This value
is read in to the VID value register (0x97).
TACH3
GPIO3: Open-Drain I/O. General-purpose input/output.
TACH3: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.
4
VID3/GPIO4/TACH4
VID3: Digital Input (Open Drain). Voltage supply readouts from CPU. This value
is read in to the VID value register (0x97).
TACH4
GPIO4: Open-Drain I/O. General-purpose input/output.
TACH4: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.
5
6
7
V CC
GND
TACH5/+12V1
Power Supply. Can be powered by 3.3 V standby if monitoring in low power
states is required. The ADT7462 can also be powered from a 5.0 V supply.
Ground Pin.
TACH5: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 5.
V CC
GND
TACH5
+12V1: Analog Input. Monitors 12 V Power Supply 1. Attenuators switched on by
default.
8
TACH6/+12V2
TACH6: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 6.
TACH6
+12V2: Analog Input. Monitors 12 V Power Supply 2. Attenuators switched on by
default.
9
10
11
12
13
SCL
SDA
ADD
ALERT
PWM4/+3.3V
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus
pullup.
The state of this pin on powerup determines the SMBus device address.
Active Low Open-Drain Digital Output. Requires 10 k W typical pullup. The
ALERT pin is used to signal out-of-limit comparisons of temperature, voltage,
and fan speed. This is compatible with SMBus ALERT.
PWM4: Digital Output (Open Drain). Requires 10 k W typical pullup. Pulse-width
modulated output to control the speed of Fan 4.
SCL
SDA
ADD
ALERT
PWM4
+3.3V: Analog Input. Monitors 3.3 V power supply.
14
15
RESET
D1+/+2.5V/+1.8V
Active Low Open-Drain Digital I/O. Power-on reset, 5 mA driver (weak 100 k W
pullup), active low output (100 k W pullup) with a 180 ms typical pulse width.
RESET is asserted whenever V CC is below the reset threshold. It remains
asserted for approximately 180 ms after V CC rises above the reset threshold.
Pin 14 also functions as an active low RESET input and resets all unlocked
registers to their default values.
D1+: Anode Connection to Thermal Diode 1.
RESET
D1+
+2.5V: Monitors 2.5 V analog input.
+1.8V: Monitors 1.8 V analog input.
16
D1 ? /SCSI_TERM1
D1 ? : Cathode Connection to Thermal Diode 1.
D1 ?
SCSI_TERM1: Digital Input, SCSI Termination 1.
17
18
19
D2+
D2 ?
D3+/+1.25V/+0.9V
Anode Connection to Thermal Diode 2.
Cathode Connection to Thermal Diode 2.
D3+: Anode Connection to Thermal Diode 3.
D2+
D2 ?
D3+
+1.25V: Monitors 1.25 V analog input.
+0.9V: Monitors 0.9 V analog input.
20
D3 ? /SCSI_TERM2
D3 ? : Cathode connection to Thermal Diode 3.
D3 ?
SCSI_TERM2: Digital Input, SCSI Termination 2.
21
TACH7/+5V
TACH7: Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 7.
TACH7
+5V: Analog Input. Monitors 5.0 V power supply.
http://onsemi.com
3
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