ADT7463 データシートの表示（PDF） - ON Semiconductor
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ADT7463 Datasheet PDF : 52 Pages
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ADT7463
PIN FUNCTION DESCRIPTIONS
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Mnemonic
SDA
SCL
GND
VCC
VID0
VID1
VID2
VID3
TACH3
PWM2
SMBALERT
TACH1
TACH2
PWM3
ADDRESS ENABLE
TACH4
ADDRESS
SELECT
THERM
D2–
D2+
D1–
D1+
VID4
+5VIN
THERM
+12VIN
VID5
+2.5VIN
SMBALERT
VCCP
PWM1/
XTO
Description
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus.
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.
Ground Pin for the ADT7463.
Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required. VCC is also
monitored through this pin. The ADT7463 can also be powered from a 5 V supply. Setting Bit 7 of Configura-
tion Register 1 (Reg. 0x40) rescales the VCC input attenuators to correctly measure a 5 V supply.
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3. Can be reconfigured as an analog
input (AIN3) to measure the speed of 2-wire fans.
Digital Output (Open Drain). Requires 10 kΩ typical pull-up. Pulse-width modulated output to control FAN 2
speed.
Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal
out-of-limit conditions.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1. Can be reconfigured as an analog
input (AIN1) to measure the speed of 2-wire fans.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2. Can be reconfigured as an analog
input (AIN2) to measure the speed of 2-wire fans.
Digital I/O (Open Drain). Pulse-width modulated output to control Fan 3/Fan 4 speed. Requires 10 kΩ typical
pull-up.
If pulled low on power-up, this places the ADT7463 into address select mode, and the state of Pin 14 will determine
the ADT7463’s slave address.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4. Can be reconfigured as an analog
input (AIN4) to measure the speed of 2-wire fans.
If in address select mode, this pin determines the SMBus device address.
Alternatively, the pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monitor
assertions on the THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4
processor or to the output of a trip point temperature sensor. Can be used as an output to signal
overtemperature conditions.
Cathode Connection to Second Thermal Diode.
Anode Connection to Second Thermal Diode.
Cathode Connection to First Thermal Diode.
Anode Connection to First Thermal Diode.
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Analog Input. Monitors 5 V power supply.
Alternatively, this pin may be reconfigured as a bidirectional THERM pin. Can be used to time and monitor
assertions on the THERM input. For example, can be connected to the PROCHOT output of Intel’s Pentium 4
processor or to the output of a trip point temperature sensor. Can be used as an output to signal
overtemperature conditions.
Analog Input. Monitors 12 V power supply.
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
Supports VRM10 solutions.
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
Digital Output (Open Drain). This pin may be reconfigured as an SMBALERT interrupt output to signal
out-of-limit conditions.
Analog Input. Monitors processor core voltage (0 V to 3 V).
Digital Output (Open Drain). Pulse-width modulated output to control Fan 1 speed. Requires 10 kΩ typical pull-up.
Also functions as the output from the XOR tree in XOR test mode.
REV. C
Rev. 4 | Page 5 of 52 | www.onsemi.com
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