ADT7468 查看數據表（PDF） - ON Semiconductor
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ADT7468 Datasheet PDF : 81 Pages
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ADT7468
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
SDA 1
24 PWM1/XTO
SCL 2
GND 3
23 VCCP
22 +2.5VIN
VCC 4
21 +12VIN/VID5
VID0 5
20 +5VIN/THERM
VID1 6 ADT7468 19 VID4
TOP VIEW
VID2 7 (NOT TO SCALE) 18 D1+
VID3 8
17 D1–
TACH3 9
16 D2+
PWM2/SMBALERT 10
15 D2–
TACH1 11
14 TACH4/GPIO/THERM/SMBALERT
TACH2 12
13 PWM3
Figure 3. Pin Configuration
Table 3. Pin Function Descriptions
Pin
No. Mnemonic Description
1
SDA
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires pull-up resistor.
2
SCL
Digital Input (Open Drain). SMBus serial clock input. Requires pull-up resistor.
3
GND
Ground Pin.
4
VCC
5
VID0
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 ADT7468 can also be powered from a 5 V supply. Setting Bit 7 of Configuration 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).
6
VID1
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
7
VID2
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
8
VID3
Digital Input (Open Drain). Voltage supply readouts from CPU. This value is read into the VID register (Reg. 0x43).
9
TACH3
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.
10 PWM2
Digital Output (Open Drain). Requires 10 kΩ typical pull-up. Pulse width modulated output to control Fan 2 speed.
Can be configured as a high or low frequency drive.
SMBALERT Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of-limit
conditions.
11 TACH1
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.
12 TACH2
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.
13 PWM3
Digital I/O (Open Drain). Pulse width modulated output to control speed of Fan 3 and Fan 4. Requires 10 kΩ typical
pull-up. Can be configured as a high or low frequency drive.
14 TACH4
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.
GPIO
General Purpose Open Drain Digital I/O.
THERM
Alternatively, the pin can be reconfigured as a bidirectional THERM pin. Can be used to time and monitor assertions
on the THERM input. For example, this pin can be connected to the PROCHOT output of an Intel Pentium 4 processor
or to the output of a trip point temperature sensor. This pin can also be used as an output to signal overtemperature
conditions.
SMBALERT Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of-limit
conditions.
15 D2–
Cathode Connection to Second Thermal Diode.
Rev. 3 | Page 6 of 81 | www.onsemi.com
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