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ADM1027 bảng dữ liệu(PDF) 5 Page - Analog Devices

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REV. A
ADM1027
–5–
PIN FUNCTION DESCRIPTIONS
Pin
Mnemonic
Description
1
SDA
Digital I/O (Open-Drain). SMBus bidirectional serial data. Requires SMBus pull-up.
2
SCL
Digital Input (Open-Drain). SMBus serial clock input. Requires SMBus pull-up.
3GND
Ground Pin for the ADM1027.
4VCC
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 ADM1027 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.
5
VID0
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/
SMBALERT
Digital Output (Open-Drain). Requires 10 k
W typical pull-up. Pulsewidth modulated output
to control Fan 2 speed. This pin may 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/
ADDRESS ENABLE
Digital I/O (Open-Drain). Pulsewidth modulated output to control Fan 3 speed. Requires
10 k
W typical pull-up. If pulled low on power-up, this places the ADM1027 into address
select mode, and the state of Pin 14 will determine the ADM1027’s slave address.
14
TACH4/ADDRESS SELECT
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.
15
D2–
Cathode Connection to Second Thermal Diode.
16
D2+
Anode Connection to Second Thermal Diode.
17
D1–
Cathode Connection to First Thermal Diode.
18
D1+
Anode Connection to First Thermal Diode.
19
VID4
Digital Input (Open-Drain). Voltage supply readouts from CPU. This value is read into the
VID register (Reg. 0x43).
20
5VIN
Analog Input. Monitors 5 V power supply.
21
12VIN
Analog Input. Monitors 12 V power supply.
22
2.5VIN
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
23
VCCP
Analog Input. Monitors processor core voltage (0 V to 3 V).
24
PWM1/XTO
Digital Output (Open-Drain). Pulsewidth modulated output to control Fan 1 speed. Requires
10 k
W typical pull-up. Also functions as the output from the XOR tree in XOR test mode.


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