adm1027 Analog Devices, Inc., adm1027 Datasheet - Page 5

• Manufacturer Part Number: adm1027
• Description: Dbcool? Remote Thermal Controller And Voltage Monitor
• Manufacturer: Analog Devices, Inc.

Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
REV. A
Mnemonic
SDA
SCL
GND
V
VID0
VID1
VID2
VID3
TACH3
PWM2/SMBALERT
TACH1
TACH2
PWM3/ADDRESS ENABLE
TACH4/ADDRESS SELECT
D2–
D2+
D1–
D1+
VID4
5V
12V
2.5V
V
PWM1/XTO
CC
CCP
IN
IN
IN
Description
Digital I/O (Open-Drain). SMBus bidirectional serial data. Requires SMBus pull-up.
Digital Input (Open-Drain). SMBus serial clock input. Requires SMBus pull-up.
Ground Pin for the ADM1027.
Power Supply. Can be powered by 3.3 V standby if monitoring in low power states is required.
V
Setting Bit 7 of Configuration Register 1 (Reg. 0x40) rescales the V
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 kW 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.
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). Pulsewidth modulated output to control Fan 3 speed. Requires
10 kW 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.
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.
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.
Analog Input. Monitors 12 V power supply.
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
Analog Input. Monitors processor core voltage (0 V to 3 V).
Digital Output (Open-Drain). Pulsewidth modulated output to control Fan 1 speed. Requires
10 kW typical pull-up. Also functions as the output from the XOR tree in XOR test mode.
CC
is also monitored through this pin. The ADM1027 can also be powered from a 5 V supply.
PIN FUNCTION DESCRIPTIONS
–5–
CC
input attenuators to
ADM1027