ADT7460ARQZ-RL7 ONSEMI [ON Semiconductor], ADT7460ARQZ-RL7 Datasheet - Page 3

• Manufacturer Part Number: ADT7460ARQZ-RL7
• Description: dBCOOL Remote Thermal Monitor and Fan Controller
• Manufacturer: ONSEMI [ON Semiconductor]

PIN ASSIGNMENT
Pin No.
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
ADDRESS ENABLE
ADDRESS SELECT
SMBALERT
SMBALERT
PWM1/XTO
Mnemonic
+2.5 V
THERM
TACH3
TACH1
TACH2
TACH4
PWM2
PWM3
GND
SDA
SCL
V
D2−
D2+
D1−
D1+
CC
IN
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.
Ground Pin for the ADT7460.
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 5.0 V supply.
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 pullup. 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 3/4 speed. Requires
10 kW typical pullup.
If pulled low on powerup, this places the ADT7460 into address select mode, and the state of
Pin 9 determines the ADT7460’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.
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.
Digital Output (Open Drain). Pulse−width modulated output to control Fan 1 speed. Requires
10 kW typical pullup.
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pullup.
CC
is also monitored through this pin. The ADT7460 can also be powered from a 5.0 V supply.
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ADT7460
3
Description
CC
input attenuators to