ADT7460(2013) データシートの表示（PDF） - ON Semiconductor
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ADT7460 Datasheet PDF : 47 Pages
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ADT7460
Table 2. THERMAL CHARACTERISTICS
Package Type
qJA
qJC
16-lead QSOP
150
39
1. qJA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.
Unit
°C/W
Table 3. PIN ASSIGNMENT
Pin No.
1
Mnemonic
SCL
Description
Digital Input (Open-Drain). SMBus serial clock input. Requires SMBus pullup.
2
GND
Ground Pin for the ADT7460.
3
VCC
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 ADT7460 can also be powered from a 5.0 V
supply. Setting Bit 7 of Configuration Register 1 (Reg. 0x40) rescales the VCC input attenuators
to correctly measure a 5.0 V supply.
4
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.
5
PWM2
Digital Output (Open-Drain). Requires 10 kW typical pullup. Pulse-width modulated output to
control Fan 2 speed.
SMBALERT
Digital Output (Open-Drain). This pin may be reconfigured as an SMBALERT interrupt output
to signal out-of-limit conditions.
6
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.
7
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.
8
PWM3
Digital I/O (Open-Drain). Pulse-width modulated output to control Fan 3/4 speed. Requires
10 kW typical pullup.
ADDRESS ENABLE
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.
9
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.
ADDRESS SELECT If in address select mode, this pin determines the SMBus device address.
THERM
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.
10
D2−
Cathode Connection to Second Thermal Diode.
11
D2+
Anode Connection to Second Thermal Diode.
12
D1−
Cathode Connection to First Thermal Diode.
13
D1+
Anode Connection to First Thermal Diode.
14
+2.5 VIN
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
SMBALERT
Digital Output (Open-Drain). This pin may be reconfigured as an SMBALERT interrupt output
to signal out-of-limit conditions.
15
PWM1/XTO
Digital Output (Open-Drain). Pulse-width modulated output to control Fan 1 speed. Requires
10 kW typical pullup.
16
SDA
Digital I/O (Open-Drain). SMBus bidirectional serial data. Requires SMBus pullup.
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