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ADT7476
Table 2. THERMAL CHARACTERISTICS (Note 1)
24-lead QSOP
Package Type
q JA
122
q JC
31.25
Unit
° C/W
1. q JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages.
Table 3. PIN ASSIGNMENT
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
Mnemonic
SDA
SCL
GND
V CC
VID0/
GPIO0
VID1/
GPIO1
VID2/
GPIO2
VID3/
GPIO3
TACH3
PWM2/
SMBALERT
TACH1
TACH2
PWM3
ADDREN
TACH4 /
THERM/
SMBALERT/
GPIO6/
ADDR SELECT
D2–
D2+
D1–
D1+
VID4/
GPIO4
+5.0 V IN
+12 V IN /
VID5
+ 2.5  V IN /
THERM
V CCP
PWM1/
XTO
Description
Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pullup.
Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.
Ground Pin.
Power Supply. Powered by 3.3 V standby, if monitoring in low power states is required. V CC is also
monitored through this pin.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.
Digital Output (Open Drain). Requires 10 k W typical pullup. Pulse width modulated output to control Fan 2
speed. Can be configured as a high or low frequency drive. Digital Output (Open Drain). This pin can 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.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.
Digital I/O (Open Drain). Pulse width modulated output to control the speed of Fan 3 and Fan 4. Requires
10 k W typical pullup. Can be configured as a high or low frequency drive.
If pulled low on powerup, the ADT7476 enters address select mode, and the state of Pin 14 (ADDR SELECT)
determines the ADT7476’s slave address.
Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.
Alternatively, the pin can be reconfigured as a bidirectional THERM pin. Times and monitors assertions on
the THERM input. For example, it 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.
Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal
out-of-limit conditions.
General-Purpose Open Drain Digital I/O.
If in address select mode, the logic state of this pin defines 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. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
General-Purpose Open Drain Digital I/O.
Analog Input. Monitors 5.0 V power supply.
Analog Input. Monitors 12 V power supply.
Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).
Analog Input. Monitors 2.5 V supply, typically a chipset voltage.
Alternatively, this pin can be reconfigured as a bidirectional/omnidirectional THERM pin. C an be use d 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.
Analog Input. Monitors processor core voltage (0 V to 3.0 V).
Digital Output (Open Drain). Pulse width modulated output to control the speed of Fan 1. Requires 10 k W
typical pullup.
Also functions as the output from the XOR tree in XOR test mode.
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