ADT7476 データシートの表示（PDF） - ON Semiconductor

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ADT7476

Remote Thermal Controller and Voltage Monitor

ON Semiconductor 

ADT7476

Table 2. THERMAL CHARACTERISTICS (Note 1)

Package Type

qJA

qJC

24-lead QSOP

122

31.25

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. Mnemonic

Description

1

SDA

Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pullup.

2

SCL

Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pullup.

3

GND

Ground Pin.

4

VCC

Power Supply. Powered by 3.3 V standby, if monitoring in low power states is required. VCC is also

monitored through this pin.

5

VID0/

Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

GPIO0

General-Purpose Open Drain Digital I/O.

6

VID1/

Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

GPIO1

General-Purpose Open Drain Digital I/O.

7

VID2/

Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

GPIO2

General-Purpose Open Drain Digital I/O.

8

VID3/

Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

GPIO3

General-Purpose Open Drain Digital I/O.

9

TACH3

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 3.

10

PWM2/

Digital Output (Open Drain). Requires 10 kW typical pullup. Pulse width modulated output to control Fan 2

SMBALERT

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.

11

TACH1

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 1.

12

TACH2

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 2.

13

PWM3

Digital I/O (Open Drain). Pulse width modulated output to control the speed of Fan 3 and Fan 4. Requires

ADDREN

10 kW 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.

14

TACH4/

Digital Input (Open Drain). Fan tachometer input to measure speed of Fan 4.

THERM/

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.

SMBALERT/

GPIO6/

ADDR SELECT

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.

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. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

GPIO4

General-Purpose Open Drain Digital I/O.

20

+5.0 VIN

Analog Input. Monitors 5.0 V power supply.

21

+12 VIN/

Analog Input. Monitors 12 V power supply.

VID5

Digital Input. Voltage supply readouts from CPU. This value is read into the VID/GPIO register (0x43).

22

+2.5 VIN/

Analog Input. Monitors 2.5 V supply, typically a chipset voltage.

THERM

Alternatively, this pin can be reconfigured as a bidirectional/omnidirectional 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.

23

VCCP

Analog Input. Monitors processor core voltage (0 V to 3.0 V).

24

PWM1/

Digital Output (Open Drain). Pulse width modulated output to control the speed of Fan 1. Requires 10 kW

typical pullup.

XTO

Also functions as the output from the XOR tree in XOR test mode.

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