ADT7476AARQZ-REEL 查看數據表（PDF） - Analog Devices

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ADT7476AARQZ-REEL

dBCool™ Remote Thermal Controller and Voltage Monitor

Analog Devices 

ADT7476A

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

SDA 1

24 PWM1/XTO

SCL 2

GND 3

VCC 4

VID0/GPIO0 5

VID1/GPIO1 6

VID2/GPIO2 7

23 VCCP

22 +2.5VIN/THERM

21 +12VIN/VID5

ADT7476A

TOP VIEW

(Not to Scale)

20 +5VIN

19 VID4/GPIO4

18 D1+

VID3/GPIO3 8

17 D1–

TACH3 9

16 D2+

PWM2/SMBALERT 10

15 D2–

TACH1 11

14 TACH4/THERM/SMBALERT/GPIO6/ADDR SELECT

TACH2 12

13 PWM3/ADDREN

Figure 3. Pin Configuration

Table 4. Pin Function Descriptions

Pin No. Mnemonic Description

1

SDA

Digital I/O (Open Drain). SMBus bidirectional serial data. Requires SMBus pull-up.

2

SCL

Digital Input (Open Drain). SMBus serial clock input. Requires SMBus pull-up.

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 kΩ typical pull-up. Pulse width modulated output to control Fan 2

speed. Can be configured as a high or low frequency drive.

SMBALERT

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 10 kΩ

typical pull-up. Can be configured as a high or low frequency drive.

ADDREN

If pulled low on power-up, the ADT7476A enters address select mode, and the state of Pin 14 (ADDR SELECT)

determines the ADT7476A’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/

Digital Output (Open Drain). This pin can be reconfigured as an SMBALERT interrupt output to signal out-of-

limit conditions.

GPIO6/

General-Purpose Open Drain Digital I/O.

ADDR SELECT 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.

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