ADT7466ARQZ datasheet(7/48 Pages) AD

No. de pieza	ADT7466ARQZ

Descripción Electrónicos	dBCool Remote Thermal Controller and Voltage Monitor

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Fabricante Electrónico	AD [Analog Devices]

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ADT7466

Rev. 0 | Page 7 of 48

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADT7466

TOP VIEW

(Not to Scale)

DRIVE1

1

SCL

16

TACH1

2

SDA

15

DRIVE2

3

ALERT

14

TACH2

4

REFOUT

13

GND

5

AIN2/TH2/D2+

12

VCC 6

AIN1/TH1/D2–

11

FAN1_ON/PROCHOT/THERM

7

D1+

10

FANLOCK

8

D1–

9

Figure 3. Pin Configuration

Table 3. Pin Function Descriptions

Pin No.

Mnemonic

Type

Description

1

DRIVE1

Analog

Output

Output of 8-Bit DAC Controlling Fan 1 Speed.

2

TACH1

Digital

Input

Fan Tachometer Input to Measure Speed of Fan 1.

3

DRIVE2

Analog

Output

Output of 8-Bit DAC Controlling Fan 2 Speed.

4

TACH2

Digital

Input

Fan Tachometer Input to Measure Speed of Fan 2.

5

GND

Ground

Ground Pin for Analog and Digital Circuitry.

6

VCC

Power

supply

3.3 V Power Supply. VCC is also monitored through this pin.

7

FAN1_ON/ PROCHOT/

THERM

Digital I/O

If configured as FAN1_ON, this pin is the open-drain control signal output for the dc-dc

converter. Active (high) when DRIVE1 > V_FAN_MIN.

If configured as PROCHOT, the input can be connected to the PROCHOT output of the

Intel Pentium 4 processor to time and monitor PROCHOT assertions.

If configured as THERM, this pin is the interrupt output to flag critical thermal events.

8

FANLOCK

Digital

Output

Open-Drain Digital Output. This output is asserted (low) when either of the fans stall or

fail to spin up.

9

D1−

Analog

Input

Cathode Connection to Thermal Diode 1.

10

D1+

Analog

Input

Anode Connection to Thermal Diode 1.

11

AIN1/TH1/D2−

Analog

input

0 V to 2.25 V Analog Input. Can be reconfigured as thermistor input or as a cathode

connection to Thermal Diode 2. Configured for thermistor connection by default.

12

AIN2(TH2)/D2+

Analog

Input

0 V to 2.25 V Analog Input. Can be reconfigured as thermistor input or as an anode

connection to Thermal Diode 2. Configured for thermistor connection by default.

13

REFOUT

Analog

Output

2.25 V Reference Voltage Output, 20 mA maximum output current.

14

ALERT

Digital

Output

Open-Drain Digital Output. The SMBus ALERT pin alerts the system to out-of-limit events

such as a failed fan, overtemperature, or out-of-limit analog measurement.

15

SDA

Digital I/O

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

16

SCL

Digital

Input

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

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