ADT7473ARQZ-REEL datasheet(8/74 Pages) ONSEMI

Part #	ADT7473ARQZ-REEL

Description	dBCOOL Remote Thermal Monitor and Fan Control

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ADT7473

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Product Description

The ADT7473/ADT7473−1 is a complete thermal

monitor and multiple fan controller for any system requiring

thermal monitoring and cooling. The device communicates

with the system via a serial system management bus. The

serial bus controller has a serial data line for reading and

writing addresses and data (Pin 16), and an input line for the

serial clock (Pin 1). All control and programming functions

for the ADT7473/ADT7473−1 are performed over the serial

bus. Additionally, a pin can be reconfigured as an

SMBALERT output to signal out−of−limit conditions.

Table 1 illustrates the differences between the ADT7473

and the ADT7473−1.

Table 1. ADT7473/ADT7473−1 Device Comparison

Feature

ADT7473

ADT7473−1

Pin 5

Default:

PWM2

Default:

THERM_LATCH

SMBus Address

Fixed

Address

Address selectable

Remote Ch. 2

Therm Limit

= 100°C

= 136°C

Register 0x30,

0x31, 0x32

Default:

0x00

Default: 0xFF

Register 0x3F

Revision Reg

Default:

0x68

Default: 0x69

Register 0x40, Bit 7

Reserved

(R/W) 1 = Reset Latch

(lockable)

Register 0x42, Bit 0

Reserved

(Read−only)

1 = THERM

Limit Latched

Registers 0x5C,

0x5D, 0x5E

Default:

0x82

Default: 0x62

Register 0x7C, Bit 4

Reserved

THERM Output

Hysteresis

Register 0x7D, Bit 4

Reserved

THERM_LATCH

Configuration

0 = Remote Channel 2

1 = Remote Channel 1

and Remote Channel 2

Comparison Between ADT7467 and

ADT7473/ADT7473−1

The following list shows some comparisons between the

ADT7467 and the ADT7473/ADT7473−1:

• The ADT7473/ADT7473−1 can be powered via a

3.3 V supply only, and does not support 5.0 V

operation, while the ADT7467 does. Violating this

specification results in irreversible damage to the

ADT7473/ADT7473−1. See the Specifications section

for more information.

• A high frequency PWM drive can be independently

selected for each PWM channel on the

ADT7473/ADT7473−1. This is not available on the

ADT7467.

• The range and resolution of the temperature offset

register can be changed from a

±64°C range at 0.5°C

resolution to a

±128°C range at 1°C resolution. This is

not available on the ADT7467.

• THERM overtemperature events can be

disabled/enabled individually on each temperature

channel. This is not available on the ADT7467.

• Bit 7 of Configuration Register 1 is no longer supported

because the ADT7473/ADT7473−1 cannot be powered

via a 5.0 V supply.

• Bit 0 of Configuration Register 1 (0x40) remains

writable after the lock bit is set. This bit enables

monitoring.

• 2−wire fan speed measurement is not supported on the

ADT7473/ADT7473−1.

How to Set the Functionality of Pin 9

Pin 9 on the ADT7473/ADT7473−1 has four possible

functions: SMBALERT, THERM, GPIO, and TACH4. The

user chooses the required functionality by setting Bit 0 and

Bit 1 of Configuration Register 4 (0x7D).

Table 2. Pin 9 Settings

Bit 0

Bit 1

Function

0

TACH4

0

1

THERM

1

0

SMBALERT

1

GPIO

Recommended Implementation

Configuring the ADT7473 as shown in Figure 12 allows

the system designer to use the following features:

• Two PWM outputs for fan control of up to three fans.

(The front and rear chassis fans are connected in

parallel.)

• Three TACH fan speed measurement inputs.

• VCC measured internally through Pin 3.

• CPU temperature measured using Remote 1

temperature channel.

• Ambient temperature measured through Remote 2

temperature channel.

• Bidirectional THERM pin. This feature allows Intel

Pentium 4 PROCHOT monitoring and can function as

an overtemperature THERM output. It can alternatively

be programmed as an SMBALERT system interrupt

output.

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Analog Devices	ADT7473ARQZ-REEL	1Mb / 76P	dBCool Remote Thermal Monitor and Fan Controller REV. A
ON Semiconductor	ADT7473ARQZ-REEL	627Kb / 73P	Remote Thermal Monitor and Fan Control April, 2015 ??Rev. 10
ON Semiconductor	ADT7473ARQZ-REEL	624Kb / 73P	Remote Thermal Monitor and Fan Control November, 2016 ??Rev. 11
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Manufacturer	Part #	Datasheet	Description
ON Semiconductor	ADT7473	1Mb / 74P	dbCOOL Remote Thermal Monitor and Fan Control October, 2011 ??Rev. 7
Analog Devices	ADT7467	1Mb / 80P	dBCool Remote Thermal Monitor and Fan Controller REV. 0
ON Semiconductor	ADT7475_1110	639Kb / 58P	dbCOOL Remote Thermal Monitor and Fan Controller October, 2011 ??Rev. 5
Analog Devices	ADT7473	1Mb / 76P	dBCool Remote Thermal Monitor and Fan Controller REV. A
ON Semiconductor	ADT7460	645Kb / 46P	dBCOOL Remote Thermal Monitor and Fan Controller June, 2010 ??Rev. 5
	ADT7475	654Kb / 58P	dBCOOL Remote Thermal Monitor and Fan Controller June, 2009 ??Rev. 4
	ADT7467	938Kb / 77P	dBCool Remote Thermal Monitor and Fan Controller January 2008 ??Rev. 3
Analog Devices	ADT7475	1Mb / 68P	dBCool Remote Thermal Monitor and Fan Controller REV. A
ON Semiconductor	ADT7473	624Kb / 73P	Remote Thermal Monitor and Fan Control November, 2016 ??Rev. 11
ON Semiconductor	ADT7473	627Kb / 73P	Remote Thermal Monitor and Fan Control April, 2015 ??Rev. 10

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ADT7473ARQZ-REEL Datasheet(PDF) 8 Page - ON Semiconductor

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