ADT7473 datasheet(8/73 Pages) ONSEMI

Part #	ADT7473

Description	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 5 illustrates the differences between the ADT7473

and the ADT7473−1.

Table 5. 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 6. PIN 9 SETTINGS

Bit 0

Bit 1

Function

0

TACH4

0

1

THERM

1

0

GPIO

1

SMBALERT

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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