ADT7463ARQZ-REEL datasheet(6/52 Pages) ONSEMI

Part #	ADT7463ARQZ-REEL

Description	dB COOL??Remote Thermal Controller and Voltage Monitor

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Manufacturer	ONSEMI [ON Semiconductor]

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REV. C

–6–

ADT7463

FUNCTIONAL DESCRIPTION

General Description

The ADT7463 is a complete systems monitor and multiple fan

controller for any system requiring monitoring and cooling. The

device communicates with the system via a serial system

management bus. The serial bus controller has an optional

address line for device selection (Pin 14), a serial data line

for reading and writing addresses and data (Pin 1), and an input

line for the serial clock (Pin 2). All control and programming

functions of the ADT7463 are performed over the serial bus. In

addition, two of the pins can be reconfigured as an SMBALERT

output to indicate out-of-limit conditions.

Measurement Inputs

The device has six measurement inputs, four for voltage and

two for temperature. It can also measure its own supply voltage

and can measure ambient temperature with its on-chip tempera-

ture sensor.

Pins 20 through 23 are analog inputs with on-chip attenuators,

configured to monitor 5 V, 12 V, 2.5 V, and the processor core

voltage (2.25 V input), respectively.

Power is supplied to the chip via Pin 4, and the system also

monitors VCC through this pin. In PCs, this pin is normally

connected to a 3.3 V standby supply. This pin can, however, be

connected to a 5 V supply and monitor it without overranging.

Remote temperature sensing is provided by the D1� and D2�

inputs, to which diode-connected, external temperature-sensing

transistors, such as a 2N3904 or CPU thermal diode, may be

connected.

The ADC also accepts input from an on-chip band gap tem-

perature sensor that monitors system ambient temperature.

Sequential Measurement

When the ADT7463 monitoring sequence is started, it cycles

sequentially through the measurement of analog inputs and the

temperature sensors. Measured values from these inputs are

stored in value registers. These can be read out over the serial

bus or can be compared with programmed limits stored in the

limit registers. The results of out-of-limit comparisons are stored

in the status registers, which can be read over the serial bus to

flag out-of-limit conditions.

Processor Voltage ID

Five digital inputs (VID0 to VID5—Pins 5 to 8, 19, and 21) read

the processor voltage ID code and store it in the VID register,

from which it can be read out by the management system over

the serial bus. The VID code monitoring function is compatible

with both VRM9.x and future VRM10 solutions. Additionally,

an SMBALERT can be generated to flag a change in VID code.

ADT7463 Address Selection

Pin 13 is the dual-function PWM3/ADDRESS ENABLE pin.

If Pin 13 is pulled low on power-up, the ADT7463 reads the

state of Pin 14 (TACH4/ADDRESS SELECT/ THERM pin) to

determine the ADT7463’s slave address. If Pin 13 is high on

power-up, then the ADT7463 defaults to the SMBus slave

Address 0x2E. This function is described in more detail later.

INTERNAL REGISTERS OF THE ADT7463

A brief description of the ADT7463’s principal internal registers

is given below. More detailed information on the function of

each register is given in Tables IV to XLII.

Configuration Registers

The configuration registers provide control and configuration of

the ADT7463, including alternate pinout functionality.

Address Pointer Register

This register contains the address that selects one of the other

internal registers. When writing to the ADT7463, the first byte

of data is always a register address, which is written to the

address pointer register.

Status Registers

These registers provide the status of each limit comparison and

are used to signal out-of-limit conditions on the temperature,

voltage, or fan speed channels. If Pin 10 or Pin 22 is con-

figured as SMBALERT, then this pin asserts low whenever a

status bit gets set.

Interrupt Mask Registers

These registers allow each interrupt status event to be masked

when Pin 10 or Pin 22 is configured as an SMBALERT output.

VID Register

The status of the VID0 to VID5 pins of the processor can read

from this register. VID code changes can also generate

SMBALERT interrupts.

Value and Limit Registers

The results of analog voltage inputs, temperature, and fan speed

measurements are stored in these registers, along with their

limit values.

Offset Registers

These registers allow each temperature channel reading to be

offset by a twos complement value written to these registers.

TMIN Registers

These registers program the starting temperature for each fan

under automatic fan speed control.

TRANGE Registers

These registers program the temperature-to-fan speed control

slope in automatic fan speed control mode for each PWM output.

Operating Point Registers

These registers define the target operating temperatures for each

thermal zone when running under dynamic TMIN control. This

function allows the cooling solution to adjust dynamically in

response to measured temperature and system performance.

Enhance Acoustics Registers

These registers allow each PWM output controlling fan to be

tweaked to enhance the system’s acoustics.

Rev. 4 | Page 6 of 52 | www.onsemi.com

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