ADM9264ARN-REEL Просмотр технического описания (PDF) - Analog Devices

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ADM9264ARN-REEL

Quad Power Supply Monitor for Desktop PCs

Analog Devices 

ADM9264

APPLICATIONS

A typical application of the ADM9264 is shown in Figure 23.

The analog inputs SU1 to SU4 are connected to the four power

supply outputs of a system to monitor the supply voltages.

One of the digital inputs, ERRY, is connected to a temperature

sensor such as the TMP01 or AD22105. The trip point of the

overtemperature comparator is set by RSET so that the output

goes low when the temperature exceeds safe limits. (See the

appropriate Analog Devices data sheet for more information on

these devices.)

The other digital input, ERRX, is connected to a fan failure

sensor. This can be something as simple as a vane switch

mounted in the fan air flow, which opens if the air flow fails.

The digital outputs of the ADM9264 are interfaced to the

system microprocessor through the GPIO lines or via an I/O

adapter chip. Depending on the level of fault diagnostics

required in the system, the four error outputs (ERR1 to ERR4)

corresponding to the analog inputs SU1 to SU4 can be indi-

vidually connected to the I/O chip to give specific indication of

which supply voltage has failed, while the PWROK output

indicates an overtemperature or system cooling failure. Alter-

natively, the PWROK output can be used alone to give a

nonspecific failure indication.

PSU #1

12V

PSU #2

5V

PSU #3

3.3V

PSU #4

2.8V

SU1

SU2

SU3

SU4

VCC

ERR1

10kΩ

VCC

ERR2

10kΩ

VCC

ERR3

10kΩ

VCC

ERR4

10kΩ

SUPER I/O

CHIP

MICROPROCESSOR

RSET

FAN

(ALARM MONITOR)

ERRX

6

7

AD22105

TEMPERATURE

SENSOR 1

3

2

VCC

ADM9264

ERRY

DIS SU4DET

Figure 23. Typical Application of ADM9264

–10–

REV. 0

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