ADM9264

–10–

REV. 0

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

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.

SU1

10k

Ω

SUPER I/O

CHIP

MICROPROCESSOR

SU2

10k

Ω

SU3

10k

Ω

SU4

10k

Ω

ERRX

FAN

(ALARM MONITOR)

AD22105

TEMPERATURE

SENSOR

6

7

1

2

3

PSU #1

12V

PSU #2

5V

PSU #3

3.3V

PSU #4

2.8V

DIS

SU4DET

ADM9264

ERR3

ERR1

ERRY

ERR4

ERR2

Figure 23. Typical Application of ADM9264

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.