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Data Sheet

ADCMP671

Rev. 0 | Page 15 of 16

OUTPUTS

The PWRGD output is used to indicate supply power good for

the rail being monitored. It asserts if the monitored voltage falls

within the UV and OV threshold window. The OV output acts

as a dedicated overvoltage indication output, allows the board

manager to take decisive action to protect the system from

overvoltage faults. Both outputs are open-drain and can be

pulled up to voltages above VDD. These outputs are capable of

sinking current up to 40 mA.

In the multisupply monitoring application, multiple ADCMP671

can be used with their OV pin tied together to generate a single

overvoltage fault alert signal, as shown in

. During power

up and power down, the power management processor of the

board can manage supply sequencing based on PWRGD signals.

In the event of supply overvoltage fault, the processor can react

quickly to the provide necessary circuit protection because of its

dedicated

Figure 35

OV alert. The processor is also able to identify the faulty

supply from combining the information on the PWRGD pins.

This allows the processor to use the N + 1 input pins to

individually monitor N channels of supplies.

2.5V

PWRGD

2.5V GOOD

1.8V GOOD

1.0V GOOD

0.9V GOOD

OV FAULT

BOARD

MANAGER

ADCMP671

1.8V

PWRGD

ADCMP671

1.0V

PWRGD

ADCMP671

0.9V

PWRGD

ADCMP671

Figure 35. N Rails Monitoring with N + 1 Processor I/O

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