Power Control - Congatec COM Express conga-TCA5 User Manual

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5.1.14

Power Control

PWR_OK

Power OK from main power supply or carrier board voltage regulator circuitry. A high value indicates that the power is good and the module

can start its onboard power sequencing.

Carrier board hardware must drive this signal low until all power rails and clocks are stable. Releasing PWR_OK too early or not driving it low

at all can cause numerous boot up problems. It is a good design practice to delay the PWR_OK signal a little (typically 100ms) after all carrier

board power rails are up, to ensure a stable system.

A sample screenshot is shown below:

Note

The module is kept in reset as long as the PWR_OK is driven by carrier board hardware.

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