STE12PS datasheet(16/44 Pages) STMICROELECTRONICS

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Functional description

STE12PS

16/44

Monitor overload FSM

This FSM manages all operations related to monitoring an overload event.

All operations described below are related to channels currently powered.

●

STARTUP: the following operations are related to a startup procedure:

–

START: channel to be monitored is selected.

●

POWER MEASUREMENT: the following operations are related to a power

measurement procedure

–

SAMPLE Imeas: the current measurement is sampled and the next powered

channel is prepared for the next monitor procedure.

–

MEASURE Power: the power is measured and its value is compared against the

required Power class.

–

START MONITOR OVERLOAD: if the measured power exceeds the required

power class the Tovld timer and the averaging process are started.

–

COUNTER RESET: Tovld timer is reset if the measured power doesn’t exceed the

required

●

POWER REMOVAL: the following operations are related to a power removal

procedure:

–

COUNTER CHECK: all Tovld timers are checked, and those that have expired are

identified.

–

POWER REMOVAL: all the channels whose timers have expired and whose

average power exceeds the maximum are switched OFF through the

POWER_EN(n) pins.

–

ALARM SET: for all the channels whose timers have expired, a corresponding

alarm flag is raised in the Channel Event registers, and the related Ted timer is

started.

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