VS6624P0LP datasheet(13/100 Pages) STMICROELECTRONICS

13 / 100 page

VS6624

Operational modes

Rev 1

13/100

Operational modes

VS6624 has a number of operational modes. The power down mode is entered and exited

by driving the hardware CE signal. Transitions between all other modes are initiated by I²C

transactions from the host system or automatically after time-outs.

Figure 2.

State machine at power -up and user mode transitions

Power Down/Up

The power down state is entered from all other modes when CE is

pulled low or the supplies are removed.

During the power-down state (CE = logic 0)

●

The internal digital supply of the VS6624 is shut down by an internal switch

mechanism. This method allows a very low power-down current value.

●

The device input / outputs are fail-safe, and consequently can be considered

high impedance.

Supplies Off

Standby

Power-Down

CE pin LOW

CE pin

Pause Mode

Supplies

turned-off

Supplies

turned-on

& CE pin LOW

Supplies

turned-off

Stop Mode

Run Mode

HIGH

State Machine at power-up

I2C controlled user mode transitions

Uninitialised

Flashgun

Note; Depending on the snapshot

exit transition settings the device will

revert to RUN or PAUSE state

automatically after snapshot

It is possible to enter any of

the user modes direct from the

uninitialised state via an I2C

command

System state changes

Host initiated state

changes

Snapshot

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