L9678P datasheet(22/203 Pages) STMICROELECTRONICS

22 / 203 page

Start-up power control

L9678P, L9678P-S

22/203

DocID029274 Rev 3

Figure 4. Wake-up input signal behaviour

Condition summary:

No change of sleep mode state but current consumption may exceed specification for

sleep mode.

The sleep mode current returns within the specified limits.

Power supply exits sleep mode. Switchers start operating if applicable voltages exceed

under voltage lockouts. As Twakeup time-out is not elapsed, a low level at WAKEUP

instantaneously sends the system back to sleep.

Sleep Reset is released and the entire system starts operating. A SPI command to

enter sleep state would be ignored.

No change in system status, a SPI command to enter sleep state would be ignored.

No change in system status, but a SPI command to turn off switchers would be

accepted and turn the system off.

With the below table, all the functionalities of the device are shown with respect to the power

states. When one function is flagged, the related circuitry cannot be activated on that state.

Table 4. Functions disabling by state

Function

Power

Off

Wake-up

monitor

Awake

Start-up

Run

Power

mode

shutdown

Wakeup detector

Internal regulator

ERBOOST regulator

VSUP regulator (L9678P-S only)

ER CAP charge current source

ER switch

COVRACT Output

VDD5 regulator

VDD3V3 regulator

Deployment drivers

VSF safing FET regulator

Remote sensor interfaces

(L9678P-S only)

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