L9680 datasheet(31/277 Pages) STMICROELECTRONICS

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L9680

Start-up and power control

276

Figure 5. 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 to within specified limits.

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

under voltage lockouts. As Twakeup timeout 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. An SPI command to

enter sleep state would not be executed.

No change in system status, an SPI command to turn off switchers would be ignored.

No change in system status, but an 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 of the power

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

WAKEUP

<1ms

1ms

<1ms

1ms

10ms

SLEEP MODE

ACTIVE MODE

PASSIVE MODE

WU_on

WU_off

WakeUpFilt

GAPGPS02251

Table 4. Functions disabling by state

Functions

Power MODE

Power

off

Sleep

Active

Passive

Power

off

Wakeup

monitor

Awake

Startup

Run

Power mode

shutdown

VINGOOD

blanking

Wakeup detector

Internal regulators

ERBOOST regulator

SYNCBOOST regulator

ER CAP charge current

ER CAP discharge current

ER switch

COVRACT

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