L9961 datasheet(10/65 Pages) STMICROELECTRONICS

10 / 65 page

Once L9961 acknowledges the GO2STBY command, it moves to STANDBY state after TGO2STBY. To allow a

smooth transition, MCU must move to a low power state (where its average current consumption is less than

IVREG_STBY) within TMCU2STBY after sending GO2STBY command to L9961.

To avoid inadvertent reactivation, the WAKEUP pin shall be set low before sending the GO2STBY command, and

it shall be kept low during the transition to STANDBY.

Figure 3. Timing diagram: transition from NORMAL to STANDBY upon GO2STBY command

GADG230620221116SA

3.1.3

NORMAL

The NORMAL state is recommended when the system is working. All IC functions are active, including voltage/

temperature/current monitoring and protection. Pack relay management and I²C peripheral are also available.

L9961 current consumption from VB pin while in NORMAL state varies over time, due to the execution of

periodical tasks, balancing activation/deactivation, pre-driver turn on/off events.

NORMAL state can be reached:

•

from STANDBY state, if WAKEUP pin is higher than VWAKEUP_TH for at least TWAKEUP_STBY. Refer to

Figure 4

–

The wakeup source can be either an external stimulus (pushbutton or other) or the system MCU

asserting the WAKEUP pin via GPIO (refer to Figure 1)

–

Transition from STANDBY to NORMAL must be properly handled, as VREG regulator needs to switch

from reduced performance to full power within a defined time window. Such an operation requires

TSTBY2NORMAL from the receival of the WAKEUP condition to be accomplished

–

During TSTBY2NORMAL, VREG can sustain a load current up to IWAKEMAX for a maximum TWAKEMAX

time interval, within which the MCU must wakeup L9961

–

After TSTBY2NORMAL, the VREG regulator has reached its NORMAL state specification. After

TI2C_READY a RDY pulse is generated to mark the transition to NORMAL. This allows the MCU to

fully operate in its normal state, respond to watchdog, serve interrupts, and so on. L9961 is capable of

decoding I2C commands and receive new configurations

–

It takes TCP_STARTUP from the receival of WAKEUP condition for the charge pump to be ready. After

TCP_STARTUP, L9961 will run monitoring/diagnostic tasks and manage the pre-driver stage

–

Once L9961 is in NORMAL the MCU is expected to set the WAKEUP pin low to reduce current

consumption.

L9961

Device funcional states

DS14012 - Rev 3

page 10/65

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