L9963E datasheet(18/184 Pages) STMICROELECTRONICS

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The device is still able to communicate if VTREF and Bootstrap power up fails: VCOM regulator is started anyway.

It is not recommended to send any SPI frame to the device before TWAKEUP expires. Any incoming frame while

L9963E is still performing the power up routine might be discarded.

4.1.5

Silent Balancing state

There is the possibility to perform the balancing of one (or more) cells with a reduced current consumption with

respect to doing that in Normal mode: this state is called Silent Balancing.

In Silent_Bal the same resources as in Sleep state are active, in addition to the balance predrivers and the

necessary bias circuitry.

To enter in Silent Balancing state from Normal state, the following conditions shall be verified:

Cell balancing must be ON

The slp_bal_conf flag shall be set to ‘1’

A “go to sleep” condition shall be verified (either an explicit GO2SLP command or communication timeout

expiration)

If a cell balancing is previously demanded in Normal mode and the slp_bal_conf flag is set to 1, when a

condition to go to sleep (low consumption) occurs the device enters Silent Balancing, not Sleep state and the

required cell-balancing starts (or continues).

3 possible leaving ways from Silent Balancing mode:

•

any wake up signal on communication or FAULT Line can force the chip to stop the balancing and then go

back to the Normal state. Any protocol frame recognized as electrically consistent will wake up the device.

However, the command will not be interpreted and thus no execution takes place.

•

an external Fault must bring the device to Normal state and stop the balancing.

•

as soon as the required balancing target is finished, the EOB (End of Balancing) bit is set to one and the

chip enters the Sleep state.

If the Cyclic signal is raised the device goes to Cyclic_Wup state, runs the diagnosis then it goes back to Silent

Balancing (if slp_bal_conf flag = 1) where the balancing resumes.

4.1.5.1

Operations in Silent Balancing state

Here below a list of operations the device can perform during Silent Balancing state.

Table 9. Operations in Silent Balancing state

Operation

Timing mode

Functions involved

Balancing low power

Always ON

Balancing timer, Drivers ON, Balance short comparators

Wakeup management

Always ON

Wakeup logic and wakeup sources interfaces ON

4.1.6

Cyclic wake up state

From both Sleep and Silent Balancing states, the device moves periodically (once every tCYCLIC_SLEEP) to

Cyclic_Wup state in order to perform a fault monitoring.

Diagnostic checks are done in this state as well as always-on monitorings. ADC must be ON to check possible

critical battery conditions. Any detected fault moves the device to the Normal state.

An “On-demand” operation is only possible once the device has moved to Normal in case of any detected fault

Possible ways to leave this state:

•

Any fault detected during this mode moves the device to the Normal state.

•

A wake up from Fault line or Comm lines moves the device to the Normal state. Any protocol frame

recognized as electrically consistent will wakeup the device. However, the command will not be interpreted

and thus no execution takes place

•

If the defined monitoring tasks are finished, the device can move to the SLEEP or SILENT BALANCING

states automatically based on the state before Cyclic Conversions (slp_bal_conf flag).

4.1.6.1

Operations in Cyclic wake up state

Here below a list of operations the device can perform during Cyclic wake up state.

L9963E

Device functional state

DS13636 - Rev 12

page 18/184

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