L9963E datasheet(70/184 Pages) STMICROELECTRONICS

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Figure 20. Equivalent open resistance vs.cell voltage

In case of balance open detection on an enabled cell:

•

Corresponding fault flag is set and latched into BALX_OPEN register

•

Fault is propagated through the FAULT Line

•

Voltage conversion routine goes into Configuration Override

For further details see Section 4.12 Voltage conversion routine.

This safety mechanism is also able to detect loss of cell PCB connector. In fact, if Celln positive terminal is

disconnected from PCB, both BALn_OPEN and BALn+1_OPEN failures will be flagged. Two exceptions:

•

If PCB connector to cell14 positive terminal (C14) is lost, only BAL14_OPEN flag will be set

•

If PCB connector to cell1 negative terminal (C0), CELL0_OPEN flag will be set

4.11.9

Balancing short load diagnostic

The detection of the short load is implemented through the detection of overcurrent: if the balance current

exceeds the overcurrent threshold IBAL_OC for a time longer than TBAL_OVC_DEGLITCH a diagnostic short fault is

reported. Such a diagnostic is active during Power balance ON condition.

Balance comparator has a self test mechanism used to check internal integrity. In case BIST fails

(BIST_BAL_COMP_HS_FAIL or BIST_BAL_COMP_LS_FAIL), balancing is stopped.

In case of short detection:

•

Corresponding fault flag is set and latched into register BALx_SHORT

•

Fault is propagated through the FAULT Line

•

Balance is stopped on the involved cell

Balance short detection is always active, even in low power modes (Silent Balancing, Cyclic Wakeup). When a

failure is detected in low power states, balancing will be immediately stopped; however, the device will not wake

up. FAULT Line and related fault latch will be triggered once the device has moved to Normal, following a wake

up condition.

4.11.10

Balancing secondary timing

Secondary balancing timer is used to avoid over-discharge when manual balancing stop command

communication failure or primary balancing timer function disorder happens.

L9963E

Safety and diagnostic features

DS13636 - Rev 12

page 70/184

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