BQ76PL536APAP datasheet(20/60 Pages) TI

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COV_FAULT

–

VC6

VC5

VC4

VC3

VC2

VC1

COVT Filter

Latch

VC6

LEVEL

SHIFTER

VSS

PROTECTOR

REFERENCE

CONFIG_COV[]

TRIP

SETPOINT

COV COMPARATOR

(one per cell)

STATUS

FAULT

ALERT

–

ECC_

COR

UVLO

CBT

DRDY

FAULT

FORCE

POR

CRC

CUV

COV

FAULT_N

FAULT_S

FAULT_H

IO_CONFIG[7]

bq76PL536A

SLUSAD3A – JUNE 2011 – REVISED AUGUST 2012

www.ti.com

Cell Overvoltage Fault Detection (COV)

When the voltage across a cell exceeds the programmed COV threshold for a period of time greater than set in

the COV timer (COVT), the COV_FAULT[] flag for that cell is set. The bits in COV_FAULT[] are then ORed into

the FAULT[COV] flag, which is then ORed into the DEVICE_STATUS[FAULT] flag, which causes the FAULT_S

(_H) pin also to be asserted. The COV flag is latched unless COVT is programmed to 0, in which case the flag

follows the fault condition. Care should be taken when using this setting to avoid chatter of the fault status. To

reset the FAULT flag, first remove the source of the fault (i.e., the overvoltage condition) and then write a 1 to

FAULT[COV], followed by a 0 to FAULT[COV].

The voltage trip point is set in the CONFIG_COV register. Set points are spaced every 50 mV. Hysteresis is

provided to avoid chatter of the fault sensing. The filter delay time is set in the CONFIG_COVT[] register to

prevent false alarms. A start-up deglitch circuit is applied to the timers to prevent false triggering. The deglitch

time is 0–50 µs, and introduces a small error in the timing for short times. For both COVT and CUVT, this can

cause an error greater than the 10% maximum specified for delays <500 µs.

Figure 7. COV FAULT Simplified Logic Tree

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