L9961 datasheet(32/63 Pages) STMICROELECTRONICS

32 / 63 page

Fault type

Assertion condition

IC reaction to

assertion

Release

condition

IC reaction to flag

clear

Maskable

Persistent short-circuit

in discharge

If the DCHG FET

is OFF (either

commanded by user

or forced by

diagnostics) and the

ISENSEP – ISENSEM

voltage raises above

VPERSIST_SC_TH, the

PERSIST_SC_DCHG

fault is acknowledged.

Diagnostic is masked

for TPERSIST_SC_BLANK

starting from DCHG

FET OFF event.

FAULTN line is

asserted

If the If the

(ISENSEP –

ISENSEM)

voltage falls

below

VPERSIST_SC_

TH for longer

than

TSC_FILTER,

the

PERSIST_SC

_DCHG flag

can be

cleared by

MCU

FAULTN line is

released

PERSIST_SC_DCHG_

FAULTN_MSK masks

reaction on FAULTN

3.5.4.1

Electrical parameters

All parameters are tested and guaranteed in the following conditions, unless otherwise noted:

VB according operating range of Table 4; TJ according operating range of Table 7.

Table 23. Short-circuit in discharge electrical parameters

Symbol

Parameter

Test

conditions

Min.

Typ.

Max. Unit

VSC_RES

Short-circuit measurement resolution

Design info

2.34 (300 mV/27)

TSC_FILTER

Programmable short-circuit in discharge filter

time (3 bit)

TSCFILTER=32us*2CODE

Tested by

SCAN

512

μs

VSC_TH

Programmable short-circuit in discharge

threshold (4 bit)

VSCTH=49.14mV+14.04mV*CODE

275

VPERSIST_SC_TH

Programmable persistent short-circuit in

discharge threshold (4 bit)

VSCPERSISTTH=49.14mV+14.04mV*CODE

275

VSC_TH_TOL

VSC_TH gain error

-10

+10

VSC_TH_OFFSET

VSC_TH offset error

-5

TPERSIST_SC_BLANK

Persistent short-circuit in discharge blanking

time

224

256

μs

3.6

Cell balancing

L9961 provides passive cell balancing by discharging battery cells through the Cx pins. To activate the balancing

switch on a cell, the corresponding BAL<x>_ON bit must be set. Balancing is inhibited if cell voltage falls below

the balance undervoltage threshold (refer to Section 3.4.1 Cell voltage monitor (Cx)).

Balancing current must be limited to a maximum of IBAL_MAX via cell filtering resistors. It is recommended

balancing only non-adjacent cells. Care must be taken if balancing adjacent cells in order not to violate the

IBAL_MAX constraint.

To allow cell voltage relaxation, balancing is stopped TBAL_SETTLING before running the first step of the

Section 3.4 Voltage conversion routine. It is then automatically re-engaged after the VB step completion.

L9961

Cell balancing

DS14012 - Rev 1

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