L9961 datasheet(30/63 Pages) STMICROELECTRONICS

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Fault type

Assertion condition

IC reaction to

assertion

Release condition

IC reaction to flag

clear

Maskable

Overcurrent in

discharge

If the ISENSEP –

ISENSEM voltage

raises above

VOVC_DCHG_TH, the

OVC_DCHG fault is

acknowledged.

The OVC_DCHG flag

is set

If the ISENSEP –

ISENSEM voltage

falls below VOVC_TH,

the OVC_DCHG flag

can be cleared by

MCU

The Discharge FET

is restored to the

status defined by the

DCHG_ON bit

CSA_EN masks

measurement

execution. When

disabled, the

DOVC_CHG flag can

always be cleared

The discharge FET is

turned OFF

FAULTN line is

released

OVC_EN masks

diagnostic execution.

When disabled, the

OVC_DCHG flag can

always be cleared

FAULTN line is

asserted

OVC_DCHG_PRDRV

_MSK masks reaction

on DCHG pin

OVC_DCHG_FAULT

N_MSK masks

reaction on FAULTN

Persistent discharge

current

If the DCHG FET is

OFF (either

commanded by user

or forced by

diagnostics) and the

ISENSEP –

ISENSEM voltage

raises above

VPERSIST_OVC_TH, for

4 consecutive

samples, the

PERSIST_OVC_DCH

G fault is

acknowledged.

The

PERSIST_OVC_DCH

G flag is set

If the ISENSEP –

ISENSEM voltage

falls below

VPERSIST_OVC_TH for

4 consecutive

samples, the

PERSIST_OVC_DCH

G flag can be cleared

by MCU

FUSE pre-driver is

disabled

CSA_EN masks

measurement

execution. When

disabled, the

PERSIST_OVC_DCH

G flag can always be

cleared

FUSE pre-driver is

enabled

If DCHG FET is ON

and OVC_EN is

ENABLE, the

PERSIST_OVC_DCH

G counter is reset to 0

FAULTN line is

released

OVC_EN masks

diagnostic execution.

When disabled, the

PERSIST_OVC_DCH

G flag can always be

cleared

FAULTN line is

asserted

PERSIST_OVC_DCH

G_FUSE_MSK

masks reaction on

FUSE pin

PERSIST_OVC_DCH

G_FAULTN_MSK

masks reaction on

FAULTN pin

3.5.3.1

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 21. Overcurrent electrical parameters

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VOVC_CHG_TH

Programmable overcurrent in

charge threshold (8 bit)

VOVCCHGTH=

−128VCUR_RES*CODE

Tested by SCAN

–

VCUR_RES(2NBIT_CSA-

1 – 128)

VOVC_DCHG_TH

Programmable overcurrent in

discharge threshold (8 bit)

Tested by SCAN

VCUR_RES(2NBIT_

CSA-1 – 128)

L9961

Current conversion routine

DS14012 - Rev 1

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