L9908 datasheet(33/153 Pages) STMICROELECTRONICS

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Fault Flag

Source Diagnosis

Self-Check

Failure Reaction

Fault Description

VDH_UV=1

MBM

Yes

Configurable

Under-voltage at VDH pin

VDH_OV=1

MBM

Yes

Configurable

Over-voltage at VDH pin

VPRE_UV=1

VPRE Monitor

Yes

Auto-retry

Under-voltage at VPRE pin

VPRE_OV=1

VPRE Monitor

Yes

SAFE-OFF

Over-voltage at VPRE pin

VCP_UV=1

VCP Monitor

Yes

Flag only (NORMAL)

Under-voltage at CP2 output

VCP_OV=1

VCP Monitor

Yes

Flag only (NORMAL)

Over-voltage at CP2 output

VBP_UV=1

VBP Monitor

Yes

Configurable

Under-voltage at VBP pin

VBP_OV=1

VBP Monitor

Yes

Configurable

Over-voltage at VBP pin

WDT_DATA_fail=1

WDT

SAFE-OFF

Watchdog reset failure

WDT_OVF_fail=1

WDT

SAFE-OFF

Watchdog time-out failure

SPI_ERR=1

SPI CRC Check

Ignore Frame

SPI CRC Check failure

SPI_ERR=1

SPI FC Check

Ignore Frame

SPI FC Check failure

SPI_ERR=1

SPI Clock Counter

Check

Ignore Frame

SPI Clock Counter Check failure

NVM_CRC_FAIL=1

NVM Data CRC

Check

SAFE-OFF Load

default values

NVM Data CRC Check

CFG_CRC_FAIL=1

SRR Data CRC

Check

SAFE-OFF

SRR Data CRC Check

BIST_STATUS=11

BIST

SAFE-OFF

BIST Failure

5.6.1

FHC registers

The L9908 default FHM configuration can be modified by properly writing the FHC configuration registers through

the CONFIG mode. FHC are considered as SRR.

5.6.1.1

Fault Reaction Configuration (FRC)

For each one of the fault listed in Table 24 two configuration bits allow to define whether the corrective action shall

be automatically developed by the device itself or it can be waived.

Table 25. Fault Reaction Configuration bits

<FLT_REF>_REACT_CFG1 <FLT_REF>_REACT_CFG0

Description

Full SW Off – disable all HB drivers and CPs, device goes in

SAFE-OFF mode (Default)(1)

Reduced Operation Mode – disable failing HB only, device

remains in NORMAL mode(2)

Flag only – down-rate fault to simple warning, device remains in

NORMAL mode(3)

Flag only – down-rate fault to simple warning, device remains in

NORMAL mode(3)

1. Fault danger for the application is considered high, the corrective action shall be taken as soon as it is detected by the

device itself by disabling all half bridges and charge pumps.

2. Fault danger for the application is considered high, the corrective action shall be taken as soon as it is detected by the

device itself by disabling only the half bridge on which the fault is present still allowing a reduced performance operation.

3. Fault danger for the application is considered low, the fault can be ignored with no corrective action applied nor internal or

external.

The following table details the Fault Reaction Configurations available for the different Fault events.

L9908

Fault Handling Management (FHM)

DS13546 - Rev 3

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