L9908 datasheet(32/152 Pages) STMICROELECTRONICS

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Symbol

Parameter

Min

Typ

Max

Unit

Notes

T_selftest_time_out

SELF TEST Mode Time-out

0.77

0.88

0.99

Not subject to production test

5.6

Fault Handling Management (FHM)

The fault set is divided into two main categories based on the required corrective actions:

•

STD (Shutdown Faults): this set includes faults which are highly dangerous for the IC or the application and

that needs a quick corrective action to avoid harming;

•

WRN (Warnings): this set includes all those faults against which the application and the device are tolerant

and the corrective action can be waived or delayed.

L9908 allows a certain degree of fault management customization a subset of available enabled faults can be

configured by setting the proper FHC registers.

Table 24. Fault summary

Fault Flag

Source Diagnosis

Self-Check

Failure Reaction

Fault Description

INT_RST=1

Internal Supply

Monitor

Yes

RESET

Under-voltage on V3V3_ANA

INT_RST=1

Internal Supply

Monitor

Yes

RESET

Under-voltage on V3V3_DIG

INT_RST=1

Internal Supply

Monitor

Yes

RESET

Over-voltage on V3V3_ANA

INT_RST=1

Internal Supply

Monitor

Yes

RESET

Over-voltage on V3V3_DIG

INT_RST=1

VDD Monitor

Yes

RESET

Under-voltage on VDD

VDD_OV=1

VDD Monitor

Yes

SAFE-OFF

Over-voltage on VDD

INT_RST=1

ICM

Yes

RESET & SAFE_OFF

Main clock stuck violation

CLK1_ERR=1

CLK2_ERR=1

CLK2_TIME_OUT=1

ICM

Flag only (NORMAL)

Oscillators mismatch or auxiliary clock

stuck violation

PGND_LOSS=1

AGND_LOSS=1

DGND_LOSS=1

GLM

Yes

Flag only (NORMAL)

Loss of power or signal grounds

OTM_SD=1

OTM

SAFE-OFF

Thermal shutdown

OTM_WR=1

OTM

Flag only (NORMAL)

Thermal warning

STDn_PWM =1

[n=1,2,3]

STD on PWM

Ignore overlapping

PWM command

Shoot through on half bridge n (PWM

input)

STDn_VGS =1

[n=1,2,3]

STD on VGS

Configurable

Shoot through on half bridge n (Ext.

FET Vgs)

HSn_STG = 1

[n=1,2,3]

OND

Yes

Configurable

Short to ground on SHS_n

LSn_STB=1

[n=1,2,3]

OND

Yes

Configurable

Short to battery on SHS_n

HS2_OFD=1

LSn_OFD=0

[n=1,2,3]

OFD

Yes

Flag only (NORMAL)

Short to ground on one or multiple

motor phase

HS2_OFD=0

LSn_OFD=1

OFD

Yes

Flag only (NORMAL)

Short to battery on one or multiple

motor phase

L9908

Functional description

DS13546 - Rev 5

page 32/152

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