L99ASC03 datasheet(28/73 Pages) STMICROELECTRONICS

28 / 73 page

Device description

L99ASC03

28/73

DocID023504 Rev 7

Some specific fail-safe errors will force the device to transition to VBAT Standby Mode in

order to avoid potential damage to the system. Table 6 provides an overview of these cases.

The device leaves the VBAT Standby Mode upon any wake-up event.

Temperature

Tj >TW1

GW (GW = 1 in

the GSB)

TW1 = 1

None

Read & Clear

TW1

Tj >TW2

GW (GW = 1 in

the GSB)

TW1 = 1

TSD1/TW2 = 1

None

Read & Clear

TSD1/TW2 (and

TW1)

Tj > TSD1

DE (DE = 1 in

the GSB)

TW1 = 1

TSD1/TW2 = 1

Gate drivers actively

discharged; charge

pump, CSA and

BEMF module OFF

Read & Clear

TSD1/TW2 (and

TW1)

Tj > TSD2

FS (FS = 1 in the

GSB)

TW1 = 1

TW2/TSD1 = 1

TSD2 = 1

– Gate drivers

actively discharged;

charge pump, CSA

and BEMF module

OFF

– Control registers

(except control

DSFT_DIS bit)

reset to default

value

– VDD turned off

Read & Clear

TSD2

Charge pump

undervoltage

(VCP<VCPLOW)

when charge pump

running

- GW (GW = 1 in

the GSB) if

CPLOWM = 0

- FE (FE = 1 in

the GSB) if

CPLOWM = 1

CPLOW = 1

Gate drivers disabled

if CPLOWM = 1

Read & Clear

CPLOW

Charge pump

undervoltage

(VCP<VCPLOW)

after charge pump

is enabled

- GW (GW = 1 in

the GSB) if

CPLOWM = 0

- FE (FE = 1 in

the GSB) if

CPLOWM = 1

NRDY = 1

Gate drivers disabled

regardless of

CPLOWM control bit

value

Self cleared

Table 5. Diagnostics overview (continued)

Source

Cause

Event type

Diagnosis

Device action

Clear error /

warning flag

Table 6. Forced VBAT standby mode

Source

Cause

Diagnosis

Clear error flag

MCU

Watchdog not triggered or

triggered out of the open window

for 15 consecutive times

(WDF = 1111)

FSWD = 1

Read & Clear FSWD

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