L99ASC03 datasheet(25/73 Pages) STMICROELECTRONICS

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L99ASC03

Device description

2.18

Diagnostics

All diagnostic functions are internally filtered and each fault/warning condition has to be

valid for a defined time before the corresponding status bit is set in the status register. The

filters are used to improve the noise immunity of the device. Several error types and

warnings can be distinguished. All errors and warnings are reported in the corresponding

status bits and are mirrored in the associated bits of the Global Status Byte (GSB).

•

The device reacts to several error types by changing its state. The different error types

can be grouped as follows:

•

fail-safe errors (mirrored in the FS bit of the GSB)

•

device errors (mirrored in the DE bit of the GSB)

•

functional errors (mirrored in the FE bit of the GSB)

•

physical-layer errors (mirrored in the PLE bit of the GSB)

•

SPI errors (mirrored in the SPIE bit of the GSB)

In order for the device to recover from an error condition, the error itself must be removed

and the associated status bit in the device has to be cleared via SPI by a “Read & Clear”

command.

Warning functions are intended only for information and will not change the state of the

device. Warnings are mirrored in the GW bit of the GSB. To clear a warning, the source of

the warning must be removed and the associated flag has to be cleared via SPI by a “Read

& Clear” command.

Table 5. Diagnostics overview

Source

Cause

Event type

Diagnosis

Device action

Clear error /

warning flag

MCU

Watchdog not

triggered or

triggered out of the

open window

FS (FS = 1 in the

GSB)

FSWD = 1;

Watchdog fail

counter WDF>0

– NRES asserted low

– Gate drivers

actively discharged;

charge pump, CSA

and BEMF module

OFF

– Control registers

(except Control

DSFT_DIS) reset to

default value

– After NRES is

released,

write

WDTRIG = 1

during

watchdog

long open

window to

reset WDF

counter bits

– Read & Clear

FSWD

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