L9908 datasheet(34/152 Pages) STMICROELECTRONICS

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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.

Table 26. Internal managed faults reaction details

Fault flag

Device fault

Half Bridge fault

FRC available

STD_VGS_n=1

(1)(2)(3)

HSn_STG = 1

(1)(2)(3)

LSn_STG=1

(1)(2)(3)

VDH_UV=1

(1)(3)

VDH_OV=1

(1)(3)

VBP_UV=1

(1)(3)

VBP_OV=1

(1)(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.

Note:

•

While other configurations are available for all FHC faults the configuration 01 is available only on a

limited subset. In faults that do not support such an FRC the configuration 01 is reserved.

•

For VDH_UV, VDH_OV, VBP_UV, VBP_OV and CFG_CRC_FAIL the configuration 01 has the same

effect as configuration 10 and 11.

5.6.1.2

Fault Output Redirection (FOR)

L9908 implements a double source of fault signaling by pin FS_FLAG and by a dedicated SPI field present in

every frame.

FS_FLAG output can be configured in push-pull mode or in open-drain mode by means of the following SPI bit:

Table 27. Fault output redirection configuration bit

FS_FLAG_CFG

Description

Push-pull (Default)

Open-drain

The pin FS_FLAG is asserted LOW and the IC ERR flag is set to ‘1’ if a STD fault is detected which has been

configured to be redirected externally via <FLT_REF>_REDIRECT_CFG.

The pin FS_FLAG is asserted HIGH and IC ERR flag is set to ‘10’ when the STD failure condition disappears.

Table 28. IC ERR status bits

IC ERR1

IC ERR0

Description

NO STD Fault (Default)

NO STD Fault

STD Fault

L9908

Functional description

DS13546 - Rev 5

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