L9301 datasheet(29/54 Pages) STMICROELECTRONICS

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DS11400 Rev 9

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L9301

Low side driver

9.3.5

DLOSS

When the L9301 is configured with low side and external diodes are used for freewheeling,

there is the possibility through a dedicated SPI bit to enable the ‘diode loss’ diagnosis that is

used to detect if the external diode is no more connected checking if during the OFF phase

the internal clamp is activated. In case of fault is stored in DLOSS SPI flag. In order to reset

the flag a 0 has to be written by microcontroller. Another SPI bit allows configuring the

actions to be taken in case of DLOSS fault.

When the L9301 is configured as high side and internal/external diodes are used for

freewheeling, there is the possibility through a dedicated SPI bit to enable the ‘diode loss’

diagnosis that is used to detect if the diode is no more connected checking if during the OFF

phase the HS is forced to switch on. In case of fault is stored in DLOSS SPI flag. In order to

reset the flag a 0 has to be written by microcontroller. Another SPI bit allows configuring the

actions to be taken in case of DLOSS fault.

In addition, diode loss on LS (including configurable channels configured as LS) is only

detected when VBOV is not present.

9.3.6

OFF state diagnostic

The device provides the off-state diagnostic for each channel.

In low-side configuration the short to ground and open load faults can be detected. The fault

is reported in a SPI register. The pull-up current on the single channel can be disabled using

the dis_source bit in registers CR1-CR12. The OFF diagnostic can be disabled using the

dis_diag_off bit in registers CR1-CR12.

Figure 10. LS configuration diagnostic

Table 21. Charge pump

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

CP_DELTA Delta voltage CP-VB

VB>5V

SRCx

DRNx

VTGND

VTOPEN

GATE

DRIVER

off state

VOUTOPEN

DIAGOL

DIAGLV

ILOADx

I_LS_PD

I_LS_PU

GAPG0309151526PS

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