L9301 datasheet(23/51 Pages) STMICROELECTRONICS

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L9301

Configurable high/low side driver

The charge pump is OFF if VB< UV threshold or VDD< UV threshold. The CP voltage is

equal to VB-Vbe.

When the CP is ON, the low CP diagnosis is enabled. When any HS is switched on but CP

voltage is not high enough to switch on HS, low CP fault is detected. A SPI bit allows

configuring the actions to be taken in case of low CP fault.

8.2.5

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. 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. 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.

8.2.6

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.

Figure 9. LS configuration diagnostic

Table 14. Charge pump

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

CP_DELTA Delta voltage CP-VB

VB>5V

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