L9300 datasheet(61/182 Pages) STMICROELECTRONICS

61 / 182 page

Figure 34. Driver behavior in short to GND condition: HS_config=1, SW_cntr=1, OVC_R=1

GADG1807171607PS

Figure 35. Driver behavior in short to battery condition: HS_config=1, SW_cntr=1, OVC_R=1

GADG1807171607PS

Solenoid supply disconnection

When solenoid driver is configured in LS configuration recirculation happens through the internal HS FET. If the

supply of HS power stage is lost, due to the inductive nature of the load, voltage at LOADx pin could rise above

absolute ratings damaging the device; to prevent such a condition a clamping structure is integrated in the LS

driver. If the clamping structure is activated in normal operation it means a disconnection of HS supply happened:

as a consequence the solenoid channel is put in tristate and a dedicated diagnostic bit is set. To restart the

channel the microcontroller has to clear the fault bit (reading the fault register) and to enable the channel again.

LS clamp circuitry is automatically disabled when VBATP over voltage is detected to avoid unwanted clamp

activation during load dump event.

OFF State Diagnostic

The device provides off-state diagnostic for each channel; simplified schematic of implemented diagnostic is

shown in Figure 36 and Figure 37 depending on the chosen configuration.

L9300

Solenoid driver

DS12258 - Rev 4

page 61/182

L9300 Datasheet(PDF) 61 Page - STMicroelectronics