L99DZ120 datasheet(75/162 Pages) STMICROELECTRONICS

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L99DZ120

Application information

161

4.11

Power supply failure

4.11.1

VS supply failure

VS overvoltage

If the supply voltages VS reaches the overvoltage threshold VSOV:



LIN remains enabled



OUT1 to OUT_14 are turned off (default).

The shutdown of outputs may be disabled by SPI (VS_OV_SD_EN (CR 3) = 0)



Charge pump is disabled (and is switched on automatically in case the supply voltage

recovers to normal operating voltage)



H-bridge gate driver is switched into sink condition



Recovery of outputs after overvoltage condition is configurable by SPI:

–

VS_LOCK_EN (CR 3) = 1: outputs are off until Read&Clear VS_OV (SR 2).

–

VS_LOCK_EN (CR 3) = 0: outputs turned on automatically after VS overvoltage

condition has recovered.



The overvoltage bit VS_OV (SR 2) is set and can be cleared with a ‘Read&Clear’

command. The overvoltage bit is reset automatically if VS_LOCK_EN (CR 3) = 0 and

the overvoltage condition has recovered.

VS undervoltage

If the supply voltage VS drops below the under voltage threshold voltage (VSUV):



LIN remains enabled



OUT1 to OUT14 are turned off (default).



The shutdown of outputs may be disabled by SPI (VS_UV_SD_EN (CR 3) = 0)



Recovery of outputs after undervoltage condition is configurable by SPI:

–

VS_LOCK_EN (CR 3) = 1: outputs are off until Read&Clear VS_UV (SR 2).

–

VS_LOCK_EN (CR 3) = 0: outputs turned on automatically after VS undervoltage

condition has recovered.



The undervoltage bit VS_UV (SR 2) is set and can be cleared with a ‘Read&Clear’

command. The undervoltage bit is removed automatically if VS_LOCK_EN (CR 3) = 0

and the undervoltage condition has recovered.

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