L99DZ200G datasheet(94/198 Pages) STMICROELECTRONICS

94 / 198 page

Application information

L99DZ200G

94/198

DS13220 Rev 5

Vs undervoltage

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



LIN remains enabled



CAN 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)



H-bridge drivers A and B are turned off (default). The shutdown of H-bridge drivers may

be disabled by SPI (VS_UV_SD_EN (CR 3) = 0)



Heater MOSFET gate driver is switched into sink condition



ECV is switched in high impedance state and ECDR is discharged by RECDRDIS (to

ensure the gate of the external MOSFET is discharged => EC mode considered as off)



Recovery of outputs and H-bridge drivers after undervoltage condition is configurable by

SPI:

–

VS_LOCK_EN (CR 3) = 1: outputs and H-bridge drivers are off until Read&Clear

VS_UV (SR 2).

–

VS_LOCK_EN (CR 3) = 0: outputs and H-bridge drivers 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.

4.12.2

Vsreg supply failure

Vsreg Overvoltage

If the supply voltages VSREG reaches the overvoltage threshold VSREG_OV:



LIN transmitter is switched to high impedance



CAN remains enabled



OUT15 is turned off (default).

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



Recovery of outputs after overvoltage condition is configurable by SPI:

–

VSREG_LOCK_EN (CR 3) = 1: outputs are off until Read&Clear VSREG_OV (SR

2).

–

VSREG_LOCK_EN (CR 3) = 0: outputs turned on automatically after VSREG

overvoltage condition has recovered.



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

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

and the overvoltage condition has recovered.

Vsreg Undervoltage

If the supply voltage VSREG drops below the under voltage threshold voltage (VSREG_UV):



LIN transmitter is switched to high impedance



CAN remains enabled



OUT15 is turned off (default).

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