L99DZ320 datasheet(63/146 Pages) STMICROELECTRONICS

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1. The functionality is not guaranteed in the range Vpor < VS < VSUV.

3.12.2

VSREG supply failure

VSREG overvoltage

If the supply voltages VSREG reaches the overvoltage threshold VSREG_OV:

•

LIN is switched to high impedance (RX is still on)

•

CAN remains enabled

•

HS15 and HS0 are turned off (default).

•

The shutdown of outputs may be disabled by SPI (VSREG_OV_SD_EN (CR16) = 0)

•

Recovery of outputs after overvoltage condition is configurable by SPI:

–

VSREG_LOCK_EN (CR16) = 1: outputs are off until Read&Clear VSREG_ OV (SR7)

–

VSREG_LOCK_EN (CR16) = 0: outputs turned on automatically after VSREG overvoltage condition

has recovered

•

The overvoltage bit VSREG_OV (SR7) is set and can be cleared with a ‘Read&Clear’ command. The

overvoltage bit is reset automatically if VSREG_ LOCK_EN (CR16) = 0 and the overvoltage condition has

recovered.

VSREG undervoltage

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

•

LIN is switched to high impedance (RX is still on(1))

•

CAN remains enabled(1)

•

HS15 and HS0 are turned off (default).

•

The shutdown of outputs may be disabled by SPI (VSREG_UV_SD_EN (CR16) = 0)(1)

•

ECV is switched in high impedance state and ECDR is discharged by RECDRDIS (to ensure the gate of the

external Power MOSFET is discharged => EC mode considered as off)

•

recovery of outputs after undervoltage condition is configurable by SPI:

–

VSREG_LOCK_EN = 1: outputs are off until Read&Clear VSREG_UV (SR7)

–

VSREG_LOCK_EN = 0: outputs turned on automatically after VSREG undervoltage condition has

recovered

•

The undervoltage bit (VSREG_UV (SR7) is set and can be cleared with a ‘Read&Clear’ command. The

undervoltage bit is removed automatically if VSREG_LOCK_EN (CR16) = 0 and the undervoltage condition

has recovered

1. The functionality is not guaranteed in the range Vpor < VS < VSUV.

L99DZ320

Functional description

DS14235 - Rev 5

page 63/146

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