TLE9255WLC datasheet(34/100 Pages) INFINEON

34 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

Fail Safe Functions

6.2.3

Long-term undervoltage detection on VCC

If VCC < VCC_UV for more than the glitch filter time tVCC_filter, then the undervoltage detection timer is started. If

tVCC_UV_T has expired, then a long-term undervoltage is detected and the bit VCC_LTUV is set to “1”. Besides, if

the SPI bit STTS_EN = 1 (default value) AND if tSilence has expired, then a state transition to Sleep WUP Sub-

Mode is triggered. If VCC > VCC_UV for more than the glitch filter time tVCC_filter, then the timer tVCC_UV_T is stopped

and reset. Only an SPI command can reset the undervoltage bit VCC_LTUV. The tVCC_UV_T can be configured in

the SPI register SUPPLY_CTRL.

Figure 28

VCC long-term undervoltage detection after power up

Figure 29

VCC long-term undervoltage detection during operation

6.2.4

Short-term Undervoltage detection on VIO

If the power supply VIO < VIO_UV for more than the glitch filter time tVIO_filter, then short-term undervoltage on VIO

is detected. The glitch filter prevents an undervoltage detection due to short voltage transients on VIO. On

detection of short-term undervoltage the TLE9255W performs the following actions:

VCC

VCC_UV

Status Bit:

VCC_LTUV

„1"

POR

Mode

(SPI Bit STTS = 1)

Stand-by Mode

tVCC_UV_T

„0"

VBAT is in the functional range

tVCC_filter

POR

Stand-by Mode

Sleep WUP Sub-Mode1

1) State transition will be performed if the tSilence timer has expired (no CAN bus communication)

VIO and VBAT are within the functional range

VCC

VCC_UV

Status Bit

VCC_LTUV:

tVCC_filter

„0"

„1"

tVCC_UV_T

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