TLE9255WLC datasheet(35/100 Pages) INFINEON

35 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

Fail Safe Functions

• Set the short-term undervoltage bit VIO_STUV to “1” in the SPI register TRANS_UV_STAT. After the

completion of a Power on Reset, the VIO supply stabilization period must be completed before an

undervoltage notification can be recorded in the VIO_STUV bit. After Power on Reset the undervoltage

notification is only be possible once the VIO supply has exceeded the threshold VIO_UV, that is VIO > VIO_UV.

Figure 31 shows this scenario.

•set the RxD pin to “low”

• disable SPI communication by switching the MISO pin to high impedance

• TLE9255W ignores all signals on the input TxD pin

Only an SPI command can reset the undervoltage bit VIO_STUV. If VIO has recovered (VIO> VIO_UV) for more than

the glitch filter time tVIO_filter AND if the tVIO_recovery time has expired, then the RxD pin returns to normal

functionality depending on the mode of operation and the SPI communication is restored.

Figure 30

VIO short-term undervoltage detection

Any signal will be processed

VCC OR VBAT are within the functional range

VIO

„0"

VIO_UV

tVIO_filter

Status Bit

VIO_STUV:

tVIO_filter

RxD pin normal functional depending on mode of

operation

Logical „low“

„1"

RxD pin:

SPI Communicaiton

No SPI communication (High

impedance)

MISO:

tVIO_filter

SPI Communicaiton

RxD pin normal functional

depending on mode of operation

TxD pin:

Any signal will be ignored

Any signal will be processed

tVIO_recovery

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