TLE9255WLC datasheet(23/100 Pages) INFINEON

23 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

Modes of Operation

5.5

Power On Reset

Power on Reset is a transition state of the TLE9255W after power is applied and the transceiver is not yet fully

functional.

• The transmitter and receiver are disabled.

• The bus biasing is off.

• The TxD timeout function is disabled.

• The overtemperature protection is disabled.

• The undervoltage detection on VBAT is enabled (Chapter 6.2.1), but it is not signalled in the SPI bit VBAT_UV.

• The undervoltage detection on VCC is disabled.

• The undervoltage detection on VIO is enabled (Chapter 6.2.4), but it is not signalled in the SPI bits VIO_LTUV

and VIO_STUV.

• The SPI communication is blocked (MOSI, SCLK, CSN),

• RxD and MISO pins are high impedance.

•TxD pin is blocked

•If VBAT > VBAT_POD OR VCC > VCC_POD, then the INH output pin is switched on

• All SPI registers are reset to default values.

• The HS CAN bus is not continuously monitored for a valid wake-up pattern (Chapter 5.7.1)

•The HS CAN bus is not monitored for a valid WUF (Chapter 5.7.2).

• Local wake-up function is disabled.

Conditions for entering the Power on Reset:

•VBAT <VBAT_POD AND VCC <VCC_POD threshold.

Conditions for leaving the Power on Reset:

•If VBAT is within the functional range for at least tPON OR if VCC is within the functional range for at least tPON,

then the TLE9255W enters Stand-by Mode

Figure 14 shows power up behavior and power down behavior:

Figure 14

Power down and power up behavior

SPI bit POR

The POR flag indicates that all registers are reset and the state machine is in the default mode (Stand-by Mode)

If all of the following conditions are fulfilled, then the POR flag is set:

•VBAT is within the functional range for at least tPON OR VCC is within the functional range for at least tPON, then

the TLE9255W enters Stand-by Mode

Power on Reset

Any Mode

VCC < VCC_POD

AND

VBAT < VBAT_POD

Stand-by Mode

VBAT OR VCC is in

the functional

range for at least

tPON

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