TLE9252V datasheet(25/50 Pages) INFINEON

25 / 50 page

Data Sheet

Rev. 1.01

2018-01-09

TLE9252V

High-Speed CAN FD Transceiver

Fail safe functions

6.1

Short Circuit Protection

The CANH and CANL bus pins are proven to withstand a short circuit fault against GND and against the supply

voltages. A current limiting circuit protects the transceiver against damages.

6.2

Undervoltage detection

The TLE9252V has three independent undervoltage detections: VBAT, VCC and VIO. Undervoltage events may

have impact on the functionality of the device and also may change the mode of operation (see Chapter 5).

6.2.1

Undervoltage and power-down detection on VBAT

The power-down is detected if the power supply VBAT is below VBAT_POD for more than the glitch filter time

tVBAT_filter. This glitch filter is implemented in order to prevent an undervoltage detection due to short voltage

transients on VBAT. In case of an power-down detection on VBAT the TLE9252V is switched off (Power On Reset).

If VBAT recovers (VBAT > VBAT_UV) the TLE9252V enters by default Stand-by Mode. If VBAT > VBAT_POD the INH output

pin is connected to VBAT. Figure 20 shows the undervoltage scenario.

Figure 20 VBAT power-down undervoltage detection (VCC not available)

If an undervoltage is detected VBAT < VBAT_UV for t > tVBAT_filter the Local Wake-Up function is disabled (Figure 21).

Figure 21 VBAT undervoltage detection

VBAT

Any Mode

VBAT_POD

tVBAT_filter

Mode

tVBAT_filter

Stand-by Mode 1)

tPON

Power On Reset

1) Assuming EN = NSTB = „0"

VCC = 0V

VBAT_UV

VBAT

Enabled

VBAT_UV

tVBAT_filter

Local

Wake

Evaluation

tVBAT_filter

Disabled

In Stand-by Mode, Go-to-Sleep Mode and Sleep Mode

Enabled

VBAT_POD

tVBAT_Recovery

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