TLE9461ES datasheet(82/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

Supervision Functions

Datasheet

Rev.1.1

2019-09-27

Supervision Functions

12.1

Reset Function

Figure 31 Reset Block Diagram

12.1.1

Reset Output Description

The reset output pin RSTN provides a reset information to the microcontroller, e.g. in the event that the output

voltage has fallen below the undervoltage threshold VRT1/2/3/4. In case of a reset event, the reset output RSTN

is pulled to Low after the filter time tRF and stays Low as long as the reset event is present and the configurable

reset delay time has not expired. The reset delay time can be configured. The default value is the extended

reset delay time tRD1 and the reduced reset delay time tRD2 can be selected by setting RSTN_DEL. When

connecting the SBC to battery voltage, the reset signal remains Low initially. When the output voltage Vcc1 has

reached the reset default threshold VRT1,r, the reset output RSTN is released to High after the reset delay time

tRD1. A reset can also occur due to a watchdog trigger failure. The reset threshold can be adjusted via SPI, the

default reset threshold is VRT1,f. The RSTN pin has an integrated pull-up resistor. In case reset is triggered, it is

pulled Low for Vcc1 ≥ 1V and for VS ≥ VPOR,f (see also Chapter 12.3).

The timings for the RSTN triggering regarding VCC1 undervoltage and watchdog trigger is shown in Figure 32.

Reset logic

Incl. filter & delay

RSTN

VCC1

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