TLE8261E datasheet(43/82 Pages) INFINEON

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Data Sheet

Rev. 1.0, 2009-03-31

TLE8261E

Supervision Functions

10.1

Reset Function

10.1.1

Description

The reset output pin RO provides information to the microcontroller, for example, in the event that the output

voltage has fallen below the undervoltage threshold

RT1/2/3. When connecting the SBC to battery voltage, the

reset signal remains LOW initially. When the output voltage

cc1µC has reached the reset threshold VRT1,r, the reset

output RO remains LOW for the reset delay time

rd1. After that the RO is released to HIGH. A reset can also occur

due to faulty Watchdog refresh.See Chapter 10.2. The reset threshold as well as the reset delay time can be

adjusted via SPI. The RO pin has an integrated pull-up resistor.

10.1.2

Reset diagnosis

The RO pin is diagnosed for both short circuit to

ccx and GND. Depending on the configuration, in case of RO

failure, the SBC goes to SBC Fail-Safe or Restart Mode and activate the Limp Home output.

In case of short circuit to GND, it is detected in any SBC mode except SBC Restart Mode. At the falling edge of

the RO, when supposed to be HIGH, the SBC enters automatically the SBC Restart Mode. If after the

rd and RO

relaxation, the RO pin is still LOW, then the SBC detects the clamping to LOW failure. The microcontroller is in

permanent reset.

In case of short circuit to

ccx, the SBC cannot detect the short circuit before a reset should occur. So reset

clamped is detected when the SBC goes to SBC Restart Mode or during Init Mode.

10.1.3

Reset Timing

Figure 18

Reset Timing Diagram

RD1

SBC Init

SPI

RTx

undervoltage

RDx

SBC Normal

t < t

SBC Restart

SBC Normal

SPI

Init

Res_per_8264.vsd

Trigger

SPI

Init

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