TLE9263QX datasheet(101/164 Pages) INFINEON

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Data Sheet

101

Rev. 1.1, 2014-09-26

TLE9263QX

Supervision Functions

15.2

Watchdog Function

The watchdog is used to monitor the software execution of the microcontroller and to trigger a reset if the

microcontroller stops serving the watchdog due to a lock up in the software.

Two different types of watchdog functions are implemented and can be selected via the bit WD_WIN:

•

Time-Out Watchdog (default value)

•

Window Watchdog

The respective watchdog functions can be selected and programmed in SBC Normal Mode. The configuration

stays unchanged in SBC Stop Mode.

Please refer to Table 26 to match the SBC Modes with the respective watchdog modes.

The watchdog timing is programmed via SPI command. As soon as the watchdog is programmed, the timer starts

with the new setting and the watchdog must be served. The watchdog is triggered by sending a valid SPI-write

command to the watchdog configuration register. The trigger SPI command is executed when the Chip Select

input (CSN) becomes HIGH.

When coming from SBC Init, SBC Restart Mode or in certain cases from SBC Stop Mode, the watchdog timer is

always started with a long open window. The long open window (tLW = 200ms) allows the microcontroller to run its

initialization sequences and then to trigger the watchdog via SPI.

The watchdog timer period can be selected via the watchdog timing bit field (WD_TIMER) and is in the range of

10 ms to 1000 ms. This setting is valid for both watchdog types.

The following watchdog timer periods are available:

•

WD Setting 1: 10ms

•

WD Setting 2: 20ms

•

WD Setting 3: 50ms

•

WD Setting 4: 100ms

•

WD Setting 5: 200ms

•

WD Setting 6: 500ms

•

WD Setting 7: 1000ms

In case of a watchdog reset, SBC Restart or SBC Fail-Safe Mode is entered according to the configuration and

the SPI bits WD_FAIL are set. Once the RO goes HIGH again the watchdog immediately starts with a long open

window the SBC enters automatically SBC Normal Mode.

In SBC Software Development Mode the watchdog is OFF and therefore no reset and interrupt are generated due

to a watchdog failure.

Table 26

Watchdog Functionality by SBC Modes

SBC Mode

Watchdog Mode

Remarks

INIT Mode

Starts with Long Open Window Watchdog starts with Long Open Window after RO is

released

Normal Mode

WD Programmable

Window Watchdog, Time-Out watchdog or switched

OFF for SBC Stop Mode

Stop Mode

Watchdog is fixed or OFF

Sleep Mode

OFF

SBC will start with Long Open Window when entering

SBC Normal Mode.

Restart Mode

OFF

SBC will start with Long Open Window when entering

SBC Normal Mode.

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