TLE9461ES datasheet(87/140 Pages) INFINEON

87 / 140 page

TLE9461ES

Lite CAN SBC Family

Supervision Functions

Datasheet

Rev.1.1

2019-09-27

Figure 35 Watchdog disabling sequence in SBC Stop Mode

If a sequence error occurs, then the bit WD_STM_ EN_1 is cleared and the sequence has to be started again.

The watchdog can be enabled by triggering the watchdog in SBC Stop Mode or by switching back to SBC

Normal Mode via SPI command. In both cases the watchdog starts with a long open window and the bits

WD_STM_EN_1 and WD_STM_ EN_0 are cleared. After the long open window the watchdog has to be served

as configured in the WD_CTRL register.

Note:

The bit WD_STM_ EN_0 is cleared automatically when the sequence is started and it was ‘1’ before.

WD_STM_ EN_0 can also not be set if WD_STM_ EN_1 isn't yet set.

12.2.5

Watchdog Start in SBC Stop Mode due to Bus Wake

In SBC Stop Mode the Watchdog can be disabled. In addition a feature is available that starts the watchdog

with any Bus wake (CAN) during SBC Stop Mode. This feature is enabled by setting the bit WD_EN_ WK_BUS = 1

(= default value after POR). The bit can only be changed in SBC Normal Mode and needs to be programmed

before starting the watchdog disabling sequence.

A wake on CAN generates an interrupt and the RXD pin for CAN is pulled to Low. By these signals the

microcontroller is informed that the watchdog is startedwith a long open window. After the long open window

the watchdog has to be served as configured in the WD_CTRL register.

To disable the watchdog again, the SBC has to be switched to Normal Mode and the sequence has to be sent

again.

Correct WD disabling

sequence

Set bit

WD_STM_EN_1 = 1

Set bit

WD_STM_EN_0 = 1

with next WD Trigger

WD is switched off

Sequence Errors

• Missing to set bit

WD_STM_EN_0 with the

next watchdog trigger after

having set WD_STM_EN_1

• Staying in Normal Mode

instead of going to Stop

Mode with the next trigger

Change to

SBC Stop Mode

Before subsequent WD Trigger

Will enable the WD :

• Switching back to SBC

Normal Mode

• Triggering the watchdog

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