TLE9263QX datasheet(67/164 Pages) INFINEON

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Data Sheet

Rev. 1.1, 2014-09-26

TLE9263QX

High Speed CAN Transceiver

Rearming the Transceiver for Wake Capability

After a BUS wake-up event, the transceiver is woken. However, the CAN transceiver mode bits will still show wake

capable (=‘01’) so that the RXD signal will be pulled low. There are two possibilities how the CAN transceiver’s

wake capable mode is enabled again after a wake event:

•

The CAN transceiver mode must be toggled, i.e. switched from Wake Capable Mode to CAN Normal Mode,

CAN Receive Only Mode or CAN Off, before switching to CAN Wake Capable Mode again.

•

Rearming is done automatically when the SBC is changed to SBC Stop, SBC Sleep, or SBC Fail-Safe Mode

to ensure wake-up capability.

Note: It is not necessary to clear the CAN wake-up bit CAN_WU to become wake capable again. It is sufficient to

toggle the CAN mode.

Note: The CAN module is supplied by an internal voltage when in CAN Wake Capable Mode, i.e. the module must

not be supplied through the VCAN pin during this time. Before changing the CAN Mode to Normal Mode, the

supply of VCAN has to be activated first.

Wake-Up in SBC Stop and Normal Mode

In SBC Stop Mode, if a wake-up is detected, it is always signaled by the INT output and in the WK_STAT_1 SPI

microcontroller should set the device from SBC Stop Mode to SBC Normal Mode, there is no automatic transition

to Normal Mode.

For functional safety reasons, the watchdog will be automatically enabled in SBC Stop Mode after a Bus wake

event in case it was disabled before (if bit WD_EN_ WK_BUS was configured to HIGH before).

Wake-Up in SBC Sleep Mode

Wake-up is possible via a CAN message (filter time t > tWake1). The wake-up automatically transfers the SBC into

the SBC Restart Mode and from there to Normal Mode the corresponding RXD pin in set to LOW. The

microcontroller is able to detect the low signal on RXD and to read the wake source out of the WK_STAT_1

example switch the CAN transceiver into CAN Normal Mode via SPI to start communication.

Table 16

Action due to CAN Bus Wake-Up

SBC Mode

SBC Mode after Wake

VCC1

INT

RXD

Normal Mode

LOW

Stop Mode

LOW

Sleep Mode

Restart Mode

Ramping Up

HIGH

LOW

Restart Mode

HIGH

LOW

Fail-Safe Mode

Restart Mode

Ramping up

HIGH

LOW

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