TLE9255WLC datasheet(44/100 Pages) INFINEON

44 / 100 page

Data Sheet

Rev. 1.02 2018-02-02

TLE9255W

CAN Partial Networking

The following figure shows a selective wake configuration error.

Figure 40

Selective wake configuration Error

7.5

CAN Flexible Data Rate (CAN FD) Tolerant Feature

The CAN FD tolerant feature means that selective wake unit ignores CAN FD frames. Therefore it is not possible

to configure a CAN FD frame for wake-up frame (WUF) detection.

At the completion of a detected CAN FD frame, that is, the End of Frame (EOF) is detected, the selective wake

unit is ready for detecting the next available classical CAN frame. If at least 6 recessive bits and at most 10

recessive bits are received, then EOF detection is successful. The FDF Bit of the Control Field of a CAN FD frame

identifies the type of CAN frame:

• FDF bit = 1:

CAN FD frame recognized, decoding stops

• FDF bit = 0:

classical CAN frame recognized, processing of the frame continues

In this way it is possible to send mixed CAN frame formats without affecting the selective wake functionality

by error counter increment and a misleading wake-up. The CAN FD data phase baud rate must be configured

in the SPI field BR_RATIO of the register SWK_CTRL_2 to enable detection of CAN FD frames.

Set SWK wake data. e.g.

ID, ID_Mask, DATA

Power on Reset

SWK Unit is not enabled

Enable Selective Wake

(SWK_EN = 1)

Confirm SWK configuration

(CFG_VAL = 1)

Any mode

SWK Unit is enabled

Set Baudrate for the SWK

unit

Write operation to a SWK

configuration Register will

cause a selective wake

configuration error!

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