TLE9461ES datasheet(56/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

High-Speed CAN FD Transceiver

Datasheet

Rev.1.1

2019-09-27

8.2.3

CAN Receive Only Mode

In CAN Receive Only Mode (RX only), the driver stage is de-activated but reception is still operational. This

mode is accessible by an SPI command in SBC Normal Mode and in SBC Stop Mode.

Note:

The transceiver is still properly working in Receive Only mode even if VCAN is not available because

of an independent receiver supply.

8.2.4

CAN Wake Capable Mode

This mode can be used in SBC Stop, Sleep, Restart and Normal Mode by programming via SPI and it is used to

monitor bus activities. It is automatically accessed in SBC Fail-Safe Mode. A wake-up signal on the bus results

in a change of behavior of the SBC, as described in Table 17. As a signalization to the microcontroller, the

RXDCAN pin is set Low and stays Low until the CAN transceiver is changed to any other mode. After a wake-up

event, the transceiver can be switched to CAN Normal Mode via SPI for bus communication.

As shown in Figure 22, a wake-up pattern (WUP) is signalled on the bus by two consecutive dominant bus

levels for at least tWake1 (wake-up time) and less than tWake2, each separated by a recessive bus level of greater

than tWake1 and shorter than tWake2.

Figure 22 CAN Wake-up Pattern Detection according to the Definition in ISO 11898-2

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 RXDCAN signal is pulled Low. There are two possibilities how the CAN

transceiver’s Wake Capable mode is enabled again after a wake-up 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.

Ini

Bias off

Bias on

Wait

Bias off

Bus recessive > tWAKE1

Bus dominant > tWAKE1

optional:

tWAKE2 expired

Bus recessive > tWAKE1

Bus dominant > tWAKE1

optional:

tWAKE2 expired

Entering CAN Normal

or CAN Recive Only

Entering CAN wake

capable

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