TLE9461ES datasheet(57/140 Pages) INFINEON

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TLE9461ES

Lite CAN SBC Family

High-Speed CAN FD Transceiver

Datasheet

Rev.1.1

2019-09-27

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

to ensure wake-up capability.

Wake-Up in SBC Stop and Normal Mode:

In SBC Stop Mode, if a wake-up is detected, it is always signaled by the INTN output and in the WK_STAT_0 SPI

microcontroller needs to 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 is automatically enabled in SBC Stop Mode after a Bus wake-up

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. The wake-up automatically transfers the SBC into the SBC Restart

Mode and from there to Normal Mode the corresponding RXDCAN pin is set to Low. The microcontroller is able

to detect the Low signal on RXDCAN and to read the wake source out of the WK_STAT_0 register via SPI. No

interrupt is generated when coming out of Sleep Mode. The microcontroller can now for example switch the

CAN transceiver into CAN Normal Mode via SPI to start communication.

8.2.5

CAN Bus termination

In accordance with the CAN configuration, four types of bus terminations are allowed:

•CAN Normal Mode: VCAN/2 termination;

•CAN Receive Only Mode: VCAN/2 termination in case that VCAN is nominal supply;

when VCAN UV is detected, the termination is 2.5V;

•CAN Wake Capable: GND termination: after wake-up, the termination is 2.5V;

•CAN Off: no termination necessary (bus floating).

When entering CAN Wake Capable mode the termination is only connected to GND only after the t_silence

time has expired.

8.2.6

TXD Time-out Feature

If the TXDCAN signal is dominant for a time t > tTXDCAN_TO, in CAN Normal Mode, the TXDCAN time-out function

deactivates the transmission of the signal at the bus setting the TXDCAN pin to recessive. This is implemented

to prevent the bus from being blocked permanently due to an error. The transmitter is disabled and thus

switched to recessive state. The CAN SPI control bits (CAN on BUS_CTRL_0) remain unchanged and the failure

is stored in the SPI flag CAN_FAIL. The CAN transmitter stage is activated again after the dominant time-out

condition is removed and the transceiver is automatically switched back to CAN Normal Mode.

Table 17

Action due to CAN Bus Wake-Up

SBC Mode

SBC Mode after Wake-up

VCC1

INTN

RXDCAN

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

TLE9461ES Datasheet(PDF) 57 Page - Infineon Technologies AG

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