SPSB0813 datasheet(33/135 Pages) STMICROELECTRONICS

33 / 135 page

Figure 21. CAN wake up capabilities

Note:

The figures above illustrate the wake-up behavior from V1_standby mode. For wake-up from VBAT_standby

mode the NRESET signal (with 2 ms timing) is generated instead of the RXD_L(Interrupt) signal.

3.12.6

CAN receive only mode

During TRX normal mode, with the CAN _REC_ONLY bit in CR1 it is possible to disable the CAN transmitter. In

this mode it is possible to listen to the bus but not to send to it. The receiver termination network is still activated

in this mode.

3.12.7

CAN looping mode

If the CAN_LOOP_EN (configuration register) is set, the TxD_C input is mapped directly to the RxD_C pin. This

mode can be used in combination with the CAN receive-only mode, to run diagnosis for the CAN protocol handler

of the microcontroller.

Note:

To guarantee the correct behavior of the CAN_FD transceiver and to get its optimized electrical performances,

the VCANSUP pin must be connected to V1, V2, or Vext pin (see Table 6. Voltage regulators configuration).

3.13

Power supply fail

3.13.1

Vs supply failure

Vs overvoltage

If the supply voltage Vs reaches the over voltage threshold VSOV:

•

LIN remains enabled

•

CAN remains enabled

•

OUT1, OUT2, OUT3, and OUT4 are turned off (default).

The shutdown of outputs may be disabled by SPI (VS_OV_SD_EN (CR3) =0)

•

Recovery of outputs after over-voltage condition is configurable by SPI:

–

VS_LOCK_EN (CR3) = 1: Outputs are off until Read&Clear VS_OV (SR2).

–

VS_ LOCK_EN (CR3) = 0: Outputs turned on automatically after Vs over-voltage condition has

recovered.

SPSB081

Power supply fail

DS14048 - Rev 1

page 33/135

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