L99PM72PXP datasheet(38/128 Pages) STMICROELECTRONICS

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Detailed description

L99PM72PXP

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Doc ID 023553 Rev 3

The CAN transmitter is disabled automatically in case of the following errors:

●

Dominant TxDC time out

●

CAN permanent recessive

●

RxDC permanent recessive

●

Thermal shutdown 1

The CAN receiver is not disabled in case of any failure condition.

Dominant TxDC time out

If TXDC is in dominant state (low) for t > tdom(TxD) the transmitter is disabled, status bit is

latched and can be read and optionally cleared by SPI. The transmitter remains disabled

until the status register is cleared.

CAN permanent recessive

If TXDC changes to dominant (low) state but CAN bus does not follow for 4 times, the

transmitter is disabled, status bit is latched and can be read and optionally cleared by SPI.

The transmitter remains disabled until the status register is cleared.

CAN permanent dominant

If the bus state is dominant (low) for t > tCAN a permanent dominant status is detected. The

status bit is latched and can be read and optionally cleared by SPI. The transmitter is not

disabled.

RXDC permanent recessive

If RXDC pin is clamped to recessive (high) state, the controller is not able to recognize a bus

dominant state and could start messages at any time, which results in disturbing the overall

bus communication. Therefore, if RXDC does not follow TXDC for 4 times the transmitter is

disabled. The status bit is latched and can be read and optionally cleared by SPI. The

transmitter remains disabled until the status register is cleared.

2.9.4

Wake up by CAN

The L99PM72PXP supports 2 wakeup modes. The selective wakeup according to ISO

11898-6 or the wakeup by any bus activity according to ISO 11898-2/-5. The wake up

behavior can be configured by SPI (see Chapter 6: ST SPI).

Wake up by CAN pattern (WUP)

The default setting for the wake up behavior after power-on reset is the wake up by regular

communication on the CAN bus. When the CAN transceiver is in a Standby Mode (CAN

TRX_STBY or TRX_SLEEP) the device can be woken up by sending two consecutive

dominant bits separated by a recessive bit.

Normal pattern wake up can occur when CAN pattern wake up option is enabled and the

CAN transceiver was set in Standby Mode (CAN TRX_STBY or TRX_SLEEP) while CAN

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