SPSB081 datasheet(32/137 Pages) STMICROELECTRONICS

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Dominant TxD_C time out

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CAN permanent recessive

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RxD_C permanent recessive

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Thermal shutdown 1

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Can supply low

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

3.12.4.1

Dominant TXDC time out

If TXD_C is in a dominant state (low) for t > tDOM(TXDC) the transmitter is disabled, the status bit is latched and

can be read and optionally cleared by SPI (CAN_TXD_ DOM in SR2). The transmitter remains disabled until the

status register is cleared.

3.12.4.2

CAN bus permanent recessive

If TXD_C changes to dominant (low) state but CAN bus does not follow for four times, the transmitter is

disabled, the status bit is latched and can be read and optionally cleared by SPI (CAN_PERM_REC in SR2).

The transmitter remains disabled until the status register is cleared.

3.12.4.3

CAN Permanent dominant

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

latched and can be read and optionally cleared by SPI (CAN_PERM_DOM in SR2). The transmitter will not be

disabled.

3.12.4.4

RXDC permanent recessive

If RXD_C pin is clamped to a 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

RXD_C does not follow TXD_C for four times the transmitter is disabled. The status bit is latched and can be read

and optionally cleared by SPI (CAN_RXD_REC in SR2). The transmitter remains disabled until the status register

is cleared.

3.12.5

Wake-up by CAN

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), the device can be woken-up by

sending two consecutive dominant bits separated by a recessive bit.

For any activity on the CAN, CAN pattern wake-up option is enabled and the CAN transceiver was set in standby

mode (CAN TRX STBY) while CAN bus was in recessive state or dominant state. In order to wake up the device,

the following criteria must be fulfilled:

•

The CAN interface wake-up receiver must receive a series of two consecutive valid dominant pulses, each

of which must be longer than tfilter.

•

The distance between two pulses must be longer than tFILTER.

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The two pulses must occur within a time frame of tWAKE.

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Wake-up occurs when the duration of a second pulse becomes longer than tFILTER.

Note:

A wake-up caused by a message on the bus starts the voltage regulator and the microcontroller to switch the

application back to normal operation mode.

SPSB081

CAN FD bus transceiver

DS14048 - Rev 3

page 32/137

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