L99PM62GXP datasheet(31/102 Pages) STMICROELECTRONICS

31 / 102 page

L99PM62GXP

Detailed description

Doc ID 17639 Rev 4

31/102

In order to further reduce the current consumption in standby mode, the integrated CAN bus

interface offers an ultra low current consumption.

2.9.1

CAN error handling

The L99PM62GXP provides the following 4 error handling features which are not described

in the ISO 11898-2/ISO 11898-5, but are realized in different stand alone CAN

transceivers/micro controllers to switch the application back to normal operation mode.

At VS > Vpor (i.e. VS power-on reset threshold), the CAN transceiver is enabled. It remains

enabled also in case of VS overvoltage and undervoltage conditions.

The CAN transmitter is disabled only 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.

2.9.2

Wake up (from CAN)

When the L99PM62GXP is in standby mode with CAN wake up option enabled, the CAN

bus traffic is detected. For the wake up feature the L99PM62GXP logic differentiates

different conditions. During V1 Standby mode RXDC output is kept at recessive level.

Independent from the wakeup pattern selected and independent from the previous Standby

mode, the RXDC reflect immediately the bus state after the wakeup. This feature allows

implementation of a ‘partial networking’ functionality controlled by the system

microcontroller.

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