L99PM62XP datasheet(29/98 Pages) STMICROELECTRONICS

29 / 98 page

L99PM62XP

Description

Doc ID 16363 Rev 4

29/98

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

interface offers an ultra low current consumption.

Note:

Use of master pull-up switch is optional.

2.8.1

Error handling

The L99PM62XP provides the following 3 error handling features which are not described in

the LIN Spec. V2.1, but are realized in different stand alone LIN transceivers / micro

controllers to switch the application back to normal operation mode.

Dominant TxDL time out

If TXDL is in dominant state (low) for more than 12 ms (typ) 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. This feature can be disabled via SPI.

Permanent recessive

If TXDL changes to dominant (low) state but RXDL signal does not follow within 40 µs 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.

Permanent dominant

If the bus state is dominant (low) for more than 12 ms 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.

2.8.2

Wake up (from LIN)

In standby mode the L99PM62XP can receive a wake up from LIN bus. For the wake up

feature the L99PM62XP logic differentiates two different conditions.

Normal wake up

Normal wake up can occur when the LIN transceiver was set in standby mode while LIN

was in recessive (high) state. A dominant level at LIN for tlinbus, switches the L99PM62XP to

active mode.

Wake up from short to GND condition

If the LIN transceiver was set in standby mode while LIN was in dominant (low) state,

recessive level at LIN for tlinbus, switches the L99PM62XP to active mode.

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.

2.8.3

LIN pull-up

The master node pull-up resistor (1 k

Ω) can be connected to Vs using the internal LIN_PU

high-side switch. This high-side switch can be controlled by SPI in order to allow

disconnection of the pull-up resistor in case of LIN bus short to GND conditions.

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