SPSB0813 datasheet(28/135 Pages) STMICROELECTRONICS

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3.11.2

Error handling

The device LIN transceiver provides the following three error handling features.

3.11.2.1

Dominant TxD_L time out

If TXD_L is in dominant state (low) for t > tdom(TXDL) the transmitter is disabled, the related status bit

LIN_TXD_DOM (SR2) is set.

The transmitter remains disabled until the status bit is cleared.

The TxD dominant timeout detection can be disabled via SPI (LIN_TXD_TOUT_EN =0).

3.11.2.2

Permanent recessive

If TXD_L changes to dominant (low) state but RXD_L signal does not follow within t < tLIN the transmitter is

disabled, the status bit LIN_PERM_REC (SR2) is set.

The transmitter remains disabled until the status bit is cleared.

3.11.2.3

Permanent dominant

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

LIN_PERM_DOM (SR2) is set.

The transmitter is not disabled.

3.11.3

Wake-up from standby modes

In low power modes (V1_standby mode and VBAT_standby mode) the SPSB081 can receive two types of

wake-up signals from the LIN bus (configurable by SPI bit LIN_WU_config):

•

Recessive-Dominant-Recessive pattern with t > tdom_LIN (default, according to LIN 2.2a)

A dominant time of at least 150us must be identified as a wake-up. Shorter dominant times may wake up the

device.

•

State change recessive-to-dominant or dominant-to-recessive (according to LIN 2.1)

Note:

Dominant levels having duration less than a glitch filter time (it is defined 28 µs minimum, according to OEM

requirements version 1.3) have to be filtered and therefore they cannot wake up the device.

3.11.3.1

Pattern wake-up (default)

Figure 18. Wake-up behavior according to LIN 2.2a

3.11.3.2

Status change wake-up - Recessive-to-dominant

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 device to active mode.

SPSB081

LIN bus interfaces (only for SPSB0815 and SPSB0813)

DS14048 - Rev 1

page 28/135

SPSB0813 Datasheet(PDF) 28 Page - STMicroelectronics

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