L99DZ120_V01 datasheet(73/161 Pages) STMICROELECTRONICS

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DS11567 Rev 5

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L99DZ120

Application information

160

Permanent dominant

If the bus state is dominant (low) for t > tdom(bus) a bus permanent dominant failure will be

detected. The status bit LIN_PERM_DOM (SR 2) will be set.

The transmitter will not be disabled.

4.9.3

Wake up from Standby modes

In low power modes (V1_standby mode and Vbat_standby mode) the devices can receive

two types of wake up signals from the LIN bus (configurable by SPI bit LIN_WU_CONFIG

(Config Reg)):



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



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

Pattern Wake-up (default)

Figure 30. Wake-up behavior according to LIN 2.2a

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 t > tLINBUS, will switch the devices

to Active mode.

Status change wake-up - Dominant-to-recessive

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

recessive level at LIN for t > tLINBUS, will switch the devices to Active mode.

4.9.4

Receive-only mode

The LIN transmitter can be disabled in Active mode by setting the bit LIN_REC_ONLY

(CR2). In this mode it is possible to listen to the bus but not sending to it.

L99DZ120 Datasheet(PDF) 73 Page - STMicroelectronics