33910 datasheet(41/90 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DEVICE OPERATIONS

LOGIC COMMANDS AND REGISTERS

MC33910G5AC/MC3433910G5AC

LIN Control Register - LINCR

This register controls the LIN physical interface block.

Writing the LIN Control Register (LINCR) returns the LIN

Status Register (LINSR).

* LIN failure gone: if LIN failure (overtemp, TXD/RXD short) was set,

the flag resets automatically when the failure is gone.

J2602 - LIN Dominant Voltage Select

This write-only bit controls the J2602 circuitry. If the

circuitry is enabled (bit sets to 0), the TXD-LIN-RXD

communication works down to the battery under-voltage

condition is detected. Below, the bus is in recessive state. If

the circuitry is disabled (bit sets to 1), the communication

TXD-LIN-RXD works down to 4.6 V (typical value).

0 = Enabled J2602 feature.

1 = Disabled J2602 feature.

RXONLY - LIN Receiver Operation Only

This write-only bit controls the behavior of the LIN

transmitter.

In Normal mode, the activation of the RXONLY bit disables

the LIN transmitter. In case of a LIN error condition, this bit is

automatically set.

In Stop mode this bit disables the LIN wake-up

functionality, and the RXD pin will reflect the state of the LIN

bus.

1 = only LIN receiver active (Normal mode) or LIN wake-

up disabled (Stop mode).

0 = LIN fully enabled.

LSRx - LIN Slew-Rate

This write-only bit controls the LIN driver slew-rate in

accordance with Table 18.

LIN Status Register - LINSR

This register returns the status of the LIN physical

interface block and is also returned when writing to the

LINCR.

RXSHORT - RXD Pin Short-circuit

This read-only bit indicates a short-circuit condition on the

RXD pin (shorted either to 5.0 V or to Ground). The short-

circuit delay must be a worst case of 8.0 µs to be detected

and to shut down the driver. To clear this bit, it must be read

after the condition is gone (transition detected on RXD pin).

The LIN driver is automatically re-enabled once the condition

is gone and TXD is high.

1 = RXD short-circuit condition.

0 = None.

TXDOM - TXD Permanent Dominant

This read-only bit signals the detection of a TXD pin stuck

at dominant (Ground) condition and the resultant shutdown in

the LIN transmitter. This condition is detected after the TXD

pin remains in dominant state for more than 1 second (typical

value).

To clear this bit, it must be read after TXD has gone high.

The LIN driver is automatically re-enabled once TXD goes

High.

1 = TXD stuck at dominant fault detected.

0 = None.

LINOT - LIN Driver Over-temperature

This read-only bit signals that the LIN transceiver was

shutdown due to over-temperature. The transmitter is

automatically re-enabled after the over-temperature

condition is gone and TXD is high. The LINOT bit is cleared

after SPI read once the condition is gone.

1 = LIN over-temperature shutdown

0 = None

Table 16. LIN Control Register - $4

Write

DIS_J2602

RXONLY

LSR1

LSR0

Reset

Value

Reset

Condition

POR

POR, Reset

mode, ext_reset

or LIN failure

gone*

POR

Table 17. LIN Slew Rate Control

LSR1

LSR0

Description

Normal Slew Rate (up to 20 kb/s)

Slow Slew Rate (up to 10 kb/s)

Fast Slew Rate (up to 100 kb/s)

Reserved

Table 18. LIN Status Register - $4/$5

Read

RXSHORT

TXDOM

LINOT

33910 Datasheet(PDF) 41 Page - Freescale Semiconductor, Inc

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