33910 datasheet(30/44 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

short to VBAT), the transmitter will not be shut down. The bit

LINOC in the LIN status register (LINSR) is set.

If the bit LINM is set in the interrupt mask register (IMR) an

Interrupt IRQ will be generated.

Over-Temperature Shutdown (LIN Interrupt)

The output low side FET is protected against over-

temperature conditions. In case of an over-temperature

condition, the transmitter will be shut down and the bit LINOT

in the LIN status register (LINSR) is set.

If the bit LINM is set in the interrupt mask register (IMR) an

Interrupt IRQ will be generated.

The transmitter is automatically re-enabled once the

condition is gone and TXD is high.

A read of the LIN status register (LINSR) with the TXD pin

will re-enable the transmitter.

RXD Short Circuit Detection (LIN Interrupt)

The LIN transceiver has a short-circuit detection for the

RXD output pin. In case of an short-circuit condition, either 5V

or ground, the bit RXSHORT in the LIN status register

(LINSR) is set and the transmitter is shutdown.

If the bit LINM is set in the interrupt mask register (IMR) an

interrupt IRQ will be generated.

The transmitter is automatically re-enabled once the

condition is gone (transition on RXD) and TXD is high.

A read of the LIN status register (LINSR) without the RXD

pin short circuit condition will clear the bit RXSHORT.

TXD Dominant Detection (LIN Interrupt)

The LIN transceiver monitors the TXD input pin to detect

stuck in dominant (0V) condition. In case of a stuck condition

(TXD pin 0V for more than 1 second (typ.)) the transmitter is

shut down and the bit TXDOM in the LIN status register

(LINSR) is set.

If the bit LINM is set in the interrupt mask register (IMR) an

interrupt IRQ will be generated.

The transmitter is automatically re-enabled once TXD is

high.

A read of the LIN status register (LINSR) with the TXD pin

is high will clear the bit TXDOM.

LIN Dominant Voltage Level Selection

The LIN dominant voltage level can be selected by the bit

LDVS in the LIN control register (LINCR).

LIN Receiver Operation Only

While in Normal Mode the activation of the RXONLY bit

disables the LIN TX driver. In the case of a LIN error condition

this bit is automatically set. In case a Low Power Mode is

selected with this bit set, the LIN wake-up functionality is

disabled, then, in Stop Mode, the RXD pin will reflect the state

of the LIN bus.

STOP Mode And Wake-up Feature

During Stop Mode operation the transmitter of the physical

layer is disabled. In case the bit LIN-PU was set in the Stop

Mode sequence the internal pull-up resistor is disconnected

from VSUP and a small current source keeps the LIN pin in

the recessive state. The receiver is still active and able to

detect wake-up events on the LIN bus line.

A dominant level longer than tPROPWL followed by a rising

edge will generate a wake-up interrupt and will be reported in

the ISR. Also see Figure 11, page 19.

SLEEP Mode And Wake-up Feature

During Sleep Mode operation the transmitter of the

physical layer is disabled. In case the bit LIN-PU was set in

the Sleep Mode sequence the internal pull-up resistor is

disconnected from VSUP and a small current source keeps

the LIN pin in recessive state. The receiver is still active to be

able to detect wake-up events on the LIN bus line.

A dominant level longer than tPROPWL followed by a rising

edge will generate a system wake-up (Reset) and will be

reported in the ISR. Also see Figure 10, page 18.

33910 Datasheet(PDF) 30 Page - Freescale Semiconductor, Inc

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