33911 datasheet(31/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

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 LINM bit 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. If an over-temperature condition

occurs, the transmitter will be shut down and the LINOT bit in

the LINSR is set.

If the LINM bit is set in the 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 LINSR with the TXD pin high 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 a short-circuit condition, either 5V

or Ground, the RXSHORT bit in the LINSR is set and the

transmitter is shutdown.

If the LINM bit is set in the 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 LINSR without the RXD pin short-circuit

condition will clear the RXSHORT bit.

TXD Dominant Detection (LIN Interrupt)

The LIN transceiver monitors the TXD input pin to detect

stuck-in-dominant (0V) condition. If a stuck condition occurs

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

shut down and the TXDOM bit in the LINSR is set.

If the bit LINM is set in the IMR an Interrupt IRQ will be

generated.

The transmitter is automatically re-enabled once TXD is

high.

A read of the 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

LDVS bit in the LIN Control Register (LINCR).

LIN Receiver Operation Only

While in Normal Mode, the activation of the RXONLY bit

disables the LIN TXD driver. If a LIN error condition occurs,

this bit is automatically set. Ifa 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. If the LIN-PU bit 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 Interrupt Source Register (ISR). Also see Figure 11,

page 18.

SLEEP Mode And Wake-Up Feature

During Sleep Mode operation, the transmitter of the

physical layer is disabled. If the LIN-PU bit 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 must still active 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.

33911 Datasheet(PDF) 31 Page - Freescale Semiconductor, Inc

33911 Datasheet(HTML) 31 Page - Freescale Semiconductor, Inc

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