33910 datasheet(35/90 Pages) FREESCALE

35 / 90 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

MC33910G5AC/MC3433910G5AC

required for the application in a slave node. The fall time from

dominant to recessive and the rise time from recessive to

dominant is controlled. The symmetry between both slopes is

guaranteed.

LIN Pin

The LIN pin offers a high susceptibility immunity level from

external disturbance, guaranteeing communication during

external disturbance.

Figure 18. LIN Interface

Slew Rate Selection

The slew rate can be selected for optimized operation at

10.4 and 20 kBit/s as well as a fast baud rate for test and

programming. The slew rate can be adapted with the bits

LSR1:0 in the LIN Control Register (LINCR). The initial slew

rate is optimized for 20 kBit/s.

J2602 Conformance

To be compliant with the SAE J2602-2 specification, the

J2602 feature has to be enabled in the LINCR Register (bit

DIS_J2602 sets to 0). The LIN transmitter is disabled in case

of a VSUP under-voltage condition occurs and TXD is in

Recessive State: the LIN bus goes in Recessive State and

RXD goes high. The LIN transmitter is not disabled if TXD is

in Dominant State. A deglitcher on VSUP (tJ2602_DEG) is

implemented to avoid false switching.

If the (DIS_J2602) bit is set to 1, the J2602 feature is

disabled and the communication TXD-LIN-RXD works for

VSUP down to 4.6 V (typical value) and then the

communication is interrupted.

The (DIS_J2602) bit is set per default to 0.

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 LINOT bit

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.

The transmitter is automatically re-enabled once the

condition is gone and TXD is high.

RXD Short-circuit Detection (LIN Interrupt)

The LIN transceiver has a short-circuit detection for the

RXD output pin. If the device transmits and in case of a short-

circuit condition, either 5.0 V or Ground, the RXSHORT bit in

RXONLY

MOD1:2

LSR0:1

J2602

LIN DRIVER

Slope and Slew Rate Control

Over-temperature Shutdown (interrupt maskable)

VS1

WAKE-UP

RXSHORT

TXDOM

LINOT

LIN

FILTER

SLOPE

CONTROL

30 K

LGND

LIN

RECEIVER

TXD

RXD

Wake-up

WAKE-UP

MODULE

33910 Datasheet(PDF) 35 Page - Freescale Semiconductor, Inc

33910 Datasheet(HTML) 35 Page - Freescale Semiconductor, Inc

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