MC33912_10 Datasheet, PDF(36/94 Page) Freescale Semiconductor, Inc – LIN System Basis Chip with DC Motor Pre-driver and Current Sense

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MC33912_10 Datasheet, PDF (36/94 Pages) Freescale Semiconductor, Inc – LIN System Basis Chip with DC Motor Pre-driver and Current Sense

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FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

MC33912G5AC / MC34912G5AC

LIN Pin

The LIN pin offers a high susceptibility immunity level from

external disturbance, guaranteeing communication during

external disturbance.

WAKE-UP

MODULE

LIN

Wake-up

MOD1:2

LSR0:1

J2602

RXONLY

RXSHORT

TXDOM

LINOT

VS1

LIN DRIVER

Slope and Slew Rate Control

Over-temperature Shutdown (interrupt maskable)

30 K

LIN

TXD

WAKE-UP

FILTER

SLOPE

CONTROL

LGND

RXD

RECEIVER

Figure 19. 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-

33912

Analog Integrated Circuit Device Data

Freescale Semiconductor

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