33910 datasheet(75/90 Pages) FREESCALE

75 / 90 page

Analog Integrated Circuit Device Data

Freescale Semiconductor

33910

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

MC33910BAC / MC34910BAC

LIN PHYSICAL LAYER

The LIN bus pin provides a physical layer for single-wire

communication in automotive applications. The LIN physical

layer is designed to meet the LIN physical layer specification

and has the following features:

• LIN physical layer 2.0 compliant

• Slew rate selection

• Over-current shutdown

• Over-temperature shutdown

• LIN pull-up disable in Stop and Sleep modes

• Advanced diagnostics

• LIN dominant voltage level selection

The LIN driver is a low side MOSFET with over-current

and thermal shutdown. An internal pull-up resistor with a

serial diode structure is integrated, so no external pull-up

components are required for the application in a Slave mode.

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.

Figure 39. 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.

LIN Pull-up Disable In Stop and Sleep Mode

To improve performance and for safe behavior in case of

LIN bus short to ground or LIN bus leakage during Low Power

mode the internal pull-up resistor on the LIN pin can be

disconnected by clearing the LINPE bit in the MCR. The bit

LINPE also changes the bus wake-up threshold (VBUSWU).

In case of a LIN bus short to GND, this feature will reduce

the current consumption in Stop and Sleep modes.

High-voltage

High Side

RXONLY

MOD1:2

LSR0:1

LINPE

LDVS

INTERRUPT

CONTROL

MODULE

LIN – DRIVER

Slope and Slew Rate Control

Over-current Shutdown (interrupt maskable)

Over-temperature Shutdown (interrupt maskable)

VS1

WAKE-UP

RXSHORT

LINOC

TXDOM

LINOT

LIN

FILTER

SLOPE

CONTROL

30K

LGND

LIN

RECEIVER

TXD

RXD

Interrupt

Shutdown

Wake-up

WAKE-UP

MODULE

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