33911 datasheet(30/45 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

33911

FUNCTIONAL DEVICE OPERATIONS

OPERATIONAL MODES

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 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.

Figure 19. LIN Interface

Slew Rate Selection

The slew rate can be selected for optimized operation at

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

programming. The slew rate can be adapted with the LSR1:0

bits in the LIN Control Register (LINCR). The initial slew rate

is optimized for 20kBit/s.

LIN Pull-up Disable In Stop And Sleep Modes

In case of a LIN bus short to GND 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

Mode Control Register (MCR). The bit LINPE also changes

the Bus wake-up threshold (VBUSWU).

This feature will reduce the current consumption in STOP

and SLEEP Modes. It also improves performance and safe

operation.

Current Limit (LIN Interrupt)

The output low side FET is protected against over-current

conditions. If an over-current condition occurs (e.g. LIN bus

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

33911 Datasheet(PDF) 30 Page - Freescale Semiconductor, Inc

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