Analog Integrated Circuit Device Data



Freescale Semiconductor

25

33663

FUNCTIONAL DESCRIPTION

INTRODUCTION

FUNCTIONAL DESCRIPTION

INTRODUCTION

The 33663L and 33663J are both a Physical Layer component dedicated to automotive LIN sub-bus applications.

The 33663L features include a 20 kbps baud rate and the 33663J a 10 kbps baud rate. Both integrate fast baud rate for test

and programming modes, excellent ESD robustness, immunity against disturbance, and radiated emission performance. They

have safe behavior, in case of a LIN bus short-to-ground, or a LIN bus leakage during low power mode.

Digital inputs are 5.0 and 3.3 V compatible without any external required components.

The INH1 and INH2 outputs may be used to control an external voltage regulator, or to drive a LIN bus pull-up resistor.

FUNCTIONAL PIN DESCRIPTION

POWER SUPPLY PIN (VSUP)

The VSUP supply pin is the power supply pin for the 33663L or 33663J. In an application, the pin is connected to a battery

through a serial diode, for reverse battery protection. The DC operating voltage is from 7.0 to 18 V. This pin sustains standard

automotive condition, such as 40 V during load dump. To avoid a false bus message, an under-voltage on VSUP disables the

LIN Module.

GROUND PIN (GND)

In case of a ground disconnection at the module level, the 33663L and 33663J do not have significant current consumption

on the LIN bus pin when in the recessive state.

LIN BUS PIN (LIN1, LIN2)

The LIN1 and LIN2 pins represent the single-wire bus transmitter and receiver. It is suited for automotive bus systems, and is

compliant to the LIN bus specification 1.3, 2.0, 2.1, and SAEJ2602-2.

The LIN interface is only active during Normal mode.

Transmitter Characteristics

The LIN driver is a low side MOSFET with internal over-current 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. An additional

pull-up resistor of 1.0 k

 must be added when the interface is used in the master node.

The 33663 is tested according to the application conditions (i.e. in normal mode and recessive state during communication).

The transmitter has a 20 kbps baud rate (Normal baud rate) for the 33663L and 33663S devices, or 10 kbps baud rate (Slow

baud rate) for the 33663J device.

TXD

RXD

35µA

LIN Driver

LIN

VSUP

EN_sleep

INH_ON

Slope Control

Receiver



725 k

30 k



INH

LIN Undervoltage

LIN overtemperature

TXD Dominant

LIN Wake up

EN

X 1

INH overtemperature

INH switched off &

LIN transmitter and receiver disabled

OR