MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

© Motorola, Inc. 2003

33990 Simplified Application Diagram

Document order number: MC33990/D

Rev 1.0, 2/2003

33990

Advance Information

Enhanced Class B Serial

Transceiver

The 33990 is a serial transceiver designed to provide bi-directional half-

duplex communication meeting the automotive SAE Standard J-1850 Class B

Data Communication Network Interface specification. It is designed to

interface directly to on-board vehicle microcontrollers and serves to transmit

and receive data on a single-wire bus at data rates of 10.4 kbps using Variable

Pulse Width Modulation (VPWM). The 33990 operates directly from a vehicle's

12 V battery system and functions in a logic fashion as an I/O interface

between the microcontroller's 5.0 V CMOS logic level swings and the required

0 V to 7.0 V waveshaped signal swings of the bus. The bus output driver is

short circuit current limited.

Features

• Designed for SAE J-1850 Class B Data Rates

• Full Operational Bus Dynamics Over a Supply Voltage of 9.0 V to 16 V

• Ambient Operating Temperature of -40

°C to 125°C

• Interfaces Directly to Standard 5.0 V CMOS Microcontroller

• BUS Pin Protected Against Shorts to Battery and Ground

• Thermal Shutdown with Hysteresis

• Voltage Waveshaping of Bus Output Driver

• Internally Reverse Battery Protected

J-1850 SERIAL TRANSCEIVER

ORDERING INFORMATION

Device

Temperature

Package

MC33990D/DR2

-40 to 125°C

8 SOICN

D SUFFIX

PLASTIC PACKAGE

CASE 751

(8-LEAD SOICN)

33990

BUS

SLEEP

Tx

Rx

4X/LOOP

GND

LOAD

Primary

Node

MCU

Secondary

Nodes

10.6 k

Ω

470 pF

47 µH

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com