Document Number: MC33790

Rev 11.0, 3/2008

Freescale Semiconductor

Advance Information

* This document contains certain information on a new product.

Specifications and information herein are subject to change without notice.

© Freescale Semiconductor, Inc., 2006. All rights reserved.

Two-Channel Distributed

System Interface (DSI) Physical

Interface Device

The 33790 is a dual channel physical layer interface IC for the

Distributed System Interface (DSI) bus. It is designed to meet

automotive requirements. It can also be used in non automotive

applications. It supports bidirectional communication between slave

and master ICs. Some slave devices derive a regulated 5.0 V from

the bus, which can be used to power sensors, thereby eliminating the

need for additional circuitry and wiring.

Features

• Two Independent DSI Compatible Buses

• Pinout Matched to MC68HC55 (SPI to DSI Logic)

• Wave-Shaped Bus Output Voltage

• Independent Thermal Shutdown and Current Limit

• Return Signalling Current Detection

• Internal Logic Input Pull ups and Pull downs

• On-Board Charge Pump

•2.0 kV ESD Capability

• Communications Rate Up to 150 kbps

• Pb-Free Packaging Designated by Suffix Code EG

Figure 1. 33790 Simplified Application Diagram

DISTRIBUTED SYSTEM INTERFACE (DSI)

DW SUFFIX

EG SUFFIX (PB-FREE)

98ASB42567B

16-PIN SOICW

33790

DSI0F

DSI0S

DSI0R

DSI1F

DSI1S

DSI1R

CPCAP

VDD

GND

DSI0O

VSUP

DSI1O

GND

MC68HC55

33790

+5.0 V

+25 V

BUS_IN

BUS_OUT

BUS_IN

BUS_OUT

33793

33793

33793

DSI

SLAVE

DEVICE

Protocol

Converter

MCU

ORDERING INFORMATION

Device

Temperature

Package

MC33790DW/R2

-40

°C to 85°C

16 SOICW

MCZ33790EG/R2