Document Number: MC33793

Rev 13.0, 11/2006

Freescale Semiconductor

Technical Data

Freescale Semiconductor, Inc. reserves the right to change the detail specifications, as

may be required, to permit improvements in the design of its products.

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

Distributed System Interface

(DSI) Sensor Interface

The 33793 is a slave Distributed System Interface (DSI) device

that is optimized as a sensor interface. The device contains circuits

to power sensors such as accelerometers and to digitize the analog

level from the sensor. The device is controlled by commands over the

DSI bus and returns measured data over the bus.

Features

• Conforms to DSI Specification Version 1

• 4-Channel, 8-Bit Analog-to-Digital Converter (ADC)

• 4 Pins Configurable as Analog or Logic Inputs or as Logic

Outputs

• Provides Regulated +5.0 V Output for Sensor Power from Bus

• Additional High-Drive Logic Output

• Undervoltage Fault Detection and Signaling

• On-Board Clock (No External Elements Required)

• Field-Programmable Address

• Default and Field-Programmable as a DSI Daisy Chain Device

• Recognizes Reverse Initialization for Open Bus Fault Tolerance

• Detects Short to Battery on Bus Switch and Prevents Its Closure

• Pb-Free Packaging Designated by Suffix Code EF

Figure 1. 33793 Simplified Application Diagram

33793/A

ORDERING INFORMATION

Device

Temperature

Package

MC33793D/R2

-40°C to 150°C

16 SOICN

MCZ33793EF/R2

MCZ33793AEF/R2

SCALE 2:1

DISTRIBUTED SYSTEM INTERFACE

D SUFFIX

EF SUFFIX (Pb-FREE)

98ASB42566B

16-PIN SOICN

BusIN

33793

DSIO

33790

GND

Error

Test

X

Y

VCC

GND

X-Y

Accelerometer

BUSIN

I/O0

I/O1

I/O2

H_Cap

REGOUT

AGND

LOGOUT

BUSRTN

BUSOUT

I/O3

33793

Multiple

DSI Slaves