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AN1816

USING THE HC912B32 TO IMPLEMENT THE DISTRIBUTED SYSTEMS INTERFACE (DSI) PROTOCOL

Freescale Semiconductor 

Freescale Semiconductor, Inc.

HARDWARE DESIGN

Slave Board

Schematics and

Layout

Considerations -

Slave Board

The slave board discussed in this application note is one that was

designed as part of a DSI evaluation tool kit. It contains the Bus

Evaluation Module (BEM) IC, which is a slave DSI interface evaluation

device. It provides bi-directional communications from the DSI bus. The

slave board contains an on board potentiometer which can be used to

vary the voltage input to the BEM IC. This voltage is converted by the

BEM IC to a digital signal that is then transmitted over the DSI bus.

Alternatively, an accelerometer or other analogue output device could be

connected using the wire wrap area of the slave board and the jumper

setting changed such that the output of the accelerometer is input to the

BEM IC. Multiple slave nodes can be attached to one DSI bus by daisy

chaining them together.

SLAVE BOARD REV

REVISIONS

DESCRIPTION

DATE

Bus signals from ECU

U3

BUS_IN

GND

BUS_OUT

1

2

3

CON3WAY

GND

D1

DIODE ZN1

VR1

GND

31

J1

2

1

1

R2

R1

10K 10K

2

2

GND GND

D2

DIODE ZN1

U4

14

1

12

BUS_IN

BUS_GND

BUS_GND

5

6

AGND

AGND

2

4

7 SIG_IN

1

C3

2 0.1uF

BEM IC

GND

BUS_OUT 16

VREG 10

N/C

N/C

9

8

FILT_CAP 11

N/C

N/C

N/C

3

13

15

C2

4.7uF

GND

C1

1.0uF

GND

VREG

SIGIN

BUSIN

BUSOUT

TP1

TEST POINT

TP2

TEST POINT

TP3

TEST POINT

TP4

TEST POINT

AN1816

COMPUTER GENERATED DRAWING : DO NOT REVISE MANUALLY

Figure 11 Slave Board Schematic

OCCUPANT SAFETY SYSTEMS

Title

SLAVE BOARD

Size Document Number

B

SLAVE.SCH

Date:

August 10, 1999 Sheet

REV

1 of

1

For More Information On This Product,

11

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