High Performance Automotive Sonar Intrusion – Data Sheet

AS8413

March 2001

Page 15 of 15

EMI Protection

The usual precautions against EMI, such as PCB with ground plane, short tracks and shielded

cables, are recommended for AS8413 applications, to avoid possible effects from noise induced

by external sources.

The RX cable must be shielded, because of the low-voltage signal. An alternative to protect other

pins directly connected to unshielded cables, is to clamp induced voltages with signal diodes

close to the pins (Fig.9)

If a single shielded cable is used for the transmitting sensor, the internal wire may be connected

to TX1 and the shield connected to TX2. In this case, only the TX2 output will need protection

diodes

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VDD

(a)

(b)

Fig. 9 - Diode Clamp Protection for

Unshielded Cables

(a) pins 1, 24

(b) pins 21, 22, 23

Copyright

© 2000, Austria Mikro Systeme International AG, Schloß Premstätten, 8141 Unterpremstätten, Austria.

All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by

any means, without the prior permission in writing by the copyright holder. To the best of its knowledge, Austria Mikro Systeme

International asserts that the information contained in this publication is accurate and correct.

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