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10. ESD Considerations

KeyWarrior has an internal ESD protection to

withstand discharges of more than 2000V without

permanent damage. However ESD may disrupt

normal operation of the chip and cause it to exhibit

erratic behaviour.

For the typical office environment the 2000V

protection is normally sufficient. Though for

industrial use additional measures may be

necessary.

When adding ESD protection to the signals special

care must be taken on the USB signal lines. The

USB has very low tolerance for additional

resistance or capacitance introduced on the USB

differential signals.

10.1 EMC Considerations

KeyWarrior uses relatively low power levels and

so it causes few EMC problems.

To avoid any EMC problems the following rules

should followed:

• Put a 100nF ceramic capacitor right next to the

power supply pins and make sure the PCB

traces between the chips power pins and the

capacitor are as short as possible.

• Run the power supply lines first to the capacitor,

then to the chip.

• Make the signal lines only as long as absolutely

necessary.

Adding a ferrite bead to the +5V and ground power

supply lines is advisable.

11. Revision History

This is a supplemental data sheet to the

KeyWarrior data sheet. Please refer to the main

data sheet for the revision history.

V1.1.1.D is the inital release version of the

KeyWarrior24D.

12. RoHS compatibility

RoHS compatible parts are indicated by a "R"

being appended to the version number.

I.e. a KeyWarrior24D in DIL24 package will have

a marking as follows if it is RoHS compatible:

KW24D-P

V1.1.1.DR

Legal Stuff

Mercenaries Hard- und Software GmbH.

The information contained herein is subject to

change without notice. Code Mercenaries makes

no claims as to the completeness or correctness of

the information contained in this document.

Code Mercenaries assumes no responsibility for

the use of any circuitry other than circuitry

embodied in a Code Mercenaries product. Nor

does it convey or imply any license under patent or

other rights.

Code Mercenaries products may not be used in any

medical apparatus or other technical products that

are critical for the functioning of lifesaving or

supporting systems. We define these systems as

such that in the case of failure may lead to the

death or injury of a person. Incorporation in such a

system requires the explicit written permission of

the president of Code Mercenaries.

Trademarks used in this document are properties of

their respective owners.

Code Mercenaries

Hard- und Software GmbH

Karl-Marx-Str. 147a

12529 Schönefeld

Germany

Tel: +49-3379-20509-20

Fax: +49-33790-20509-30

Mail: support@codemercs.com

Web: www.codemercs.com

HRB 9868 CB

Geschäftsführer: Guido Körber, Christian Lucht

V 1.0.0, December 2nd 2013, for chip revision 1.1.1.D and up