CFA633-RDI-KS datasheet(68/88 Pages) CRYSTAIFONTZ

68 / 88 page

Crystalfontz America, Inc.

Data Sheet Release Date 2012/02/21

www.crystalfontz.com

CFA633-RDI-KS LCD Module (Hardware v2.0 / Firmware s2v1)

February 2012

Page 68

APPENDIX B: CONNECTING A DS1963S SHA IBUTTON

This appendix describes connecting a Dallas Semiconductor DS1963S Monetary iButton with SHA-1 Challenge

Response Algorithm and 4KB of nonvolatile RAM to the CFA633’s DOW (Dallas One Wire) connector. It also gives a

sample command sequence to read and write the DS1963S’s scratch memory.

The DS1963S can be used as a secure dongle to protect your system’s application software from being copied. Even if

the communication channel is compromised or the host is not authentic, the SHA algorithm ensures that the data is still

secure. Please see the following Maxim/Dallas white papers and application notes for more information:



White Paper 1: SHA Devices Used in Small Cash Systems



White Paper 2: Using the 1-Wire Public-Domain Kit



White Paper 3: Why are 1-Wire SHA-1 Devices Secure?



White Paper 4: Glossary of 1-Wire SHA-1 Terms



App Note 1201: White Paper 8: 1-Wire SHA-1 Overview



App Note 150: Small Message Encryption using SHA Devices



App Note 152: SHA iButton Secrets and Challenges



App Note 154: Passwords in SHA Authentication



App Note 156: DS1963S SHA 1-Wire API Users Guide



App Note 157: SHA iButton API Overview



App Note 190: Challenge and Response with 1-Wire SHA devices

Up to 32 DOW devices can be connected to the CFA633. In this example the DS1963S appears at device index 0. Your

software should query the connected devices using command 19 (0x13): Set Up Temperature Reporting (Pg. 48) to

verify the locations and types of DOW devices connected in your application.

Please refer to the DS1963S Data Sheet and the description for command 20 (0x14): Arbitrary DOW

Transaction (Pg. 49) for more information.

To connect the DS1963S to the CFA633, simply make one connection between the DS1963S’s "GND" terminal and the

CFA633 DOW connector’s GND pin, and a second connection between the DS1963S’s "IO" pin and the CFA633 DOW

connector’s I/O pin. By using a DS9094 iButton Clip, the connection is easy.

Appendix B, Figure 1. Connecting DS1963S SHA iButton using DS9094 iButton Clip

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