Abstract: This paper describes small cash systems and the use of iButton® SHA devices, specifically, the DS1963S and DS1961S, as the electronically readable tokens in which the cash is stored. Two scenarios are presented. In scenario A, both the tokens and the coprocessor are DS1963S iButtons. In scenario B, the DS1963S functions as coprocessor in a system that uses the DS1961S as tokens or carriers of electronic cash. The application note you have requested is available in Acrobat PDF format: APPLICATION NOTE 1820: White Paper 1: SHA Devices Used in Small Cash Systems (PDF, 677kB) A free Acrobat PDF reader is available from: http://www.adobe.com/products/acrobat/readstep.html Related Parts   APP 1820: Dec 20, 2002 DS1961S 1Kb Protected EEPROM iButton with SHA-1 Engine DS1963S SHA iButton DS2432 1Kb Protected 1-Wire EEPROM with SHA-1 Engine Abridged Data Sheet (PDF, 164kB) Automatic Updates Would you like to be automatically notified when new application notes are published in your areas of interest? Sign up for EE-Mail™. We Want Your Feedback!   Download, PDF Format (677kB)  AN1820, AN 1820, APP1820, Appnote1820, Appnote 1820