Hi,

I just purchased a DS1961S iButton EEPROM. Seemed to be pretty straightforward until I started to write the code. Reading is standard 1-wire, but to write from the scratchpad to the EEPROM memory you have to perform a "SHA-1 Algorithm" which generates a 160-bit MAC which is needed to start the transfer.

Has anyone seen this or worked with it or even understand it.

Please help

Chris