Dallas semiconductor ds1990r f5 serial number ibutton
Ibutton serial number dallas semiconductor ds1990r f5 this serial number type ibutton is a ruggedly easy to use device that serves as an electronic registration number for automatic identification data is transferred via the 1 wire protocol requiring only a single signal lead plus a ground return br br every device is factory lasered with a guaranteeed unique 64 bit registration number allowing for complete traceability suitable applications include access control workflow tracki