IZ1990

TECHNICAL DATA CMOS IC FOR ELECTRONIC KEY IZ1990 DESCRIPTION CMOS microcircuit is essentially an electronic carrier of the unique 64-bit digital code. The code is stored in the internal nonvolatile memory. The data exchange is performed by the protocol 1-Wire, which requires one sole data pin and the common pin. The microcircuit supports the function of the protocol 1-Wire of ROM search, which makes it possible for several devices to operate on one bus. This protocol determines the alteration conditions of the bus status and the time intervals during synchronization by the synchropulses cuts of the control device. Data read-out and writing are performed by the junior significant bit forward. TRANSACTION SEQUENCE Access sequence to IZ1990 via 1-Wire port is as follows:  Initialization  ROM function command  Data read-out INITIALIZATION All transactions on the bus 1-Wire start with the initialization sequence. The initialization sequence consists of the reset pulse, applied...