A process for the reduction of the current consumption of a mobile data memory, the application of the method in an identification system having at least one read - / read device and a mobile data memory

摘要

The present invention relates to a process for the reduction of the current consumption (ib) of a mobile data memory (dt) with a contactless data transmission (is, ldat) with a read - / write device (slg). According to the invention, the mobile data memory, which at least one energy store (bat) and consumers (emp, send, q1, q2, c, mem), at least for a cyclic (t) inactive reset mode (if1, ir) with a first clock frequency (f1) of a first oscillator (q1) and for the data reception at least during a cyclic interrogation time (ta) with a second higher clock frequency (f2) of a second oscillator (q2) supplies. The second clock frequency is in particular for the data modulation of a received signal (it) determines which of the receiving antenna (sa, ea) or of a combined transmitter - / receiving antenna of the mobile data memory originates. Furthermore, the invention relates to a mobile data memory, as well as an identification system (is) with at least one read - / read device and a mobile data memory. This is connected with the advantage that, for the entire service life of the mobile data memory is no longer necessary to change the battery.