RF identification system for providing static data and one bit of variable data representative of an external stimulus

摘要: An RF identification system for generating data indicative of an item that is tagged, and one bit variable representative external stimulus. ID code reader provided tag coupled to the be monitored queries tag. The comprises two transponder chips store a relating item, excitation coil thereto. A switch coil, capacitor across switch. sensor stimulus, such as pressure in tire. exciter receiver coil. includes phase detection circuitry detecting state by shift between signals received from each chips. When shorted, effect nullified. open, then return signal second chip has small with respect first chip. detects this determines permits use remote or inaccessible positions determine (the position switch) data. example vehicle tire stores also enables reading confirm adequate pressure.