| 摘要 |
PURPOSE:To ensure a detection operation checking the same sensor more than twice while economizing circuits by employing a multiplexer system for the circuitry in a sensor state detection system to use a signal reception circuit in a multiplex manner. CONSTITUTION:A multiplexer driving circuit 8 has a function of turning ON 8- 1CH-8-4CH sequentially by switching. When the circuit 8-1CH is turned ON, a counter circuit 7 is started and after the time counting as specified, an input/output processing circuit 9 ANDs individual output signal of the 3-8CH with an output signal of the circuit 8-1CH from a reception circuit 3-1CH to obtain detection information of sensors in the CH1-CH8. This delay time absorbs ringings of the circuits and delays of ICs to ensure an accurate detection information processing. When the circuits 8-1CH is turned OFF and instead, the circuit 8-2CH is turned ON, simultaneously, the circuit 7 is reset and starts to count a specified delay time in the same way and then, the circuit 9 ANDs individual output signals of the 3-8CH with an output signal of the circuit 8-2CH from the 3-1CH to obtain detection information of sensors of CH9-17.
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