SU1762407A1 - Sensory button - Google Patents

Abstract

The invention relates to a pulse technique and can be used in input and output devices. The touch button contains a touch pad, two delay elements, a time selector, an information recording control unit, a memory element, and a clock bus. 1 hp f-ly, 2 ill.

Description

The invention relates to a pulse technique and can be used in input and output devices.

The aim of the invention is to increase the reliability of the operation of the device by introducing an information recording control unit.

FIG. 1 shows the timing diagram of the signals at the inputs of the time selector; in fig. 2 - electrical device functional diagram.

The device comprises a touch pad 1, a first delay element 2, a second delay element 3, a time selector 4, an information recording control unit 5, a memory element 6 and a clock bus 7.

The first and second elements 2 of the delays respectively and the information recording control unit are each made in the form of the RC circuits examined, the second resistor 3 1 of the second delay element 3 is adjustable, and the time selector 4 and memory element 6 can be performed, for example On the D-flip-flop, the C-inputs of which are synchronization inputs, and the D-inputs are the information inputs of the corresponding button elements.

The touch button works as follows.

Rectangular clock (synchronous) pulses are applied to the clock bus 7 buttons. At the inputs of the time selector 4, the pulses will be somewhat delayed by the first and second delay elements 2 and 3, respectively. When the operator touches the touch pad 1 as a result of the capacitance applied by him, the pulses at the output of the first element 2 will be delayed relative to the pulses at the output of the second element 3 of the delay. Therefore, in the time selector 4, a logical zero will be written on each clock cycle. In the absence of contact, the delay at the output of the second delay element 3 will be greater than that at the output of the first delay element 2 because of the small capacity between the touch pad 1 and the common bus and in the time selector 4 a logical unit will be recorded at each measure. In this case, the sensitivity of the device can be adjusted over a wide range with the help of a resistor 3.1 of the second delay element 3.

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The information recording control unit 5, together with the memory element 6, makes it possible to eliminate (filter out) false alarms caused by bounce. Through the memory element 6, only low-frequency changes of the signal from the output of the time selector 4 should occur. Filtration is achieved using the information recording control unit 5 by connecting its first input to the non-inverting output of memory element 6. The operation of the node of the information recording control unit 5 - the memory element 6 is as follows: At the moment the touch pad 1 comes into contact at the output of the time selector 4, the signal changes from one to zero, having passed through the stage of multiple transitions 1- O AND 0 1 .. (), eventually ending with zero. The potential of the charged capacitor 5 2 at the same time decreases rather slowly, if in the bounce prevails,

Claims (2)

1. Touch button containing touch pad, clock bus, first and the second delay element, the time selector and the memory element, the touch pad is connected to the first input of the first delay element, the clock bus is connected to the second inputs of the first and The second delay element, the output of the first delay element is connected to the information input of the time selector, and the output of the second delay element is connected to the synchronization input of the selector, so that. In order to increase the reliability of operation, the information recording control unit is entered into it, the first input of which is connected to the non-inverting output of the memory element, the second input is connected to the output of the temporary selector, and the output is connected to the information input of the memory element whose synchronization input is connected to the clock bus, and the first input of the second delay element is connected to the common bus 2. Pop button 1. which distinguishes the first and second delay elements and information recording control block made as the first, agora and third RC chains, respectively, the first drives of the first, second and circuit capacitors of which are connected to the first inputs of the first and second delay elements and the information recording control unit, the second leads of the first, second and third capacitors of the corresponding RC - chains are connected respectively to the outputs of the first and second delay elements and the information recording control unit and through the corresponding first, second and third resistors of the corresponding RC input circuits m, respectively, of the first and second delay elements and the information recording control unit ff 0 / 77Su / 77SL7 $ {/ {I & C & I / / MffHcw0 / 76A 0e (/ 7w & / r7 & tf / T7ff $ 0e y with g o / ha. // prog / l and / her / rf7V r / 77 # 0 / Y & CCrs / C / S I go the entrance W // & t / evytfcmfo, 77e / 7 & Hr / r7U / 3tffr7Lffa0S 30 / 7OC / 70 Sch & C / T7Ј {/ - / 77e / 6 // 0C / 77C / I Fig 1