SU919088A1 - Sensory switching-over device - Google Patents

Description

(54) TOUCH TRANSFER DEVICE

The invention relates to a pulse technique, in particular to a device. you contactless keypads, triggered by the touch of the operator and intended for use in input devices in various electronic devices with its subsequent processing or display. A sensor switch is known, which contains sensor sensors, a distributor, display units, and frequency range switches 1. The disadvantage of this device is complexity, which reduces the reliability of the device. The closest technical solution to the present invention is a sensor switch containing a multiplexer connected to the sensor platforms and to the counter outputs, the counting input of which is connected to the clock bus, register, trigger and logic (t s. device fp - low reliability due to high demands on the duration and form of clock pulses and complexity of the equipment. The purpose of the invention is to improve the reliability of the sensor Permanent switching device which is connected to the switch output, and the output - to the meter enable input and additional output bus. The drawing shows the functional diagram of the device. The device contains touch pads 1, counter 2, switch,

amplifier shaper 4, the output bus (outputs). 5 and 6.

The device operates as follows.

The operation of the device is based on the use of alternating voltages on a human body.

In the initial state, at the output of the amplifier t, there is a high voltage level that goes to the enable input of counter 2. The counters input of counter 2 receives pulses that change with the clock frequency of the state of its outputs. The outputs of counter 2 are connected to the corresponding scanning inputs of switch 3. The outputs of counter 2 are simultaneously output buses 5 of the device, on

which the output code is generated.

if the operator touches any touch pad 1 and with the corresponding code on the scanning inputs of the switch 3 analog signals, the signal of the alternating voltage pickup goes to the output of switch 3 and then to the input of the shaping amplifier k. At the output 6 of the amplifier-forger +, a low voltage level is generated, which is forbidden to be counted in counter 2. At the same time, the front of the signal from the output 6 of the amplifier-forger k reads the code from the output buses of the device. A low voltage level is present at the output of the amplifier k when the operator touches the touch pad, while the state of the counter 2 does not change.

After the operator releases the touch pad from the output of the driver shaper k, a high voltage level is removed, which is allowed to be counted in counter 2.

The analog inputs are scanned by switch 3.

At the next touch of the operator to any touch pad 1, all processes are repeated.

Thus, the introduction of an amplifier-former into the sensor switching device eliminates the influence of the shape duration and frequency of the clock pulses, which increases the reliability of the device operation.

Claims (1)

1. Shpilman E.M. and Buchman D.R. First-class TV Horizon107, Sw., I., 1978. 2o USSR author's certificate i ° 575773, cl. H 03 K 17/00, 1975. R one "VJ