JPH01255315A - Pulse input circuit - Google Patents

Abstract

PURPOSE:To enable the use of a changeover switch having a static condition by providing an open/close switch in series to the common terminal of the changeover switch. CONSTITUTION:An integrated circuit 1 key-scans a switch connected between key output terminals O0-O5 and key input terminals I0, I2 and I3 in a matrix condition, outputs a signal according to the switch in a turn-on condition from a terminal PEM, and lights up infrared radiation light-emitting elements 12 and 13. Selecting terminals A-F of a changeover switch 9 are connected to the key output terminals O0-O6, respectively, a common terminal N is connected through open/close switches 10 and 11 to the key input terminals I0, I2 and I3, a signal to express the switching signal of the operation/stoppage of, for example, an air conditioner and a set value set by the changeover switch 9 is outputted when the switch 10 is pushed, and the signal to express only the set value set is outputted when the switch 11 is pushed. Thus, the setting condition of the changeover switch having the static condition can be always discriminated by an ordinary scanning operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a pulse input circuit that determines the ON state of an open/close switch by key scanning.

(b) Conventional technology In general, conventional switch circuits are
There was something like the one described in Publication No. 8950.

The device described in this publication connects a plurality of switches in a matrix between a key output terminal and a key input terminal, and determines the ON state of the switches by key scanning.

(c) Problems to be Solved by the Invention In such conventional switch circuits, the switch generally uses a mechanical type or electrostatic type touch switch whose contact piece closes (ON) only while the switch is pressed. 40
If there is a switch operation between ~50m5, one switch is O.
It could be determined that it was N. Approximately 1 at the same time
In the case of continuous operation of 50 m5 or more, it is determined that the switch is ON at regular intervals while the switch is being operated, that is, it is determined that the switch has been operated multiple times.

Therefore, when using a changeover switch or the like in which one terminal is always in the ON state, it is necessary to delete the continuous ON state judgment function by key scanning or to develop a new program for key scanning. There was an unavoidable problem.

In view of such problems, the present invention provides a pulse input circuit that can use a changeover switch having a static state in a general-purpose key scan circuit or key scan program.

(d) Means for Solving the Problems The present invention provides a pulse output that is applied from the key output terminal to the key input terminal via the switch, by changing the ON state of the open/close switch connected between the key output terminal and the key input terminal. In a pulse input circuit that discriminates by presence/absence, multiple selection terminals and
Each selection terminal of a changeover switch having a single common terminal and a selection portion that electrically connects the common terminal and any one of the selection terminals is connected to a different key output terminal, and the common terminal is connected to a different key output terminal. It is connected to the key input terminal via an on/off switch.

Further, each selection terminal of a changeover switch having a plurality of selection terminals, a single common terminal, and a selection portion that electrically connects the common terminal and any one of the selection terminals is inputted with a different key. The common terminal is connected to the key output terminal via an open/close switch.

(f) Function In the pulse input circuit configured as described above, an open/close switch is provided in series with the common terminal of the changeover switch, and when the open/close switch is operated, a scan output that conveys the selected position of the changeover switch is passed through. .

(f) Examples Examples of the present invention will now be described based on the drawings. Figure 1 is an electronic circuit diagram. 1 in Figure 1 is an integrated circuit, with key output terminals O0 to 0 and key input terminals.

The ON state of the switches having L and Is connected in a matrix between these terminals is scanned by a key, and a signal of a code corresponding to the switch in the ON state is output from the terminal REM. Reference numerals 2 to 8 are touch switches, and the contacts are electrically connected only while the switches are being operated. The switches 2 to 8 have one end connected to the key output terminals 00 to 0 of the integrated circuit 1, respectively. The other end is connected to the key input terminal 1°. 9 is a changeover switch, and selection terminal A
. . . F to key output terminals 0° to 0.0° of the integrated circuit 1, respectively. and connect the common terminal N to the key input terminal 1. through the touch switch 1o. The common terminal N is further connected to a key input terminal 13 via a touch switch 11. Reference numeral 12 and 13 are infrared light emitting elements, which blink in response to ON10FF of the switching element 14. This switching element 14 is connected to a terminal REM of the integrated circuit 1, and 0N10FF is controlled by a modulated hood signal output from this terminal REM. A visible light emitting element 15 is connected to the terminal LMP of the integrated circuit 1, and lights up simultaneously when the infrared light emitting elements 12 and 13 are turned on.

The integrated circuit 1 has key output terminals 0° to 0. Any one terminal outputs an output periodically, and the key input terminals I-, L, and L sequentially scan this output. For example, if there is an output from the key output terminal 0° when the switch 2 is pressed and the gate of the key input terminal 1° is open, it is possible to determine the operation by (0,,1,). One cycle of these series of scanning operations is extremely short compared to manual switch operation.

Further, if the common terminal N of the changeover switch 9 is connected to the selection terminal, the operation (G to It) can be determined only by pressing the switch 10.

Figure 2 shows key output terminals 00 to O0 and key input terminals.

＋I! It is an explanatory view when operation of an air conditioner is assigned to the operation in combination with rIs.

(O0~1°) are operation signals for switching between cooling and heating operation, wind speed strength, etc., (0,~1.) are operation signals for stopping operation, and at the same time, the setting value of the changeover switch 9 (room temperature (corresponding to the setting value) is also specified. (0°, I,) is the setting value of the changeover switch 9.

With this kind of allocation, when switches 2 to 8 are pressed, the operation signal corresponding to that switch is output, and when switch 10 is pressed, the air conditioner run/stop switch signal and changeover switch 9 are output. A signal representing the set value is output, and when switch 11 is pressed, selector switch 9
Outputs a signal representing only the setting value set in . still,
When switch 6 (timer operation switch) is kept pressed, an increase signal for timer operation is continuously outputted approximately every second.

(g) Effects of the Invention The present invention provides a pulse input circuit configured to determine the ON state of a switch connected between a key output terminal and a key input terminal by key scanning.
Each selection terminal of a changeover switch having a single common terminal and a selection portion that electrically connects the common terminal and any one of the selection terminals is connected to a different key output terminal, and the common terminal is connected to a different key output terminal. Since it is connected to the key input terminal via the open/close switch, the setting state of the changeover switch can be input only when the open/close switch is operated, and the setting state of the changeover switch, which is always in a static state, can be determined by normal scanning operations. It is something.

[Brief explanation of the drawing]

FIG. 1 is an electronic circuit diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing how operation signals are assigned by combinations of key output terminals and key input terminals. DESCRIPTION OF SYMBOLS 1... Integrated circuit, 2-8... Touch switch, 9... Changeover switch, 10.11... Switch.

Claims (2)

[Claims] (1) In a pulse input circuit that determines the ON state of an open/close switch connected between a key output terminal and a key input terminal based on the presence or absence of a pulse output given to the key input terminal from the key output terminal via the switch, a selection terminal, a single common terminal, and any one of this common terminal and the selection terminal.
A pulse pulse characterized in that each selection terminal of a changeover switch has a selection part electrically connected to the terminal, and each selection terminal is connected to a different key output terminal, and the common terminal is connected to a key input terminal via an open/close switch. input circuit. (2) In a pulse input circuit that determines the ON state of an open/close switch connected between a key output terminal and a key input terminal based on the presence or absence of a pulse output given to the key input terminal from the key output terminal via the switch, a selection terminal, a single common terminal, and any one of this common terminal and the selection terminal.
A pulse pulse characterized in that each selection terminal of a changeover switch has a selection part electrically connected to the terminal, and each selection terminal is connected to a different key input terminal, and the common terminal is connected to a key output terminal via an open/close switch. input circuit.