CN102789319A - Keyboard, key detection device and electronic equipment - Google Patents

Keyboard, key detection device and electronic equipment Download PDF

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Publication number
CN102789319A
CN102789319A CN2012102363585A CN201210236358A CN102789319A CN 102789319 A CN102789319 A CN 102789319A CN 2012102363585 A CN2012102363585 A CN 2012102363585A CN 201210236358 A CN201210236358 A CN 201210236358A CN 102789319 A CN102789319 A CN 102789319A
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voltage
keyboard
detection module
port
resistance
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李东声
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Tendyron Technology Co Ltd
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Tendyron Technology Co Ltd
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Abstract

The invention provides a keyboard, a key detection device and electronic equipment. The keyboard comprises a first transmission line, a second transmission line and N key circuits, wherein the first transmission line and the second transmission line are connected with the key detection device; and the N key circuits are connected between the first transmission line and the second transmission line. The first end of a resistor Ri of the ith key circuit is connected with the second end of a resistor Ri-1 of the i-1th key circuit and the first end of a key switch Ki-1, and the second end of the resistor Ri is connected with the first end of a key switch Ki. The key detection device comprises a first port, a second port, a detection power supply, a detection resistor Ry, a first voltage detection module, a second voltage detection module and a key detection module, wherein the first port is connected with the first transmission line; the second port is connected with the second transmission line; and the key detection module is used for detecting the key switching-on condition of the keyboard according to the voltage output values of the first voltage detection module and the second voltage detection module. The keyboard, the key detection device and the electronic equipment have the beneficial effects that the structure is simple, the detection method is convenient to realize, and only two I/O (Input/Output) interfaces are adopted.

Description

A kind of keyboard, button pick-up unit and electronic equipment
Technical field
The present invention relates to electronic technology field, particularly a kind of keyboard, button pick-up unit and electronic equipment.
Background technology
Keyboard is the combination of one group of button, and it is the most frequently used input equipment, and operating personnel can pass through key in data or order, realize simple man-machine conversation.
Existing keyboard is divided into free-standing keyboard and matrix keyboard from structure, and general button adopts free-standing keyboard more after a little while, and button adopts matrix keyboard more for a long time.
In the stand alone type keyboard, a corresponding I/O (I/O) interface of each button has the relative characteristic of simple of design of hardware and software, its shortcoming be number of keys more for a long time, need take a large amount of I/O interfaces.
Matrix keyboard is applied to the more occasion of number of keys, and it is made up of column rule and alignment, and each button is positioned on the point of crossing of column rule and alignment.One 3 * 3 row-column configuration can constitute a keyboard that 9 buttons are arranged.In like manner, one 4 * 4 ranks can constitute the keyboard of one 16 button.Clearly, in the more occasion of number of keys, compare with free-standing keyboard, matrix keyboard will be saved a lot of I/O interfaces.
Though matrix keyboard of the prior art has been saved more I/O interface than free-standing keyboard, it still exists and takies a large amount of I/O interfaces, the shortcoming of structure relative complex.
Summary of the invention
The shortcoming complicated based on keyboard structure in the prior art, that I/O interface quantity is big the present invention proposes a kind of simple in structure, keyboard that I/O interface quantity is few, is used for the keyboard detection device of this keyboard and the electronic equipment that comprises this keyboard.
The technical solution adopted for the present invention to solve the technical problems is:
The invention provides a kind of keyboard, comprising: be used for first transmission line and second transmission line that link to each other with the button pick-up unit, and be connected N key circuit between first transmission line and second transmission line, N=1,2, i ..., n-1, n;
I key circuit comprises a resistance R i, and one and this resistance R iThe keyswitch K that is connected in series i
Wherein, the R of the 1st key circuit 1First end link to each other R with first transmission line 1Second end and K 1First end and the R of the 2nd key circuit 2First end link to each other K 1Second end link to each other with second transmission line,
The R of i key circuit iFirst end and the resistance R of i-1 key circuit I-1Second end and K I-1First end link to each other R iSecond end and keyswitch K iFirst end link to each other keyswitch K iSecond end be connected with second transmission line, i=2,3 ..., n.
Preferably, said keyboard comprises 12 key circuits.Wherein, R 1=82 Ω, R 2=100 Ω, R 3=120 Ω, R 4=150 Ω, R 5=180 Ω, R 6=220 Ω, R 7=300 Ω, R 8=430 Ω, R 9=680 Ω, R 10=1100 Ω, R 11=2200 Ω, R 12=6800 Ω.
The present invention also provides a kind of button pick-up unit that is used to detect this keyboard, and said button pick-up unit comprises: first port, and second port detects power supply, detects resistance, first voltage detection module;
First port is used for being connected with first transmission line of said keyboard;
Second port is used for being connected with second transmission line of said keyboard;
Said detection resistance and detection power supply are connected between said first port and second port;
First voltage detection module, the branch pressure voltage value that is used to detect and export the branch pressure voltage value of said keyboard or detects and export said detection resistance;
The button detection module is used to receive the magnitude of voltage that first voltage detection module is exported, and detects the button connection situation of keyboard according to the magnitude of voltage of first voltage detection module output.
Preferably, first end of said detection resistance links to each other with said first port or second port;
The two ends of said first voltage detection module link to each other with second port with said first port respectively, are used to detect and export the branch pressure voltage value of said keyboard.
Preferably, first end of said detection resistance links to each other with said first port or second port;
The two ends of said first voltage detection module link to each other with the two ends of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance.
Preferably, also comprise in the said button pick-up unit: second voltage detection module;
First end of said detection resistance links to each other with said first port; The two ends of said second voltage detection module link to each other with said second port with second end of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance and said keyboard; Or first end of said detection resistance links to each other with said second port; The two ends of said second voltage detection module link to each other with said first port with second end of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance and said keyboard;
Said button detection module also is used to receive the magnitude of voltage of said second voltage detection module output, and detects the button connection situation of keyboard according to the magnitude of voltage that the magnitude of voltage and second voltage detection module of the output of first voltage detection module are exported.
Also comprise in the said button pick-up unit: second voltage detection module;
The two ends of said second voltage detection module link to each other with the two ends of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance;
Said button detection module also is used to receive the magnitude of voltage of said second voltage detection module output, and detects the button connection situation of keyboard according to the magnitude of voltage that the magnitude of voltage and second voltage detection module of the output of first voltage detection module are exported.
The present invention also provides a kind of electronic equipment, and it comprises aforesaid keyboard and button pick-up unit.
Keyboard among the present invention adopts the mode that is connected in parallel step by step; When i button is pressed; When promptly i keyswitch is switched on; The resistance of this keyboard is
Figure BDA00001864890300031
resistance characteristics according to this keyboard, and the button pick-up unit can detect resistance and the current subscript value i that is in the keyswitch of on-state of voltage detecting that is carried in the keyboard two ends according to being carried in.
Keyboard of the present invention, button pick-up unit and electronic equipment simple in structure, detection method is convenient to be realized, only adopts two I/O interfaces, and can not cause the increase of I/O interface quantity owing to the increase of number of keys, is convenient to the expansion of keyboard capacity.
Description of drawings
Fig. 1 is the structural representation of first embodiment of electronic equipment of the present invention.
Fig. 2 is the structural representation of second embodiment of electronic equipment of the present invention.
Fig. 3 is the structural representation of the 3rd embodiment of electronic equipment of the present invention.
Embodiment
The invention provides a kind of simple in structure, keyboard that I/O interface quantity is few, be used for the keyboard detection device of this keyboard and comprise this keyboard and the electronic equipment of keyboard detection device.
Fig. 1 is the structural representation of first embodiment of electronic equipment of the present invention.As shown in Figure 1, electronic equipment of the present invention comprises keyboard 101 and button pick-up unit 102.
Wherein, keyboard 101 comprises: the first transmission line S that is used for linking to each other with button pick-up unit 102 1With the second transmission line S 2, and be connected the first transmission line S 1With the second transmission line S 2Between N key circuit, N=1,2, i ..., n-1, n.Be the structure that example shows keyboard 101 with N=12 among Fig. 1.
In keyboard 101, i key circuit comprises a resistance R i, and one and this resistance R iThe keyswitch K that is connected in series i
Wherein, the R of the 1st key circuit 1First end and the first transmission line S 1Link to each other second end and K 1First end and the R of the 2nd key circuit 2First end link to each other K 1Second end and the second transmission line S 2Link to each other.
And the R of i key circuit iFirst end and the resistance R of i-1 key circuit I-1Second end and K I-1First end link to each other R iSecond end and keyswitch K iFirst end link to each other keyswitch K iSecond end and the second transmission line S 2Connect, i=2,3 ..., n.
Can know that in conjunction with Fig. 1 the keyboard among the present invention adopts ways of connecting step by step, when i button is pressed, i.e. i keyswitch K iWhen being switched on, R has connected between first transmission line and second transmission line 1To R iBe total to i resistance, the resistance of this keyboard is
Figure BDA00001864890300041
Through detecting the resistance value R of keyboard x, the subscript value i of the button that can confirm accordingly to be pressed.
Because the resistance value R of subscript value i and keyboard xHave one to one relation, the resistance value in the time of therefore can calculating and store each button of this keyboard in advance and be pressed is through the resistance value R of real-time detection keyboard x, detected value and storing value are in advance compared, thus the subscript value i of the button of confirming fast to be pressed.
According to the resistance characteristics of keyboard of the present invention, the present invention also provides a kind of button that is used to detect this keyboard to connect the button pick-up unit of situation.
Below to several preferred embodiments of button pick-up unit electronic equipment of the present invention is described respectively.
First embodiment
Fig. 1 is the structural representation of first embodiment of electronic equipment of the present invention.As shown in Figure 1, the second port D 2Connect with voltage tester reference Point C point (for example, earth point, or second end of detection power supply 111), detect resistance 112 (R y) first end and the first port D 1Connect, detect resistance 112 (R y) second end be connected with first end that detects power supply 111.
Detect first end (detecting the output terminal of power supply) and detection resistance 112 (R of power supply 111 y) second end between be the A point, detect resistance 112 (R y) first end and the first port D1 between be the B point, the voltage tester RP is the C point.
First end of second voltage detection module 114 is connected with the A point, and second end and voltage tester RP (for example, earth point) connect, and is used for detecting power supply 111 and detects resistance 112 (R y) between A point voltage U 2
First end of first voltage detection module 113 is connected with the B point, and second end is connected with the C point, is used for detecting the resistance 112 and the first port D 1Between B point voltage U 1B point voltage U 1Be the voltage that is carried in keyboard 101 two ends.
Button detection module 115 can be according to U 1, U 2And R yCalculate the resistance R of keyboard this moment xResistance,
R x = U 2 U 1 - U 2 × R y ; Wherein, R x = Σ i = 1 n R [ i ] ,
And with R xResistance with in advance the storage resistance value compare, according to R xResistance judge i button connection of keyboard.
Perhaps, detect resistance 112 (R y) can with the second port D 2Connect.The first port D then 1Be connected with the C point, detect resistance 112 (R y) first end and the second port D 2Connection, second end and detection power supply 111 are connected; Then first end of second voltage detection module 114 is connected with the A point, and second end and voltage tester RP (for example, earth point) connect, and are used to detect A point voltage U 2First end of first voltage detection module 113 is connected with the B point, and second end is connected with the C point, is used to detect B point voltage U 1
Then likewise, button detection module 115 can be according to U 1, U 2And R yCalculate the resistance R of keyboard this moment xResistance,
R x = U 2 U 1 - U 2 × R y ; Wherein, R x = Σ i = 1 n R [ i ] ,
And with R xResistance with in advance the storage resistance value compare, according to R xResistance judge i button connection of keyboard.
Comprise that with keyboard 101 12 key circuits are example,, the invention provides a kind of preferred resistance plan of establishment for the ease of calculating.R 1=82Ω，R 2=100Ω，R 3=120Ω，R 4=150Ω，R 5=180Ω，R 6=220Ω，R 7=300Ω，R 8=430Ω，R 9=680Ω，R 10=1100Ω，R 11=2200Ω，R 12=6800Ω。Certainly, the resistance setting in keyboard of the present invention and the electronic equipment is not limited in this.
As shown in Figure 1, keyboard 101 of the present invention only needs two I/O interfaces, promptly with the first transmission line S 1With the second transmission line S 2The interface that connects.And the number of keys of the quantity of I/O interface and keyboard 101 is irrelevant, and when the number of keys of keyboard 101 increased, its I/O interface quantity can not change.Make the number of keys of keyboard can not be restricted owing to the quantity of I/O interface.
Further, the number of keys of keyboard 101 of the present invention can expand easily.Particularly, suppose the keyboard 101 current i-1 of a having button, i=2,3 ..., n.When needs increase by 1 button again, need not the structure of current keyboard 101 is adjusted first end of i the key circuit that only need will increase and the resistance R of i-1 key circuit I-1Second end and keyswitch K I-1First end connect second end and keyswitch K iFirst end connect, and with keyswitch K iSecond end and the second transmission line S 2Connect and get final product.Expand convenient and simplely, and need not adjust, thereby reduce cost, strengthened versatility existing keyboard structure.
According to ultimate principle of the present invention, first embodiment of the invention can also have multiple mapping mode, for example:
1) when the magnitude of voltage that detects power supply 111 output voltages is predefined steady state value, i.e. U 2During for the steady state value that can know in advance, can omit second voltage detection module 114;
2) can calculate and store U in advance according to above-mentioned formula 1Value and U 2The mapping table of value and keyboard sequence number i is when detection obtains U 1Value and U 2During value, directly obtain keyboard sequence number i with lookup table mode; Perhaps
Work as U 2During for the steady state value that can know in advance, calculate and store U in advance 1The mapping table of value and keyboard sequence number i is when detection obtains U 1During value, directly obtain keyboard sequence number i with lookup table mode.
3) detect resistance 112 an end can with the second port D 2Link to each other, the other end links to each other with voltage tester reference Point C point, the two ends of first voltage detection module 113 respectively with the first port D 1With the second port D 2Link to each other.
Second embodiment
Fig. 2 is the structural representation of second embodiment of electronic equipment of the present invention.Keyboard 101 shown in Fig. 2 is identical with the structure of first embodiment, and its difference only is the structure of button pick-up unit 201.
As shown in Figure 2, the second port D 2Connect with C point (for example, earth point, or second end of detection power supply 211), detect resistance 212 (R y) first end and the first port D 1Connection, second end and detection power supply 211 are connected.First end of second voltage detection module 214 is connected with the A point, and second end is connected with the C point, is used to detect A point voltage U 2
First end of first voltage detection module 213 is connected with the A point, second end and the detection resistance 212 and the first port D 1Between the B point connect, be used to detect the voltage difference U between A point voltage and the B point voltage 1Voltage difference U between A point voltage and the B point voltage 1Be to be carried in and detect resistance 212 (R y) voltage at two ends.
Button detection module 215 can be according to U 1, U 2And R yCalculate the resistance R of keyboard this moment xResistance,
R x = U 1 - U 2 U 2 × R y ; Wherein, R x = Σ i = 1 n R [ i ] ,
And with R xResistance with in advance the storage resistance value compare, according to R xResistance judge i button connection of keyboard.
Perhaps, the first port D 1Be connected with the C point, detect resistance 212 (R y) first end and the second port D 2Connection, second end and detection power supply 211 are connected.First end of second voltage detection module 214 is connected with the A point, and second end is connected with the C point, is used to detect A point voltage U 2
First end of first voltage detection module 213 is connected with the A point, second end and the detection resistance 212 and the second port D 2Between the B point connect, be used to detect the voltage difference U between A point voltage and the B point voltage 1Voltage difference U between A point voltage and the B point voltage 1Be to be carried in and detect resistance 212 (R y) voltage at two ends.
Then likewise, button detection module 215 can be according to U 1, U 2And R yCalculate the resistance R of keyboard this moment xResistance,
R x = U 1 - U 2 U 2 × R y ; Wherein, R x = Σ i = 1 n R [ i ] ,
And with R xResistance with in advance the storage resistance value compare, according to R xResistance judge i button connection of keyboard.
According to ultimate principle of the present invention, second embodiment of the invention can also have multiple mapping mode, for example:
1) when the magnitude of voltage that detects power supply 211 output voltages is predefined steady state value, i.e. U 2During for the steady state value that can know in advance, can omit second voltage detection module 214;
2) can calculate and store U in advance according to above-mentioned formula 1Value and U 2The mapping table of value and keyboard sequence number i is when detection obtains U 1Value and U 2During value, directly obtain keyboard sequence number i with lookup table mode; Perhaps
Work as U 2During for the steady state value that can know in advance, calculate and store U in advance 1The mapping table of value and keyboard sequence number i is when detection obtains U 1During value, directly obtain keyboard sequence number i with lookup table mode.
3) detect resistance 212 an end can with the second port D 2Link to each other, the other end links to each other with voltage tester reference Point C point, and the two ends of first voltage detection module 213 link to each other with the two ends of detecting resistance 212 respectively.
The 3rd embodiment
Fig. 3 is the structural representation of the 3rd embodiment of electronic equipment of the present invention.Keyboard 101 shown in Fig. 3 is identical with the structure of first, second embodiment, and its difference only is the structure of button pick-up unit 301.
As shown in Figure 3, the second port D 2Connect with C point (for example, earth point, or second end of detection power supply 311), detect resistance 312 (R y) first end and the first port D 1Connect, second end is connected with detection power supply 311.First end of first voltage detection module 313 is connected with the B point, and second end is connected with the C point, is used for detecting the resistance 312 and the first port D 1Between B point voltage U 1B point voltage U 1Be the voltage that is carried in keyboard 101 two ends.
First end of second voltage detection module 314 is connected with the A point, and second end is connected with the B point, is used to detect A point and the voltage difference U between the B point between power supply 311 and the detection resistance 312 2Voltage difference U between A point and the B point 2Be and be carried in the voltage that detects resistance 312 two ends.
Button detection module 315 is according to U 1, U 2And R yCalculate the resistance R of said keyboard xResistance,
R x = U 1 U 2 × R y ; Wherein, R x = Σ i = 1 n R [ i ] ,
And with R xResistance with in advance the storage resistance value compare, according to R xResistance judge i button connection of keyboard.
Perhaps, the first port D 1Be connected with the C point, detect resistance 312 (R y) first end and the second port D 2Connect, second end is connected with detection power supply 311.First end of first voltage detection module 313 is connected with the B point, and second end is connected with the C point, is used for detecting the resistance 312 and the second port D 2Between B point voltage U 1B point voltage U 1Be the voltage that is carried in keyboard 101 two ends.
First end of second voltage detection module 314 is connected with the A point, and second end is connected with the B point, is used to detect A point and the voltage difference U between the B point between power supply 311 and the detection resistance 312 2Voltage difference U between A point and the B point 2Be and be carried in the voltage that detects resistance 312 two ends.
Button detection module 315 is according to U 1, U 2And R yCalculate the resistance R of said keyboard xResistance,
R x = U 1 U 2 × R y ; Wherein, R x = Σ i = 1 n R [ i ] ,
And with R xResistance with in advance the storage resistance value compare, according to R xResistance judge i button connection of keyboard.
According to ultimate principle of the present invention, third embodiment of the invention can also have multiple mapping mode, for example:
1) when the magnitude of voltage that detects power supply 311 output voltages is predefined steady state value, obtains U 1After the value, can be with the magnitude of voltage and the U that detect power supply 311 output voltages 1Value is subtracted each other and is obtained U 2Therefore value can omit second voltage detection module 314;
2) can calculate and store U in advance according to above-mentioned formula 1Value and U 2The mapping table of value and keyboard sequence number i is when detection obtains U 1Value and U 2During value, directly obtain keyboard sequence number i with lookup table mode; Perhaps
When the magnitude of voltage that detects power supply 311 output voltages is predefined steady state value, calculate and store U in advance 1The mapping table of value and keyboard sequence number i is when detection obtains U 1During value, directly obtain keyboard sequence number i with lookup table mode.
3) detect resistance 312 an end can with the second port D 2Link to each other, the other end links to each other with voltage tester reference Point C point, the two ends of first voltage detection module 313 respectively with the first port D 1And the second port D 2Link to each other; The two ends of second voltage detection module 314 link to each other with the two ends of detecting resistance 312 respectively.
More than with the situation of the key circuit quantity N=12 of keyboard 101 three preferred embodiments of the present invention have been described, but the present invention is not limited in the concrete form of this key circuit quantity and above-described three kinds of key press detecting circuits.The effect of button pick-up unit is the resistance value of calculation key dish 101, thereby compares through the current resistance value and the resistance value of storage in advance, thereby i button judging keyboard connected.
Visible from the foregoing description, the keyboard among the present invention adopts ways of connecting step by step, and when i button is pressed, when promptly i keyswitch was switched on, R had connected between first transmission line and second transmission line 1To R iBe total to i resistance, the resistance value of this keyboard is According to the resistance characteristics of this keyboard, the button pick-up unit can detect resistance and the current subscript value i that is in the keyswitch of on-state of magnitude of voltage detection that is carried in the keyboard two ends according to being carried in.
Keyboard of the present invention, button pick-up unit and electronic equipment simple in structure, detection method is convenient to be realized, only adopts two I/O interfaces, and can not cause the increase of I/O interface quantity owing to the increase of number of keys, is convenient to the expansion of keyboard capacity.
Further, further, the expansion of the number of keys of keyboard 101 of the present invention is simple.Particularly, suppose the keyboard 101 current i-1 of a having button, i=2,3 ..., n.When needs increase by 1 button again, need not the structure of current keyboard 101 is adjusted first end of i the key circuit that only need will increase and the resistance R of i-1 key circuit I-1Second end and keyswitch K I-1First end connect second end and keyswitch K iFirst end connect, and with keyswitch K iSecond end and the second transmission line S 2Connect and get final product.Expand convenient and simplely, and need not adjust, thereby reduce cost, strengthened versatility existing keyboard structure.
The above is merely preferred embodiment of the present invention, and is in order to restriction the present invention, not all within spirit of the present invention and principle, any modification of being made, is equal to replacement, improvement etc., all should be included within the scope that the present invention protects.

Claims (15)

1. a keyboard is characterized in that, comprising: be used for first transmission line and second transmission line that link to each other with the button pick-up unit, and be connected N key circuit between first transmission line and second transmission line, and N=1,2, i ..., n-1, n;
I key circuit comprises a resistance R i, and one and this resistance R iThe keyswitch K that is connected in series i
Wherein, the R of the 1st key circuit 1First end link to each other R with first transmission line 1Second end and K 1First end and the R of the 2nd key circuit 2First end link to each other K 1Second end link to each other with second transmission line,
The R of i key circuit iFirst end and the resistance R of i-1 key circuit I-1Second end and K I-1First end link to each other R iSecond end and keyswitch K iFirst end link to each other keyswitch K iSecond end be connected with second transmission line, i=2,3 ..., n.
2. keyboard according to claim 1 is characterized in that, said keyboard comprises 12 key circuits.
3. keyboard according to claim 2 is characterized in that R 1=82 Ω, R 2=100 Ω, R 3=120 Ω, R 4=150 Ω, R 5=180 Ω, R 6=220 Ω, R 7=300 Ω, R 8=430 Ω, R 9=680 Ω, R 10=1100 Ω, R 11=2200 Ω, R 12=6800 Ω.
4. button pick-up unit, the button that is used to detect keyboard is connected situation, it is characterized in that,
Said button pick-up unit comprises: first port, and second port detects power supply, detects resistance, first voltage detection module;
First port is used for being connected with first transmission line of said keyboard;
Second port is used for being connected with second transmission line of said keyboard;
Said detection resistance and detection power supply are connected between said first port and second port;
First voltage detection module, the branch pressure voltage value that is used to detect and export the branch pressure voltage value of said keyboard or detects and export said detection resistance;
The button detection module is used to receive the magnitude of voltage that first voltage detection module is exported, and detects the button connection situation of keyboard according to the magnitude of voltage of first voltage detection module output.
5. button pick-up unit according to claim 4 is characterized in that,
First end of said detection resistance links to each other with said first port or second port;
The two ends of said first voltage detection module link to each other with second port with said first port respectively, are used to detect and export the branch pressure voltage value of said keyboard.
6. button pick-up unit according to claim 4 is characterized in that,
First end of said detection resistance links to each other with said first port or second port;
The two ends of said first voltage detection module link to each other with the two ends of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance.
7. according to claim 5 or 6 described button pick-up units, it is characterized in that,
Also comprise in the said button pick-up unit: second voltage detection module;
First end of said detection resistance links to each other with said first port; The two ends of said second voltage detection module link to each other with said second port with second end of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance and said keyboard; Or first end of said detection resistance links to each other with said second port; The two ends of said second voltage detection module link to each other with said first port with second end of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance and said keyboard;
Said button detection module also is used to receive the magnitude of voltage of said second voltage detection module output, and detects the button connection situation of keyboard according to the magnitude of voltage that the magnitude of voltage and second voltage detection module of the output of first voltage detection module are exported.
8. button pick-up unit according to claim 5 is characterized in that,
Also comprise in the said button pick-up unit: second voltage detection module;
The two ends of said second voltage detection module link to each other with the two ends of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance;
Said button detection module also is used to receive the magnitude of voltage of said second voltage detection module output, and detects the button connection situation of keyboard according to the magnitude of voltage that the magnitude of voltage and second voltage detection module of the output of first voltage detection module are exported.
9. an electronic equipment comprises keyboard and button pick-up unit, it is characterized in that,
Said keyboard comprises: first transmission line and second transmission line, and be connected N key circuit between first transmission line and second transmission line, and N=1,2, i ..., n-1, n;
I key circuit comprises a resistance R i, and one and this resistance R iThe keyswitch K that is connected in series i
Wherein, the R of the 1st key circuit 1First end link to each other R with first transmission line 1Second end and K 1First end and the R of the 2nd key circuit 2First end link to each other K 1Second end link to each other with second transmission line,
The R of i key circuit iFirst end and the resistance R of i-1 key circuit I-1Second end and K I-1First end link to each other R iSecond end and keyswitch K iFirst end link to each other keyswitch K iSecond end be connected with second transmission line, i=2,3 ..., n;
Said button pick-up unit comprises: first port, and second port detects power supply, detects resistance, first voltage detection module;
First port is used for being connected with first transmission line of said keyboard;
Second port is used for being connected with second transmission line of said keyboard;
Said detection resistance and detection power supply are connected between said first port and second port;
First voltage detection module, the branch pressure voltage value that is used to detect and export the branch pressure voltage value of said keyboard or detects and export said detection resistance;
The button detection module is used to receive the magnitude of voltage that first voltage detection module is exported, and detects the button connection situation of keyboard according to the magnitude of voltage of first voltage detection module output.
10. electronic equipment according to claim 9 is characterized in that,
First end of said detection resistance links to each other with said first port or second port;
The two ends of said first voltage detection module link to each other with second port with said first port respectively, are used to detect and export the branch pressure voltage value of said keyboard.
11. electronic equipment according to claim 9 is characterized in that,
First end of said detection resistance links to each other with said first port or second port;
The two ends of said first voltage detection module link to each other with the two ends of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance.
12. according to claim 10 or 11 described electronic equipments, it is characterized in that,
Also comprise in the said button pick-up unit: second voltage detection module;
First end of said detection resistance links to each other with said first port; The two ends of said second voltage detection module link to each other with said second port with second end of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance and said keyboard; Or first end of said detection resistance links to each other with said second port; The two ends of said second voltage detection module link to each other with said first port with second end of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance and said keyboard;
Said button detection module also is used to receive the magnitude of voltage of said second voltage detection module output, and detects the button connection situation of keyboard according to the magnitude of voltage that the magnitude of voltage and second voltage detection module of the output of first voltage detection module are exported.
13. electronic equipment according to claim 10 is characterized in that,
Also comprise in the said button pick-up unit: second voltage detection module;
The two ends of said second voltage detection module link to each other with the two ends of said detection resistance respectively, are used to detect and export the branch pressure voltage value of said detection resistance;
Said button detection module also is used to receive the magnitude of voltage of said second voltage detection module output, and detects the button connection situation of keyboard according to the magnitude of voltage that the magnitude of voltage and second voltage detection module of the output of first voltage detection module are exported.
14. electronic equipment according to claim 9 is characterized in that, said keyboard comprises 12 key circuits.
15. electronic equipment according to claim 14 is characterized in that, R 1=82 Ω, R 2=100 Ω, R 3=120 Ω, R 4=150 Ω, R 5=180 Ω, R 6=220 Ω, R 7=300 Ω, R 8=430 Ω, R 9=680 Ω, R 10=1100 Ω, R 11=2200 Ω, R 12=6800 Ω.
CN2012102363585A 2012-07-09 2012-07-09 Keyboard, key detection device and electronic equipment Pending CN102789319A (en)

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CN113365178A (en) * 2021-04-28 2021-09-07 广东朝阳电子科技股份有限公司 Method for realizing input port expansion by sharing temperature detection port of Bluetooth headset
CN113365178B (en) * 2021-04-28 2022-09-30 广东朝阳电子科技股份有限公司 Method for realizing input port expansion by sharing temperature detection port of Bluetooth headset
CN113771779A (en) * 2021-09-13 2021-12-10 东风电驱动系统有限公司 Circuit for multifunctional keys of automobile

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Application publication date: 20121121