CN112188666A - Multi-LED driving and multi-key pin multiplexing circuit and control method thereof - Google Patents
Multi-LED driving and multi-key pin multiplexing circuit and control method thereof Download PDFInfo
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- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
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Abstract
The invention provides a multi-LED driving and multi-key pin multiplexing circuit and a control method thereof, wherein the circuit comprises an integrated chip unit, a key unit and an LED lamp unit, the integrated chip unit is provided with a plurality of pin multiplexing circuits and control signal input terminals for inputting periodic control signals to the plurality of pin multiplexing circuits, the pin multiplexing circuits are provided with an input and output pin circuit for LED lamp switch control and key input multiplexing, and the plurality of pin multiplexing circuits are respectively connected to the key unit and the LED lamp unit through the input and output pin circuit. The method of the present invention is applied to the above-described circuit. The invention can detect a plurality of keys and drive a plurality of LED lamps with low cost, saves a plurality of pins and greatly reduces the packaging volume and the cost of a chip.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a multi-LED driving and multi-key pin multiplexing circuit and a control method applied to the circuit.
Background
For control chips of many intelligent hardware devices, in order to achieve rich and flexible human-computer interaction, more pin resources are required to control various input and output signals, including key input and lamp control output.
However, the micro device has higher requirements on the size of the chip and the number of pins of the chip; or some low cost solution, it is also desirable to have the chip pin count as small as possible. To realize rich functions and a small number of pins, some innovative functional multiplexing methods must be used to design the pins.
Disclosure of Invention
The invention mainly aims to provide a multi-LED driving and multi-key pin multiplexing circuit which is low in cost and can detect a plurality of keys and drive a plurality of LED lamps.
Another objective of the present invention is to provide a control method of a multi-LED driving and multi-key pin multiplexing circuit capable of detecting a plurality of combination keys and driving a plurality of LED lamps at low cost.
In order to achieve the above main object, the present invention provides a multi-LED driving and multi-key pin multiplexing circuit, which includes an integrated chip unit, a key unit and an LED lamp unit, wherein the integrated chip unit has a plurality of pin multiplexing circuits and control signal input terminals for inputting periodic control signals to the plurality of pin multiplexing circuits, the pin multiplexing circuit has an input/output pin circuit for LED lamp switching control and key input multiplexing, and the plurality of pin multiplexing circuits are respectively connected to the key unit and the LED lamp unit through the input/output pin circuit.
In a further scheme, the integrated chip unit is provided with three pin multiplexing circuits, and the integrated chip unit drives six LED lamps of the LED lamp unit and three keys of the key unit through the three pin multiplexing circuits.
In a further scheme, the pin multiplexing circuit comprises an LED drive control circuit, a key detection circuit and an input/output pin circuit, wherein a first end of the LED drive control circuit is connected to a chip power supply end, a second end of the LED drive control circuit is connected to the input/output pin circuit, three ends of the LED drive control circuit are connected to an LED drive voltage signal, a first end of the key detection circuit is connected to the chip power supply end, a second end of the key detection circuit is connected to the input/output pin circuit, and a third end of the key detection circuit is connected to a key detection signal.
In a further scheme, the key unit includes a first key, a second key, and a third key, control ends of the first key, the second key, and the third key are sequentially connected to three third ends of the key detection circuit, first ends of the first key, the second key, and the third key are respectively grounded, and second ends of the first key, the second key, and the third key are sequentially connected to three input/output pin circuits of the pin multiplexing circuit.
In a further scheme, the LED lamp unit includes a first LED lamp, a second LED lamp, a third LED lamp, a fourth LED lamp, a fifth LED lamp, and a sixth LED lamp, a negative electrode of the first LED lamp is connected to the node 1, a positive electrode of the first LED lamp is connected to the node 5, a negative electrode of the second LED lamp is connected to the node 5, a positive electrode of the second LED lamp is connected to the node 9, a positive electrode of the third LED lamp is connected to the node 4, a negative electrode of the third LED lamp is connected to the node 6, a positive electrode of the fourth LED lamp is connected to the node 6, a negative electrode of the fourth LED lamp is connected to the node 10, a negative electrode of the fifth LED lamp is connected to the node 8, a positive electrode of the fifth LED lamp is connected to the node 2, and a negative electrode of the sixth LED lamp is connected to the node 8.
In a further scheme, the first pin multiplexing circuit includes a first LED driving control circuit, a first key detection circuit, and a first input/output pin circuit, a first end of the first LED driving control circuit is connected to a chip power supply terminal, a second end of the first LED driving control circuit is connected to the first input/output pin circuit, three ends of the first LED driving control circuit are connected to an LED driving voltage signal, a first end of the first key detection circuit is connected to the chip power supply terminal, a second end of the first key detection circuit is connected to the first input/output pin circuit, and a third end of the first key detection circuit is connected to a key detection signal.
In a further scheme, the second pin multiplexing circuit includes a second LED driving control circuit, a second key detection circuit, and a second input/output pin circuit, a first end of the second LED driving control circuit is connected to the chip power supply terminal, a second end of the second LED driving control circuit is connected to the second input/output pin circuit, a third end of the second LED driving control circuit is connected to the LED driving voltage signal, a first end of the second key detection circuit is connected to the chip power supply terminal, a second end of the second key detection circuit is connected to the second input/output pin circuit, and a third end of the second key detection circuit is connected to the key detection signal.
In a further scheme, the third pin multiplexing circuit includes a third LED driving control circuit, a third key detection circuit, and a third input/output pin circuit, a first end of the third LED driving control circuit is connected to the chip power supply terminal, a second end of the third LED driving control circuit is connected to the third input/output pin circuit, a third end of the third LED driving control circuit is connected to the LED driving voltage signal, a first end of the third key detection circuit is connected to the chip power supply terminal, a second end of the third key detection circuit is connected to the third input/output pin circuit, and a third end of the third key detection circuit is connected to the key detection signal.
In order to achieve the above another object, the present invention provides a method for controlling a multi-LED driving and multi-key pin multiplexing circuit, where the multi-LED driving and multi-key pin multiplexing circuit adopts the above multi-LED driving and multi-key pin multiplexing circuit, and the method includes the following steps: a periodic control signal for time division multiplexing control of the pin multiplexing circuit is input from a control signal input terminal, wherein the periodic control signal comprises an LED lamp control time period and a key detection time period; in the LED lamp control time period, the multiplexing circuit works in an illumination control state through a level control pin of a periodic control signal, and an LED lamp control signal for switching and controlling the LED lamp unit to be switched on and off is output according to the illumination control signal; and in the key detection time period, the pin multiplexing circuit is controlled to work in a key input detection state through the level of the periodic control signal, and external key input is converted into a key output signal.
In a further scheme, the multiplexing circuit works in an illumination control state through a level control pin of a periodic control signal in an LED lamp control time period, and LED lamp control signals of six LED lamps for controlling the LED lamp unit to be switched on and switched off are output according to the illumination control signal; and in the key detection time period, the pin multiplexing circuit is controlled to work in a key input detection state through the level of the periodic control signal, and external key input is converted into key output signals of three keys of the key unit.
Therefore, the pin multiplexing circuit provided by the invention can realize the control of 6 LED lamps and the detection of 3 keys by using 3 pins through controlling different states of the built-in LDO chip and switching and controlling the input and output states of the pins according to the designed time slot, and compared with the conventional method which needs 9 pins, the pin multiplexing circuit saves more pins and greatly reduces the packaging volume and the cost of the chip.
Drawings
FIG. 1 is a schematic diagram of an embodiment of a multi-LED driver and multi-key pin multiplexing circuit of the present invention.
FIG. 2 is a schematic circuit diagram of a multi-pin multiplexing circuit in an embodiment of a multi-LED driver and multi-key pin multiplexing circuit of the present invention.
Fig. 3 is a schematic circuit diagram of a first pin multiplexing circuit in an embodiment of a multi-LED driver and multi-key pin multiplexing circuit of the present invention.
Fig. 4 is a schematic diagram of one refresh cycle during an LED lamp control period in an embodiment of a multi-LED driver and multi-key pin multiplexing circuit of the present invention.
Fig. 5 is a schematic diagram of a lighting time slot of an LED lamp in an embodiment of the multi-LED driving and multi-key pin multiplexing circuit of the invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
The embodiment of the multiplexing circuit of the multi-LED driving and multi-key pin comprises the following steps:
referring to fig. 1 to 3, the multi-LED driving and multi-key pin multiplexing circuit of the present invention includes an integrated chip unit, a key unit, and an LED lamp unit, the integrated chip unit has a plurality of pin multiplexing circuits and a control signal input terminal for inputting a periodic control signal to the plurality of pin multiplexing circuits, the pin multiplexing circuits have an input/output pin circuit for LED lamp on/off control and key input multiplexing, and the plurality of pin multiplexing circuits are respectively connected to the key unit and the LED lamp unit through the input/output pin circuit.
In the present embodiment, the ic unit has three pin multiplexing circuits, such as an LC0 pin multiplexing circuit, an LC1 pin multiplexing circuit, and an LC2 pin multiplexing circuit, and the ic unit drives six LED lamps of the LED lamp unit and three keys of the key unit through the three pin multiplexing circuits.
In this embodiment, the pin multiplexing circuit includes an LED driving control circuit, a key detection circuit, and an input/output pin circuit, a first end of the LED driving control circuit is connected to the chip power supply terminal, a second end of the LED driving control circuit is connected to the input/output pin circuit, a third end of the LED driving control circuit is connected to the LED driving voltage signal, a first end of the key detection circuit is connected to the chip power supply terminal, a second end of the key detection circuit is connected to the input/output pin circuit, and a third end of the key detection circuit is connected to the key detection signal.
The LED driving control circuit comprises a voltage division driving circuit and an LED driving circuit used for receiving an LED driving voltage selection signal, a universal LDO circuit (such as a low-voltage linear voltage regulator) provides 3.1V stable voltage, the voltage division driving circuit divides the voltage into 1.55V by adopting two resistors with the same size, the LED driving circuit is an LED driving control special circuit, and an MCU digital interface, a data latch, an LED high-voltage driving circuit and the like are integrated in the LED driving control special circuit.
The key detection circuit comprises a resistance voltage division circuit and a voltage comparator, wherein the input end of the resistance voltage division circuit is connected with the stable voltage provided by the LDO circuit, the output end of the resistance voltage division circuit is connected with the input and output pin circuit, one input end of the voltage comparator is connected with the input and output pin circuit, and the other input end of the voltage comparator is used for comparing a threshold VkeythAnd the output end outputs a key judgment result signal.
The input and output pin circuit is a general purpose GPIO circuit.
In this embodiment, the key unit includes a first key SW1, a second key SW2, and a third key SW3, wherein control terminals of the first key SW1, the second key SW2, and the third key SW3 are sequentially connected to third terminals of the three key detection circuits, first terminals of the first key SW1, the second key SW2, and the third key SW3 are respectively grounded, and second terminals of the first key SW1, the second key SW2, and the third key SW3 are sequentially connected to input/output pin circuits of the three pin multiplexing circuits.
In this embodiment, the LED lamp unit includes a first LED lamp (LED1), a second LED lamp (LED2), a third LED lamp (LED3), a fourth LED lamp (LED4), a fifth LED lamp (LED5), a sixth LED lamp (LED6), a cathode of the first LED lamp is connected to the node 1, an anode of the first LED lamp is connected to the node 5, a cathode of the second LED lamp is connected to the node 9, an anode of the third LED lamp is connected to the node 4, a cathode of the third LED lamp is connected to the node 6, an anode of the fourth LED lamp is connected to the node 6, a cathode of the fourth LED lamp is connected to the node 10, a cathode of the fifth LED lamp is connected to the node, an anode of the fifth LED lamp is connected to the node 8, an anode of the sixth LED lamp is connected to the node 2, and a cathode of the sixth LED lamp is connected to the node 8.
Specifically, the first pin multiplexing circuit (for example, the LC0 pin multiplexing circuit 100) includes a first LED driving control circuit 10, a first key detection circuit 11, and a first input/output pin circuit 12, a first end of the first LED driving control circuit 10 is connected to a chip power supply terminal, a second end of the first LED driving control circuit 10 is connected to the first input/output pin circuit 12, a third end of the first LED driving control circuit 10 is connected to an LED driving voltage signal, a first end of the first key detection circuit 11 is connected to the chip power supply terminal, a second end of the first key detection circuit 11 is connected to the first input/output pin circuit 12, and a third end of the first key detection circuit 11 is connected to a key detection signal.
Specifically, the second pin multiplexing circuit (e.g., the LC1 pin multiplexing circuit) includes a second LED driving control circuit 20, a second key detection circuit 21, and a second input/output pin circuit 22, a first end of the second LED driving control circuit 20 is connected to the chip power supply terminal, a second end of the second LED driving control circuit 20 is connected to the second input/output pin circuit 22, a third end of the second LED driving control circuit 20 is connected to the LED driving voltage signal, a first end of the second key detection circuit 21 is connected to the chip power supply terminal, a second end of the second key detection circuit 21 is connected to the second input/output pin circuit 22, and a third end of the second key detection circuit 21 is connected to the key detection signal.
Specifically, the third pin multiplexing circuit (for example, the LC2 pin multiplexing circuit) includes a third LED driving control circuit 30, a third key detection circuit 31, and a third input/output pin circuit 32, a first end of the third LED driving control circuit 30 is connected to the chip power supply terminal, a second end of the third LED driving control circuit 30 is connected to the third input/output pin circuit 32, a third end of the third LED driving control circuit 30 is connected to the LED driving voltage signal, a first end of the third key detection circuit 31 is connected to the chip power supply terminal, a second end of the third key detection circuit 31 is connected to the third input/output pin circuit 32, and a third end of the third key detection circuit 31 is connected to the key detection signal.
The output terminals of the first pin circuit 12, the second pin circuit 22 and the third pin circuit 32 are LC0, LC1 and LC2, respectively.
In practical application, the LED driving control of this embodiment is completed by outputting appropriate voltage and current through the chip pins, including turning on and off of the LED, brightness intensity, and the like.
According to the principle of LED lamp light emission, an LED has an afterglow effect, that is, the LED keeps emitting light for a certain time even if voltage and current are not supplied all the time. For example, if the appropriate voltage current is supplied to drive the LED 60 times at intervals of one second, no significant change in luminance is seen, and afterglow of the LED remains during the period in which no driving is supplied.
The key detection is to input the level generated during key pressing to the chip pin, then to perform detection for a while, and if the level is maintained, then to consider that the key is pressed.
If the pins of the chip can be switched between the output mode and the input mode within a certain period, and corresponding voltage and current can be provided in the output time slot, and corresponding voltage is detected in the input time slot, the functions of LED drive control and key detection can be multiplexed on the pins.
In addition, by utilizing the characteristics of the LED, a positive voltage higher than a threshold value can be lightened only by simultaneously providing current drive, and the current can not be lightened only when the positive voltage is lower than the threshold value (the voltage is too low, or the voltages of the anode and the cathode are opposite) or the current is too small, so that a mode that a plurality of pins are independently switched at different voltage gears can be designed to manufacture different voltage ranges, and the on-off of a plurality of LED lamps can be controlled, and not only one pin controls one LED.
The embodiment of a control method of a multi-LED driving and multi-key pin multiplexing circuit comprises the following steps:
a control method of a multi-LED drive and multi-key pin multiplexing circuit is applied to the multi-LED drive and multi-key pin multiplexing circuit, and the method comprises the following steps: a periodic control signal for time division multiplexing control of the pin multiplexing circuit is input from the control signal input terminal, wherein the periodic control signal comprises an LED lamp control time period and a key detection time period; in the LED lamp control time period, the multiplexing circuit works in an illumination control state through a level control pin of a periodic control signal, and an LED lamp control signal for switching and controlling the LED lamp unit to be switched on and off is output according to the illumination control signal; and in the key detection time period, the pin multiplexing circuit is controlled to work in a key input detection state through the level of the periodic control signal, and external key input is converted into a key output signal.
Furthermore, in the LED lamp control time period, the pin multiplexing circuit is controlled to work in an illumination control state through the level of the periodic control signal, and LED lamp control signals of six LED lamps for controlling the LED lamp unit to be switched on and switched off are output according to the illumination control signal; and in the key detection time period, the pin multiplexing circuit is controlled to work in a key input detection state through the level of the periodic control signal, and external key input is converted into key output signals of three keys of the key unit.
In practical application, the requirements of different LED lamps on the breakover voltage are comprehensively considered,define 3 levels: h (e.g. 3.1V), L (0V), Mp(H/2, 1.55V), as shown in the table (I), the technical scheme of controlling 6 LED lamps by 3 chip pins is elaborated.
Watch 1
In the present embodiment, an afterglow effect of the LED is used, and one of the technologies is to drive a plurality of lamps in a time-sharing manner. If 6 LED lamps as shown in fig. 1 need to be driven, in the LED lamp control time period, one refresh cycle is divided into 6 lighting time slots, and each time slot is responsible for lighting one LED lamp (LED 1-LED 6). The LC0, LC1, LC2 are configured to output the above 3 levels according to the lighting requirements. One refresh cycle is shown in fig. 4.
In the present embodiment, in order to maintain the lighting effect, it is necessary to ensure the duration of each lighting time slot in one refresh period by chip internal sequential circuit design so that the refresh period in 1S exceeds 60 periods.
Meanwhile, in each lighting time slot, 3 chip pins are configured to output different states according to the requirements of lighting or lighting-out, as shown in table (two):
watch 2
In practical application, the technical scheme of controlling the LED driving and key multiplexing by 3 chip pins is elaborated, and on the basis of the method for driving 6 LED lamps by 3 chip pins, 3 pins are also required to be multiplexed to detect 3 keys, so that the pin states need to be increased, as shown in table (iii):
watch (III)
Where Mw is an intermediate level state of weak driving ability and can be pulled down by the key resistance when the key is pressed.
In the key detection period, a key detection sub-slot is required to be included in each of the 3 chip pins. Wherein, 3 pins are all in input state in the key detection time slot, the inside will be pulled up to the Mw grade level through a resistance of 20Kohm, if it is detected that the pin voltage is less than a certain threshold (for example, 0.3V) will consider that there is a key action, finally, the circuit logic judges whether there is a key press according to the identification of continuous key action, thereby realizing that 3 pins detect 3 keys.
In the LED lamp control time period, one lighting time slot of the LED lamp is as shown in fig. 5, and one refresh cycle is as shown in fig. 4, in order to maintain the lighting effect and the key detection at the same time, so that the refresh exceeds 60 cycles in 1S and the minimum 20-60 capture times of the key input detection are enough, each time slot is defined to be 2-5 mS, wherein the Tb sub-time slot of the key detection occupies 25%.
Specifically, the time period includes a time for lighting and a time for detecting a key. If there are more than 60 refreshes (the number of times of lamp refreshes is also the number of times of key detection) within 1s and there are 6 LED lamps in this embodiment, 1000/60/6 is about 2.7ms, which is the maximum timeslot time. Assuming that the time slot of the spot light is defined to be 2ms, the sub-time slot of the detection key, namely Tb, accounts for 25 percent, namely 0.5ms, and the time can meet the minimum requirement of key detection; the sub-slot of the ignition, i.e. Ta, is about 1.5 ms.
Therefore, the pin multiplexing circuit provided by the invention can realize the control of 6 LED lamps and the detection of 3 keys by using 3 pins through controlling different states of the built-in LDO chip and switching and controlling the input and output states of the pins according to the designed time slot, and compared with the conventional method which needs 9 pins, the pin multiplexing circuit saves more pins and greatly reduces the packaging volume and the cost of the chip.
It should be noted that the above is only a preferred embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept also fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a many LED drive and many button pin multiplex circuit, includes integrated chip unit, button unit and LED lamp unit, its characterized in that:
the integrated chip unit is provided with a plurality of pin multiplexing circuits and control signal input terminals for inputting periodic control signals to the plurality of pin multiplexing circuits, the pin multiplexing circuits are provided with an input and output pin circuit for LED lamp switch control and key input multiplexing, and the plurality of pin multiplexing circuits are respectively connected to the key unit and the LED lamp unit through the input and output pin circuit.
2. The multi-LED driver and multi-key pin multiplexing circuit of claim 1, wherein:
the integrated chip unit is provided with three pin multiplexing circuits, and the integrated chip unit drives six LED lamps of the LED lamp unit and three keys of the key unit through the three pin multiplexing circuits.
3. The multi-LED driver and multi-key pin multiplexing circuit of claim 2, wherein:
the pin multiplexing circuit comprises an LED drive control circuit, a key detection circuit and an input and output pin circuit, wherein the first end of the LED drive control circuit is connected with a chip power supply end, the second end of the LED drive control circuit is connected with the input and output pin circuit, the three ends of the LED drive control circuit are connected with an LED drive voltage signal, the first end of the key detection circuit is connected with the chip power supply end, the second end of the key detection circuit is connected with the input and output pin circuit, and the third end of the key detection circuit is connected with a key detection signal.
4. The multi-LED driver and multi-key pin multiplexing circuit of claim 3, wherein:
the key unit comprises a first key, a second key and a third key, wherein the control ends of the first key, the second key and the third key are sequentially connected to the third ends of the three key detection circuits, the first ends of the first key, the second key and the third key are respectively grounded, and the second ends of the first key, the second key and the third key are sequentially connected to the input and output pin circuits of the three pin multiplexing circuits.
5. The multi-LED driver and multi-key pin multiplexing circuit of claim 3, wherein:
the LED lamp unit comprises a first LED lamp, a second LED lamp, a third LED lamp, a fourth LED lamp, a fifth LED lamp and a sixth LED lamp, wherein the negative electrode of the first LED lamp is connected to a node 1, the positive electrode of the first LED lamp is connected to a node 5, the negative electrode of the second LED lamp is connected to the node 5, the positive electrode of the second LED lamp is connected to a node 9, the positive electrode of the third LED lamp is connected to a node 4, the negative electrode of the third LED lamp is connected to a node 6, the positive electrode of the fourth LED lamp is connected to the node 6, the negative electrode of the fourth LED lamp is connected to a node 10, the negative electrode of the fifth LED lamp is connected to a node 8, the positive electrode of the sixth LED lamp is connected to a node 2, and the negative electrode of the sixth LED lamp is connected to a node 8.
6. The multi-LED driver and multi-key pin multiplexing circuit of any one of claims 1 to 5, wherein:
the first pin multiplexing circuit comprises a first LED drive control circuit, a first key detection circuit and a first input/output pin circuit, wherein the first end of the first LED drive control circuit is connected with a chip power supply end, the second end of the first LED drive control circuit is connected with the first input/output pin circuit, the three ends of the first LED drive control circuit are connected with LED drive voltage signals, the first end of the first key detection circuit is connected with the chip power supply end, the second end of the first key detection circuit is connected with the first input/output pin circuit, and the third end of the first key detection circuit is connected with key detection signals.
7. The multi-LED driver and multi-key pin multiplexing circuit of claim 6, wherein:
the second pin multiplexing circuit comprises a second LED drive control circuit, a second key detection circuit and a second input/output pin circuit, wherein the first end of the second LED drive control circuit is connected with a chip power supply end, the second end of the second LED drive control circuit is connected with the second input/output pin circuit, the three ends of the second LED drive control circuit are connected with an LED drive voltage signal, the first end of the second key detection circuit is connected with the chip power supply end, the second end of the second key detection circuit is connected with the second input/output pin circuit, and the third end of the second key detection circuit is connected with a key detection signal.
8. The multi-LED driver and multi-key pin multiplexing circuit of claim 7, wherein:
the third pin multiplexing circuit comprises a third LED drive control circuit, a third key detection circuit and a third input/output pin circuit, wherein the first end of the third LED drive control circuit is connected with the chip power supply end, the second end of the third LED drive control circuit is connected with the third input/output pin circuit, the third end of the third LED drive control circuit is connected with an LED drive voltage signal, the first end of the third key detection circuit is connected with the chip power supply end, the second end of the third key detection circuit is connected with the third input/output pin circuit, and the third end of the third key detection circuit is connected with a key detection signal.
9. A method for controlling a multi-LED driver and multi-key pin multiplexing circuit, wherein the multi-LED driver and multi-key pin multiplexing circuit is the multi-LED driver and multi-key pin multiplexing circuit of any one of claims 1 to 8, the method comprising the steps of:
a periodic control signal for time division multiplexing control of the pin multiplexing circuit is input from a control signal input terminal, wherein the periodic control signal comprises an LED lamp control time period and a key detection time period;
in the LED lamp control time period, the multiplexing circuit works in an illumination control state through a level control pin of a periodic control signal, and an LED lamp control signal for switching and controlling the LED lamp unit to be switched on and off is output according to the illumination control signal;
and in the key detection time period, the pin multiplexing circuit is controlled to work in a key input detection state through the level of the periodic control signal, and external key input is converted into a key output signal.
10. The control method according to claim 9, characterized in that:
in the LED lamp control time period, the multiplexing circuit works in an illumination control state through a level control pin of a periodic control signal, and LED lamp control signals of six LED lamps for controlling the LED lamp unit to be switched on and switched off are output according to the illumination control signal;
and in the key detection time period, the pin multiplexing circuit is controlled to work in a key input detection state through the level of the periodic control signal, and external key input is converted into key output signals of three keys of the key unit.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054982A (en) * | 2021-03-25 | 2021-06-29 | 深圳前海维晟智能技术有限公司 | Capacitive touch key circuit with LED display device multiplexing control pin |
| CN113541277A (en) * | 2021-09-16 | 2021-10-22 | 深圳英集芯科技股份有限公司 | Control chip and bluetooth headset charging device |
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2020
- 2020-11-06 CN CN202011232108.5A patent/CN112188666A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113054982A (en) * | 2021-03-25 | 2021-06-29 | 深圳前海维晟智能技术有限公司 | Capacitive touch key circuit with LED display device multiplexing control pin |
| CN113541277A (en) * | 2021-09-16 | 2021-10-22 | 深圳英集芯科技股份有限公司 | Control chip and bluetooth headset charging device |
| WO2023040654A1 (en) * | 2021-09-16 | 2023-03-23 | 深圳英集芯科技股份有限公司 | Control chip and bluetooth headset charging device |
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