CN201667666U - Device for realizing mobile phone keyboard extension by utilizing analog-digital conversion - Google Patents
Device for realizing mobile phone keyboard extension by utilizing analog-digital conversion Download PDFInfo
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- CN201667666U CN201667666U CN2010201221206U CN201020122120U CN201667666U CN 201667666 U CN201667666 U CN 201667666U CN 2010201221206 U CN2010201221206 U CN 2010201221206U CN 201020122120 U CN201020122120 U CN 201020122120U CN 201667666 U CN201667666 U CN 201667666U
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- mobile phone
- voltage
- digital conversion
- button
- analog
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Abstract
The utility model relates to a device for realizing mobile phone keyboard extension by utilizing an analog-digital conversion, which comprises a mobile phone processor, a voltage comparator, a voltage dividing circuit and a button switch; when a button is on or off, the voltage dividing circuit outputs a voltage signal to the voltage comparator and a converter in a mobile phone; the output level of the voltage comparator produces a transition (interrupting signal) and informs a mobile processor chip of a button event; the converter in the mobile phone carries out analog-digital conversion to the voltage output by the voltage dividing circuit; and according to the conversion result parameters, an acting button is judged. The number of buttons which can be extended by the device is commonly decided by the conversion precision, power supply voltage and voltage dividing network precision of the converter in the mobile phone, and can conveniently realize volume increase and decrease by changing the circuit precision of all parts. The device for realizing mobile phone keyboard extension by utilizing the analog-digital conversion has the advantages of simple realization, high reliability, easily extendable button number and the like.
Description
Technical field
The utility model relates to a kind of electronic apparatus, relates in particular to a kind of device that utilizes analog-to-digital conversion to realize the cell phone keyboard expansion
Background technology
Mobile phone and landline telephone are most important two kinds of communication media of communication in the actual life.Along with development of times, the popularity rate of mobile phone is more and more higher, almost is one one of staff now, from single conversation and SMS to music, video, many-sided intelligent direction development such as Digital Video Broadcasting Handheld, full keyboard input, function is more and more perfect.
General conventional mobile phone process chip is only supported the restriction of about 30 buttons, when needs are supported full keyboard (64 key) or line control push-button scheme, must adopt the keyboard expanding unit, and general keyboard extended chip cost is higher, realizes complicated.This device utilizes the embedded in mobile phone D/A converting circuit, expands with low-cost, the high keyboard of realizing of reliability, has very high economic benefit and practical benefit.
Summary of the invention
At the deficiency of prior art, the purpose of this utility model is to realize with the embedded in mobile phone transducer expansion of number of keys, and submits the processor processing input information to by voltage comparator generation interrupt signal, realizes required function.
The described technical scheme of the utility model is as follows:
A kind of device that utilizes analog-to-digital conversion to realize the cell phone keyboard expansion is made up of button and bleeder circuit, embedded in mobile phone processor, voltage comparator.Bleeder circuit is converted to different voltage signals with the push of different key and is input to the embedded in mobile phone transducer, this voltage signal produces interrupt signal by voltage comparator and informs processor simultaneously, handset processes device control transformation device is converted to digital signal with input voltage, and by the definite button of digital signal, thereby realize the button input function.
The cell phone keyboard function that this device can be used for electronic equipment realizes or expansion.The quantity of expansion button is determined jointly by conversion accuracy, supply power voltage, the potential-divider network precision of embedded in mobile phone transducer, and by changing each several part circuit precision, the realization capacity enlarges and reduces easily.
The utlity model has realize simple, reliability is high, number of keys is advantage such as expansion easily.
Description of drawings
Fig. 1 is the utility model system block diagram;
Fig. 2 is the utility model applicating example schematic diagram.
The number in the figure explanation
1-processor 2-voltage comparator 3-button and bleeder circuit
Embodiment
Below in conjunction with accompanying drawing, further specify the utility model and how to realize:
Embodiment
As shown in Figure 1, when a certain button is pressed, bleeder circuit 3 is converted to different voltage signals with the push of different key and is input to embedded in mobile phone AD (modulus) transducer, this voltage signal produces interrupt signal EINT_KEY by voltage comparator 2 and informs handset processes device 1 simultaneously, handset processes device 1 control AD (modulus) transducer is converted to digital signal with input voltage, and by the definite button of digital signal, thereby realize the cell phone keyboard input function.
As shown in Figure 2, be practical application example schematic of the present utility model, VDD is direct current supply, SW1, SW2, SW3, SW4, SW5, SWN are key switch; R1, R2, R3, R4, R5, RN are divider resistance, each resistance is determined as calculated according to the requirement that 0.1V increases progressively, when supposing that SW3 presses, ADC_KEY will export 0.2V voltage, simultaneously voltage comparator output EINT_KEY by the high level saltus step to low level, this signal is as the interruption input signal of handset processes device, handset processes device 1 starts interrupt handling routine, control built-in AD (modulus) transducer the aanalogvoltage of ADC_KEY is converted to digital signal, handset processes device 1 is judged button according to digital signal.When VDD elects 2.8V as, incremental voltage 0.1V during embedded in mobile phone AD (modulus) transducer precision 0.04V, can expand 28 buttons at most.
Claims (3)
1. a device that utilizes analog-to-digital conversion to realize the cell phone keyboard expansion comprises processor, voltage comparator, bleeder circuit and key switch, and it is characterized in that: described handset processes device is connected with voltage comparator, bleeder circuit, key switch respectively.
2. a kind of device that utilizes analog-to-digital conversion to realize the cell phone keyboard expansion according to claim 1, it is characterized in that: described bleeder circuit is converted to different voltage signals with different key and is input to the embedded in mobile phone transducer.
3. a kind of device that utilizes analog-to-digital conversion to realize the cell phone keyboard expansion according to claim 1, it is characterized in that: described handset processes device control transformation device is converted to digital signal with input voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201221206U CN201667666U (en) | 2010-03-03 | 2010-03-03 | Device for realizing mobile phone keyboard extension by utilizing analog-digital conversion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201221206U CN201667666U (en) | 2010-03-03 | 2010-03-03 | Device for realizing mobile phone keyboard extension by utilizing analog-digital conversion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201667666U true CN201667666U (en) | 2010-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201221206U Expired - Lifetime CN201667666U (en) | 2010-03-03 | 2010-03-03 | Device for realizing mobile phone keyboard extension by utilizing analog-digital conversion |
Country Status (1)
| Country | Link |
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| CN (1) | CN201667666U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843143A (en) * | 2011-06-23 | 2012-12-26 | 嘉兴淳祥电子科技有限公司 | Analog-digital conversion type keyboard |
| CN103067547A (en) * | 2011-10-20 | 2013-04-24 | 联芯科技有限公司 | Mobile terminal input device and mobile terminal input method |
| CN113581334A (en) * | 2021-09-07 | 2021-11-02 | 重庆隆鑫新能源科技有限公司 | Control circuit combination and motorcycle |
| US11463091B2 (en) | 2018-12-13 | 2022-10-04 | Razer (Asia-Pacific) Pte. Ltd. | Analog input device, computing system and method for receiving and processing analog input |
-
2010
- 2010-03-03 CN CN2010201221206U patent/CN201667666U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102843143A (en) * | 2011-06-23 | 2012-12-26 | 嘉兴淳祥电子科技有限公司 | Analog-digital conversion type keyboard |
| CN103067547A (en) * | 2011-10-20 | 2013-04-24 | 联芯科技有限公司 | Mobile terminal input device and mobile terminal input method |
| US11463091B2 (en) | 2018-12-13 | 2022-10-04 | Razer (Asia-Pacific) Pte. Ltd. | Analog input device, computing system and method for receiving and processing analog input |
| US11863175B2 (en) | 2018-12-13 | 2024-01-02 | Cisco Technology, Inc. | Analog input device, computing system and method for receiving and processing analog input |
| US11955966B2 (en) | 2018-12-13 | 2024-04-09 | Razer (Asia-Pacific) Pte. Ltd. | Analog input device, computing system and method for receiving and processing analog input |
| CN113581334A (en) * | 2021-09-07 | 2021-11-02 | 重庆隆鑫新能源科技有限公司 | Control circuit combination and motorcycle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101208 |
|
| CX01 | Expiry of patent term |