CN113055780A - Parallel input port expansion circuit sharing temperature detection port of Bluetooth headset - Google Patents
Parallel input port expansion circuit sharing temperature detection port of Bluetooth headset Download PDFInfo
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- CN113055780A CN113055780A CN202110359753.1A CN202110359753A CN113055780A CN 113055780 A CN113055780 A CN 113055780A CN 202110359753 A CN202110359753 A CN 202110359753A CN 113055780 A CN113055780 A CN 113055780A
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- temperature detection
- parallel branch
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
- H04R1/1041—Mechanical or electronic switches, or control elements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2201/00—Details of transducers, loudspeakers or microphones covered by H04R1/00 but not provided for in any of its subgroups
- H04R2201/10—Details of earpieces, attachments therefor, earphones or monophonic headphones covered by H04R1/10 but not provided for in any of its subgroups
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
Abstract
The invention relates to a parallel input port expansion circuit sharing a temperature detection port of a Bluetooth headset, which comprises a pull-up resistor, a temperature detection circuit and a function expansion circuit, wherein the temperature detection circuit and the function expansion circuit are connected and form a voltage division node which is commonly connected with a temperature detection pin of a Bluetooth main control chip, and a second resistor connecting end of the pull-up resistor is connected with the voltage division node; the function expansion circuit comprises a first parallel branch, a second parallel branch and a third parallel branch which are connected between a grounding end and a voltage division node in parallel; each parallel branch and pull-up resistor divide voltage to realize that an input port can receive a plurality of function inputs behind its temperature detection pin of sharing bluetooth master control chip, realize the port extension promptly, for the bluetooth chip of selecting more ports or increasing port extension chip, the cost is cheap, in addition, any parallel branch goes wrong, can not influence the normal use of other functions yet.
Description
Technical Field
The invention relates to the technical field of input port expansion circuits of Bluetooth earphones, in particular to a parallel input port expansion circuit sharing a temperature detection port of a Bluetooth earphone.
Background
With the 3.5 audio interface of the mobile phone being cancelled, the Bluetooth headset is more and more fierce in competition, and the cost of the Bluetooth headset is reduced. Many bluetooth main control chips are reduced to the limit in order to reduce the cost, and the available input/output control interfaces are limited, and are generally within 8 interfaces. When the whole bluetooth headset is designed, in order to gain cost advantages, the cheapest main chip is usually selected, but software upgrading, three-color LEDs, ambient temperature monitoring, three/four keys, hall magnetic attraction and other functions become standard configurations of the current bluetooth headset, and at least 10 input/output control interfaces are needed for realizing all the functions conventionally. Contrary to the cost reduction, the bluetooth control chip or the port expansion chip with more ports is selected, which means the cost is increased. There is a need for a cost effective circuit to solve the problem of port expansion.
Therefore, in the present patent application, the applicant has elaborately studied a parallel input port expansion circuit sharing a temperature detection port of a bluetooth headset to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and mainly aims to provide a parallel input port expansion circuit sharing a temperature detection port of a Bluetooth headset.
In order to achieve the purpose, the invention adopts the following technical scheme:
a parallel input port expansion circuit sharing a temperature detection port of a Bluetooth headset comprises a pull-up resistor, a temperature detection circuit and a function expansion circuit, wherein the temperature detection circuit and the function expansion circuit are connected and form a voltage division node which is commonly connected with a temperature detection pin of a Bluetooth main control chip;
the temperature detection circuit comprises a thermistor NTC and a filter capacitor C1, the first resistor connecting end is grounded through the thermistor NTC, and the voltage division node is grounded through a filter capacitor C1;
the function expansion circuit comprises a first parallel branch, a second parallel branch and a third parallel branch which are connected between a grounding end and a voltage division node in parallel;
the first parallel branch comprises a first key and a first resistor, and the first key and the first resistor are connected in series and then connected in parallel between a grounding end and a voltage division node;
the second parallel branch comprises a switch tube and a second resistor, the switch tube is provided with a first switch tube connecting end, a control end used for connecting a push-pull circuit and a second switch tube connecting end used for grounding, and the first switch tube connecting end of the switch tube is connected with a voltage division node after being connected with the second resistor in series;
the third parallel branch comprises a third resistor and a first connecting end used for connecting a low potential output end of the open leakage circuit, the first connecting end is connected with a voltage division node after being connected with the third resistor in series, and the resistance values of the first resistor, the second resistor and the third resistor are different.
As a preferred scheme, the function expansion circuit further includes a fourth parallel branch connected in parallel between the ground terminal and the voltage dividing node, the fourth parallel branch includes a second key and a fourth resistor, the second key and the fourth resistor are connected in series and then connected in parallel between the ground terminal and the voltage dividing node, and the first resistor, the second resistor, the third resistor and the fourth resistor have different resistances.
As a preferable scheme, the function expansion circuit further includes a fifth parallel branch connected in parallel between the ground terminal and the voltage dividing node, the fifth parallel branch includes a third key and a fifth resistor, the third key and the fifth resistor are connected in series and then connected in parallel between the ground terminal and the voltage dividing node, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, and the fifth resistor are all different.
As a preferred scheme, the function expansion circuit further includes a sixth parallel branch connected in parallel between the ground terminal and the voltage dividing node, the sixth parallel branch includes a fourth key and a sixth resistor, the fourth key and the sixth resistor are connected in series and then connected in parallel between the ground terminal and the voltage dividing node, and the resistances of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, and the sixth resistor are different.
Preferably, the temperature detection circuit comprises a thermistor NTC and a filter capacitor C1, the first resistor connection terminal is grounded through the thermistor NTC, and the voltage division node is grounded through the filter capacitor C1.
Compared with the prior art, the invention has obvious advantages and beneficial effects, particularly: the Bluetooth module mainly comprises a pull-up resistor, a temperature detection circuit and a plurality of parallel branches, wherein each parallel branch and the pull-up resistor divide voltage to realize that one input port can receive a plurality of functional inputs after sharing a temperature detection pin of a Bluetooth main control chip, namely port expansion is realized;
secondly, the parallel branch can flexibly select a key, a switch tube or a third connecting end for connecting a low potential output end of the open-drain output circuit according to the actual design requirement, and can realize the functions of key, Hall or charging state and the like;
and by connecting a plurality of parallel branches in parallel, the extension of 256 functions can be realized to the maximum extent, and the development of enterprises and industries is facilitated.
To more clearly illustrate the structural features and effects of the present invention, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a general control schematic block diagram of an embodiment of the present invention;
fig. 2 is a circuit schematic of an embodiment of the invention.
The reference numbers illustrate:
10. voltage dividing node
20. Temperature detection circuit
30. Function expanding circuit
31. A first parallel branch 32 and a second parallel branch
33. Third parallel branch 34 and fourth parallel branch
35. A fifth parallel branch 36 and a sixth parallel branch
41. A push-pull circuit.
Detailed Description
The invention is further described with reference to the following detailed description and accompanying drawings.
As shown in fig. 1 and fig. 2, a parallel input port expansion circuit sharing a temperature detection port of a bluetooth headset includes a pull-up resistor (e.g., resistor R7 in fig. 2), a temperature detection circuit 20 and a function expansion circuit 30, where the temperature detection circuit 20 and the function expansion circuit 30 are connected and form a voltage division node 10 commonly connected to a temperature detection pin of a bluetooth main control chip; the pull-up resistor is provided with a first resistor connecting end and a second resistor connecting end used for connecting a power supply VCC, and the second resistor connecting end is connected with a voltage division node 10;
the function expanding circuit 30 comprises a first parallel branch 31, a second parallel branch 32, a third parallel branch 33, a fourth parallel branch 34, a fifth parallel branch 35 and a sixth parallel branch 36 which are connected in parallel between the ground terminal and the voltage dividing node 10;
the first parallel branch 31 includes a first key S1 and a first resistor R1, the first key S1 and the first resistor R1 are connected in series and then connected in parallel between the ground and the voltage dividing node 10, in this embodiment, the first key S1 is a volume + key, and functions to increase the volume.
The fourth parallel branch 34 includes a second key S2 and a fourth resistor R4, the second key S2 and the fourth resistor R4 are connected in series and then connected in parallel between the ground and the voltage dividing node 10, in this embodiment, the second key S2 is a volume-key, and functions to reduce volume.
The fifth parallel branch 35 includes a third key S3 and a fifth resistor R5, the third key S3 and the fifth resistor R5 are connected in series and then connected in parallel between a ground terminal and the voltage dividing node 10, and the resistances of the first resistor R1, the second resistor R2 and the third resistor R3 are different; in this embodiment, the third button S3 is a play/pause button, which is used to play music or pause music.
The sixth parallel branch 36 includes a fourth key S4 and a sixth resistor R6, and the fourth key S4 and the sixth resistor R6 are connected in series and then connected in parallel between the ground terminal and the voltage dividing node 10; in this embodiment, the fourth key S4 is a favorite key, which is used to favorite the current music.
The second parallel branch 32 comprises a switch tube and a second resistor R2, the switch tube has a first switch tube connection end, a control end for connecting the push-pull circuit 41, and a second switch tube connection end for grounding, and the first switch tube connection end of the switch tube is connected with the voltage dividing node 10 after being connected with the second resistor R2 in series; here, the switching transistor is an NMOS transistor Q1, but the switching transistor may be an NPN transistor (a collector corresponds to a drain, a base corresponds to a gate, and an emitter corresponds to a source), which is not limited herein.
The third parallel branch 33 includes a third resistor R3 and a first connection end for connecting a low potential output end of the open circuit, and the first connection end is connected to the voltage dividing node 10 after being connected in series with the third resistor R3. In this embodiment, the resistances of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are different.
The temperature detection circuit 20 includes a thermistor NTC and a filter capacitor C1, and the resistance of the thermistor NTC and the resistance of the pull-up resistor are the same. The first resistor connecting end is also grounded through a thermistor NTC, and the voltage dividing node 10 is grounded through a filter capacitor C1. In this embodiment, the filter capacitor C1 is used to filter out power supply ripple and noise floor on the temperature detection pin.
In the present embodiment, the existing battery temperature detection circuit 20 is improved, and a parallel branch is added to the temperature detection pin of the bluetooth main control chip. In the embodiment, parallel branches are added, and although the parallel branches include resistors or switching tubes, the parallel branches are lower in cost compared with a bluetooth chip or a port expansion chip with more ports. In the embodiment, the temperature, the key, the hall, the charging state and the like which originally need a plurality of input/output control interfaces can be realized, and now the realization can be realized only by sharing one input/output control interface, and if the calculation is carried out according to 8-bit A/D, the embodiment can expand 256 function inputs at most.
When there is a functional input, the corresponding resistor (e.g. any one of the resistors R1-R6) will divide the voltage with the pull-up resistor R7 of the temperature detection circuit 20, and obtain the corresponding voltage at the temperature detection pin of the bluetooth main control chip, so as to realize the functional input.
Specifically, for such common switches (e.g., the first key S1 to the fourth key S4) that are only turned on or off, the functions of volume +, volume-, play/pause, and collection of current music can be realized by directly pulling the corresponding resistors connected in parallel to the ground through the corresponding switches.
For the output of the corresponding functional chip in the bluetooth headset is open circuit or MOS to ground (e.g. low potential output terminal CHGb of the internal circuit of the charging chip), the output can also be directly connected to the output through a resistor.
For the push-pull circuit 41 (such as a hall output circuit of a bluetooth headset), the circuit needs to add a corresponding switch tube to ground (such as an NMOS tube Q1).
Since the resistance variation of the thermistor NTC is linear and the normal use of the bluetooth headset is in the range of-5 ℃ to 55 ℃, the allowable temperature range of-40 ℃ to 125 ℃ for the thermistor NTC is only a small section, and the added function expansion circuit 30 is still operable.
When no function is input, the voltage acquired by the Bluetooth main control chip through the temperature detection pin is the current temperature value.
When a function is input and the Bluetooth master control chip is pulled to the ground, an instant voltage drop occurs, the Bluetooth master control chip recognizes the drop condition and determines that the function is input, the voltage value read by the temperature detection pin is subtracted by the current temperature value and then is compared with the preset voltage value, and the closest voltage value after comparison is the function to be executed.
The design key points of the invention lie in that it mainly uses the matching of the pull-up resistor, the temperature detection circuit and a plurality of parallel branches, each parallel branch and the pull-up resistor divide the voltage after sharing the temperature detection pin of the Bluetooth main control chip to realize that one input port can receive a plurality of functional inputs, namely realize the port expansion, compared with selecting more ports of Bluetooth chips or adding port expansion chips, the cost is lower, especially, the parallel mode between each parallel branch, any parallel branch has problems, and the normal use of other functions can not be influenced;
secondly, the parallel branch can flexibly select a key, a switch tube or a third connecting end for connecting a low potential output end of the open-drain output circuit according to the actual design requirement, and can realize the functions of key, Hall or charging state and the like;
and by connecting a plurality of parallel branches in parallel, the extension of 256 functions can be realized to the maximum extent, and the development of enterprises and industries is facilitated.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.
Claims (4)
1. The utility model provides a parallelly connected type input port expander circuit of sharing bluetooth headset temperature detect port which characterized in that: the Bluetooth temperature detection circuit comprises a pull-up resistor, a temperature detection circuit and a function expansion circuit, wherein the temperature detection circuit and the function expansion circuit are connected and form a voltage division node which is commonly connected with a temperature detection pin of a Bluetooth main control chip, the pull-up resistor is provided with a first resistor connecting end and a second resistor connecting end used for being connected with a power supply VCC, and the second resistor connecting end is connected with the voltage division node;
the temperature detection circuit comprises a thermistor NTC and a filter capacitor C1, the first resistor connecting end is grounded through the thermistor NTC, and the voltage division node is grounded through a filter capacitor C1;
the function expansion circuit comprises a first parallel branch, a second parallel branch and a third parallel branch which are connected between a grounding end and a voltage division node in parallel;
the first parallel branch comprises a first key and a first resistor, and the first key and the first resistor are connected in series and then connected in parallel between a grounding end and a voltage division node;
the second parallel branch comprises a switch tube and a second resistor, the switch tube is provided with a first switch tube connecting end, a control end used for connecting a push-pull circuit and a second switch tube connecting end used for grounding, and the first switch tube connecting end of the switch tube is connected with a voltage division node after being connected with the second resistor in series;
the third parallel branch comprises a third resistor and a first connecting end used for connecting a low potential output end of the open leakage circuit, the first connecting end is connected with a voltage division node after being connected with the third resistor in series, and the resistance values of the first resistor, the second resistor and the third resistor are different.
2. The parallel type input port expansion circuit sharing a temperature detection port of a bluetooth headset as claimed in claim 1, wherein: the function expanding circuit further comprises a fourth parallel branch connected between the grounding end and the voltage dividing node in parallel, the fourth parallel branch comprises a second key and a fourth resistor, the second key and the fourth resistor are connected between the grounding end and the voltage dividing node in parallel after being connected in series, and the resistance values of the first resistor, the second resistor, the third resistor and the fourth resistor are different.
3. The parallel input port expansion circuit sharing a temperature detection port of a bluetooth headset according to claim 2, wherein: the function expanding circuit further comprises a fifth parallel branch connected between the grounding end and the voltage dividing node in parallel, the fifth parallel branch comprises a third key and a fifth resistor, the third key and the fifth resistor are connected between the grounding end and the voltage dividing node in series and then connected in parallel, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor and the fifth resistor are different.
4. The parallel input port expansion circuit sharing a temperature detection port of a bluetooth headset as claimed in claim 3, wherein: the function expanding circuit further comprises a sixth parallel branch which is connected between the grounding end and the voltage dividing node in parallel, the sixth parallel branch comprises a fourth key and a sixth resistor, the fourth key and the sixth resistor are connected between the grounding end and the voltage dividing node in parallel after being connected in series, and the resistance values of the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor and the sixth resistor are different.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110359753.1A CN113055780B (en) | 2021-04-02 | 2021-04-02 | Parallel input port expansion circuit sharing temperature detection port of Bluetooth headset |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110359753.1A CN113055780B (en) | 2021-04-02 | 2021-04-02 | Parallel input port expansion circuit sharing temperature detection port of Bluetooth headset |
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| CN113055780A true CN113055780A (en) | 2021-06-29 |
| CN113055780B CN113055780B (en) | 2023-03-07 |
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| CN102868392A (en) * | 2011-07-06 | 2013-01-09 | 广东万和新电气股份有限公司 | Portability key circuit |
| CN103678226A (en) * | 2012-09-24 | 2014-03-26 | 炬力集成电路设计有限公司 | General purpose input/output (GPIO) port reuse circuit and method of chip |
| CN105187631A (en) * | 2015-07-31 | 2015-12-23 | 是联（北京）科技有限公司 | Intelligent terminal key device based on earphone interface and control method of intelligent terminal key device |
| CN207573327U (en) * | 2017-09-01 | 2018-07-03 | 惠州市德赛西威汽车电子股份有限公司 | A kind of analog signal detection circuit of vehicle-mounted multichannel button |
| CN110175142A (en) * | 2019-04-18 | 2019-08-27 | 深圳市普威技术有限公司 | A kind of Interface Expanding circuit and device |
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2021
- 2021-04-02 CN CN202110359753.1A patent/CN113055780B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060290209A1 (en) * | 2005-06-15 | 2006-12-28 | Bouchard Guy P | Multiplexed temperature sensing circuit for HID lamp ballast |
| CN102868392A (en) * | 2011-07-06 | 2013-01-09 | 广东万和新电气股份有限公司 | Portability key circuit |
| CN103678226A (en) * | 2012-09-24 | 2014-03-26 | 炬力集成电路设计有限公司 | General purpose input/output (GPIO) port reuse circuit and method of chip |
| CN105187631A (en) * | 2015-07-31 | 2015-12-23 | 是联（北京）科技有限公司 | Intelligent terminal key device based on earphone interface and control method of intelligent terminal key device |
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| CN110175142A (en) * | 2019-04-18 | 2019-08-27 | 深圳市普威技术有限公司 | A kind of Interface Expanding circuit and device |
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