A bluetooth audio transmission module IO circuit and a bluetooth transmission device

Abstract

The utility model discloses a bluetooth audio emission module IO circuit and bluetooth emission device, bluetooth audio emission module IO circuit includes audio input module, voltage conversion module, bluetooth module and wireless unit, and the wireless unit is used for carrying out data transmission with wireless communication equipment to control unit, and the control unit is used for controlling wireless unit and power management unit. The utility model embodiment is in volume regulation, sound effect switching, low power prompt etc. operation time, and bluetooth module can mix the analog audio signal that audio input module received with the prompt tone, and through wireless unit transmission gives bluetooth receiving equipment, not only avoided the prompt tone of the dependence of receiving equipment, while ensured the real time and the intelligibility of prompt tone, through built -in audio decoding module and mix sound module in bluetooth module, can effectively synchronize the prompt tone with audio signal, improved the timeliness of operation feedback, ensured that the user can obtain operation state feedback immediately when adjusting volume or switching sound effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bluetooth module, specifically relates to a bluetooth audio emission module IO circuit and bluetooth emission device. BACKGROUND

[0002] The existing bluetooth audio transmitter is mainly used for wireless transmission of audio signals from an audio source to a connected bluetooth receiving device, such as a headset or a sound box, after encoding. The bluetooth audio transmitter usually does not have an audio decoding function, so it can only transmit audio signals and cannot generate or send any local prompt sound. When a user adjusts the volume or switches the sound effect, the receiving device usually emits a prompt sound to inform the user whether the volume has been maximized or minimized or the sound effect setting has been changed.

[0003] However, the existing bluetooth transmitter cannot directly produce a prompt sound during such operations, which makes it impossible for the user to know the device status or operation result in real time, thereby affecting the user experience. SUMMARY

[0004] The utility model discloses a bluetooth audio emission module IO circuit, including audio input module, voltage conversion module, bluetooth module and TF card decoding module, the bluetooth module connects audio input module and TF card decoding module, the voltage output end of bluetooth module connects the input of voltage conversion module, the output of voltage conversion module connects the voltage input of bluetooth module, audio input module is used for receiving and sending analog audio signal, voltage conversion module is used for providing the power supply required by bluetooth audio emission module IO circuit, bluetooth module is used for receiving, processing and sending the signal of audio input module and TF card decoding module input, TF card decoding module is used for decoding the data in the external TF card and inputing to bluetooth module.

[0005] Further, the bluetooth module includes a control unit, a power management unit, an external communication unit, and a wireless unit. The external communication unit is used for data transmission between the bluetooth module and an external burning device. The first communication end of the control unit is connected to the communication end of the wireless unit. The communication end of the external communication unit is connected to the second communication end of the control unit. The input end of the audio input module is connected to the audio receiving end of the control unit. The power supply end of the power management unit is connected to the power supply end of the external communication unit. The control end of the power management unit is connected to the third communication end of the control unit and the power supply input end of the voltage conversion module. The control unit is used for controlling the wireless unit and the power management unit.

[0006] Further, the TF card decoding module comprises a TF card interface unit and a decoding unit, the TF card interface unit comprises a tenth resistor R100, an eleventh resistor R120 and a ninth capacitor C100, a third pin of the TF card interface unit is connected to a first decoding port SDCMD of the decoding unit, a fifth pin of the TF card interface unit is connected to a second decoding port SDCL7 of the decoding unit, a seventh pin of the TF card interface unit is connected to a third decoding port SDDAT of the decoding unit, a ninth pin of the TF card interface unit is connected to a fourth decoding port SDDET of the decoding unit, a fourth pin of the TF card interface unit is connected to a fifth decoding port SDPG of the decoding unit through the tenth resistor R100 and grounded through the ninth capacitor C100, and a fifth pin of the TF card interface unit is connected to a ninth pin of the TF card interface unit through the eleventh resistor R120.

[0007] Further, the decoding unit comprises a bypass capacitor C7, a bypass capacitor C8, a bypass capacitor C9, a tenth capacitor C200, an eleventh capacitor C300 and a crystal oscillator Y1, a DACVSS pin of the decoding unit is connected to a VCOM pin of the decoding unit through the tenth capacitor C200 and to a power supply end, an IIS_LRCLK of the decoding unit is connected to a PIO15 pin of the control unit, an IIS_BCLK pin of the decoding unit is connected to a PIO16 pin of the control unit, an IIS_DATA pin of the decoding unit is connected to a PIO17 pin of the control unit, an IIS_MCLK pin of the decoding unit is connected to a PIO18 pin of the control unit, a thirtieth pin of the decoding unit is grounded through the eleventh capacitor C300, a VBAT pin, a VDD pin and a BTAVDD pin of the decoding unit are respectively grounded through the bypass capacitor C7, the bypass capacitor C8 and the bypass capacitor C9.

[0008] Further, the audio input module comprises an audio input port, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a second capacitor, a first port of the audio input port is connected to an audio input detection port of the control unit, a second port of the audio input port is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the first capacitor and one end of the third resistor R10, the other end of the third resistor is grounded, the other end of the first capacitor is connected to a right channel input port of the control unit, a third port of the audio input port is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the second capacitor and one end of the fourth resistor, the other end of the fourth resistor is grounded, and the other end of the second capacitor is connected to a left channel input port of the control unit.

[0009] Further, the wireless unit comprises a wireless transceiver port, a third capacitor, a fourth capacitor, a fifth resistor, one end of the third capacitor being grounded, the other end of the third capacitor being connected with the wireless transceiver port and one end of the fifth resistor, the other end of the fifth resistor being connected with one end of the fourth capacitor and a first communication end of the control unit, the other end of the fourth capacitor being grounded.

[0010] Further, the voltage conversion module comprises a fifth capacitor, a sixth capacitor, an electrolytic capacitor, a diode, a low dropout linear regulator, an anode of the diode being connected with the first communication end of the control unit, a cathode of the diode being connected with an enable end of the low dropout linear regulator, a ground end of the low dropout linear regulator being connected with one end of the fifth capacitor, the other end of the fifth capacitor being connected with a second communication end of the control unit and a power input end of the low dropout linear regulator, a voltage output end of the low dropout linear regulator being connected with one end of the sixth capacitor, one end of the electrolytic capacitor and a voltage input end of the Bluetooth module, the other end of the sixth capacitor and the other end of the electrolytic capacitor being grounded.

[0011] Further, the Bluetooth module further comprises a peripheral display unit, the peripheral display unit comprising a first light emitting tube, a second light emitting tube, a key, a sixth resistor, a seventh resistor, one end of the key being connected with a start-stop end of the control unit, the other end of the key being connected with an anode of the first light emitting tube, an anode of the second light emitting tube and a control end of the power management unit, a cathode of the first light emitting tube being connected with one end of the sixth resistor, the other end of the sixth resistor being connected with a first light control port of the control unit, a cathode of the second light emitting tube being connected with one end of the seventh resistor, the other end of the seventh resistor being connected with a second light control port of the control unit.

[0012] Further, the power management unit comprises a power management chip, an eighth resistor, a ninth resistor, a third light emitting tube, a seventh capacitor, an eighth capacitor, a voltage source, a positive pole of the voltage source being connected with a control end of the power management unit, one end of the eighth capacitor and a voltage monitoring port of the power management chip, a charging state display port of the power management chip being connected with one end of the ninth resistor, the other end of the ninth resistor being connected with a cathode of the third light emitting tube, an anode of the third light emitting tube being connected with a second communication end of the control unit, a voltage feedback port of the power management chip being connected with one end of the eighth resistor, a power supply end of the power management chip being connected with the external communication unit and the control unit, the other end of the eighth capacitor, the other end of the voltage source, a ground end of the power management chip and the other end of the eighth resistor being grounded respectively.

[0013] In the second aspect, the utility model further provides a Bluetooth transmitting device, which is characterized by comprising the Bluetooth audio transmitting module IO circuit of the above technical scheme.

[0014] The utility model embodiment in volume regulation, sound effect switching, low power prompt operation, bluetooth module can mix the analog audio signal received by audio input module with prompt tone, and transmit to bluetooth receiving equipment, not only avoid the prompt tone of the receiving equipment, ensure the real time and definition of prompt tone simultaneously, through built in audio decoding module and mix sound module in bluetooth module, can effectively synchronize prompt tone and audio signal, improve the timeliness of operation feedback, ensure that user can obtain operation state feedback immediately when adjusting volume or switching sound effect. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the utility model embodiment or prior art, the following will be briefly introduced to the drawing needed to be used in embodiment or prior art description, obviously, the drawing in the following description only some embodiments of the utility model, for ordinary skilled person in the art, under the premise of not paying the creativity labor intensity, other drawings can also be obtained according to these drawings.

[0016] Figure 1 It is the structural diagram of the utility model embodiment;

[0017] Figure 2 It is the circuit diagram of TF card interface unit;

[0018] Figure 3 It is the circuit diagram of decoding unit;

[0019] Figure 4 It is the circuit diagram of bluetooth module;

[0020] Figure 5 It is the circuit diagram of audio input module;

[0021] Figure 6 It is the circuit diagram of voltage conversion module.

[0022] Reference signs:

[0023] 100, audio input module;

[0024] 200, bluetooth module;

[0025] 210, control unit;220, power management unit;230, external communication unit;240, wireless unit;250, peripheral display unit;

[0026] 300, voltage conversion module;

[0027] 400, TF card decoding module;

[0028] R20, first resistance;

[0029] R21, second resistance;

[0030] R10, third resistor;

[0031] R11, fourth resistor;

[0032] R8, fifth resistor;

[0033] R15, sixth resistor;

[0034] R16, seventh resistor;

[0035] R17, eighth resistor;

[0036] R18, ninth resistor;

[0037] C28, first capacitor;

[0038] C29, second capacitor;

[0039] C5, third capacitor;

[0040] C10, fourth capacitor;

[0041] C16, fifth capacitor;

[0042] C18, sixth capacitor;

[0043] C21, seventh capacitor;

[0044] C22, eighth capacitor;

[0045] CB1, electrolytic capacitor;

[0046] D1, diode;

[0047] AUX_IN, audio input port;

[0048] ANT1, wireless transceiver port;

[0049] U3, low dropout linear regulator;

[0050] U4, power management chip;

[0051] LED1, first light-emitting tube;

[0052] LED2, second light-emitting tube;

[0053] LED3, third light-emitting tube;

[0054] K1, button;

[0055] J1, voltage source;

[0056] USB_DP, first data pin;

[0057] USB_DN, second data pin;

[0058] VCC, power supply line. DETAILED DESCRIPTION

[0059] The utility model will be described further in detail below in combination with the drawings.

[0060] The specific embodiment is merely an explanation of the utility model, and it is not a limitation of the utility model. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as it is within the scope of the claims of the utility model, it is protected by the patent law.

[0061] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0062] Therefore, the detailed description of the embodiments of the utility model provided in the drawings below is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0063] With reference to Figure 1 The utility model provides a kind of bluetooth audio emission module IO circuit, including audio input module 100, voltage conversion module 300, bluetooth module 200 and TF card decoding module 400, the bluetooth module 200 connects the audio input module 100 and the TF card decoding module 400, the voltage output end of the bluetooth module 200 is connected the input end of the voltage conversion module 300, the output end of the voltage conversion module 300 is connected the voltage input end of the bluetooth module 200, the audio input module 100 is used to receive and send analog audio signal, the voltage conversion module 300 is used to provide the power supply required by the bluetooth audio emission module IO circuit, the bluetooth module 200 is used to receive, process and send the signal input by the audio input module 100 and the TF card decoding module 400, the TF card decoding module 400 is used to decode the data in external TF card and input to the bluetooth module 200.

[0064] The utility model embodiment in volume regulation, sound effect switching, low power prompt operation, bluetooth module can mix the analog audio signal received by audio input module with prompt tone, and transmit to bluetooth receiving equipment, not only avoid the prompt tone of the dependence of receiving equipment, ensure the real time and the definition of prompt tone simultaneously, through built -in audio decoding module and mix sound module in bluetooth module, can effectively synchronize prompt tone and audio signal, improve the timeliness of operation feedback, ensure that user can obtain operation state feedback immediately when adjusting volume or switching sound effect.

[0065] Referring to Figures 2-6 The utility model provides another kind of bluetooth audio emission module IO circuit, specifically, the bluetooth module 200 includes control unit 210 and power management unit 220, external communication unit 230 and wireless unit 240230, the external communication unit 230 is used to carry out data transmission between bluetooth module 200 and external burning equipment, the first communication end of the control unit 210 is connected with the communication end of the wireless unit 240230, the communication end of the external communication unit 230 is connected with the second communication end of the control unit 210, the input end of the audio input module 100 is connected with the audio receiving end of the control unit 210, the power supply end of the power management unit 220 is connected with the power supply end of the external communication unit 230, the control end of the power management unit 220 is connected with the third communication end of the control unit 210 and the power input end of the voltage conversion module 300, and the control unit 210 is used to control the wireless unit 240230 and power management unit 220.

[0066] In some embodiments, the TF card decoding module 400 includes a TF card interface unit and a decoding unit, the TF card interface unit includes a tenth resistor R100, an eleventh resistor R120 and a ninth capacitor C100, a third pin of the TF card interface unit is connected to a first decoding port SDCMD of the decoding unit, a fifth pin of the TF card interface unit is connected to a second decoding port SDCL7 of the decoding unit, a seventh pin of the TF card interface unit is connected to a third decoding port SDDAT of the decoding unit, a ninth pin of the TF card interface unit is connected to a fourth decoding port SDDET of the decoding unit, a fourth pin of the TF card interface unit is connected to a fifth decoding port SDPG of the decoding unit through the tenth resistor R100 and grounded through the ninth capacitor C100, and the fifth pin of the TF card interface unit is connected to the ninth pin of the TF card interface unit through the eleventh resistor R120.

[0067] In some embodiments, the decoding unit comprises bypass capacitor C7, bypass capacitor C8, bypass capacitor C9, tenth capacitor C200, eleventh capacitor C300 and crystal oscillator Y1, the DACVSS pin of the decoding unit is connected to the VCOM pin of the decoding unit through the tenth capacitor C200 and to the power supply end, the IIS_LRCLK of the decoding unit is connected to the PIO15 pin of the control unit 210, the IIS_BCLK pin of the decoding unit is connected to the PIO16 pin of the control unit 210, the IIS_DATA pin of the decoding unit is connected to the PIO17 pin of the control unit 210, the IIS_MCLK pin of the decoding unit is connected to the PIO18 pin of the control unit 210, the thirtieth pin of the decoding unit is grounded through the eleventh capacitor C300, and the VBAT pin, the VDD pin and the BTAVDD pin of the decoding unit are grounded through the bypass capacitor C7, the bypass capacitor C8 and the bypass capacitor C9 respectively.

[0068] In the embodiment, the decoding unit can be of the type AC6966B or other types of chips with similar functions.

[0069] In some embodiments, the Bluetooth module 200 sends signals through the PIO19 and PIO20 pins of the control unit 210, which are connected to the PB0 and PB1 pins of the decoding unit in the TF card decoding module. When the prompt sound needs to be switched, the Bluetooth module sends control signals to the PIO19 and PIO20 pins, which transmit signals to the PB0 and PB1 pins of the decoding unit respectively. The decoding unit switches to the corresponding audio file or prompt sound according to the received signals.

[0070] For example, the Bluetooth module sends control signals to the TF card decoding module through the PIO19 and PIO20 pins. If the Bluetooth module needs to play prompt sound 1, it sets the PIO19 to high level and the PIO20 to low level. If the Bluetooth module needs to play prompt sound 2, it sets the PIO19 to low level and the PIO20 to high level. If the Bluetooth module needs to play prompt sound 3, it sets both the PIO19 and the PIO20 to high level. After receiving the control signals from the PIO19 and the PIO20, the PB0 and the PB1 pins of the TF card decoding module, the decoding unit recognizes and decodes the signals and selects the corresponding audio file. In addition to the PIO19 pin and the PIO20 pin, using more pins to achieve the same audio switching function is also within the protection scope of the present application.

[0071] In some embodiments, the audio input module 100 includes an audio input port AUX_IN, a first resistor R20, a second resistor R21, a third resistor R10, a fourth resistor R11, a first capacitor C28, and a second capacitor C29. The first port of the audio input port AUX_IN is connected to the audio input detection port AUXDET of the control unit 210. The second port of the audio input port AUX_IN is connected to one end of the first resistor R20. The other end of the first resistor R20 is connected to one end of the first capacitor C28 and one end of the third resistor R10. The other end of the third resistor R10 is grounded. The other end of the first capacitor C28 is connected to the right channel input port AUXR of the control unit 210. The third port of the audio input port AUX_IN is connected to one end of the second resistor R21. The other end of the second resistor R21 is connected to one end of the second capacitor C29 and one end of the fourth resistor R11. The other end of the fourth resistor R11 is grounded. The other end of the second capacitor C29 is connected to the left channel input port AUXL of the control unit 210. First, the audio input port AUX_IN receives an external audio signal. The first port of the port is connected to the audio input detection port AUXDET of the control unit 210 for detecting the presence of the audio signal. Through the cooperation of resistors and capacitors, the signal is distributed to the right and left channel processing paths. Then, the second port of the audio signal is connected to the first capacitor C28 and the third resistor R10 through the first resistor R20, forming a high-pass filter network that filters out low-frequency noise or unwanted signals. The right channel signal is transmitted to the right channel input port AUXR of the control unit 210 through the first capacitor C28. At the same time, the third resistor R10 grounds the excess signal. The audio signal of the second port is also transmitted to the second capacitor C29 through the second resistor R21. After a similar filtering process, the signal is sent to the left channel input port AUXL of the control unit 210. The capacitors C28 and C29 smooth the signal to avoid interference and ensure that the audio signal transmitted to the control unit 210 remains clear.

[0072] This embodiment effectively suppresses noise and interference through the combined use of capacitors and resistors, improving the quality of the audio signal. The control unit 210 is responsible for coordinating the reception and processing of left and right channel signals, ensuring accurate transmission of the audio signal and optimizing the overall performance of the Bluetooth audio transmission module IO circuit.

[0073] In some embodiments, the wireless unit 240230 includes a wireless transceiver port ANTI, a third capacitor C5, a fourth capacitor CIO, a fifth resistor R8, one end of the third capacitor C5 is grounded, the other end of the third capacitor C5 is connected to the wireless transceiver port ANTI and one end of the fifth resistor R8, the other end of the fifth resistor R8 is connected to one end of the fourth capacitor CIO and the first communication end of the control unit 210, the other end of the fourth capacitor CIO is grounded.

[0074] Specifically, the wireless unit 240230 communicates with external wireless devices through the wireless transceiver port ANTI, one end of the third capacitor C5 is grounded, and the other end is connected to the wireless transceiver port ANTI through the fifth resistor R8, which is used to balance and filter high-frequency signals, reduce noise interference, the fifth resistor R8 is connected to the fourth capacitor CIO, the capacitor CIO further filters and stabilizes the power supply signal, and ensures good signal transmission, the first communication end of the control unit 210 ANT is connected to the fourth capacitor CIO, which ensures stable data transmission and signal reception.

[0075] In this embodiment, the capacitor and resistor work together to ensure efficient communication and low interference transmission of the wireless unit 240230, improve the overall performance and reliability of the system, and ensure stable operation of wireless communication in complex environments.

[0076] In some embodiments, the voltage conversion module 300 includes a fifth capacitor C16, a sixth capacitor C18, an electrolytic capacitor CB1, a diode D1, a low dropout linear regulator U3, the anode of the diode D1 is connected to the first communication end of the control unit 210, the cathode of the diode D1 is connected to the enable end EN of the low dropout linear regulator U3, the ground end GND of the low dropout linear regulator U3 is connected to one end of the fifth capacitor C16, the other end of the fifth capacitor C16 is connected to the second communication end VBAT of the control unit 210 and the power input end VI of the low dropout linear regulator U3, the voltage output end VO of the low dropout linear regulator U3 is connected to one end of the sixth capacitor C18, one end of the electrolytic capacitor CB1 and the voltage input end PADS2 of the Bluetooth module 200, the other end of the sixth capacitor C18 and the other end of the electrolytic capacitor CB1 are grounded.

[0077] Specifically, the main function of the voltage conversion module 300 is to provide stable power supply for the entire circuit and ensure that each module obtains appropriate voltage under different working conditions. Diode D1 is connected between the first communication end ANT of the control unit 210 and the low-dropout linear regulator U3, which plays a role in preventing the influence of reverse current. The anode of D1 is connected to the ANT port of the wireless unit 240, and the cathode is connected to the enable end EN of the low-dropout linear regulator U3, which controls the activation of the regulator. The low-dropout linear regulator U3 is responsible for converting the input voltage into the required stable output voltage. Its ground end GND is connected to the fifth capacitor C16, which ensures a stable ground potential. The fifth capacitor C16 is also connected to the power input end VBAT of the control unit 210 and the input end VI of the regulator, further smoothing the input voltage. The output end VO of the low-dropout linear regulator U3 is connected to the sixth capacitor C18 and the electrolytic capacitor CB1, which respectively play the roles of smoothing the output voltage and filtering. The sixth capacitor C18 is grounded through the other end of CB1, thereby ensuring the stability of the voltage output of the regulator U3, which supplies the voltage input end PADS2 of the Bluetooth module 200, ensuring the stability and reliability of the power supply of the entire system.

[0078] In this embodiment, the voltage stability of the entire circuit is ensured through the filtering effect of the low-dropout linear regulator U3 and multiple capacitors, reducing the impact of voltage fluctuations on device operation. The reverse current protection function of diode D1 avoids damage to the system due to reverse current.

[0079] In addition, through fine voltage conversion and filtering design, the reliability of power supply is effectively improved, ensuring the normal operation of the control unit 210 and other electronic components, and improving the performance and stability of the overall circuit.

[0080] In some embodiments, the Bluetooth module 200 further includes a peripheral display unit 250, which includes a first light-emitting tube LED1, a second light-emitting tube LED2, a key K1, a sixth resistor R15, and a seventh resistor R16. One end of the key K1 is connected to the start-stop end SYS_CTRL of the control unit 210, and the other end is connected to the anode of the first light-emitting tube LED1, the anode of the second light-emitting tube LED2, and the control end of the power management unit 220. The cathode of the first light-emitting tube LED1 is connected to one end of the sixth resistor R15, and the other end of the sixth resistor R15 is connected to the first light control port LED0 of the control unit 210. The cathode of the second light-emitting tube LED2 is connected to one end of the seventh resistor R16, and the other end of the seventh resistor R16 is connected to the second light control port LED1 of the control unit 210.

[0081] Specifically, one end of the key K1 is connected to the start-stop end SYS_CTRL of the control unit 210, and the other end is connected to the anode of the first light-emitting tube LED1 and the second light-emitting tube LED2 and the control end of the power management unit 220. The key K1 is used to start or trigger the relevant operation of the control unit 210. When the key K1 is pressed, the signal is transmitted through the anode part connected to LED1 and LED2, and the LED light is lit to indicate the start-stop or state change. The cathode of the first light-emitting tube LED1 is connected to the sixth resistor R15, and the other end of the sixth resistor R15 is connected to the first light control port LED0 of the control unit 210 to control the on-off state of the light. The cathode of the second light-emitting tube LED2 is connected to the seventh resistor R16, and the other end of the seventh resistor R16 is connected to the second light control port LED1 of the control unit 210 to further realize another light indication function. By controlling the output signal of the control port of the control unit 210, the light state can be adjusted to realize visual feedback of the system state.

[0082] In this embodiment, the state change of LED1 and LED2 provides intuitive system state feedback for the user, enhancing the visual experience of user operation: the design of the key K1 facilitates the user to trigger start-stop or other control through simple operation, improving the interactivity of the device, and the use of resistors R15 and R16 ensures proper control of the current, protecting LED1 and LED2 from overcurrent damage, while making the circuit run more stably.

[0083] In some embodiments, the power management unit 220 includes a power management chip U4, an eighth resistor R17, a ninth resistor R18, a third light-emitting tube LED3, a seventh capacitor C21, an eighth capacitor C22, and a voltage source J1. The positive electrode of the voltage source J1 is connected to the control end of the power management unit 220, one end of the eighth capacitor C22, and the voltage monitoring port VBAT of the power management chip U4. The charge status display port of the power management chip U4 is connected to one end of the ninth resistor R18, and the other end of the ninth resistor R18 is connected to the cathode of the third light-emitting tube LED3. The anode of the third light-emitting tube LED3 is connected to the second communication end VBAT of the control unit 210. The voltage feedback port RG of the power management chip U4 is connected to one end of the eighth resistor R17. The power supply end 5V of the power management chip U4 is connected to the external communication unit 230 and the control unit 210. The other end of the eighth capacitor C22, the other end of the voltage source J1, the ground end GND of the power management chip U4, and the other end of the eighth resistor R17 are grounded.

[0084] Specifically, the power management unit 220 manages the stability and charging state of the system power supply through the power management chip U4 and related components such as resistors R17, R18, and capacitors C21, C22. The voltage source J1 provides power, with the positive terminal connected to the control end of the power management unit 220, the third capacitor C22, and the voltage monitoring port VBAT of the power management chip U4. The power management chip U4 monitors the state of the battery in real time based on the voltage of the voltage monitoring port VBAT. The charging state display port of the power management chip U4 is connected to the cathode of the third light-emitting tube LED3 through the ninth resistor R18. When LED3 is on, it indicates the charging state or battery power information. The anode of LED3 is connected to the second communication end VBAT of the control unit 210, which is used to display the charging or power state. The voltage feedback port RG of the power management chip U4 is connected through the eighth resistor R17 to feedback the battery voltage information to adjust the charging process and ensure system stability.

[0085] In addition, the power supply end 5V of the power management chip U4 provides stable power supply for the control unit 210 and the external communication unit 230. The connection of the eighth capacitor C22, voltage source J1, ground terminal, and other components ensures the normal operation of the power management unit 220, and the current is effectively adjusted through resistor R17.

[0086] In this embodiment, through precise voltage monitoring and feedback adjustment, the stability and efficient operation of the system power supply are ensured: the combination of the power management chip U4 with capacitors C21, C22, and resistors R17, R18 enhances the safety and stability during battery charging. The charging state is displayed intuitively through LED3, improving user experience. Precise control of the power module ensures reliable power supply for the control unit 210 and the external communication unit 230, optimizing device power management and system performance.

[0087] In some embodiments, the external communication unit 230 is a USB interface.

[0088] In some embodiments, the positive signal line DP of the USB interface is connected to the first data pin USB_DP of the control unit 210, the negative signal line DN of the USB interface is connected to the second data pin USB_DN of the control unit 210, and the power supply line VCC of the USB interface is connected to the power supply end 5V of the power management chip U4 and the second communication end VBAT of the control unit 210.

[0089] Specifically, the external communication unit 230 uses a USB interface to transmit data and supply power to the control unit 210, the positive signal line DP of the USB interface is connected to the first data pin USB_DP of the control unit 210, the negative signal line DN is connected to the second data pin USB_DN, bidirectional data transmission is realized, the power supply line VCC of the USB interface is connected to the power supply end 5V of the power management chip U4 and the second communication end VBAT of the control unit 210, and stable power support is provided for the control unit 210 and the power management unit 220, so as to ensure the normal operation of the system.

[0090] The embodiment realizes efficient and reliable data transmission between the external device and the control unit 210 through the USB interface, the USB interface not only supports data exchange but also provides stable power supply for the system, optimizes power management, and ensures efficient compatibility and stability of the control unit 210 and the external device through reasonable connection of signal lines and power supply lines, thereby improving the overall performance and user experience of the device.

[0091] Specifically, the working principle of the utility model is as follows, the TF card stores pre-recorded voice data, when the user adjusts the volume, switches the sound effect or prompts the low power, etc., the TF card decoding module 400 is responsible for reading and decoding the voice data in the TF card J1, the decoded voice data is sent to the control unit 210 in the Bluetooth module 200 through the TF card decoding module 400, at the same time, the audio input module 100 receives the analog audio signal from the external audio source through the AUX_IN port, the control unit 210 mixes the audio signal from the audio input module 100 and the decoded voice data from the TF card decoding module 400, and the mixing process is realized through the internal mixing module, so as to ensure the effective synchronization of the prompt tone and the user audio signal.

[0092] Further, the mixed audio signal is wirelessly transmitted through the wireless unit 230 of the Bluetooth module 200, the wireless unit 230 establishes a connection with the external Bluetooth receiving device through the wireless transceiving port ANTI, and efficiently and stably sends the mixed audio signal to the target device, in the audio signal transmission process, the voltage conversion module 300 ensures the power stability of the entire circuit through the low-dropout linear regulator U3 and a plurality of capacitors C16, C18 and the electrolytic capacitor CB1, prevents the voltage fluctuation from affecting the quality of the audio signal, at the same time, the diode D1 provides reverse current protection to avoid system damage due to reverse current, the control unit 210 coordinates the power supply and communication of each module through the power management unit 220, ensures the efficient operation of the system under different working conditions, the power management unit 220 monitors the battery power in real time through the power management chip U4, and provides intuitive feedback of the charging state through the LED 3.

[0093] Further, the user operates through the key K1 on the peripheral display unit 250, when the key K1 is pressed, the LED1 and LED2 will be lit or extinguished according to the operation state, provides instant visual feedback, enhances the user's operation experience.

[0094] The utility model is not limited to the above optional implementation, anyone under the enlightenment of the utility model can draw other various forms of products, but no matter make any change in its shape or structure, any technical scheme falling into the scope defined by the utility model claims falls within the protection scope of the utility model.

Claims

1. A Bluetooth audio transmit module IO circuit, comprising: a Bluetooth audio transmit module; a Bluetooth audio transmit module IO interface; and a Bluetooth audio transmit module IO interface driver. The application relates to a Bluetooth audio transmission module, which comprises an audio input module (100), a voltage conversion module (300), a Bluetooth module (200) and a TF card decoding module (400), wherein the Bluetooth module (200) is connected with the audio input module (100) and the TF card decoding module (400), the voltage output end of the Bluetooth module (200) is connected with the input end of the voltage conversion module (300), the output end of the voltage conversion module (300) is connected with the voltage input end of the Bluetooth module (200), the audio input module (100) is used for receiving and sending analog audio signals, the voltage conversion module (300) is used for providing power supply required by the Bluetooth audio transmission module IO circuit, the Bluetooth module (200) is used for receiving, processing and sending signals input by the audio input module (100) and the TF card decoding module (400), and the TF card decoding module (400) is used for decoding data in an external TF card and inputting the data into the Bluetooth module (200).

2. The Bluetooth audio transmitting module IO circuit according to claim 1, wherein, The Bluetooth module (200) comprises a control unit (210), a power management unit (220), an external communication unit (230) and a wireless unit (240), the external communication unit (230) is used for data transmission between the Bluetooth module (200) and an external burning device, the first communication end of the control unit (210) is connected with the communication end of the wireless unit (240), the communication end of the external communication unit (230) is connected with the second communication end of the control unit (210), the input end of the audio input module (100) is connected with the audio receiving end of the control unit (210), the power supply end of the power management unit (220) is connected with the power supply end of the external communication unit (230), the control end of the power management unit (220) is connected with the third communication end of the control unit (210) and the power supply input end of the voltage conversion module (300), and the control unit (210) is used for controlling the wireless unit (240) and the power management unit (220).

3. The Bluetooth audio transmitting module IO circuit according to claim 2, wherein, The TF card decoding module (400) comprises a TF card interface unit and a decoding unit, the TF card interface unit comprises a tenth resistor R100, an eleventh resistor R120 and a ninth capacitor C100, the third pin of the TF card interface unit is connected with the first decoding port SDCMD of the decoding unit, the fifth pin of the TF card interface unit is connected with the second decoding port SDCL7 of the decoding unit, the seventh pin of the TF card interface unit is connected with the third decoding port SDDAT of the decoding unit, the ninth pin of the TF card interface unit is connected with the fourth decoding port SDDET of the decoding unit, the fourth pin of the TF card interface unit is connected with the fifth decoding port SDPG of the decoding unit through the tenth resistor R100 and grounded through the ninth capacitor C100, and the fifth pin of the TF card interface unit is connected with the ninth pin of the TF card interface unit through the eleventh resistor R120.

4. The Bluetooth audio transmitting module IO circuit according to claim 3, wherein, The decoding unit includes bypass capacitor C7, bypass capacitor C8, bypass capacitor C9, tenth capacitor C200, eleventh capacitor C300 and crystal oscillator Y1, the DACVSS pin of the decoding unit is connected to the VCOM pin of the decoding unit through the tenth capacitor C200 and is connected to the power supply end, the IIS_LRCLK of the decoding unit is connected to the PIO15 pin of the control unit (210), the IIS_BCLK pin of the decoding unit is connected to the PIO16 pin of the control unit (210), the IIS_DATA pin of the decoding unit is connected to the PIO17 pin of the control unit (210), the IIS_MCLK pin of the decoding unit is connected to the PIO18 pin of the control unit (210), the thirtieth pin of the decoding unit is grounded through the eleventh capacitor C300, the VBAT pin, the VDD pin and the BTAVDD pin of the decoding unit are grounded through the bypass capacitor C7, the bypass capacitor C8 and the bypass capacitor C9 respectively.

5. The Bluetooth audio transmit module IO circuit of claim 2, wherein, The audio input module (100) includes an audio input port, a first resistor, a second resistor, a third resistor, a fourth resistor, a first capacitor and a second capacitor, the first port of the audio input port is connected to the audio input detection port of the control unit (210), the second port of the audio input port is connected to one end of the first resistor, the other end of the first resistor is connected to one end of the first capacitor and one end of the third resistor R10, the other end of the third resistor is grounded, the other end of the first capacitor is connected to the right channel input port of the control unit (210), the third port of the audio input port is connected to one end of the second resistor, the other end of the second resistor is connected to one end of the second capacitor and one end of the fourth resistor, the other end of the fourth resistor is grounded, and the other end of the second capacitor is connected to the left channel input port of the control unit (210).

6. The Bluetooth audio transmitting module IO circuit according to claim 2, wherein, The wireless unit (240) includes a wireless transceiver port, a third capacitor, a fourth capacitor and a fifth resistor, one end of the third capacitor is grounded, the other end of the third capacitor is connected to the wireless transceiver port and one end of the fifth resistor, the other end of the fifth resistor is connected to one end of the fourth capacitor and the first communication end of the control unit (210), and the other end of the fourth capacitor is grounded.

7. The Bluetooth audio transmit module IO circuit of claim 6, wherein, The voltage conversion module (300) includes a fifth capacitor, a sixth capacitor, an electrolytic capacitor, a diode and a low dropout linear regulator, the anode of the diode is connected to the first communication end of the control unit (210), the cathode of the diode is connected to the enable end of the low dropout linear regulator, the ground end of the low dropout linear regulator is connected to one end of the fifth capacitor, the other end of the fifth capacitor is connected to the second communication end of the control unit (210) and the power input end of the low dropout linear regulator, the voltage output end of the low dropout linear regulator is connected to one end of the sixth capacitor, one end of the electrolytic capacitor and the voltage input end of the Bluetooth module (200), and the other end of the sixth capacitor and the other end of the electrolytic capacitor are grounded.

8. The Bluetooth audio transmit module IO circuit of claim 7, wherein, The Bluetooth module (200) further comprises a peripheral display unit (250), the peripheral display unit (250) comprises a first light emitting tube, a second light emitting tube, a button, a sixth resistor and a seventh resistor, one end of the button is connected to the start-stop end of the control unit (210), the other end of the button is connected to the anode of the first light emitting tube, the anode of the second light emitting tube and the control end of the power management unit (220), the cathode of the first light emitting tube is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the first light control port of the control unit (210), the cathode of the second light emitting tube is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to the second light control port of the control unit (210).

9. The Bluetooth audio transmit module IO circuit of claim 8, wherein, The power management unit (220) comprises a power management chip, an eighth resistor, a ninth resistor, a third light emitting tube, a seventh capacitor, an eighth capacitor and a voltage source, the positive electrode of the voltage source is connected to the control end of the power management unit (220), one end of the eighth capacitor and the voltage monitoring port of the power management chip, one end of the charge status display port of the power management chip is connected to the ninth resistor, the other end of the ninth resistor is connected to the cathode of the third light emitting tube, the anode of the third light emitting tube is connected to the second communication end of the control unit (210), one end of the voltage feedback port of the power management chip is connected to the eighth resistor, the power supply end of the power management chip is connected to the external communication unit (230) and the control unit (210), the other end of the eighth capacitor, the other end of the voltage source, the ground end of the power management chip and the other end of the eighth resistor are grounded respectively.

10. A Bluetooth transmitting device, characterized in that, A Bluetooth audio transmission module IO circuit comprising a Bluetooth audio transmission module IO circuit as claimed in any one of claims 1 to 9.

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