WO2023040654A1

WO2023040654A1 - Control chip and bluetooth headset charging device

Info

Publication number: WO2023040654A1
Application number: PCT/CN2022/115888
Authority: WO
Inventors: 甘静
Original assignee: 深圳英集芯科技股份有限公司
Priority date: 2021-09-16
Filing date: 2022-08-30
Publication date: 2023-03-23
Also published as: CN115833288A; CN113541277A; CN113541277B

Abstract

The present application provides a control chip and a Bluetooth headset charging device. The control chip comprises: a control module, a button detection circuit and a first drive circuit that are connected to a first pin, and a Hall detection circuit and a second drive circuit that are connected to a second pin; the control module is used for respectively enabling the button detection circuit and the first drive circuit corresponding to a first light-emitting diode module within non-overlapping time periods of each first cycle, and respectively enabling the Hall detection circuit and the second drive circuit corresponding to a second light-emitting diode module within non-overlapping time periods of each second cycle. The present application can achieve button detection, hall switch detection, and lighting of charging and discharging prompt lamps by means of two pins, thereby facilitating saving of the costs of the control chip.

Description

Control chip and Bluetooth headset charging device

This application claims the priority of the Chinese patent application with the application number 2021110854338 and the application name "control chip and Bluetooth earphone charging device" submitted to the China Patent Office on September 16, 2021, the entire content of which is incorporated by reference in this application .

technical field

The present application relates to the field of electronic technology, in particular to a control chip and a Bluetooth earphone charging device.

Background technique

The Bluetooth headset charging compartment is a device used to charge the wireless Bluetooth headset. At present, the common Bluetooth headset charging compartment is composed of buttons, Hall switch, charging power indicator, discharging power indicator, Bluetooth headset charging compartment control chip, battery and other components. Usually, when designing the control chip of the Bluetooth headset charging compartment, the button detection, Hall switch detection, charging indicator light and discharge indicator light will each occupy a pin, the cost of chip packaging cannot be effectively optimized, and the system cost will increase accordingly.

Contents of the invention

The application provides a control chip and a Bluetooth earphone charging device, in order to solve the problem of high cost of traditional control chips.

In the first aspect, an embodiment of the present application provides a control chip, which is applied to a charging device for a Bluetooth headset, including: a control module, a button detection circuit, a Hall detection circuit, a first drive circuit, a second drive circuit, and a first pin and the second pin;

The control module is respectively connected to the control port of the key detection circuit, the control port of the first drive circuit, the control port of the second drive circuit and the control port of the Hall detection circuit, and the key detection circuit The first end of the first drive circuit is connected to the first pin, the first pin is used to connect the first light-emitting diode module and the button, and the first end of the Hall detection circuit , the first end of the second driving circuit is connected to the second pin, and the second pin is used to connect the second light emitting diode module and the Hall switch;

The control module is used to enable the key detection circuit in the first time period of each first cycle, and detect the state of the key through the key detection circuit;

The control module is further configured to enable the first driving circuit in the second time period of each first cycle, and when the first driving circuit is in an enabled state and the charging device is the first In a state, control the first driving circuit to light up the first light-emitting diode module;

The control module is further configured to enable the Hall detection circuit in the third time period of each second cycle, and detect the state of the Hall switch through the Hall detection circuit;

The control module is further configured to enable the second drive circuit in the fourth time period of each second cycle, and when the second drive circuit is in an enabled state and the charging device is the first In the second state, control the second drive circuit to light up the second light emitting diode module;

Wherein, the first time period does not overlap with the second time period, and the third time period does not overlap with the fourth time period; the first state is any one of a charging state and a discharging state , the second state is another one of the charging state and the discharging state except the first state.

In a second aspect, the present application provides a charging device for a Bluetooth headset, including the control chip as described in the first aspect.

It can be seen that in the embodiment of the present application, the button detection circuit and the first drive circuit share one pin, the Hall detection circuit and the second drive circuit share one pin, and the control module enables The button detection circuit and the first drive circuit, so that the button detection and the lighting control of the first light-emitting diode module can be realized through one pin, and the Hall detection circuit and the second drive circuit are respectively enabled in different time periods of the second cycle , so that the Hall detection and the lighting control of the second light-emitting diode module can be realized through one pin. That is to say, the control chip can realize button detection, Hall switch detection, and lighting of the charge and discharge indicator light through two pins, which is beneficial to save the cost of the control chip.

Description of drawings

Fig. 1 is a schematic circuit diagram of a control chip provided by the present application;

Fig. 2 is a circuit schematic diagram of a button detection circuit and a first drive circuit provided by the present application;

FIG. 3 is a circuit schematic diagram of a Hall detection circuit and a second drive circuit provided by the present application;

FIG. 4 is a schematic circuit diagram of another key detection circuit and a first drive circuit provided by the present application;

FIG. 5 is a circuit schematic diagram of another Hall detection circuit and a second drive circuit provided by the present application;

Fig. 6 is the circuit principle diagram of another kind of button detection circuit provided by the present application;

FIG. 7 is a circuit schematic diagram of another first driving circuit provided by the present application;

FIG. 8 is a schematic circuit diagram of another second drive circuit provided by the present application;

Fig. 9 is a schematic circuit diagram of another control chip provided by the present application;

Fig. 10 is a distribution example diagram of a first time period and a second time period in a first cycle provided by the present application;

Fig. 11 is a distribution example diagram of a third time period and a fourth time period in a second cycle provided by the present application.

The application will be further described below in conjunction with the accompanying drawings and embodiments.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

It should be noted that the terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. As used in the embodiments of the present invention and the appended claims, the singular forms "a", "said" and "the" are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

Before introducing the specific embodiments, some nouns in the embodiments of the present application are explained, as follows:

Hall switch detection, the Hall switch will convert the information of opening and closing the cover of the Bluetooth headset charging device (such as the Bluetooth headset charging compartment) into high and low level information, and output it to the control chip in the Bluetooth headset charging device, the control chip Detecting that the level information of the Hall switch is effective level information will cause the Bluetooth headset charging device to switch to the discharge state.

Example 1:

Referring to FIG. 1 , the present embodiment provides a control chip, which is applied to a charging device for a Bluetooth headset, including: a control module, a button detection circuit, a Hall detection circuit, a first drive circuit, a second drive circuit, a first pin and the second pin;

Wherein, the first period and the second period may or may not overlap, which is not specifically limited here.

Among them, in different time periods of each cycle, when the control module enables a certain circuit in a certain time period, it also invalidates the circuit that needs to be enabled in another time period of the cycle. Only one of the two circuits of a pin will be enabled, and the unenabled circuit will be in an invalid state by default and cannot work. For example, when the key detection circuit is enabled in the first time period, the first drive circuit is in an invalid state (that is, the first drive circuit is turned off); otherwise, the first drive circuit is enabled in the second time period, and the key The detection circuit is in an invalid state. The enabling and disabling of the Hall detection circuit and the second driving circuit in the second period are the same.

In a specific implementation, the control chip can also include a third pin, which is used to connect a charging adapter, and the control module is connected to the third pin, and detects whether there is a charging adapter connected to the third pin, thereby Determine whether the charging device is in a charging state; the control module can also determine whether the charging device is in a discharging state according to the detected state of the button, or the control module can determine whether the charging device is in a discharging state according to the detected state of the Hall switch state, specifically, when the control module detects that there is no adapter connected to the third pin and the button is in the first preset state (for example, the button is pressed), it determines that the charging device is in the discharging state, or the control module detects that the third pin If no adapter is connected to the pin, and the Hall switch is in a preset state (for example, the output voltage of the Hall switch is within a preset threshold range), it is determined that the charging device is in a discharging state.

Based on the status of the charging device, the control module can periodically control the first driving circuit or the second driving circuit within a specific period of time to light up the first LED module or the second LED module. Since the first LED module and the second LED module are periodically turned on in corresponding states, the user will see that the LED modules are continuously lit under the effect of persistence of vision. For example, taking the first state as the charging state and the second state as the discharging state as an example, when the charging device is in the charging state, the first driving circuit lights up the first LED module in the second time period of each first cycle, That is, when the charging device is in the charging state, the user will see that the first light-emitting diode module is continuously lit, and the first light-emitting diode module acts as a charging indicator light, and when the charging device is in the discharging state, the second driving circuit Light the second LED module in the fourth period of each second cycle, that is, when the charging device is in the discharge state, the user will see that the second LED module is continuously lit, and the second LED module plays a role in charging. The role of the discharge indicator.

In a specific implementation, the control module can always save the last determined state result of the charging device, and the control module can determine whether it is necessary to control the first driving circuit through the saved state of the charging device in the second time period and the fourth time period Or the second driving circuit turns on the corresponding LED module.

It can be seen that in the embodiment of the present application, the button detection circuit and the first drive circuit share one pin, the Hall detection circuit and the second drive circuit share one pin, and the control module enables The button detection circuit and the first drive circuit, so that the button detection and the lighting control of the first light-emitting diode module can be realized through one pin, and the Hall detection circuit and the second drive circuit are respectively enabled in different time periods of the second cycle , so as to realize Hall detection and light-on control of the second light-emitting diode module through one pin. That is to say, the control chip can realize button detection, Hall switch detection, and lighting of the charge and discharge indicator light through two pins, which is beneficial to save the cost of the control chip.

In a possible example, referring to FIG. 2 , the key detection circuit includes: a key detection module, a first comparator module, and a first switch module; the first drive circuit includes a second switch module; the control module is connected to The control port of the key detection module, the control port of the first switch module, and the control port of the second switch module; the input voltage of the first terminal of the first switch module is a first input voltage, the The input voltage of the first terminal of the second switch module is the second input voltage, the second terminal of the first switch module, the second terminal of the second switch module and the first input of the first comparator module After the terminal is combined, it is connected to the first pin, the input voltage of the second input terminal of the first comparator module is the third input voltage, and the output terminal of the first comparator module is connected to the first pin of the button detection module. one end;

The key detection module is used to determine the state of the key according to the output of the first comparator module, and the control module is used to enable the key detection module within the first time period and control the The first switch module is turned on, and the state of the button is detected through the button module; the control module is also used to enable the second switch module within the second time period, and switch on the When the module is in the enabled state and the charging device is in the first state, the second switch module is controlled to be turned on.

In a specific implementation, the switch module may be a MOS transistor (field effect transistor), etc., and the comparator module may be a voltage comparator.

Wherein, when the control module enables the button detection module and controls the first switch module to be turned on in the first time period, it can also control the second switch module to be turned off at the same time, so as to avoid the influence of the second input voltage on the button detection; correspondingly Yes, when the control module controls the second switch module to be turned on within the second time period, it can also control the first switch module to be turned off at the same time, so as to prevent the first input voltage error from affecting the working state of the first LED module.

Wherein, in the first time period, when the first switch module is turned on, the voltage of the first input terminal of the first comparator module will be pulled to the voltage value of the first input voltage. At this time, if the key is pressed, the second The voltage of the first input terminal of a comparator module will be pulled below the first input voltage, and by setting the value of the third input voltage, it can be judged whether the button is pressed according to the output result of the first comparator module, for example, the third The value of the input voltage is set to be equal to the value of the first input voltage, then after the key is pressed, the output voltage of the first comparator module will change, and the key detection module can determine the value of the key according to the output voltage of the first comparator module state.

In the second time period, when the second switch module is turned on, in order to ensure that the first LED module is lit, the value of the second input voltage should be set to be greater than the conduction voltage of the first LED module.

It can be seen that in this example, the key detection circuit and the first driving circuit time-divisionally multiplex the first pin, and the key detection function and the lighting control of an indicator light can be realized through one pin, which is beneficial to save the cost of the control chip.

In a possible example, referring to FIG. 3 , the Hall detection circuit includes: a Hall detection module, a second comparator module, the second drive circuit includes a third switch module; the control module is connected to the Hall The control port of the Er detection module and the control port of the third switch module; the input voltage of the first terminal of the third switch module is the fourth input voltage, the second terminal of the third switch module and the first terminal of the third switch module The first input terminals of the two comparator modules are combined and then connected to the second pin, the input voltage of the second input terminal of the second comparator module is the fifth input voltage, and the output terminal of the second comparator module Connect the first end of the Hall detection module;

The Hall detection module is used to determine the state of the Hall switch according to the output of the second comparator module, and the control module is used to enable the Hall detection module within the third time period, The state of the Hall switch is detected by the Hall detection module; the control module is also configured to enable the third switch module within the fourth time period, and enable the third switch module to enable When the charging device is in the capable state and the charging device is in the second state, the third switch module is controlled to be turned on.

Wherein, when the control module enables the Hall detection module within the third time period, it can also control the third switch module to be turned off at the same time, so as to avoid the influence of the fourth input voltage on the Hall switch detection.

In specific implementation, for a Bluetooth headset charging device such as a Bluetooth headset charging compartment, the Hall switch will output a specific voltage value according to the state of opening and closing the cover of the charging compartment, for example, when the cover is opened, the Hall switch outputs The voltage is the first preset voltage, and when the cover is closed, the output voltage of the Hall switch is the second preset voltage. Based on the chip setting shown in Figure 3, by setting the fifth input voltage value, the Hall detection module can determine the output voltage of the Hall switch according to the output voltage of the second comparator module within the third time period (i.e. Determine the state of the Hall switch), specifically, the fifth input voltage value can be set to a value between the first preset voltage and the second preset voltage, that is, the fifth input voltage value is greater than the first preset voltage and the second preset voltage The smaller voltage value of the two preset voltages is smaller than the larger voltage value of the first preset voltage and the second preset voltage.

It can be seen that in this example, the Hall detection circuit and the second drive circuit time-divisionally multiplex the second pin, and the Hall switch detection function and the lighting control of an indicator light can be realized through one pin, which is conducive to saving control chips the cost of.

In a possible example, referring to FIG. 4 , the anode of the first light emitting diode module is combined with the first end of the button and then connected to the first pin, and the cathode of the first light emitting diode module is connected to the first end of the button. The second end of the button is grounded; the voltage value of the first input voltage is less than the conduction voltage value of the first light emitting diode module, and the voltage value of the second input voltage is greater than the conduction voltage value of the first light emitting diode module pass voltage value.

Wherein, the voltage value of the first input voltage is less than the conduction voltage of the first light-emitting diode module, that is, in the first time period of each cycle, the control module enables the first switch module, and the voltage of the first pin is pulled to When the voltage value of the first input voltage is low, it will not affect the first LED module, causing the first LED module to be wrongly lit.

The voltage value of the second input voltage is greater than the turn-on voltage value of the first light-emitting diode module, which can ensure that in the second time period of each first cycle, if the charging device is in the first state, the first driving circuit can be activated. Light up the first LED module.

It can be seen that in this example, the voltage value of the first input voltage is smaller than the conduction voltage value of the first LED module, and the voltage value of the second input voltage is greater than the conduction voltage value of the first LED module, which is beneficial to avoid In the first period of time of the cycle, the first input voltage causes false lighting of the first light-emitting diode module, which improves the reliability of the system operation.

In a possible example, referring to FIG. 5 , the control chip further includes a first resistor, a first terminal of the first resistor, a first input terminal of the second comparator module, and the third switch module The second end of the Hall switch is connected to the second pin after being combined, and the second end of the first resistor is grounded; the output end of the Hall switch is connected to the first end of the second resistor, and the second end of the second resistor is connected to the ground. The two terminals are combined with the positive electrode of the second light emitting diode module and then connected to the second pin, and the negative electrode of the second light emitting diode module is grounded; the resistance value of the first resistor, the resistance of the second resistor The value and the output voltage value of the Hall switch satisfy the following condition: within the third time period, under the action of the output voltage of the Hall switch, the state of the second LED module is non-conductive.

Wherein, for the Hall switch, the output voltage during its operation may be two different voltage values (the first preset voltage and the second preset voltage), and in the third time period, the Hall switch Under the action of the output voltage of the second light-emitting diode module, the state of the second light-emitting diode module is non-conductive means: no matter the output voltage of the Hall switch is the first preset voltage or the second preset voltage, the second light-emitting diode module will not The three time periods are turned on.

Wherein, since the output terminal of the Hall switch is not directly connected to the second pin, but is connected to a second resistor, under the isolation effect of the second resistor, the fourth input voltage in the second drive circuit will not be affected. The output of the Hall switch has an effect.

It can be seen that in this example, the output terminal of the Hall switch is connected to the second resistor, and the resistance value of the first resistor, the resistance value of the second resistor and the output voltage value of the Hall switch meet the following conditions: in the third time period, the Hall switch Under the action of the output voltage of the Er switch, the state of the second light-emitting diode module is non-conductive, which is beneficial to ensure the reliability of the system operation.

In a possible example, the resistance value of the first resistor, the resistance value of the second resistor and the output voltage value of the Hall switch satisfy the following conditions:

V*R1/(R1+R2)<Vth;

Wherein, V is the output voltage of the Hall switch, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, and Vth is the turn-on voltage value of the second LED module.

Specifically, the output voltage V of the first Hall switch may include: a first preset voltage Vh and a second preset voltage Vl, wherein the voltage value of the first preset voltage Vh is greater than the voltage value of the second preset voltage Vl . Then Vh and Vl should meet the following conditions:

Vh*R1/(R1+R2)<Vth;

Vl*R1/(R1+R2)<Vth;

In addition, the output voltage of the Hall switch, the resistance value of the first resistor, the resistance value of the second resistor, and the voltage value of the fifth input voltage should specifically meet the following conditions:

Vref<Vh*R1/(R1+R2);

Vref>Vl*R1/(R1+R2);

Wherein, Vref is the voltage value of the fifth input voltage. Through the settings of the above voltage values and resistance values, the function of Hall switch state detection can be realized, and mutual influence between the Hall detection circuit and the second drive circuit can be avoided.

It can be seen that in this example, the resistance value of the first resistor, the resistance value of the second resistor, and the output voltage value of the Hall switch meet certain conditions, which is beneficial to ensure that the output voltage of the Hall switch is The lighting of the second light-emitting diode is not erroneously influenced.

In a possible example, referring to FIG. 6 , the key detection circuit further includes a third resistor, the first end of the first switch module is connected to the first end of the third resistor, and the first end of the third resistor One end is connected to the first power supply module.

In specific implementation, the button can be a switch with one end connected to the ground and the other end connected to the first pin. When the button is pressed, the switch is closed. At this time, the voltage of the first pin will be pulled down to the ground, and a third resistor is added to limit the voltage. The flow can prevent the first power supply module from being pulled down to the ground after the button is pressed.

It can be seen that in this example, a third resistor is provided between the first power supply module and the first switch module, which is beneficial to ensure circuit safety.

In a possible example, referring to FIG. 7 , the first driving circuit further includes a first current source, and an output port of the first current source is connected to the first end of the second switch module.

It can be seen that in this example, the first terminal of the second switch module is connected to the current source, which is beneficial to ensure that the driving current is controllable when the first driving circuit is working, and to improve the working reliability of the system.

In a possible example, referring to FIG. 8 , the second driving circuit further includes a second current source, and an output port of the second current source is connected to the first terminal of the third switch module.

It can be seen that in this example, the first end of the third switch module is connected to the current source, which is beneficial to ensure that the driving current is controllable when the second driving circuit is working, and improves the reliability of the system.

The following will be described in conjunction with specific examples.

Please refer to Figure 9, the control chip in Figure 9 includes: a control module, a key detection module, a Hall detection module, a first comparator C1, a second comparator C2, a first switch S1, a second switch S2, and a third switch S3 , the first current source I1, the second current source I2, the first resistor R01, the second resistor R02, the third resistor R03, the first pin (shown as KEY), the second pin (shown as lead foot HALL);

Wherein, the control module is respectively connected to the control port of the button detection module, the control port of the Hall detection module, the control port of the first switch S1, the control port of the second switch S2, the control port of the third switch S3, the first switch S1 One end is connected to the first end of the third resistor R03, the input voltage of the second end of the third resistor R03 is VCC2, the first end of the second switch S2 is connected to the first current source I1, and the output voltage of the first current source I1 is VCC1, the first end of the third switch S3 is connected to the second current source I2, the output voltage of the second current source I2 is VCC3, the first end of the button detection module is connected to the output end of the first comparator C1, the first comparator The first input end of C1, the second end of the first switch S1, and the second end of the second switch S2 are combined and then connected to the first pin, and the first end of the Hall detection module is connected to the output end of the second comparator C2 , the first input end of the second comparator C2, the second end of the third switch S3, and the first end of the first resistor R01 are combined and then connected to the second pin, the input voltage of the second input end of the first comparator C1 Vref1, the input voltage of the second input terminal of the second comparator C2 is Vref2;

The first pin KEY is used to connect the first light-emitting diode D1 and the button, and the second pin HALL is used to connect the second light-emitting diode D2 and the Hall switch, specifically, the anode of the first light-emitting diode D1 and the first end of the button Connect the first pin KEY after combining, the negative pole of the first light-emitting diode D1 is grounded, the second end of the button is grounded, the output end of the Hall switch is connected to the first end of the second resistor R02, and the second end of the second resistor R02 After combined with the anode of the second light emitting diode D2, it is connected to the second pin HALL, and the cathode of the second light emitting diode D2 is grounded.

Taking the first state as the charging state and the second state as the discharging state, that is, the first light-emitting diode D1 is the charging light, and the second light-emitting diode D2 is the discharge light as an example, the working process of each component of the control chip is as follows:

Wherein, the minimum conduction voltage of the first LED D1 is Vth1, the minimum conduction voltage of the second LED D2 is Vth, the voltage of the first pin KEY is V1, and the voltage of the second pin HALL is V2.

The button detection function on the first pin KEY and the multiplexing timing of the charging lamp, that is, the distribution of the first time period (that is, the following t1 time period) and the second time period (that is, the following t2 time period) in the first cycle T1 is as follows As shown in FIG. 10 , the high level is the enabled state, and the low level is the inactive state as an example.

During the time period t1, the control module enables the first switch S1 and the key detection module, disables the second switch S2, that is, turns off the first driving circuit, and enables the key detection circuit. During the period of t1, the first pin KEY is pulled up to VCC2, and VCC2<Vth1, at this time the charging lamp will not be lit. If the key is pressed, the voltage V1 on the first pin KEY will be pulled to be less than Vref1, and the key detection circuit will detect that the key is pressed at this time.

During the time period t2, the control module enables the second switch S2, disables the first switch S1 and the key detection module, that is, turns off the key detection circuit, and enables the first driving circuit. During the time period t2, the first current source I1 is turned on, and the first pin KEY is driven to a high level VCC1, and VCC1>Vth1, at this time, the first light-emitting diode D1 (that is, the charging lamp) is turned on. When the charging device is in the charging state, the first light-emitting diode D1 will be lit once in the t2 time period of each first cycle. Due to the persistence of vision effect of people, the human eye will see that the first light-emitting diode D1 is continuously lit state.

The Hall detection function on the second pin HALL and the multiplexing sequence of the discharge lamp, that is, the distribution of the third time period (the following t3 time period) and the fourth time period (the following t4 time period) in the second cycle T2 are shown in the figure 11, taking the high level as the enabled state and the low level as the inactive state as an example.

During the time period t4, the control module enables the third switch S3 and disables the Hall detection module, that is, turns off the Hall detection circuit and enables the second drive circuit. The second driving circuit will drive the voltage of the second pin HALL to a high level, and VCC3>Vth, the second light emitting diode D2 (that is, the discharge lamp) is turned on. When the first resistor R01 and the second resistor R02 are large enough, and the current flowing through the first resistor R01 and the second resistor R02 is much smaller than the current of the second light-emitting diode D2, the Hall switch output voltage V3 will hardly affect the voltage of V2 , and will not affect the lighting of the second light emitting diode D2. And because of the resistance isolation of the second resistor R02, the Hall switch output voltage V3 will not be affected by V2. When the charging device is in the discharging state, the second light-emitting diode D2 will be lit once in the t4 time period of each second cycle. Due to the persistence of vision effect of people, the human eyes will see that the second light-emitting diode D2 is always on. .

During the time period t3, the control module disables the third switch S3, enables the Hall detection module, that is, enables the Hall detection circuit, and turns off the second driving circuit. At this time, the second pin HALL is only driven by the Hall switch. During the time period t3, the second comparator C2 compares the high and low level information output by the Hall switch and then outputs it to the Hall detection module. When the Hall switch is driven to a high level VH, select the resistance values of the first resistor R01 and the second resistor R02 so that V2<Vth, the second light-emitting diode D2 will not conduct, the current of the second light-emitting diode D2 is very small, and the first The two light emitting diodes D2 hardly affect the voltage of V2, at this time V2=VH*R01/(R01+R02). The reference level of the second comparator C2 (that is, the input voltage of the second input terminal) Vref2<VH*R01/(R01+R02), when the output voltage of the Hall switch is VH, the second comparator C2 outputs a high level. When the Hall switch is driven to a low level VL, the second light emitting diode D2 will not be turned on at this time, V2=VL*R01/(R01+R02). The reference level Vref2 of the second comparator C2>VL*R01/(R01+R02), when the output voltage of the Hall switch is VL, the second comparator C2 outputs a low level.

Example 2:

This embodiment provides a charging device for a Bluetooth headset, including the control chip as described in Embodiment 1.

It can be seen that in the Bluetooth earphone charging device provided by the present application, the control chip can realize button detection, Hall switch detection, and lighting of the charging and discharging prompt light through two pins, which is beneficial to save the cost of the control chip and the Bluetooth earphone charging device. cost.

The above descriptions are only some implementations of the present application. It should be pointed out that for those of ordinary skill in the art, some improvements and modifications can be made without departing from the principle of the application. These improvements and modifications are also It should be regarded as the protection scope of this application.

Claims

A control chip, which is applied to a charging device for a Bluetooth headset, is characterized in that it includes: a control module, a key detection circuit, a Hall detection circuit, a first drive circuit, a second drive circuit, a first pin and a second pin ;

The control module is respectively connected to the control port of the key detection circuit, the control port of the first drive circuit, the control port of the second drive circuit and the control port of the Hall detection circuit, and the key detection circuit The first end of the first drive circuit is connected to the first pin, the first pin is used to connect the first light-emitting diode module and the button, and the first end of the Hall detection circuit , the first end of the second driving circuit is connected to the second pin, and the second pin is used to connect the second light emitting diode module and the Hall switch;

The control module is used to enable the key detection circuit in the first time period of each first cycle, and detect the state of the key through the key detection circuit;

The control module is further configured to enable the first driving circuit in the second time period of each first cycle, and when the first driving circuit is in an enabled state and the charging device is the first In a state, control the first driving circuit to light up the first light-emitting diode module;

The control module is further configured to enable the Hall detection circuit in the third time period of each second cycle, and detect the state of the Hall switch through the Hall detection circuit;

The control module is further configured to enable the second drive circuit in the fourth time period of each second cycle, and when the second drive circuit is in an enabled state and the charging device is the first In the second state, control the second drive circuit to light up the second light emitting diode module;

Wherein, the first time period does not overlap with the second time period, and the third time period does not overlap with the fourth time period; the first state is any one of a charging state and a discharging state , the second state is another one of the charging state and the discharging state except the first state.
The control chip according to claim 1, wherein the key detection circuit comprises: a key detection module, a first comparator module, and a first switch module; the first drive circuit comprises a second switch module;

The control module is connected to the control port of the key detection module, the control port of the first switch module and the control port of the second switch module; the input voltage of the first terminal of the first switch module is the first Input voltage, the input voltage of the first end of the second switch module is the second input voltage, the second end of the first switch module, the second end of the second switch module and the first comparator The first input terminal of the module is combined and connected to the first pin, the input voltage of the second input terminal of the first comparator module is the third input voltage, and the output terminal of the first comparator module is connected to the The first end of the button detection module;

The key detection module is used to determine the state of the key according to the output of the first comparator module, and the control module is used to enable the key detection module within the first time period and control the The first switch module is turned on, and the state of the button is detected through the button module;

The control module is further configured to enable the second switch module within the second time period, and when the second switch module is in an enabled state and the charging device is in the first state, and controlling the second switch module to conduct.
The control chip according to claim 1 or 2, wherein the Hall detection circuit includes: a Hall detection module and a second comparator module, and the second drive circuit includes a third switch module;

The control module is connected to the control port of the Hall detection module and the control port of the third switch module; the input voltage of the first terminal of the third switch module is a fourth input voltage, and the third switch module The second terminal of the second comparator module is combined with the first input terminal of the second comparator module and then connected to the second pin, the input voltage of the second input terminal of the second comparator module is the fifth input voltage, and the The output end of the second comparator module is connected to the first end of the Hall detection module;

The Hall detection module is used to determine the state of the Hall switch according to the output of the second comparator module, and the control module is used to enable the Hall detection module within the third time period, Detecting the state of the Hall switch through the Hall detection module;

The control module is further configured to enable the third switch module within the fourth time period, and when the third switch module is in an enabled state and the charging device is in the second state, and controlling the third switch module to conduct.
The control chip according to claim 2, wherein the anode of the first LED module is combined with the first end of the button and then connected to the first pin, and the first LED module is connected to the first pin. The negative pole and the second end of the button are grounded;

The voltage value of the first input voltage is smaller than the conduction voltage value of the first LED module, and the voltage value of the second input voltage is greater than the conduction voltage value of the first LED module.
The control chip according to claim 3, wherein the control chip further comprises a first resistor, the first end of the first resistor, the first input end of the second comparator module and the first The second end of the three-switch module is combined and connected to the second pin, and the second end of the first resistor is grounded;

The output end of the Hall switch is connected to the first end of the second resistor, and the second end of the second resistor is connected to the second pin after being combined with the anode of the second light-emitting diode module. The negative electrode of the second light-emitting diode module is grounded;

The resistance value of the first resistor, the resistance value of the second resistor, and the output voltage value of the Hall switch meet the following conditions: within the third time period, when the output voltage of the Hall switch acts Next, the state of the second LED module is non-conductive.
The control chip according to claim 5, wherein the resistance value of the first resistor, the resistance value of the second resistor and the output voltage value of the Hall switch satisfy the following conditions:

V*R1/(R1+R2)<Vth;

Wherein, V is the output voltage of the Hall switch, R1 is the resistance value of the first resistor, R2 is the resistance value of the second resistor, and Vth is the turn-on voltage value of the second LED module.
The control chip according to claim 2, wherein the key detection circuit further includes a third resistor, the first end of the first switch module is connected to the first end of the third resistor, and the third The first end of the resistor is connected to the first power supply module.
The control chip according to claim 2, wherein the first driving circuit further comprises a first current source, an output port of the first current source is connected to the first terminal of the second switch module.
The control chip according to claim 3, wherein the second driving circuit further includes a second current source, an output port of the second current source is connected to the first terminal of the third switch module.
A charging device for a Bluetooth headset, comprising the control chip according to any one of claims 1-9.