CN108900949A - A kind of main control chip of automobile data recorder and its loadtype recognition methods - Google Patents
A kind of main control chip of automobile data recorder and its loadtype recognition methods Download PDFInfo
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- CN108900949A CN108900949A CN201810421383.8A CN201810421383A CN108900949A CN 108900949 A CN108900949 A CN 108900949A CN 201810421383 A CN201810421383 A CN 201810421383A CN 108900949 A CN108900949 A CN 108900949A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2430/00—Signal processing covered by H04R, not provided for in its groups
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Abstract
The invention belongs to audio driven technical field, main control chip and its loadtype recognition methods of a kind of automobile data recorder are provided.Wherein, existing three audio output pins are merged into the first audio output pin and the second audio output pin by the main control chip of automobile data recorder, first audio output pin can be separately as the audio output pin of operational amplifier circuit under Single-end output mode, also it can be used as a difference positive signal output pin of differential amplifier circuit under difference output mode, and connecting inner circuit and external loading scheme, automatic identification audio output mode is to drive load, to reduce the number of pins of main control chip, improve pin utilization rate, the application range of chip is improved simultaneously.
Description
Technical field
The invention belongs to audio driven technical field more particularly to the main control chips and its load class of a kind of automobile data recorder
Type recognition methods.
Background technique
In order to cope with the different market demands, need the main control chip of multifunctional running recorder that can either directly drive loudspeaker
, and loudspeaker can be driven indirectly by power amplifier.When directly driving loudspeaker, main control chip uses difference output mode, i.e., logical
It crosses internal high-power output difference circuit and carrys out output audio signal；In driving loudspeaker indirectly, main control chip is using single-ended defeated
Mode out, i.e., by the operational amplifier circuit of internal single-ended weak power output come output audio signal.
In the prior art, it needs to reserve three audio output pins on main control chip：Two needed for difference output mode
Single-end output pin needed for difference output pin and Single-end output mode.Pin is more, and pin utilization rate is low.
Summary of the invention
The main control chip for being designed to provide a kind of automobile data recorder of the embodiment of the present invention, it is intended to solve the prior art and mention
The main control chip of the automobile data recorder of confession needs three audio output pins, and pin is more, the low problem of pin utilization rate.
The embodiments of the present invention are implemented as follows, a kind of main control chip of automobile data recorder, including differential amplifier circuit and
Operational amplifier circuit, the main control chip further include：
First audio output pin, the first audio output pin connect the output end of the operational amplifier circuit, the amplifier electricity
The output end on road is also connected with the difference positive output end of the differential amplifier circuit；
Second audio output pin, the second audio output pin connect the difference negative output terminal of the differential amplifier circuit,
The second audio output pin is respectively provided with opposite logic level under difference output mode and Single-end output mode；
Interface circuit, the interface circuit connect the second audio output pin；
Control circuit, for controlling the operational amplifier circuit output logic level after main control chip starts and according to the interface
The logic level selection for the second audio output pin that circuit is got is by the differential amplifier circuit or amplifier electricity
Output audio signal is carried out on road.
The another object of the embodiment of the present invention is to provide a kind of the negative of the main control chip of automobile data recorder as described above
Kind identification method is carried, the described method comprises the following steps：
Main control chip power-up initializing；
Control circuit controls operational amplifier circuit and exports logic level；
Interface circuit obtains the logic level of the second audio output pin；
Whether the logic level that control circuit judgement is got and the logic level that operational amplifier circuit exports are identical, are to identify load
For loudspeaker, selection is by differential amplifier circuit come output audio signal, and otherwise identification load is power amplifier, and selection is by operational amplifier circuit Lai defeated
Audio signal out.
When the main control chip of automobile data recorder as described above further includes internal bias circuit, the embodiment of the present invention it is another
One is designed to provide a kind of loadtype recognition methods of the main control chip of automobile data recorder, and the method includes following steps
Suddenly：
Main control chip power-up initializing；
Internal bias circuit is closed after the enabled lower opening predetermined time of control circuit；
Interface circuit obtains the logic level of the second audio output pin；
If the logic level obtained is high level, control circuit controls transmittal circuit outputs lower electrical level, and interface circuit obtains later
The logic level of the second audio output pin is taken, it is to know that whether the logic level that control circuit judgement is got, which is low level,
It Fu Zai not be loudspeaker, selection is by differential amplifier circuit come output audio signal, and otherwise identification load is power amplifier, and selection is by amplifier electricity
Output audio signal is carried out on road；
If the logic level obtained is low level, control circuit controls operational amplifier circuit and exports high level, and interface circuit obtains later
The logic level of the second audio output pin is taken, it is to know that whether the logic level that control circuit judgement is got, which is high level,
It Fu Zai not be loudspeaker, selection is by differential amplifier circuit come output audio signal, and otherwise identification load is power amplifier, and selection is by amplifier electricity
Output audio signal is carried out on road.
The another object of the embodiment of the present invention is to provide a kind of remained capacity driving circuit of automobile data recorder, including master
Chip is controlled, the main control chip is the main control chip of automobile data recorder as described above；
The remained capacity driving circuit further includes the mute driving circuit of power amplifier, and the second audio output pin passes through described
The mute pin of the mute driving circuit connection power amplifier of power amplifier, the audio that the first audio output pin connects the power amplifier are defeated
Enter pin.
In the embodiment of the present invention, existing three audio output pins are merged into first by the main control chip of automobile data recorder
Audio output pin and the second audio output pin, wherein the first audio output pin can be separately as Single-end output mode
The audio output pin of lower operational amplifier circuit, the difference positive signal that also can be used as differential amplifier circuit under difference output mode are defeated
Pin out, and connecting inner circuit and external loading scheme, automatic identification audio output mode is to drive load, to reduce
The number of pins of main control chip improves pin utilization rate, while improving the application range of chip.
Detailed description of the invention
Fig. 1 is the circuit diagram of the main control chip for the automobile data recorder that the embodiment of the present invention one provides；
Fig. 2 is the circuit diagram of the control circuit of the main control chip for the automobile data recorder that the embodiment of the present invention one provides；
Fig. 3 is application circuit of the main control chip for the automobile data recorder that the embodiment of the present invention one provides under difference output mode
Figure；
Fig. 4 is application circuit of the main control chip for the automobile data recorder that the embodiment of the present invention one provides under Single-end output mode
Figure；
Fig. 5 is a kind of circuit diagram of the mute driving circuit of power amplifier in the embodiment of the present invention one；
Fig. 6 is the circuit diagram of the main control chip of automobile data recorder provided by Embodiment 2 of the present invention；
Fig. 7 is a kind of circuit diagram of internal bias circuit in the embodiment of the present invention two；
Fig. 8 is application circuit of the main control chip of automobile data recorder provided by Embodiment 2 of the present invention under Single-end output mode
Figure；
Fig. 9 is the flow chart of the loadtype recognition methods of the main control chip for the automobile data recorder that the embodiment of the present invention three provides；
Figure 10 is the flow chart of the loadtype recognition methods of the main control chip for the automobile data recorder that the embodiment of the present invention four provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In view of the problems of the existing technology, the invention proposes a kind of main control chip of automobile data recorder, the master control cores
Existing three audio output pins are merged into two audio output pins, connecting inner circuit and external loading scheme by piece,
Automatic identification audio output mode is to drive load.
Embodiment one
The embodiment of the present invention one proposes a kind of main control chip of automobile data recorder, as shown in Figure 1.
The main control chip 1 for the automobile data recorder that the embodiment of the present invention one provides includes differential amplifier circuit 13 and operational amplifier circuit
14, further include：First audio output pin VOUTP, the output end of the first audio output pin VOUTP connection operational amplifier circuit 14,
The output end of operational amplifier circuit 14 is also connected with the difference positive output end of differential amplifier circuit 13；Second audio output pin VOUTN, the
The difference negative output terminal of two audio output pin VOUTN connection differential amplifier circuits 13, the second audio output pin VOUTN is in difference
Opposite logic level is respectively provided under point way of output and Single-end output mode；Interface circuit 12, the connection of interface circuit 12 the
Two audio output pin VOUTN；Control circuit 11,11 connecting interface circuit 12 of control circuit, differential amplifier circuit 13 and amplifier
Circuit 14 is got for the control operational amplifier circuit 14 output logic level after the starting of main control chip 1 and according to interface circuit 12
The second audio output pin VOUTN logic level selection exported by differential amplifier circuit 13 or operational amplifier circuit 14 audio letter
Number.
Preferably, interface circuit 12 is universal input/output（GPIO）Interface circuit.
Preferably, differential amplifier circuit 13 is D class power amplifier or AB class power amplifier.
Fig. 2 shows the circuits of the control circuit 11 of the main control chip 1 of the automobile data recorder of the offer of the embodiment of the present invention one.
Specifically, control circuit 11 may include：Differential driving enables circuit 112；Amplifier drives enabled circuit 113；D/A
Conversion circuit 114, for exporting analog audio data to operational amplifier circuit 14 or differential amplifier circuit 13；Level control circuit 115,
For the control operational amplifier circuit 14 output logic level after the starting of main control chip 1；Level sensitive circuit 111, for according to interface
The logic level selection differential driving for the second audio output pin VOUTN that circuit 12 is got enables circuit 112 and enables difference
13 output audio signal of amplifying circuit or selection amplifier drive enabled circuit 113 to enable 14 output audio signal of operational amplifier circuit.
In embodiment one, existing three audio output pins are merged into the first sound by the main control chip 1 of automobile data recorder
Frequency output pin VOUTP and the second audio output pin VOUTN, wherein the first audio output pin VOUTP can be separately as
The audio output pin of operational amplifier circuit 14 under Single-end output mode, also can be used as differential amplifier circuit 13 under difference output mode
One difference positive signal output pin.After control circuit 11 starts master control chip 1, operational amplifier circuit 14 exports a certain logic electricity
It is flat, so that the second audio output pin VOUTN has the logic level under difference output mode, and in Single-end output mode
Under, by the external bias circuit for the main control chip 1 being connect with the second audio output pin VOUTN by the second audio output pin
VOUTN is placed in opposite logic level.In this way, control circuit 11 is high level according to the logic level that interface circuit 12 is got
Or low level, can intelligent recognition go out load audio output type, to select differential amplifier circuit 13 or operational amplifier circuit 14
Output audio signal.
Fig. 3 shows the main control chip 1 of the automobile data recorder of the offer of the embodiment of the present invention one under difference output mode
Application circuit；Fig. 4 shows the main control chip 1 of the automobile data recorder of the offer of the embodiment of the present invention one under Single-end output mode
Application circuit.
After starting master control chip 1 with D/A switch circuit 114, for operational amplifier circuit 14 exports high level, such as Fig. 3
It is shown.Under difference output mode, two audio signal input ends of loudspeaker load are directly connected to the first audio output respectively and draw
Foot VOUTP and the second audio output pin VOUTN.Since the impedance of loudspeaker load is usually 8 ohm or 4 ohm, second
It is high level that the level of audio output pin VOUTN can be drawn by the first audio output pin VOUTP, and interface circuit 12 will acquire
High level be sent to level sensitive circuit 111, level sensitive circuit 111 selects differential driving to enable circuit according to the high level
112 enabled 13 output audio signals of differential amplifier circuit.
As shown in figure 4, driving loudspeaker to load indirectly by power amplifier under Single-end output mode, at this point, the second audio output is drawn
Foot VOUTN connects the mute pin of power amplifier, the first audio output pin VOUTP connection function by the mute driving circuit 2 of power amplifier
The audio input pin put, external bias circuit of the mute driving circuit 2 of power amplifier as main control chip 1.The mute drive of power amplifier
Second audio output pin VOUTN can be pulled down to low level, in this way, interface circuit after the starting of main control chip 1 by dynamic circuit 2
12 low levels that will acquire are sent to level sensitive circuit 111, and level sensitive circuit 111 selects amplifier to drive according to the low level
Dynamic enabled circuit 113 enables 14 output audio signal of operational amplifier circuit.
Under such application, needs the mute driving circuit 2 of power amplifier to have and drag down the second audio output pin VOUTN logic
The function of level, as an outside pull-down circuit, as Fig. 5 shows the mute driving circuit 2 of power amplifier in the embodiment of the present invention one
A kind of circuit.
Specifically, the mute driving circuit 2 of power amplifier may include：Triode Q1, first resistor R1 and the second resistance of NPN type
R2.The base stage of triode Q1 connects the second audio output pin VOUTN and is grounded by first resistor R1, the collection of triode Q1
Electrode passes through second resistance R2 connection direct current VCC and connects the mute pin of power amplifier, the emitter ground connection of triode Q1.This
Sample, after the starting of main control chip 1, the second audio output pin VOUTN can be pulled down to low level by first resistor R1.Later
During driving power amplifier, the second audio output pin VOUTN will make to can control pin as mute, draw in the second audio output
When foot VOUTN exports low level, triode Q1 cut-off, the mute pin of power amplifier fills height by direct current VCC, in the second audio output
When pin VOUTN exports high level, triode Q1 conducting, the mute pin put is dragged down by triode, and power amplifier is planted according to itself
Class determines to realize mute function when mute pin is high level or low level.
Certainly, if D/A switch circuit 114 make master control chip 1 start after, operational amplifier circuit 14 export low level, then make
Should have for the mute driving circuit 2 of the power amplifier of the external bias circuit of main control chip 1 and draw high the second audio output pin VOUTN
The function of logic level, as an outside pull-up circuit.
Embodiment two
The embodiment of the present invention two proposes a kind of main control chip of automobile data recorder, as shown in Figure 6.It is different from embodiment one
It is that in embodiment two, main control chip 1 can also further comprise on the basis of example 1：It is connected to control circuit 11 and
Internal bias circuit 15 between two audio output pin VOUTN, internal bias circuit 15 dragged down under Single-end output mode or
Draw high the level of the second audio output pin VOUTN.
In embodiment two, the structure of control circuit 11 is as described in embodiment one, then internal bias circuit 15 is specifically to connect
Level control circuit 115, level control circuit 115 export enable signal under Single-end output mode, so that internal bias circuit
15 work, so that the level of the second audio output pin VOUTN is set to high level or low level.
In one case, if operational amplifier circuit 14 exports high electricity after level control circuit 115 starts master control chip 1
Flat, then internal bias circuit 15 is specially an inside pull-down circuit.In this way, the second audio output is drawn under difference output mode
It is high level that the level of foot VOUTN can be drawn by the first audio output pin VOUTP, and under Single-end output mode, inside drop-down
Circuit draws the level of the second audio output pin VOUTN for low level.
At this point, as shown in fig. 7, internal bias circuit 15 may include：3rd resistor R3 and NMOS tube Q2.Wherein, NMOS tube
The source electrode of Q2 is grounded, and the drain electrode of NMOS tube Q2 passes through 3rd resistor R3 connection the second audio output pin VOUTN, NMOS tube Q2's
Grid connects control circuit 11, specifically connection number/analog conversion circuit 114.D/A switch circuit 114 is in Single-end output mode
Lower output enable signal so that NMOS tube Q2 is connected, and then the level of the second audio output pin VOUTN is dragged down.
In another case, if level control circuit 115 make master control chip 1 start after, operational amplifier circuit 14 exports low
Level, then internal bias circuit 15 is specially an inside pull-up circuit.In this way, under difference output mode, the second audio output
It is low level that the level of pin VOUTN can be drawn by the first audio output pin VOUTP, and under Single-end output mode, on inside
Puller circuit draws the level of the second audio output pin VOUTN for high level.
Application circuit such as embodiment of the main control chip 1 for the automobile data recorder that embodiment two provides under difference output mode
Described in one, do not repeat.
Application circuit such as Fig. 8 institute of the main control chip 1 for the automobile data recorder that embodiment two provides under Single-end output mode
Show.
Embodiment three
The loadtype that the embodiment of the present invention three provides a kind of main control chip of automobile data recorder as described in embodiment one is known
Other method, as shown in figure 9, including the following steps：
S11：Main control chip 1 is powered on and initialized, at this point, the second audio output pin is set to read states.
S12：Control circuit 11 controls operational amplifier circuit 14 and exports logic level.
S13：Interface circuit 12 obtains the logic level of the second audio output pin.
S14：Whether the logic level that the judgement of control circuit 11 is got and the logic level that operational amplifier circuit 14 exports are identical,
It is to then follow the steps S15, it is no to then follow the steps S16.
S15：The identification load of control circuit 11 is loudspeaker, and the selection of control circuit 11 exports audio by differential amplifier circuit 13
Signal.
S16：The identification load of control circuit 11 is power amplifier, and the selection of control circuit 11 is exported audio letter by operational amplifier circuit 14
Number.
Example IV
The loadtype that the embodiment of the present invention four provides a kind of main control chip of automobile data recorder as described in embodiment two is known
Other method includes the following steps as shown in Figure 10：
S201：Main control chip 1 is powered on and initialized.
S202：Internal bias circuit 15 is closed after the enabled lower opening predetermined time t of control circuit 11, so that second
Audio output pin is set to high level or low level.
S203：Interface circuit 12 obtains the logic level of the second audio output pin.
S204：If the logic level that step S203 is obtained is high level, there may be following several situations：A, internal inclined
Circuits 15 is internal pull-up circuits and main control chip 1 is without external bias circuit；B, internal bias circuit 15 is internal pull-up electricity
Road and there are external pull-up circuits for main control chip 1；C, internal bias circuit 15 is internal pull-down circuit and main control chip 1 exists
External pull-up circuit.At this point, control circuit 11, which controls operational amplifier circuit 14, exports low level.
S205：Interface circuit 12 obtains the logic level of the second audio output pin.
S206：Control circuit 11 judges whether the logic level got is low level, is to then follow the steps S207, otherwise
Execute step S208.
S207：The identification load of control circuit 11 is loudspeaker, and the selection of control circuit 11 exports sound by differential amplifier circuit 13
Frequency signal.
S208：The identification load of control circuit 11 is power amplifier, and the selection of control circuit 11 is exported audio letter by operational amplifier circuit 14
Number.
S209：If the logic level that step S203 is obtained is low level, there may be following several situations：A, internal inclined
Circuits 15 is internal pull-down circuits and main control chip 1 is without external bias circuit；B, internal bias circuit 15 is internal drop-down electricity
Road and there are external pull-down circuits for main control chip 1；C, internal bias circuit 15 is internal pull-up circuit and main control chip 1 exists
External pull-down circuit.At this point, control circuit 11, which controls operational amplifier circuit 14, exports high level.
S210：Interface circuit 12 obtains the logic level of the second audio output pin.
S211：Control circuit 11 judges whether the logic level got is high level, is to then follow the steps S212, otherwise
Execute step S213.
S212：The identification load of control circuit 11 is loudspeaker, and the selection of control circuit 11 exports sound by differential amplifier circuit 13
Frequency signal.
S213：The identification load of control circuit 11 is power amplifier, and the selection of control circuit 11 is exported audio letter by operational amplifier circuit 14
Number.
Embodiment five
The embodiment of the present invention five provides a kind of remained capacity driving circuit of automobile data recorder, including main control chip 1, Yi Jiyu
The mute driving circuit 2 of the power amplifier of second audio output pin VOUTN connection of main control chip 1, main control chip 1 and power amplifier it is quiet
Sound driving circuit 2 as described in embodiment one, does not repeat.
In conclusion the main control chip 1 of automobile data recorder provided in an embodiment of the present invention is by existing three audio output
Pin merges into the first audio output pin VOUTP and the second audio output pin VOUTN, wherein the first audio output pin
VOUTP both can also can be used as difference output mode separately as the audio output pin of operational amplifier circuit 14 under Single-end output mode
One difference positive signal output pin of lower differential amplifier circuit 13 improves to reduce the number of pins of main control chip 1
Pin utilization rate, while improving the application range of chip.After control circuit 11 starts master control chip 1, operational amplifier circuit 14
A certain logic level is exported, so that the second audio output pin VOUTN has the logic level under difference output mode, and
Under Single-end output mode, by the internal or external circuit that is connect with the second audio output pin VOUTN by the second audio output
Pin VOUTN is placed in opposite logic level.In this way, control circuit 11 is height according to the logic level that interface circuit 12 is got
Level or low level, can intelligent recognition go out load audio output type, thus select differential amplifier circuit 13 or amplifier electricity
14 output audio signal of road.
Those of ordinary skill in the art will appreciate that implement the method for the above embodiments be can be with
Relevant hardware is controlled by program to complete, the program can be stored in a computer readable storage medium,
The storage medium, such as ROM/RAM, disk, CD.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of main control chip of automobile data recorder, including differential amplifier circuit and operational amplifier circuit, which is characterized in that the master control
Chip further includes：
First audio output pin, the first audio output pin connect the output end of the operational amplifier circuit, the amplifier electricity
The output end on road is also connected with the difference positive output end of the differential amplifier circuit；
Second audio output pin, the second audio output pin connect the difference negative output terminal of the differential amplifier circuit,
The second audio output pin is respectively provided with opposite logic level under difference output mode and Single-end output mode；
Interface circuit, the interface circuit connect the second audio output pin；
Control circuit, for controlling the operational amplifier circuit output logic level after main control chip starts and according to the interface
The logic level selection for the second audio output pin that circuit is got is by the differential amplifier circuit or amplifier electricity
Output audio signal is carried out on road.
2. the main control chip of automobile data recorder as described in claim 1, which is characterized in that the control circuit includes：
Differential driving enables circuit；
Amplifier drives enabled circuit；
D/A switch circuit, for exporting analog audio data to the operational amplifier circuit or the differential amplifier circuit；
Level control circuit, for controlling the operational amplifier circuit output logic level after main control chip starts；
Level sensitive circuit, the logic level choosing of the second audio output pin for being got according to the interface circuit
The enabled circuit of the differential driving is selected to enable the differential amplifier circuit output audio signal or select the amplifier driving enabled
Circuit enables the operational amplifier circuit output audio signal.
3. the main control chip of automobile data recorder as described in claim 1, which is characterized in that the main control chip further includes：
The internal bias circuit being connected between the control circuit and the second audio output pin, in Single-end output
The level of the second audio output pin is dragged down or drawn high under mode.
4. the main control chip of automobile data recorder as claimed in claim 3, which is characterized in that the internal bias circuit includes：
3rd resistor R3 and NMOS tube Q2；
The source electrode of the NMOS tube Q2 is grounded, and the drain electrode of the NMOS tube Q2 passes through 3rd resistor R3 connection second sound
The grid of frequency output pin, the NMOS tube Q2 connects the control circuit.
5. such as the main control chip of the described in any item automobile data recorders of Claims 1-4, which is characterized in that the interface circuit
It is universal input/output interface circuit.
6. such as the main control chip of the described in any item automobile data recorders of Claims 1-4, which is characterized in that the differential amplification
Circuit is D class power amplifier or AB class power amplifier.
7. a kind of loadtype recognition methods of the main control chip of automobile data recorder as claimed in claim 1 or 2, feature exist
In the described method comprises the following steps：
Main control chip power-up initializing；
Control circuit controls operational amplifier circuit and exports logic level；
Interface circuit obtains the logic level of the second audio output pin；
Whether the logic level that control circuit judgement is got and the logic level that operational amplifier circuit exports are identical, are to identify load
For loudspeaker, selection is by differential amplifier circuit come output audio signal, and otherwise identification load is power amplifier, and selection is by operational amplifier circuit Lai defeated
Audio signal out.
8. a kind of loadtype recognition methods of the main control chip of automobile data recorder as described in claim 3 or 4, feature exist
In the described method comprises the following steps：
Main control chip power-up initializing；
Internal bias circuit is closed after the enabled lower opening predetermined time of control circuit；
Interface circuit obtains the logic level of the second audio output pin；
If the logic level obtained is high level, control circuit controls transmittal circuit outputs lower electrical level, and interface circuit obtains later
The logic level of the second audio output pin is taken, it is to know that whether the logic level that control circuit judgement is got, which is low level,
It Fu Zai not be loudspeaker, selection is by differential amplifier circuit come output audio signal, and otherwise identification load is power amplifier, and selection is by amplifier electricity
Output audio signal is carried out on road；
If the logic level obtained is low level, control circuit controls operational amplifier circuit and exports high level, and interface circuit obtains later
The logic level of the second audio output pin is taken, it is to know that whether the logic level that control circuit judgement is got, which is high level,
It Fu Zai not be loudspeaker, selection is by differential amplifier circuit come output audio signal, and otherwise identification load is power amplifier, and selection is by amplifier electricity
Output audio signal is carried out on road.
9. a kind of remained capacity driving circuit of automobile data recorder, including main control chip, which is characterized in that the main control chip is
The main control chip of automobile data recorder as claimed in claim 1 or 2；
The remained capacity driving circuit further includes the mute driving circuit of power amplifier, and the second audio output pin passes through described
The mute pin of the mute driving circuit connection power amplifier of power amplifier, the audio that the first audio output pin connects the power amplifier are defeated
Enter pin.
10. the remained capacity driving circuit of automobile data recorder as claimed in claim 9, which is characterized in that the power amplifier it is quiet
Sound driving circuit includes：Triode Q1, first resistor R1 and the second resistance R2 of NPN type；
The base stage of the triode Q1 connects the second audio output pin and is grounded by the first resistor R1, described
The collector of triode Q1 is by the second resistance R2 connection direct current and connects the mute pin of the power amplifier, and described three
The emitter of pole pipe Q1 is grounded.
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| CN201810421383.8A CN108900949B (en) | 2018-05-04 | 2018-05-04 | Main control chip of automobile data recorder and load type identification method thereof |
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| CN201810421383.8A CN108900949B (en) | 2018-05-04 | 2018-05-04 | Main control chip of automobile data recorder and load type identification method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113259616A (en) * | 2021-04-14 | 2021-08-13 | 浙江华创视讯科技有限公司 | Control method and device of audio processing chip, electronic equipment and storage medium |
| CN114337311A (en) * | 2021-12-31 | 2022-04-12 | 深圳市华思旭科技有限公司 | Power supply circuit, output method of starting power supply and starting power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113259616A (en) * | 2021-04-14 | 2021-08-13 | 浙江华创视讯科技有限公司 | Control method and device of audio processing chip, electronic equipment and storage medium |
| CN113259616B (en) * | 2021-04-14 | 2021-10-15 | 浙江华创视讯科技有限公司 | Control method and device of audio processing chip, electronic equipment and storage medium |
| CN114337311A (en) * | 2021-12-31 | 2022-04-12 | 深圳市华思旭科技有限公司 | Power supply circuit, output method of starting power supply and starting power supply |
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| CN108900949B (en) | 2020-11-24 |
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