CN209486164U - Microcontroller power supply low-voltage detection circuit without A D interface and internal reference voltage - Google Patents
Microcontroller power supply low-voltage detection circuit without A D interface and internal reference voltage Download PDFInfo
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- CN209486164U CN209486164U CN201822124961.XU CN201822124961U CN209486164U CN 209486164 U CN209486164 U CN 209486164U CN 201822124961 U CN201822124961 U CN 201822124961U CN 209486164 U CN209486164 U CN 209486164U
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Abstract
The utility model discloses a kind of no A D interface and the microcontroller power supply low-voltage detection circuits of internal reference voltage, including single-chip microcontroller and resistor voltage divider circuit, the power supply terminal of single-chip microcontroller is connected with the positive VCC of external power supply, resistor voltage divider circuit one end is connected with the positive VCC of external power supply, the other end is connected with the earthing pole GND of external power supply jointly with the ground terminal of single-chip microcontroller, and the intermediate connection terminal of resistor voltage divider circuit is connected with the I/O detection terminal of single-chip microcontroller.The utility model I/O mouth using electric resistance partial pressure principle that the input of microcontroller power supply voltage signal is included, judge whether supply voltage is normal by I/O mouthfuls of low and high level threshold values, several resistance are only needed just to complete low voltage test function, hardware cost very little, loss is low, implements flexible and convenient, high reliablity.
Description
Technical field
The utility model relates to microcontroller power supply voltage detecting circuits, and in particular to a kind of no A D interface and internal reference electricity
The microcontroller power supply low-voltage detection circuit of pressure.
Background technique
For having the single-chip microcontroller of A D interface and internal reference voltage, detection low for supply voltage is very simple
It is single, because can directly be sampled to supply voltage by A D interface, so that it is determined that its specific value.
But many single-chip microcontrollers do not have A/D module and internal reference voltage on the market, select this type single-chip microcontroller to be because
Its cost performance is high, and cost is much lower than the single-chip microcontroller of included A/D module and internal reference voltage；In addition, included A/D module
And the single-chip microcontroller of internal reference voltage energy loss when using button cell power supply is relatively excessive, current loss one when AD is sampled
As reach 100 μ A or more, largely shorten battery in this way uses the time, exists to the selection of battery supply tired
It disturbs, and the I/O of single-chip microcontroller mouth is high impedance input, almost no power waste.So not with A D interface and internal reference voltage list
Piece machine has the very big scope of application, but such single-chip microcontroller is being selected also to bring a stubborn problem, that is, the low electricity of power supply
Pressure detection, if completing this function using external voltage comparator or other methods, hardware cost is just multiplied, relative to
It just attends to the trivialities and neglect the fundamentals for the single-chip microcontroller of included A/D module and internal reference voltage.Therefore, no A D interface and inside how to be realized
The power supply low voltage test of the single-chip microcontroller of reference voltage has become a technical problem urgently to be resolved.
Utility model content
The technical problems to be solved in the utility model: in view of the above problems in the prior art, provide a kind of no A D interface and
The microcontroller power supply low-voltage detection circuit of internal reference voltage, the utility model is using electric resistance partial pressure principle microcontroller power supply
The included I/O mouth of voltage signal input, judges whether supply voltage is normal by I/O mouthfuls of low and high level threshold values, and the method is only
There are several resistance just to complete low voltage test function, hardware cost very little, loss is low, implements flexible and convenient, high reliablity.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model are as follows:
The microcontroller power supply low-voltage detection circuit of a kind of no A D interface and internal reference voltage, including single-chip microcontroller and resistance
Bleeder circuit, the power supply terminal of the single-chip microcontroller are connected with the positive VCC of external power supply, described resistor voltage divider circuit one end and outer
The positive VCC of portion's power supply is connected, the other end is connected with the earthing pole GND of external power supply jointly with the ground terminal of single-chip microcontroller, institute
The intermediate connection terminal for stating resistor voltage divider circuit is connected with the I/O detection terminal of the single-chip microcontroller.
Optionally, one is equipped between the intermediate connection terminal of the resistor voltage divider circuit and the positive VCC of external power supply
Resistance.
Optionally, there are two being set between the intermediate connection terminal of the resistor voltage divider circuit and the positive VCC of external power supply
Or the resistance of more than two arranged in series.
Optionally, one is equipped between the intermediate connection terminal of the resistor voltage divider circuit and the earthing pole GND of external power supply
A resistance.
Optionally, two are equipped between the intermediate connection terminal of the resistor voltage divider circuit and the earthing pole GND of external power supply
The resistance of a or more than two arranged in series.
Compared to the prior art, the utility model has an advantage that the utility model includes single-chip microcontroller and electric resistance partial pressure
Circuit, the power supply terminal of the single-chip microcontroller are connected with the positive VCC of external power supply, resistor voltage divider circuit one end and external power supply
Positive VCC is connected, the other end is connected with the earthing pole GND of external power supply jointly with the ground terminal of single-chip microcontroller, electric resistance partial pressure electricity
The intermediate connection terminal on road is connected with the I/O detection terminal of the single-chip microcontroller, and the utility model is using electric resistance partial pressure principle single
The included I/O mouth of piece electromechanical source voltage signal input, judges whether supply voltage is normal by I/O mouthfuls of low and high level threshold values,
The utility model only needs several resistance just to complete low voltage test, and hardware cost very little, loss is low, it is flexible and convenient, reliable to implement
Property it is high.
Detailed description of the invention
Fig. 1 is the electrical block diagram of the utility model embodiment one.
Marginal data: 1, single-chip microcontroller；2, resistor voltage divider circuit.
Specific embodiment
Embodiment one:
As shown in Figure 1, single-chip microcontroller 1 power supply low-voltage detection circuit packet of the present embodiment without A D interface and internal reference voltage
Include single-chip microcontroller 1 and resistor voltage divider circuit 2(resistance R1~resistance R3 constituted), the power supply terminal of single-chip microcontroller 1 (label is in figure)
It is connected with the positive VCC of external power supply, 2 one end of resistor voltage divider circuit is connected with the positive VCC of external power supply, the other end and monolithic
The ground terminal (label is in figure) of machine 1 is connected with the earthing pole GND of external power supply jointly, the centre of resistor voltage divider circuit 2
Connection terminal A is connected with the I/O detection terminal of the single-chip microcontroller 1.
As shown in Figure 1, there are two being set between the intermediate connection terminal A of resistor voltage divider circuit 2 and the positive VCC of external power supply
The resistance R1 and R2 of arranged in series, furthermore between the intermediate connection terminal A of resistor voltage divider circuit 2 and the positive VCC of external power supply
Also it can according to need the resistance using more than two arranged in series.As shown in Figure 1, the intermediate connecting pin of resistor voltage divider circuit 2
A resistance R3 is equipped between sub- A and the earthing pole GND of external power supply.
The working principle of single-chip microcontroller 1 power supply low-voltage detection circuit of the present embodiment without A D interface and internal reference voltage is such as
Under: the power supply voltage signal of single-chip microcontroller 1 is inputted included I/O mouth using resistor voltage divider circuit 2 by the present embodiment, and monolithic is utilized
The I/O mouth of machine 1 has the detection arbitration functions of high-low voltage, by utilizing resistor voltage divider circuit 2 by I/O mouthfuls of detection voltage
The reference voltage for being depressured to the detection of I/O mouthfuls of high-low voltages is carried out, judges supply voltage by I/O mouthfuls of low and high level threshold values
It is whether normal, if the low voltage of supply voltage VCC will lead to I/O mouthfuls of voltages and change, so that I/O mouthfuls of detections
State changes, to detect that supply voltage VCC is too low, the present embodiment only needs several resistance just to complete low voltage test,
Hardware cost very little, loss is low, implements flexible and convenient, high reliablity, thus for the list not with A D interface and internal reference voltage
Piece machine provides a kind of simple, reliable, low-cost power detecting mode.Three resistance R1, R2, R3 resistance values in the present embodiment
Respectively 2k Ω, 1.8 k Ω, 1.8 k Ω, one I/O mouthfuls of the voltage signal access single-chip microcontroller 1 of R3 resistance；When the electricity of VCC
When pressure is 2.5V, the voltage of R3 is 0.8V, is detected as low level for I/O mouthfuls at this time, indicates that VCC supply voltage is too low, when the electricity of R3
Pressure is greater than 0.8V, and I/O mouthfuls are detected as high level, indicates that VCC supply voltage is normal.It should be noted that according to the electricity of single-chip microcontroller 1
Source requires the reference voltage of the detection of different and single-chip microcontroller 1 I/O mouth high-low voltage different, adjustable electric resistance partial pressure electricity
The resistance value of divider resistance meets the requirement of each single-chip microcontroller in road 2.
Embodiment two:
The present embodiment is basically the same as the first embodiment, main difference are as follows: in the present embodiment, resistor voltage divider circuit 2
A resistance is equipped between intermediate connection terminal A and the positive VCC of external power supply.
Embodiment three:
The present embodiment is basically the same as the first embodiment, main difference are as follows: in the present embodiment, resistor voltage divider circuit 2
Resistance there are two setting between intermediate connection terminal A and the earthing pole GND of external power supply, furthermore the centre of resistor voltage divider circuit 2 connects
Also it can according to need the resistance using more than two arranged in series between connecting terminal A and the earthing pole GND of external power supply.
The above is only the preferred embodiment of the utility model, and the protection scope of the utility model is not limited merely to
Above-described embodiment, technical solution belonging to the idea of the present invention belong to the protection scope of the utility model.It should refer to
Out, for those skilled in the art, it is without departing from the principle of the utility model it is several improvement and
Retouching, these improvements and modifications also should be regarded as the protection scope of the utility model.
Claims (5)
1. the microcontroller power supply low-voltage detection circuit of a kind of no A D interface and internal reference voltage, it is characterised in that: including list
The power supply terminal of piece machine (1) and resistor voltage divider circuit (2), the single-chip microcontroller (1) is connected with the positive VCC of external power supply, described
Resistor voltage divider circuit (2) one end is connected with the positive VCC of external power supply, the ground terminal of the other end and single-chip microcontroller is common and external
The earthing pole GND of power supply is connected, the intermediate connection terminal A of the resistor voltage divider circuit and the I/O detection terminal of the single-chip microcontroller
It is connected.
2. the microcontroller power supply low-voltage detection circuit of no A D interface according to claim 1 and internal reference voltage,
It is characterized in that: being equipped with an electricity between the intermediate connection terminal A of the resistor voltage divider circuit (2) and the positive VCC of external power supply
Resistance.
3. the microcontroller power supply low-voltage detection circuit of no A D interface according to claim 1 and internal reference voltage,
Be characterized in that: set between the intermediate connection terminal A of the resistor voltage divider circuit (2) and the positive VCC of external power supply there are two or
The resistance of more than two arranged in series.
4. the microcontroller power supply low-voltage detection circuit of no A D interface according to claim 1 and internal reference voltage,
It is characterized in that: being equipped with one between the intermediate connection terminal A of the resistor voltage divider circuit (2) and the earthing pole GND of external power supply
Resistance.
5. the microcontroller power supply low-voltage detection circuit of no A D interface according to claim 1 and internal reference voltage,
It is characterized in that: there are two being set between the intermediate connection terminal A of the resistor voltage divider circuit (2) and the earthing pole GND of external power supply
Or the resistance of more than two arranged in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822124961.XU CN209486164U (en) | 2018-12-18 | 2018-12-18 | Microcontroller power supply low-voltage detection circuit without A D interface and internal reference voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822124961.XU CN209486164U (en) | 2018-12-18 | 2018-12-18 | Microcontroller power supply low-voltage detection circuit without A D interface and internal reference voltage |
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| Publication Number | Publication Date |
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| CN209486164U true CN209486164U (en) | 2019-10-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637984A (en) * | 2020-06-04 | 2020-09-08 | 歌尔光学科技有限公司 | LED lamp temperature detection circuit and LED light source device |
-
2018
- 2018-12-18 CN CN201822124961.XU patent/CN209486164U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111637984A (en) * | 2020-06-04 | 2020-09-08 | 歌尔光学科技有限公司 | LED lamp temperature detection circuit and LED light source device |
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