CN216387201U - LSE static operating point voltage detection circuit, MCU voltage detection circuit and MCU automation equipment - Google Patents
LSE static operating point voltage detection circuit, MCU voltage detection circuit and MCU automation equipment Download PDFInfo
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- CN216387201U CN216387201U CN202122557953.6U CN202122557953U CN216387201U CN 216387201 U CN216387201 U CN 216387201U CN 202122557953 U CN202122557953 U CN 202122557953U CN 216387201 U CN216387201 U CN 216387201U
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Abstract
The application provides a static operating point voltage detection circuitry of LSE, MCU's voltage detection circuitry and MCU automation equipment, this static operating point voltage detection circuitry of LSE includes: the LSE static operating point voltage output unit and the voltage following unit; the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value; and the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit so as to measure the target voltage through the measuring unit. The voltage measuring device can obtain a voltage with higher accuracy through measurement of an oscilloscope or a multimeter.
Description
Technical Field
The application relates to the technical field of electronics, especially, relate to a LSE static operating point voltage detection circuit, MCU's voltage detection circuit and MCU automation equipment.
Background
At present, an oscilloscope or a multimeter is generally used to measure the voltage at the corresponding port of the electronic device.
For the case of a small voltage, for example, the static operating point voltage of a Low Speed external clock (LSE) circuit of a Micro Control Unit (MCU), the accuracy of the voltage measured by an oscilloscope or a multimeter is not high.
SUMMERY OF THE UTILITY MODEL
The application provides a static operating point voltage detection circuit of LSE, MCU's voltage detection circuit and MCU automation equipment to the solution is to the less condition of voltage, the not high problem of voltage accuracy that obtains through oscilloscope or universal meter measurement.
In a first aspect, the present application provides an LSE quiescent operating point voltage detection circuit, including: the LSE static operating point voltage output unit and the voltage following unit;
the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit;
the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value;
and the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit so as to measure the target voltage through the measuring unit.
Optionally, the voltage following unit is an operational amplifier voltage following unit, the operational amplifier voltage following unit includes an operational amplifier unit, a non-inverting input terminal of the operational amplifier unit is connected to an output terminal of the LSE static operating point voltage output unit, an inverting input terminal of the operational amplifier unit is connected to an output terminal of the operational amplifier unit, and an output terminal of the operational amplifier unit is connected to the measurement unit.
Optionally, the voltage following unit is a transistor voltage following unit, the transistor voltage following unit includes a transistor, a base of the transistor is connected with an output end of the LSE quiescent operating point voltage output unit, a collector of the transistor is connected with a power supply, and an emitter of the transistor is connected with the measuring unit.
In a second aspect, the present application provides a voltage detection circuit of an MCU, comprising: the device comprises an MCU, a voltage following unit and a measuring unit;
the voltage output end of the LSE static operating point on the MCU is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit;
the MCU is used for receiving a clock signal output by the LSE crystal oscillator and outputting a static working point voltage through an LSE static working point voltage output end;
the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit, wherein the static working point voltage is smaller than or equal to a voltage threshold value;
and the measuring unit is used for measuring the target voltage.
Optionally, the voltage following unit is an operational amplifier voltage following unit, the operational amplifier voltage following unit includes an operational amplifier unit, a non-inverting input terminal of the operational amplifier unit is connected to the voltage output terminal of the LSE static operating point, an inverting input terminal of the operational amplifier unit is connected to the output terminal of the operational amplifier unit, and an output terminal of the operational amplifier unit is connected to the measurement unit.
Optionally, the voltage following unit is a transistor voltage following unit, the transistor voltage following unit includes a transistor, a base of the transistor is connected with the voltage output end of the LSE quiescent operating point, a collector of the transistor is connected with the power supply, and an emitter of the transistor is connected with the measuring unit.
In a third aspect, the present application provides an MCU automation device, comprising:
a detection module comprising: the LSE static operating point voltage output unit and the voltage following unit; the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value; the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit;
a measurement module comprising: and the measuring unit is used for measuring the target voltage.
Optionally, the voltage following unit is an operational amplifier voltage following unit, the operational amplifier voltage following unit includes an operational amplifier unit, a non-inverting input terminal of the operational amplifier unit is connected to an output terminal of the LSE static operating point voltage output unit, an inverting input terminal of the operational amplifier unit is connected to an output terminal of the operational amplifier unit, and an output terminal of the operational amplifier unit is connected to the measurement unit.
Optionally, the voltage following unit is a transistor voltage following unit, the transistor voltage following unit includes a transistor, a base of the transistor is connected with an output end of the LSE quiescent operating point voltage output unit, a collector of the transistor is connected with a power supply, and an emitter of the transistor is connected with the measuring unit.
Optionally, the measurement unit comprises a multimeter and/or an oscilloscope.
The LSE static working point voltage detection circuit comprises an LSE static working point voltage output unit and a voltage following unit; the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value; and the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit so as to measure the target voltage through the measuring unit. Because this application has set up voltage following unit between LSE static operating point voltage output unit's output and measuring element, buffers the isolation through voltage following unit to static operating point voltage, consequently, can obtain the voltage that the accuracy is higher through oscilloscope or universal meter measurement for example.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1(a) is a schematic diagram of a voltage follower according to an embodiment of the present application;
FIG. 1(b) is a schematic diagram of a voltage follower according to another embodiment of the present application;
fig. 2 is a schematic diagram of an LSE quiescent point voltage detection circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of an LSE quiescent operating point voltage detection circuit according to another embodiment of the present application;
fig. 4 is a schematic structural diagram of an operational amplifier according to an embodiment of the present disclosure;
fig. 5 is a schematic diagram of an LSE quiescent operating point voltage detection circuit according to yet another embodiment of the present application;
fig. 6 is a schematic diagram of a voltage detection circuit of an MCU according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a voltage detection circuit of an MCU according to another embodiment of the present application;
fig. 8 is a schematic diagram of an MCU automation device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
First, some technical terms related to the present application are explained:
voltage followers are a class of electronic components that achieve a change in output voltage with input voltage. I.e. the voltage amplification of the voltage follower is constantly less than and close to 1. FIG. 1(a) is a schematic diagram of a voltage follower according to an embodiment of the present application, and as shown in FIG. 1(a), the voltage follower is mainly composed of an operational amplifier A1 and a resistor R2, and an input voltage ui1Is input to the voltage follower through a resistor R1, and then the voltage u is output by the voltage followero1To the back-end circuitry. FIG. 1(b) is a schematic diagram of a voltage follower according to another embodiment of the present application, as shown in FIG. 1(b), the voltage follower is mainly composed of an operational amplifier A2, and an input voltage ui2Output of a voltage u by means of a voltage followero2To the back-end circuitry. The voltage follower has the remarkable characteristics of high input impedance and low output impedance. Typically, for example, the input impedance may reach several mega ohms, while the output impedance is low, typically only a few ohms, or even lower. The voltage follower plays the effect of buffering, isolation, improvement area loading ability: (1) the common-integrated circuit of the voltage follower has the characteristics of high input impedance and low output impedance, so that the common-integrated circuit can play a role of impedance matching in the circuitThe amplifier circuit of the next stage can work better. For example, when the signal output of an electric guitar is high impedance, and a recording device or a sound box is connected, a voltage follower is added before a tone color processing circuit, so that impedance matching is achieved, tone color is more perfect, and the voltage follower is used in the input part design of many electric guitar effectors. (2) The output voltage of the voltage follower is similar to the input voltage amplitude, and the voltage follower is in a high-resistance state for a front-stage circuit and a low-resistance state for a rear-stage circuit, so that the voltage follower plays an isolating role for the front-stage circuit and the rear-stage circuit. (3) The voltage follower is often used as an intermediate stage to "isolate" the influence between the front and rear stages, which is called a buffer stage, and the basic principle still utilizes the characteristics of high input impedance and low output impedance of the voltage follower. (4) The voltage follower has the characteristics of high input impedance and low output impedance, so that extreme understanding can be realized, and when the input impedance is very high, the voltage follower is equivalent to an open circuit of a preceding stage circuit; when the output impedance is very low, the circuit acts as a constant voltage source for the subsequent circuit, i.e. the output voltage is not affected by the impedance of the subsequent circuit. A circuit which is equivalent to an open circuit for a front-stage circuit and has output voltage not influenced by rear-stage impedance certainly has an isolation function, so that the front-stage circuit and the rear-stage circuit are not influenced by each other.
At present, an oscilloscope or a multimeter is generally used to measure the voltage at the corresponding port of the electronic device. For some special signals, such as the static operating point voltage of the low-speed external clock circuit of the MCU, since the voltage is small and the load capacity is weak, if the special signals are directly connected to an oscilloscope or a multimeter, the accuracy of the voltage obtained by measurement is not high, i.e., the actual static operating point voltage of the low-speed external clock circuit cannot be determined.
Based on above-mentioned problem, this application provides a static operating point voltage detection circuit of LSE, MCU's voltage detection circuit and MCU automation equipment, through using the voltage follower, utilizes the characteristic of voltage follower, to the less condition of voltage, can obtain the higher voltage of accuracy through oscilloscope or universal meter measurement.
Fig. 2 is a schematic diagram of an LSE quiescent operating point voltage detection circuit according to an embodiment of the present application. As shown in fig. 2, the LSE quiescent operating point voltage detection circuit 200 according to the embodiment of the present application includes: an LSE quiescent operating point voltage output unit 210 and a voltage follower unit 220. The output end of the LSE quiescent operating point voltage output unit 210 is connected to the input end of the voltage follower unit 220, and the output end of the voltage follower unit 220 is used for being connected to the measurement unit.
The LSE quiescent operating point voltage output unit 210 is configured to output a quiescent operating point voltage, where the quiescent operating point voltage is less than or equal to a voltage threshold.
And a voltage following unit 220 for outputting a target voltage to the measuring unit in response to receiving the static operating point voltage to measure the target voltage by the measuring unit.
In the embodiment of the present application, the voltage threshold is used to determine whether the voltage is relatively small, and the voltage threshold may be set to a voltage value greater than 0 volt and less than 1 volt, for example. And an LSE quiescent operating point voltage output unit 210 for outputting a quiescent operating point voltage less than or equal to the voltage threshold. Illustratively, the voltage threshold is, for example, 0.5 v, and the static operating point voltage output by the LSE static operating point voltage output unit 210 is, for example, 0.1 v, then the static operating point voltage 0.1 v is less than the voltage threshold 0.5 v.
The voltage follower unit 220, i.e. the voltage follower mentioned above, has the characteristics of high input impedance and low output impedance, and can play the roles of buffering, isolating and improving the carrying capacity. Illustratively, the voltage follower unit 220 is, for example, a voltage follower shown in fig. 1(a), or a voltage follower shown in fig. 1 (b).
The measuring unit is, for example, a multimeter or an oscilloscope. The measurement unit may measure the voltage output by the voltage following unit 220.
The measuring unit is, for example, a multimeter. The LSE static operating point voltage output unit 210 outputs a static operating point voltage, and the voltage follower outputs a corresponding target voltage to the multimeter in response to receiving the static operating point voltage, so as to measure the target voltage by the multimeter.
Illustratively, the measurement unit is, for example, an oscilloscope, the LSE static operating point voltage output unit 210 outputs a static operating point voltage, and the voltage follower outputs a corresponding target voltage to the oscilloscope in response to receiving the static operating point voltage, so as to measure the target voltage through the oscilloscope.
The LSE static operating point voltage detection circuit provided by the embodiment of the application comprises an LSE static operating point voltage output unit and a voltage following unit; the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value; and the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit so as to measure the target voltage through the measuring unit. Because this application has set up voltage following unit between LSE static operating point voltage output unit's output and measuring element, buffers the isolation through voltage following unit to static operating point voltage, consequently, can obtain the voltage that the accuracy is higher through oscilloscope or universal meter measurement for example.
Based on the foregoing embodiments, fig. 3 is a schematic diagram of an LSE quiescent operating point voltage detection circuit according to another embodiment of the present application. As shown in fig. 3, the LSE quiescent operating point voltage detection circuit 200 according to the embodiment of the present application includes: an LSE quiescent operating point voltage output unit 210 and a voltage follower unit 220. The voltage following unit 220 is an operational amplifier voltage following unit, which includes an operational amplifier unit 221, a non-inverting input end 2211 of the operational amplifier unit is connected to an output end of the LSE static operating point voltage output unit 210, an inverting input end 2212 of the operational amplifier unit 221 is connected to an output end 2213 of the operational amplifier unit 221, and an output end 2213 of the operational amplifier unit 221 is connected to the measurement unit.
Illustratively, the operational amplification unit 221, i.e., an operational amplifier, includes a non-inverting input terminal 2211, an inverting input terminal 2212, and an output terminal 2213. The operational amplifier is, for example, a CA3130 operational amplifier, which is not limited in this application. Fig. 4 is a schematic structural diagram of an operational amplifier according to an embodiment of the present application, and as shown in fig. 4, the operational amplifier includes 8 referencesPin, wherein pin 3 is the non-inverting input terminal of the operational amplifier, and pin 3 is connected with the input voltage VinThe input voltage VinA static operating point voltage output by the LSE static operating point voltage output unit 210; pin 2 is the inverting input terminal of the operational amplifier and is connected with pin 6; the 6 pin is the output end of the operational amplifier and is connected with the measuring unit, and the 6 pin outputs voltage V to the measuring unitoutI.e., a target voltage, to be measured by the measuring unit; a capacitor is connected between the pin 1 and the pin 8, and the capacitor is 47 picofarads (pF) for example and plays a role of filtering; the 4 pin is grounded; pin 7 is connected to a supply voltage, such as 9V; pins 1 and 5 are zero-setting pins.
Illustratively, the operational amplification unit 221 outputs the target voltage to the measurement unit in response to receiving the static operating point voltage output by the LSE static operating point voltage output unit 210 to measure the target voltage by the measurement unit. Based on the characteristics of the voltage follower that the input impedance is high and the output impedance is low, the non-inverting input end 2211 of the operational amplification unit 221 is connected with the output end of the LSE static operating point voltage output unit 210, so as to play a role of buffering; the inverting input end 2212 of the operational amplification unit 221 is connected with the output end 2213 of the operational amplification unit 221 to form a negative feedback circuit, so that the interference of the reaction potential on the input voltage can be cut off, the isolation effect of the voltage follower is realized, and then the target voltage which is very similar to the static working point voltage, has excellent load capacity and has buffering and isolation effects can be obtained, namely the static working point voltage of the low-speed external clock circuit can be really measured. Illustratively, after the voltage following unit 220 is added between the output end of the LSE quiescent operating point voltage output unit 210 and the measurement unit, the quiescent operating point voltage output by the LSE quiescent operating point voltage output unit 210 obtained by the measurement unit has an error range of 50 to 100mV compared with the voltage following unit 220 is not added, that is, after the voltage following unit 220 is added between the output end of the LSE quiescent operating point voltage output unit 210 and the measurement unit, the accuracy of the quiescent operating point voltage obtained by the measurement unit is higher.
On the basis of the foregoing embodiment, fig. 5 is a schematic diagram of an LSE static operating point voltage detection circuit according to another embodiment of the present application. As shown in fig. 5, the LSE quiescent operating point voltage detection circuit 200 according to the embodiment of the present application includes: an LSE quiescent operating point voltage output unit 210 and a voltage follower unit 220. The voltage following unit 220 is a transistor voltage following unit, the transistor voltage following unit includes a transistor 222, a base 2221 of the transistor 222 is connected to the output end of the LSE quiescent operating point voltage output unit 210, a collector 2222 of the transistor 222 is connected to the power supply, and an emitter 2223 of the transistor 222 is connected to the measurement unit.
Illustratively, transistor 222 includes a base 2221, a collector 2222, and an emitter 2223. The transistor 222 outputs a target voltage to the measurement unit in response to receiving the static operating point voltage output by the LSE static operating point voltage output unit 210 to measure the target voltage by the measurement unit. By the mode, the target voltage which is very similar to the static working point voltage, has excellent load capacity and has buffering and isolating functions can be obtained.
Illustratively, the voltage follower unit 220 may be integrated into a chip to form a voltage follower chip for convenient testing.
Fig. 6 is a schematic diagram of a voltage detection circuit of an MCU according to an embodiment of the present application. As shown in fig. 6, the voltage detection circuit 600 of the MCU in the embodiment of the present application includes: MCU601, voltage following unit 220, and measurement unit 602. Wherein, an LSE quiescent operating point voltage output terminal (not shown in fig. 6) on the MCU is connected to an input terminal of the voltage follower unit 220, and an output terminal of the voltage follower unit 220 is used for connecting to the measurement unit 602.
The MCU601 is used for receiving a clock signal output by the LSE crystal oscillator and outputting a static operating point voltage through an LSE static operating point voltage output end.
The voltage following unit 220 is configured to output a target voltage to the measurement unit 602 in response to receiving a static operating point voltage, where the static operating point voltage is less than or equal to a voltage threshold.
A measurement unit 602 for measuring a target voltage.
Illustratively, the measurement unit 602 is, for example, a multimeter, and the voltage follower unit 220 is, for example, the voltage follower described above. The MCU601 outputs a static operating point voltage through an LSE static operating point voltage output end; the voltage follower responds to the received static working point voltage and outputs a corresponding target voltage to the multimeter; the multimeter measures the target voltage.
In some embodiments, the voltage follower unit 220 is an operational amplifier voltage follower unit, the operational amplifier voltage follower unit includes an operational amplifier unit, a non-inverting input terminal of the operational amplifier unit is connected to an LSE quiescent point voltage output terminal of the MCU, an inverting input terminal of the operational amplifier unit is connected to an output terminal of the operational amplifier unit, and an output terminal of the operational amplifier unit is connected to the measurement unit 602.
Optionally, the voltage following unit 220 is a transistor voltage following unit, the transistor voltage following unit includes a transistor, a base of the transistor is connected to the LSE quiescent operating point voltage output terminal on the MCU, a collector of the transistor is connected to the power supply, and an emitter of the transistor is connected to the measurement unit 602.
The voltage detection circuit of the MCU provided by the embodiment of the application comprises the MCU, a voltage following unit and a measuring unit; the voltage output end of the LSE static operating point on the MCU is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the MCU is used for receiving a clock signal output by the LSE crystal oscillator and outputting a static working point voltage through an LSE static working point voltage output end; the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit so as to measure the target voltage through the measuring unit; and the measuring unit is used for measuring the target voltage. Because the voltage follower is arranged between the voltage output end of the LSE static working point on the MCU and the measuring unit, the output voltage is buffered and isolated through the voltage follower, and therefore, the voltage with higher accuracy can be obtained through measurement of an oscilloscope or a multimeter.
Exemplarily, fig. 7 is a schematic diagram of a voltage detection circuit of an MCU provided in another embodiment of the present application. As shown in FIG. 7, the voltage detection circuit 700 of the MCU includes an LSE quiescent operating point voltage output terminal 701 on the MCU, a voltage follower unit 220, and a multimeter 702. Wherein:
and an LSE static operating point voltage output end 701 on the MCU is connected with an input end of the voltage following unit 220, and an output end of the voltage following unit 220 is used for being connected with a multimeter 702.
The LSE quiescent operating point voltage output terminal 701 on the MCU outputs the quiescent operating point voltage.
The voltage following unit 220 is an operational amplifier voltage following unit, the operational amplifier voltage following unit includes an operational amplifier unit 221, a non-inverting input end 2211 of the operational amplifier unit 221 is connected with the LSE static operating point voltage output end 701 on the MCU, an inverting input end 2212 of the operational amplifier unit 221 is connected with an output end 2213 of the operational amplifier unit 221, and an output end 2213 of the operational amplifier unit 221 is connected with the multimeter 702. The operational amplifier voltage following unit outputs a target voltage to multimeter 702 in response to receiving a quiescent operating point voltage, the quiescent operating point voltage being less than or equal to a voltage threshold.
Fig. 8 is a schematic diagram of an MCU automation device according to an embodiment of the present application. As shown in fig. 8, the MCU automation apparatus 800 of the present embodiment includes: a detection module 801 and a measurement module 802. Wherein:
the detection module 801 comprises an LSE static operating point voltage output unit and a voltage following unit; the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value; and the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit.
The measurement module 802 includes a measurement unit for measuring a target voltage.
Optionally, the voltage following unit is an operational amplifier voltage following unit, the operational amplifier voltage following unit includes an operational amplifier unit, a non-inverting input terminal of the operational amplifier unit is connected to an output terminal of the LSE static operating point voltage output unit, an inverting input terminal of the operational amplifier unit is connected to an output terminal of the operational amplifier unit, and an output terminal of the operational amplifier unit is connected to the measurement unit.
Optionally, the voltage following unit is a transistor voltage following unit, the transistor voltage following unit includes a transistor, a base of the transistor is connected with an output end of the LSE quiescent operating point voltage output unit, a collector of the transistor is connected with a power supply, and an emitter of the transistor is connected with the measuring unit.
In some embodiments, the measurement unit comprises a multimeter and/or an oscilloscope.
Illustratively, the measuring unit is a multimeter, such as a six-bit half multimeter, and is connected with the output end of the voltage following unit, so that the target voltage output by the voltage following unit can be measured. It should be noted that, a multimeter with corresponding accuracy can be selected and used as required, and the application is not limited thereto.
Illustratively, the measuring unit is, for example, an oscilloscope, which is connected to the output terminal of the voltage follower unit and can measure the target voltage output by the voltage follower unit. The voltage detection is carried out by using the oscilloscope, and compared with the voltage detection by using a universal meter, the detection voltage can be obtained more accurately.
The MCU automation equipment provided by the embodiment of the application comprises a detection module and a measurement module, wherein the detection module comprises an LSE static working point voltage output unit and a voltage following unit; the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value; the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit; the measuring module comprises a measuring unit for measuring a target voltage. Because the voltage follower is arranged between the output end of the voltage output unit of the LSE static working point and the measuring unit, and the output voltage is buffered and isolated through the voltage follower, the voltage with higher accuracy can be obtained through the measurement of the measuring unit such as an oscilloscope or a multimeter under the condition of smaller voltage.
It is to be understood that the various numerical references referred to in the embodiments of the present application are merely for descriptive convenience and are not intended to limit the scope of the embodiments of the present application. In the embodiment of the present application, the sequence numbers of the above-mentioned processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiment of the present application.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (10)
1. An LSE quiescent point voltage detection circuit, comprising: the LSE static operating point voltage output unit and the voltage following unit;
the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit;
the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value;
the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit so as to measure the target voltage through the measuring unit.
2. The LSE quiescent operating point voltage detection circuit of claim 1, wherein said voltage follower unit is an operational amplifier voltage follower unit, said operational amplifier voltage follower unit comprising an operational amplifier unit having a non-inverting input connected to an output of said LSE quiescent operating point voltage output unit, an inverting input connected to an output of said operational amplifier unit, and an output connected to said measurement unit.
3. The LSE quiescent operating point voltage detection circuit of claim 1, wherein the voltage follower unit is a transistor voltage follower unit comprising a transistor having a base connected to the output of the LSE quiescent operating point voltage output unit, a collector connected to a power supply, and an emitter connected to the measurement unit.
4. A voltage detection circuit of an MCU, comprising: the device comprises an MCU, a voltage following unit and a measuring unit;
the voltage output end of the LSE static operating point on the MCU is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit;
the MCU is used for receiving a clock signal output by the LSE crystal oscillator and outputting a static working point voltage through the LSE static working point voltage output end;
the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit, wherein the static working point voltage is smaller than or equal to a voltage threshold value;
the measuring unit is used for measuring the target voltage.
5. The MCU voltage detection circuit according to claim 4, wherein the voltage follower unit is an operational amplifier voltage follower unit, the operational amplifier voltage follower unit comprises an operational amplifier unit, a non-inverting input terminal of the operational amplifier unit is connected to an LSE quiescent operating point voltage output terminal of the MCU, an inverting input terminal of the operational amplifier unit is connected to an output terminal of the operational amplifier unit, and an output terminal of the operational amplifier unit is connected to the measurement unit.
6. The MCU voltage detection circuit according to claim 4, wherein the voltage follower unit is a transistor voltage follower unit comprising a transistor, the base of the transistor is connected to the LSE quiescent operating point voltage output terminal on the MCU, the collector of the transistor is connected to a power supply, and the emitter of the transistor is connected to the measurement unit.
7. An MCU automation device, comprising:
a detection module comprising: the LSE static operating point voltage output unit and the voltage following unit; the output end of the LSE static operating point voltage output unit is connected with the input end of the voltage following unit, and the output end of the voltage following unit is used for being connected with the measuring unit; the LSE static operating point voltage output unit is used for outputting a static operating point voltage, and the static operating point voltage is less than or equal to a voltage threshold value; the voltage following unit is used for responding to the received static working point voltage and outputting a target voltage to the measuring unit;
a measurement module comprising: the measurement unit is used for measuring the target voltage.
8. The MCU automation device according to claim 7, wherein the voltage follower unit is an operational amplifier voltage follower unit, the operational amplifier voltage follower unit comprises an operational amplifier unit, a non-inverting input terminal of the operational amplifier unit is connected to an output terminal of the LSE quiescent operating point voltage output unit, an inverting input terminal of the operational amplifier unit is connected to an output terminal of the operational amplifier unit, and an output terminal of the operational amplifier unit is connected to the measurement unit.
9. The MCU automation device of claim 7, wherein the voltage follower unit is a transistor voltage follower unit comprising a transistor having a base connected to the output of the LSE quiescent operating point voltage output unit, a collector connected to a power supply, and an emitter connected to the measurement unit.
10. An MCU automation device as defined in any of claims 7 to 9, wherein the measurement unit comprises a multimeter and/or an oscilloscope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202122557953.6U CN216387201U (en) | 2021-10-22 | 2021-10-22 | LSE static operating point voltage detection circuit, MCU voltage detection circuit and MCU automation equipment |
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| CN202122557953.6U CN216387201U (en) | 2021-10-22 | 2021-10-22 | LSE static operating point voltage detection circuit, MCU voltage detection circuit and MCU automation equipment |
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