CN216524005U - Chip circuit of built-in resistance frequency converter - Google Patents
Chip circuit of built-in resistance frequency converter Download PDFInfo
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- CN216524005U CN216524005U CN202122680996.3U CN202122680996U CN216524005U CN 216524005 U CN216524005 U CN 216524005U CN 202122680996 U CN202122680996 U CN 202122680996U CN 216524005 U CN216524005 U CN 216524005U
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Abstract
The utility model discloses a chip circuit with a built-in resistance frequency converter, and relates to the technical field of integrated circuits. The device comprises an MCU; a VDD end of the MCU is connected with a capacitor in series to be grounded; the GND end of the MCU is grounded; the VLDO end of the MCU is connected with a 0.1F capacitor in series to be grounded; the RFCO _2 end of the MCU is connected with a resistor R1 to the RFCO _ O end in series; two ends of the resistor R1 are connected in parallel with a resistor RH; the RFCO _1 end of the MCU is connected with a resistor RT to an RFCO _ O end in series; a resistor R2 is connected in parallel at two ends of the resistor RT; the RFCO _ I end of the MCU is connected with a resistor R3 to the RFCO _ O end in series; the middle connection point of the RFCO _ I end of the MCU and the resistor R3 is connected with a grounding capacitor. The resistance value to be measured is obtained by using the MCU with the built-in resistance frequency converter, and an external resistance frequency conversion chip is not needed, so that the circuit structure is simplified, the cost is low, and the method is suitable for mass production; the production cost and the maintenance cost in the later period are greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of integrated circuits, and particularly relates to a chip circuit with a built-in resistance frequency converter.
Background
In some applications of a single chip microcomputer, it is often necessary to measure values or changes of some physical quantities, such as temperature, pressure, etc. The detection of such a physical quantity is usually achieved by the application of a sensor. The sensor converts the simulation quantity of the physical quantity to be measured, such as temperature, pressure and the like, into the analog quantity of another type of physical quantity, such as a resistance value, and then converts the analog quantity into digital quantity data which can be processed by the singlechip through other methods. In practical application, the later production and maintenance cost is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a chip circuit with a built-in resistance frequency converter, which obtains a measured resistance value by using an MCU of the built-in resistance frequency converter, does not need to be externally connected with a resistance frequency conversion chip, simplifies the circuit structure, has low cost and is suitable for mass production; the production cost and the maintenance cost in the later period are greatly reduced.
In order to solve the technical problems, the utility model is realized by the following technical scheme:
the utility model relates to a chip circuit with a built-in resistance frequency converter, which comprises an MCU (microprogrammed control unit); a VDD end of the MCU is connected with a capacitor in series to be grounded; the GND end of the MCU is grounded; the VLDO end of the MCU is connected with a 0.1F capacitor in series to be grounded; the RFCO _2 end of the MCU is connected with a resistor R1 to an RFCO _ O end in series; two ends of the resistor R1 are connected in parallel with a resistor RH; the RFCO _1 end of the MCU is connected with a resistor RT to an RFCO _ O end in series; two ends of the resistor RT are connected with a resistor R2 in parallel; the RFCO _ I end of the MCU is connected with a resistor R3 to an RFCO _ O end in series; and the middle connection point of the RFCO _ I end of the MCU and the resistor R3 is connected with a grounding capacitor.
Further, the resistance values of the resistor R1 and the resistor R2 are both 1M omega.
Further, the resistance value of the resistor R3 is 51K omega.
The utility model has the following beneficial effects:
the resistance value to be measured is obtained by using the MCU with the built-in resistance frequency converter, and an external resistance frequency conversion chip is not needed, so that the circuit structure is simplified, the cost is low, and the method is suitable for mass production; the production cost and the maintenance cost in the later period are greatly reduced.
Of course, it is not necessary for any product in which the utility model is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a circuit diagram of a chip circuit of a built-in resistance frequency converter.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, the present invention is a chip circuit with a built-in resistance frequency converter, including an MCU; a VDD end of the MCU is connected with a capacitor in series to be grounded; the GND end of the MCU is grounded; the VLDO end of the MCU is connected with a 0.1F capacitor in series to be grounded; the RFCO _2 end of the MCU is connected with a resistor R1 to the RFCO _ O end in series; two ends of the resistor R1 are connected in parallel with a resistor RH; the RFCO _1 end of the MCU is connected with a resistor RT to an RFCO _ O end in series; a resistor R2 is connected in parallel at two ends of the resistor RT; the RFCO _ I end of the MCU is connected with a resistor R3 to the RFCO _ O end in series; the middle connection point of the RFCO _ I end of the MCU and the resistor R3 is connected with a grounding capacitor; the resistance of the resistor R1 and the resistance of the resistor R2 are both 1M omega, and the resistance of the resistor R3 is 51K omega.
The three RFC channels comprise one channel used for being connected with a standard resistor as a reference loop, and the other two ports can be respectively connected with two different measuring loops. RFCOUT outputs to a gating end of TC2 to perform pulse width calculation, or outputs to an external clock input end of TC2 to perform frequency calculation; by measuring the pulse width of each sensor and the reference resistance value, the resistance of each sensor can be calculated.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the utility model disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the utility model to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model. The utility model is limited only by the claims and their full scope and equivalents.
Claims (3)
1. A chip circuit with a built-in resistance frequency converter is characterized by comprising an MCU; a VDD end of the MCU is connected with a capacitor in series to be grounded;
the GND end of the MCU is grounded;
the VLDO end of the MCU is connected with a 0.1F capacitor in series to be grounded;
the RFCO _2 end of the MCU is connected with a resistor R1 to an RFCO _ O end in series; two ends of the resistor R1 are connected in parallel with a resistor RH;
the RFCO _1 end of the MCU is connected with a resistor RT to an RFCO _ O end in series; two ends of the resistor RT are connected with a resistor R2 in parallel;
the RFCO _ I end of the MCU is connected with a resistor R3 to an RFCO _ O end in series; and the middle connection point of the RFCO _ I end of the MCU and the resistor R3 is connected with a grounding capacitor.
2. The chip circuit of claim 1, wherein the resistance values of the resistor R1 and the resistor R2 are 1M Ω.
3. The chip circuit of claim 1, wherein the resistance R3 is 51K Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122680996.3U CN216524005U (en) | 2021-11-04 | 2021-11-04 | Chip circuit of built-in resistance frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122680996.3U CN216524005U (en) | 2021-11-04 | 2021-11-04 | Chip circuit of built-in resistance frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216524005U true CN216524005U (en) | 2022-05-13 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122680996.3U Active CN216524005U (en) | 2021-11-04 | 2021-11-04 | Chip circuit of built-in resistance frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216524005U (en) |
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2021
- 2021-11-04 CN CN202122680996.3U patent/CN216524005U/en active Active
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