CN109709863B - AD port self-checking circuit of singlechip, singlechip and water heater - Google Patents
AD port self-checking circuit of singlechip, singlechip and water heater Download PDFInfo
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- CN109709863B CN109709863B CN201910009655.8A CN201910009655A CN109709863B CN 109709863 B CN109709863 B CN 109709863B CN 201910009655 A CN201910009655 A CN 201910009655A CN 109709863 B CN109709863 B CN 109709863B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 12
- 238000001514 detection method Methods 0.000 claims abstract description 81
- 238000012360 testing method Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 11
- 238000005070 sampling Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 101100215777 Schizosaccharomyces pombe (strain 972 / ATCC 24843) ain1 gene Proteins 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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Abstract
The invention is suitable for the technical field of single-chip microcomputer, provides an AD port self-checking circuit of the single-chip microcomputer, the single-chip microcomputer and a water heater, and aims to solve the problem of how to realize a self-checking function of an AD converter and an AD channel switcher of the single-chip microcomputer. An AD port self-checking circuit of a singlechip, comprising: an AD converter detection sub-circuit connected between the detection port and the first control port; and the AD channel switcher detection sub-circuit is connected between any AD port to be detected and the second control port. The invention provides a level between the low level and the high level for the detection port through the low level, the high level and the reference voltage output by the first control port on the singlechip, tests whether the analog-to-digital conversion of the AD converter is normal, and realizes the self-detection of the converter of the singlechip; and outputting low level and high level through the second control port to detect whether the AD channel of the singlechip is switched to the AD port or not, so as to realize self-checking of the AD channel switcher.
Description
Technical Field
The invention belongs to the technical field of single-chip microcomputer, and particularly relates to an AD port self-checking circuit of a single-chip microcomputer, the single-chip microcomputer and a water heater.
Background
AD conversion (Analog-to-Digital conversion) is Analog-to-Digital conversion. As the name implies, the analog signal is converted into a digital signal, which mainly includes an integral type, a successive approximation type, a parallel comparison type/serial-parallel type, a sigma-delta modulation type, a capacitor array successive comparison type and a voltage-frequency conversion type. The AD converter is used to convert an analog quantity into a digital quantity through a certain circuit. The analog quantity may be an electrical signal such as voltage or current, or may be a non-electrical signal such as pressure, temperature, humidity, displacement, sound, etc. However, before AD conversion, the input signal to the AD converter must be converted into a voltage signal by various sensors.
The singlechip (Microcontroller Unit, MCU) in the prior art has an AD function, but does not have the self-checking function of an AD converter and an AD channel switcher, the self-checking function of the AD converter and the AD channel switcher usually depends on peripheral circuits or equipment to realize detection, so that the whole circuit is complex, the cost is high, and the requirement of AD self-checking cannot be met because the circuits or equipment for realizing detection are peripheral.
Disclosure of Invention
The invention provides an AD port self-checking circuit of a singlechip, which aims to solve the problem of how to realize a self-checking function of an AD converter and an AD channel switcher of the singlechip.
The invention is realized in such a way, an AD port self-checking circuit of a singlechip is provided with an AD port and a control port, the AD port comprises a detection port and a plurality of AD ports to be detected, and the control port comprises a first control port and a second control port, and the AD port self-checking circuit is characterized in that the AD port self-checking circuit comprises:
an AD converter detection sub-circuit connected between the detection port and the first control port;
and the AD channel switcher detection sub-circuit is connected between any AD port to be detected and the second control port.
Furthermore, the AD port self-checking circuit also comprises a voltage stabilizing sub-circuit connected between the singlechip power supply and the ground.
Further, the voltage stabilizing sub-circuit comprises a first capacitor, one end of the first capacitor is connected with the power supply of the single chip microcomputer, and the other end of the first capacitor is grounded.
Still further, the AD converter detection sub-circuit includes:
a current limiting module for providing a third level signal between a high level and a low level;
and the filtering module is used for stabilizing the level signal.
Still further, the current limiting module includes:
one end of the first resistor is connected with a singlechip power supply;
the negative electrode is connected with the other end of the first resistor, and the positive electrode is grounded;
one end of the filter module is connected to a connecting line between the first resistor and the voltage stabilizing diode, and the other end of the filter module is connected to the second resistor of the filter module.
Still further, the filtering module includes:
the third resistor is connected between the port to be detected and the first control port;
one end of the first capacitor is connected to the connecting line between the port to be detected and the third resistor, and the other end of the first capacitor is grounded.
Further, the AD channel switch detection sub-circuit includes a fourth resistor connected in series between any of the AD ports to be detected and the second control port.
Still further, the detection subcircuit of the AD channel switcher further comprises a first diode, wherein the negative electrode of the first diode is connected with a singlechip power supply, and the positive electrode of the first diode is connected with a connecting line between the fourth resistor and the second control port.
The invention also provides a singlechip, which comprises the AD port self-checking circuit.
The invention also provides a water heater, which comprises the AD port self-checking circuit.
In the AD port self-checking circuit of the singlechip, the AD converter detection sub-circuit and the AD channel switcher detection sub-circuit are respectively connected between the detection port and the first control port and between any AD port to be detected and the second control port, so that the self-checking of the AD converter and the self-checking of the AD channel switcher are realized. The method comprises the steps of providing a level between a low level and a high level for a detection port through the low level, the high level and a reference voltage output by a first control port on the singlechip, testing whether analog-to-digital conversion of an AD converter is normal, and realizing self-detection of the converter of the singlechip; and outputting low level and high level through the second control port to detect whether the AD channel of the singlechip is switched to the AD port or not, so as to realize self-checking of the AD channel switcher.
Drawings
Fig. 1 is a block diagram of an AD port self-checking circuit of a single chip microcomputer according to an embodiment of the present invention;
fig. 2 is an AD port self-checking circuit diagram of a single chip microcomputer according to the second to eighth embodiments of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, which comprises the following components: an AD converter detection sub-circuit connected between the detection port and the first control port, and an AD channel switch detection sub-circuit connected between any one of the AD ports to be detected and the second control port. The AD converter detection sub-circuit provides a level between the low level and the high level for the detection port through the low level, the high level and the reference voltage output by the first control port on the singlechip, tests whether the analog-to-digital conversion of the AD converter of the singlechip is normal, and realizes the self-detection of the AD converter; in the detection sub-circuit of the AD channel switcher, whether the AD channel of the singlechip is switched to the AD port or not is detected by outputting low level and high level through the second control port, so that the self-detection of the AD channel switcher is realized.
Example 1
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, as shown in fig. 1, an AD port and a control port are arranged on the singlechip 100, the AD port comprises a detection port and a plurality of AD ports to be detected, the control port comprises a first control port and a second control port, and the AD port self-checking circuit comprises:
an AD converter detection sub-circuit 200 connected between the detection port and the first control port;
an AD channel switch detection subcircuit 300 connected between any one of the AD ports to be detected and the second control port.
The working principle of the AD port self-checking circuit of the singlechip is as follows:
in the detection sub-circuit 200 of the AD converter, a low level, a high level and a reference voltage are output through a first control port on the single chip microcomputer 100, a level between the low level and the high level is provided for the detection port, and is used as a sampling level to test whether the analog-to-digital conversion of the AD converter of the single chip microcomputer 100 is normal or not, so that the self-detection of the AD converter of the single chip microcomputer 100 is realized; in the detection sub-circuit 300 of the AD channel switch, whether the AD channel of the single-chip microcomputer is switched to the AD port is detected by outputting low level and high level through the second control port, so that the self-detection of the AD channel switch of the single-chip microcomputer 100 is realized, and the requirement of the EN60730 standard AD self-detection can be met.
In this embodiment, the MCU has multiple AD ports, but only one AD converter, so an AD channel switch is required to switch the AD ports. To ensure normal switching, it is necessary to detect whether the AD channel switch is normal before collecting data. The AD converter detection sub-circuit 200 and the AD channel switch detection sub-circuit 300 are respectively connected between the detection port and the first control port, and between any one of the to-be-detected AD port and the second control port, so that self-detection of the AD converter and self-detection of the AD channel switch are realized.
In the AD port self-checking circuit of the singlechip, the AD converter detection sub-circuit and the AD channel switcher detection sub-circuit are respectively connected between the detection port and the first control port and between any AD port to be detected and the second control port, so that the self-checking of the AD converter and the self-checking of the AD channel switcher are realized. The method comprises the steps of providing a level between a low level and a high level for a detection port through the low level, the high level and a reference voltage output by a first control port on the singlechip, testing whether analog-to-digital conversion of an AD converter is normal, and realizing self-detection of the converter of the singlechip; and outputting low level and high level through the second control port to detect whether the AD channel of the singlechip is switched to the AD port or not, so as to realize self-checking of the AD channel switcher.
Example two
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, which is shown in fig. 2, and further comprises a voltage stabilizing sub-circuit 400 connected between a power supply and the ground of the singlechip 100 on the basis of the first embodiment.
In this embodiment, by setting the voltage stabilizing sub-circuit 400 between the power supply (+ 5V-AD) of the single-chip microcomputer 100 and the ground (GND-5V-AD), the short circuit of the single-chip microcomputer line power supply is avoided.
Example III
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, as shown in fig. 2, on the basis of the second embodiment, a voltage stabilizing sub-circuit 400 comprises a second capacitor C2, one end of which is connected with a power supply of the singlechip 100, and the other end of which is grounded.
In this embodiment, the voltage stabilizing sub-circuit 400 specifically adopts the second capacitor C2, so as to enable the power supply voltage of the singlechip 100 to change steadily, and provide a stable reference voltage for the singlechip 100.
Example IV
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, as shown in FIG. 2, on the basis of any one of the first to third embodiments, an AD converter detection sub-circuit 200 comprises:
a current limiting module 201 providing a third level signal between a high level and a low level;
a filtering module 202 for stabilizing the level signal.
In this embodiment, ain6/P29 (ADcheck-DetSelf) in fig. 2 is a first control port, P24 (ADcheck) is a detection port, and in the AD converter detection sub-circuit 200 connected between the detection port and the first control port, the current limiting module 201 provides a third level signal between a high level and a low level, and the level signal is stabilized by the filtering module 202.
Example five
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, as shown in fig. 2, on the basis of the fourth embodiment, a current limiting module 201 comprises:
one end of the first resistor R1 is connected with a singlechip power supply;
the negative electrode is connected with the other end of the first resistor R1, and the positive electrode is grounded to the zener diode D2;
one end of the second resistor R2 is connected to the connecting line between the first resistor R1 and the zener diode D2, and the other end of the second resistor R2 is connected to the filtering module 202.
In this embodiment, the zener diode D2, the first resistor R1, and the second resistor R2 together form a current limiting module, and according to the low level, the high level, and the reference voltage output by the first control port, a third level signal between the high level and the low level is provided to the detection port as a sampling level, so as to test whether the analog-to-digital conversion of the AD converter of the single chip Microcomputer (MCU) is normal.
Example six
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, as shown in fig. 2, on the basis of the fourth embodiment, a filtering module 202 comprises:
the third resistor R3 is connected between the port to be detected and the first control port;
and one end of the first capacitor C1 is connected to the connecting line between the port to be detected and the third resistor R3, and the other end of the first capacitor C is grounded.
In this embodiment, the third resistor R3 and the first capacitor C1 form an RC circuit for filtering, and provide a stable sampling signal for the singlechip 100.
Example seven
The embodiment of the invention provides an AD port self-checking circuit of a single chip microcomputer, as shown in fig. 2, on the basis of any one of the first to third embodiments, an AD channel switch detection sub-circuit 300 includes a fourth resistor R4 connected in series between any one of the to-be-detected AD ports and a second control port.
In this embodiment, the to-be-detected AD port to be detected connected can be replaced at will, and current limiting is achieved through the fourth resistor R4. In fig. 2, P22 (i_fan-ADcheck) is a second control port, ain1/P19 (i_fan) is one of the to-be-detected AD ports of the single chip Microcomputer (MCU), and a fourth resistor R4 is connected in series between the to-be-detected AD port Ain1/P19 and the second control port P22, and outputs a low level and a high level through the second control port P22 to detect whether the AD channel of the single chip microcomputer is switched to the to-be-detected AD port Ain 1/P19.
Specifically, when the second control port P22 outputs a low level (0V), the AD port Ain1/P19 to be detected samples 0V input voltage, and an AD conversion value 0 is obtained after the AD conversion is performed through an AD converter of the singlechip MCU;
when the second control port P22 outputs high level (5V), the AD port Ain1/P19 to be detected samples 5V input voltage, and the input voltage is converted by the AD converter of the MCU to obtain an AD conversion value 1023.
If the data received by the MCU in the two steps are correct within the error allowable range, the AD channel switcher correctly switches the AD port Ain1/P19, the second control port P22 is set to be in a high-resistance state, and the AD port Ain1/P19 can perform normal sampling work. If the data is not within the error allowable range, the switching abnormality is indicated.
Example eight
The embodiment of the invention provides an AD port self-checking circuit of a singlechip, as shown in fig. 2, on the basis of the seventh embodiment, the detection subcircuit 300 of the AD channel switcher further comprises a first diode D1, wherein the negative electrode of the first diode D1 is connected with a power supply of the singlechip 100, and the positive electrode of the first diode D1 is connected with a connecting line between a fourth resistor R4 and a second control port.
In this embodiment, the second control port and the AD port to be detected of the singlechip 100 are protected by the first diode D1.
Example nine
The embodiment of the invention provides a singlechip, which comprises an AD port self-checking circuit of any one of the embodiments one to eight.
In this embodiment, the detection sub-circuit 200 of the AD converter and the detection sub-circuit 300 of the AD channel switch are respectively connected between the detection port and the first control port and between any one of the to-be-detected AD port and the second control port of the single-chip microcomputer, so that the single-chip microcomputer itself has the self-detection function of the AD converter and the self-detection function of the AD channel switch, and no external circuit is needed, thereby simplifying the detection circuit, having low cost and not affecting the AD sampling performance.
Examples ten
The embodiment of the invention provides a water heater, which comprises an AD port self-checking circuit of any one of the embodiments one to eight.
In the embodiment, the water heater adopting the AD port self-checking circuit can realize the self-checking of the AD converter and the self-checking of the AD channel switcher in the use process, does not influence the AD sampling performance of the singlechip, and ensures the use safety of the circuit of the water heater.
In the AD port self-checking circuit provided by the invention, the AD converter detection sub-circuit and the AD channel switcher detection sub-circuit are respectively connected between the detection port and the first control port and between any AD port to be detected and the second control port, so that the self-checking of the AD converter and the self-checking of the AD channel switcher are realized. By arranging the voltage stabilizing sub-circuit between the singlechip power supply and the ground, the short circuit of the singlechip circuit power supply is avoided. The voltage stabilizing sub-circuit specifically adopts the second capacitor, so that the voltage change of the single-chip microcomputer power supply is stable, and stable reference voltage is provided for the single-chip microcomputer. In the detection sub-circuit of the AD converter, the current limiting module provides a third level signal between a high level and a low level, tests whether the analog-to-digital conversion of the AD converter of the singlechip is normal or not, and stabilizes the level signal through the filtering module. The third resistor and the first capacitor in the filtering module form an RC circuit for filtering, and a stable sampling signal is provided for the singlechip. In the detection subcircuit of the AD channel switcher, the AD port to be detected which needs to be detected can be replaced and connected at will, current limiting is realized through a fourth resistor, and a second control port of the singlechip and the AD port to be detected can be further protected through a first diode. The singlechip provided by the invention realizes the self-checking function of the AD converter and the self-checking function of the AD channel switcher, and has the advantages of no need of an external circuit, simplification of a detection circuit, low cost and no influence on AD sampling performance. The water heater provided by the embodiment of the invention adopts the water heater with the singlechip, can realize the self-detection of the AD converter and the self-detection of the AD channel switcher in the use process, does not influence the AD sampling performance of the singlechip, and ensures the use safety of a circuit of the water heater.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a AD port self-checking circuit of singlechip, its characterized in that is provided with AD port and control port on the singlechip, AD port includes detection port and a plurality of AD ports of waiting to detect, control port includes first control port and second control port, its characterized in that, AD port self-checking circuit includes:
the detection sub-circuit of the AD converter is connected between the detection port and the first control port, and provides a level between the low level and the high level for the detection port as a sampling level through the low level, the high level and the reference voltage output by the first control port, so as to test whether the analog-to-digital conversion of the AD converter of the singlechip is normal or not and realize self-detection of the AD converter of the singlechip;
and the detection subcircuit of the AD channel switcher is connected between any AD port to be detected and the second control port, and the detection subcircuit of the AD channel switcher of the singlechip is used for detecting whether the AD channel of the singlechip is switched to the AD port or not by outputting low level and high level through the second control port, so that the self-detection of the AD channel switcher of the singlechip is realized.
2. The AD port self-test circuit of claim 1, further comprising a voltage stabilizing sub-circuit connected between the power supply of the single-chip microcomputer and ground.
3. The AD port self-test circuit of the single-chip microcomputer according to claim 2, wherein the voltage stabilizing sub-circuit comprises a second capacitor, one end of the second capacitor is connected with a power supply of the single-chip microcomputer, and the other end of the second capacitor is grounded.
4. An AD port self-test circuit of a single-chip microcomputer according to any one of claims 1 to 3, wherein the AD converter detection sub-circuit comprises:
a current limiting module for providing a third level signal between a high level and a low level;
and the filtering module is used for stabilizing the level signal.
5. The AD port self-test circuit of the single-chip microcomputer as set forth in claim 4, wherein the current limiting module includes:
one end of the first resistor is connected with a singlechip power supply;
the negative electrode is connected with the other end of the first resistor, and the positive electrode is grounded;
one end of the filter module is connected to a connecting line between the first resistor and the voltage stabilizing diode, and the other end of the filter module is connected to the second resistor of the filter module.
6. The AD port self-test circuit of the single-chip microcomputer as set forth in claim 4, wherein the filter module includes:
a third resistor connected between the detection port and the first control port;
one end of the first capacitor is connected to the connecting line between the detection port and the third resistor, and the other end of the first capacitor is grounded.
7. The AD port self-test circuit of a single-chip microcomputer according to any one of claims 1 to 3, wherein the AD channel switch detection sub-circuit comprises a fourth resistor connected in series between any one of the to-be-detected AD ports and the second control port.
8. The AD port self-test circuit of claim 7, wherein the AD channel switch detection subcircuit further comprises a first diode having a negative electrode connected to a power supply of the single chip microcomputer and a positive electrode connected to a connection line between the fourth resistor and the second control port.
9. A single chip microcomputer, characterized by comprising an AD port self-test circuit as claimed in any one of claims 1-8.
10. A water heater comprising the AD port self-test circuit of any one of claims 1-8.
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| CN201910009655.8A CN109709863B (en) | 2019-01-05 | 2019-01-05 | AD port self-checking circuit of singlechip, singlechip and water heater |
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| CN201910009655.8A CN109709863B (en) | 2019-01-05 | 2019-01-05 | AD port self-checking circuit of singlechip, singlechip and water heater |
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| CN104215863A (en) * | 2014-09-30 | 2014-12-17 | 无锡康柏斯机械科技有限公司 | Testing method of AD port of 1U controller of grinding machine |
| CN104570793A (en) * | 2014-11-14 | 2015-04-29 | 南京航空航天大学 | Self-detection method for analog unit of flight control computer |
| CN206060730U (en) * | 2016-08-16 | 2017-03-29 | 河南思维自动化设备股份有限公司 | A kind of A/D change-over circuits with self-checking function |
| CN206627784U (en) * | 2017-01-16 | 2017-11-10 | 上海工程技术大学 | A kind of SCM Based automatic garage accelerator control system |
| CN107171667A (en) * | 2017-06-09 | 2017-09-15 | 江西联智集成电路有限公司 | Gradual approaching A/D converter and its self-sensing method |
| CN207135084U (en) * | 2017-08-17 | 2018-03-23 | 河南思维轨道交通技术研究院有限公司 | A kind of AD conversion mode realizes the circuit of on-off model detection |
| CN207164223U (en) * | 2017-09-29 | 2018-03-30 | 昆山锂享新能源科技有限公司 | A kind of dynamic lithium battery group self-test warning device |
| CN108802532A (en) * | 2018-06-15 | 2018-11-13 | 山东信通电子股份有限公司 | Hardware function self checking method |
| CN209388150U (en) * | 2019-01-05 | 2019-09-13 | 深圳市合信达控制系统有限公司 | A kind of port AD self-checking circuit, single-chip microcontroller and the water heater of single-chip microcontroller |
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