CN109709863A - A kind of port AD self-checking circuit, single-chip microcontroller and the water heater of single-chip microcontroller - Google Patents
A kind of port AD self-checking circuit, single-chip microcontroller and the water heater of single-chip microcontroller Download PDFInfo
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- 239000003990 capacitor Substances 0.000 claims description 10
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Abstract
The present invention is suitable for singlechip technology field, provide the port AD self-checking circuit, single-chip microcontroller and the water heater of a kind of single-chip microcontroller, it is intended to solve the problems, such as how the converter of single-chip microcontroller, AD censor key realize self-checking function.A kind of port AD self-checking circuit of single-chip microcontroller, comprising: the converter detection sub-circuit being connected between the detection port and the first control port；The AD censor key detection sub-circuit being connected between any port AD to be detected and the second control port.Low level, high level and the reference voltage that the present invention is exported by the first control port on single-chip microcontroller, the level provided between low level and high level gives detection port, whether the analog-to-digital conversion for testing converter is normal, realizes and carries out self-test to the converter that single-chip microcontroller carries；Whether it is switched on the port AD by the channel AD that the second control port exports low level and high level detection single-chip microcontroller, realizes and self-test is carried out to AD censor key.
Description
Technical field
The invention belongs to the port the AD self-checking circuit of singlechip technology field more particularly to a kind of single-chip microcontroller, single-chip microcontroller and
Water heater.
Background technique
AD conversion (Analog-to-Digital Convert) is exactly analog-to-digital conversion.It as its name suggests, is exactly analog signal
It is converted into digital signal, includes mainly integral form, successive approximation, compare type/serial parallel type, sigma-delta modulation type, capacitor parallel
Array gradually compares type and voltage to frequency conversion type.Converter is used to that analog quantity is changed into digital quantity by certain circuit.Mould
Analog quantity can be the electric signals such as voltage, electric current, be also possible to the non-electrical signals such as pressure, temperature, humidity, displacement, sound.But in AD
Before conversion, various physical quantitys must be converted into voltage signal through various sensors by the input signal for being input to converter.
Single-chip microcontroller (Microcontroller Unit, MCU) in the prior art has the function of AD, but does not have AD conversion
The self-checking function of device, AD censor key, converter, AD censor key self-checking function usually rely on periphery circuit or
Equipment realizes detection, causes entire circuit more complicated, higher cost, and the circuit due to realizing detection or equipment are peripheral hardwares
, the requirement of AD self-test can be unable to satisfy.
Summary of the invention
The present invention provides a kind of port the AD self-checking circuit of single-chip microcontroller, it is intended to solve converter, the channel AD of single-chip microcontroller
The problem of how realizing self-checking function of switch.
The invention is realized in this way a kind of port the AD self-checking circuit of single-chip microcontroller, the end AD is provided on the single-chip microcontroller
Mouth and control port, the port AD include detection port and several ports AD to be detected, and the control port includes the first control
Port processed and the second control port, which is characterized in that the port AD self-checking circuit includes:
The converter detection sub-circuit being connected between the detection port and the first control port；
The AD censor key detection sub-circuit being connected between any port AD to be detected and the second control port.
Further, the port AD self-checking circuit further includes the pressure stabilizing son electricity being connected between microcontroller power supply and ground
Road.
Further, the pressure stabilizing sub-circuit includes one end connection microcontroller power supply, the first capacitor of other end ground connection.
Further, which is characterized in that the converter detects sub-circuit and includes:
The current limliting module of third level signal between high level and low level is provided；
Filter module for stable level signal.
Further, the current limliting module includes:
The first resistor of one end connection microcontroller power supply；
Cathode connects the zener diode of the first resistor other end, plus earth；
One end is connected on the connecting line between the first resistor and the zener diode, and the other end connects the filter
The second resistance of wave module.
Further, the filter module includes:
It is connected to 3rd resistor between the port to be detected and the first control port；
One end is connected on the connecting line between the port to be detected and the 3rd resistor, other end ground connection first
Capacitor.
Further, AD censor key detection sub-circuit include be connected in any port AD to be detected with
The 4th resistance between second control port.
Further, the AD censor key detection sub-circuit further includes that cathode connects microcontroller power supply, anode even
Connect the first diode on the connecting line between the 4th resistance and second control port.
The present invention also provides a kind of single-chip microcontrollers, including the above-mentioned port AD self-checking circuit.
The present invention also provides a kind of water heaters, including the above-mentioned port AD self-checking circuit.
In the port the AD self-checking circuit of single-chip microcontroller provided in an embodiment of the present invention, due in detection port and the first control terminal
Converter detection sub-circuit, the channel AD have been separately connected between mouthful, between any port AD to be detected and the second control port
Switch detects sub-circuit, realizes converter and carries out self-test and the progress self-test of AD censor key.By on single-chip microcontroller
The first control port output low level, high level and reference voltage, the level between low level and high level is provided
Detection port is given, whether the analog-to-digital conversion for testing converter is normal, realizes and carries out self-test to the converter that single-chip microcontroller carries；It is logical
Whether the channel AD for crossing the second control port output low level and high level detection single-chip microcontroller is switched on the port AD, realizes to AD
Censor key carries out self-test.
Detailed description of the invention
Fig. 1 is the port the AD self-checking circuit block diagram for the single-chip microcontroller that the embodiment of the present invention one provides；
Fig. 2 is the port the AD self-checking circuit figure for the single-chip microcontroller that the embodiment of the present invention two to eight provides.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, comprising: is connected to detection port and the
Converter between one control port detects sub-circuit, and be connected to any port AD to be detected and the second control port it
Between AD censor key detect sub-circuit.Converter detects what sub-circuit was exported by the first control port on single-chip microcontroller
Low level, high level and reference voltage, the level provided between low level and high level give detection port, test single-chip microcontroller
Converter analog-to-digital conversion it is whether normal, realize converter self-test；AD censor key detects in sub-circuit, by the
Whether the channel AD of two control ports output low level and high level detection single-chip microcontroller is switched on the port AD, realizes that the channel AD is cut
Parallel operation self-test.
Embodiment one
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Figure 1, setting on single-chip microcontroller 100
It is equipped with the port AD and control port, the port AD includes detection port and several ports AD to be detected, and control port includes the first control
Port processed and the second control port, the port AD self-checking circuit include:
The converter detection sub-circuit 200 being connected between detection port and the first control port；
The AD censor key detection sub-circuit 300 being connected between any port AD to be detected and the second control port.
The working principle of the port the AD self-checking circuit of above-mentioned single-chip microcontroller is:
Converter detects in sub-circuit 200, passes through the low level of the first control port output on single-chip microcontroller 100, height
Level and reference voltage, the level provided between low level and high level give detection port, and as sampled level, test is single
Whether the analog-to-digital conversion of the converter of piece machine 100 is normal, realizes and carries out self-test to the converter that single-chip microcontroller 100 carries；AD
Censor key detects in sub-circuit 300, and the AD for exporting low level and high level detection single-chip microcontroller by the second control port is logical
Whether road is switched on the port AD, realizes and carries out self-test to the AD censor key that single-chip microcontroller 100 carries, can satisfy
The requirement of EN60730 standard AD self-test.
In the present embodiment, single-chip microprocessor MCU has multi-channel A/D port, but only one converter, so the channel AD is needed to cut
Parallel operation realizes the switching of the port AD.It is normal to ensure to switch, before acquiring data, need first to detect the switching of AD censor key
It is whether normal.Due between detection port and the first control port, between any port AD to be detected and the second control port
It has been separately connected converter detection sub-circuit 200, AD censor key detection sub-circuit 300, has realized that converter carries out certainly
Inspection and AD censor key carry out self-test.
In the port the AD self-checking circuit of single-chip microcontroller provided in an embodiment of the present invention, due in detection port and the first control terminal
Converter detection sub-circuit, the channel AD have been separately connected between mouthful, between any port AD to be detected and the second control port
Switch detects sub-circuit, realizes converter and carries out self-test and the progress self-test of AD censor key.By on single-chip microcontroller
The first control port output low level, high level and reference voltage, the level between low level and high level is provided
Detection port is given, whether the analog-to-digital conversion for testing converter is normal, realizes and carries out self-test to the converter that single-chip microcontroller carries；It is logical
Whether the channel AD for crossing the second control port output low level and high level detection single-chip microcontroller is switched on the port AD, realizes to AD
Censor key carries out self-test.
Embodiment two
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Fig. 2, in the base of embodiment one
On plinth, the port AD self-checking circuit further includes the pressure stabilizing sub-circuit 400 being connected between 100 power supply of single-chip microcontroller and ground.
In the present embodiment, pass through the setting pressure stabilizing son electricity between 100 power supply (+5V-AD) of single-chip microcontroller and ground (GND-5V-AD)
Road 400 avoids single-chip microcontroller line power short circuit.
Embodiment three
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Fig. 2, in the base of embodiment two
On plinth, pressure stabilizing sub-circuit 400 includes that one end connects 100 power supply of single-chip microcontroller, the second capacitor C2 of other end ground connection.
In the present embodiment, pressure stabilizing sub-circuit 400 specifically uses the second capacitor C2, and realizing makes 100 supply voltage of single-chip microcontroller
Variation is steady, and stable reference voltage is provided to single-chip microcontroller 100.
Example IV
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Fig. 2, in embodiment one to three
On the basis of middle any embodiment, converter detection sub-circuit 200 includes:
The current limliting module 201 of third level signal between high level and low level is provided；
Filter module 202 for stable level signal.
In the present embodiment, the Ain6/P29 (ADcheck-DetSelf) in Fig. 2 is the first control port, P24
It (ADcheck) is detection port, the converter detection sub-circuit 200 being connected between detection port and the first control port
In, current limliting module 201 provides the third level signal between high level and low level, and is stablized by filter module 202
Level signal.
Embodiment five
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Fig. 2, in the base of example IV
On plinth, current limliting module 201 includes:
The first resistor R1 of one end connection microcontroller power supply；
Cathode connects the zener diode D2 of the first resistor R1 other end, plus earth；
One end is connected on the connecting line between first resistor R1 and zener diode D2, and the other end connects filter module
202 second resistance R2.
In the present embodiment, zener diode D2 and first resistor R1, second resistance R2 collectively constitute current limliting module, according to the
Low level, high level and the reference voltage of one control port output, provide the third level between high level and low level
For signal to detection port as sampled level, whether the analog-to-digital conversion for testing the converter of single-chip microcontroller (MCU) is normal.
Embodiment six
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Fig. 2, in the base of example IV
On plinth, filter module 202 includes:
It is connected to 3rd resistor R3 between port to be detected and the first control port；
The first capacitor that one end is connected on the connecting line between port to be detected and 3rd resistor R3, the other end is grounded
C1。
In the present embodiment, 3rd resistor R3 and first capacitor C1 constitute RC circuit, for filtering, provide for single-chip microcontroller 100
Stable sampled signal.
Embodiment seven
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Fig. 2, in embodiment one to three
On the basis of middle any embodiment, AD censor key detection sub-circuit 300 includes being connected in any port AD to be detected
The 4th resistance R4 between the second control port.
In the present embodiment, the port AD to be detected that connection needs to detect can be arbitrarily replaced, is realized and is limited by the 4th resistance R4
Stream.P22 (I_fan-ADcheck) in Fig. 2 is the second control port, Ain1/P19 (I_fan) be single-chip microcontroller (MCU) wherein
One port AD to be detected, the 4th resistance R4 are connected between the port AD Ain1/P19 to be detected and the second control port P22, are led to
Whether the channel AD for crossing the second control port P22 output low level and high level detection single-chip microcontroller is switched to the port AD to be detected
On Ain1/P19.
Specifically, when the second control port P22 exports low level (0V), the port AD Ain1/P19 to be detected samples 0V
Input voltage obtains AD conversion value 0 after the converter of single-chip microprocessor MCU is converted；
When the second control port P22 exports high level (5V), the port AD Ain1/P19 to be detected samples 5V input voltage,
AD conversion value 1023 is obtained after the converter of single-chip microprocessor MCU is converted.
If the data that single-chip microprocessor MCU receives in two above step are all correct in allowable range of error, then it represents that AD
Censor key correctly switches on the Ain1/P19 of the port AD, and the second control port P22 is set to high-impedance state, the port AD
Ain1/P19 can carry out normal sample work.If data are not in allowable range of error, then it represents that switching is abnormal.
Embodiment eight
The embodiment of the invention provides a kind of port the AD self-checking circuits of single-chip microcontroller, as shown in Fig. 2, in the base of embodiment seven
On plinth, AD censor key detection sub-circuit 300 further includes that cathode connects 100 power supply of single-chip microcontroller, anode is connected to the 4th resistance
First diode D1 on connecting line between R4 and the second control port.
In the present embodiment, by first diode D1 protect single-chip microcontroller 100 the second control port and the end AD to be detected
Mouthful.
Embodiment nine
The embodiment of the invention provides a kind of single-chip microcontroller, the AD including any embodiment in claim embodiment one to eight
Port self-checking circuit.
In the present embodiment, by between the detection port and the first control port of single-chip microcontroller, any port AD to be detected
Converter detection sub-circuit 200, AD censor key detection sub-circuit 300 are separately connected between the second control port, it is real
Existing single-chip microcontroller itself has converter self-test and AD censor key self-checking function is simplified without external circuit
Detection circuit, it is at low cost, and AD sampling performance is not influenced.
Embodiment ten
The embodiment of the invention provides a kind of water heater, the AD including any embodiment in claim embodiment one to eight
Port self-checking circuit.
In the present embodiment, using the water heater of the above-mentioned port AD self-checking circuit, it can realize that AD turns in use
Parallel operation self-test and AD censor key self-test, and the AD sampling performance of single-chip microcontroller itself is not influenced, it ensure that the electricity of water heater
Road uses safe.
In the self-checking circuit of the port AD provided by the invention, due to detection port and the first control port between, it is any to
Converter detection sub-circuit, AD censor key detection son electricity have been separately connected between the detection port AD and the second control port
Road realizes that converter carries out self-test and AD censor key carries out self-test.By being arranged between microcontroller power supply and ground
Pressure stabilizing sub-circuit avoids single-chip microcontroller line power short circuit.Pressure stabilizing sub-circuit specifically uses the second capacitor, and realizing makes single-chip microcontroller
Mains voltage variations are steady, and stable reference voltage is provided to single-chip microcontroller.Converter detects in sub-circuit, and current limliting module provides
Third level signal between high level and low level, whether the analog-to-digital conversion for testing the converter of single-chip microcontroller is normal,
And pass through filter module stable level signal.3rd resistor and first capacitor constitute the RC circuit for filtering in filter module,
Stable sampled signal is provided for single-chip microcontroller.AD censor key detects in sub-circuit, can arbitrarily replace what connection needed to detect
The port AD to be detected, and current limliting is realized by the 4th resistance, it can also further pass through the of first diode protection single-chip microcontroller
Two control ports and the port AD to be detected.Single-chip microcontroller provided by the invention realizes single-chip microcontroller itself and has converter self-test
And AD censor key self-checking function simplifies detection circuit without external circuit, it is at low cost, and do not influence AD and adopt
Sample performance.Water heater provided in an embodiment of the present invention can be realized in use using the water heater of above-mentioned single-chip microcontroller
Converter self-test and AD censor key self-test, and the AD sampling performance of single-chip microcontroller itself is not influenced, it ensure that water heater
Circuit using safe.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of port the AD self-checking circuit of single-chip microcontroller, which is characterized in that be provided with the port AD and control terminal on the single-chip microcontroller
Mouthful, the port AD includes detection port and several ports AD to be detected, and the control port includes the first control port and the
Two control ports, which is characterized in that the port AD self-checking circuit includes:
The converter detection sub-circuit being connected between the detection port and the first control port；
The AD censor key detection sub-circuit being connected between any port AD to be detected and the second control port.
2. the port the AD self-checking circuit of single-chip microcontroller as described in claim 1, which is characterized in that the port AD self-checking circuit is also
Including the pressure stabilizing sub-circuit being connected between microcontroller power supply and ground.
3. the port the AD self-checking circuit of single-chip microcontroller as claimed in claim 2, which is characterized in that the pressure stabilizing sub-circuit includes one
End connection microcontroller power supply, the second capacitor of other end ground connection.
4. the port the AD self-checking circuit of single-chip microcontroller as claimed any one in claims 1 to 3, which is characterized in that the AD turns
Parallel operation detects sub-circuit
The current limliting module of third level signal between high level and low level is provided；
Filter module for stable level signal.
5. the port the AD self-checking circuit of single-chip microcontroller as claimed in claim 4, which is characterized in that the current limliting module includes:
The first resistor of one end connection microcontroller power supply；
Cathode connects the zener diode of the first resistor other end, plus earth；
One end is connected on the connecting line between the first resistor and the zener diode, and the other end connects the filtering mould
The second resistance of block.
6. the port the AD self-checking circuit of single-chip microcontroller as claimed in claim 4, which is characterized in that the filter module includes:
It is connected to 3rd resistor between the port to be detected and the first control port；
The first electricity that one end is connected on the connecting line between the port to be detected and the 3rd resistor, the other end is grounded
Hold.
7. the port the AD self-checking circuit of single-chip microcontroller as claimed any one in claims 1 to 3, which is characterized in that the AD is logical
It includes the 4th resistance being connected between any port AD to be detected and the second control port that road switch, which detects sub-circuit,.
8. the port the AD self-checking circuit of single-chip microcontroller as claimed in claim 7, which is characterized in that the AD censor key detection
Sub-circuit further includes that cathode connects microcontroller power supply, anode is connected between the 4th resistance and second control port
First diode on connecting line.
9. a kind of single-chip microcontroller, which is characterized in that including the described in any item port the AD self-checking circuits of claim 1-8.
10. a kind of water heater, which is characterized in that including the described in any item port the AD self-checking circuits of claim 1-8.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN109709863B CN109709863B (en) | 2024-03-08 |
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| CN103777137A (en) * | 2014-01-15 | 2014-05-07 | 上海诺雅克电气有限公司 | Electronic circuit breaker with self-checking function and self-diagnosis method thereof |
| 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 |
| US20160134269A1 (en) * | 2014-11-12 | 2016-05-12 | Yokogawa Electric Corporation | I/o module |
| 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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