CN104703311B

CN104703311B - Single port digital communication

Info

Publication number: CN104703311B
Application number: CN201310664933.6A
Authority: CN
Inventors: 陈卫斌
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-12-10
Filing date: 2013-12-10
Publication date: 2020-06-02
Anticipated expiration: 2033-12-10
Also published as: CN104703311A

Abstract

The invention discloses a single-port digital communication, which is characterized in that the slave port output current capability is compatible with the output current of a host port, the slave port 0 and 1 output levels are compatible with the input level of the host port, meanwhile, the slave can conveniently judge that the host port outputs 0, 1 or high resistance, besides finishing some common digital communications, an ADC rule can be provided, the ADC reading result is read while being converted from a high bit, each bit of an ADC data register in an IC is set to be 1 before entering an ADC conversion section, a communication sequence enters the ADC conversion section, the cycle is started, the slave outputs the current bit =0, the slave outputs an analog quantity and a result of comparison of the slave to be measured, if the analog quantity is smaller than the measured value, the master sets the current bit =1, and continues the next bit cycle operation until the ADC conversion is finished.

Description

Single port digital communication

Technical Field

The invention relates to the technical field of induction cookers and ICs (integrated circuits), single-port digital communication, touch keys and LED display driving ICs thereof.

Background

The electromagnetic oven and its IC, the known electromagnetic oven technology has 3 kinds:

in the 1 st type, an oscillation circuit is formed by adopting four comparators IC such as LM339, an IGBT is driven by a triode circuit, a singlechip with ADC function samples current and voltage to calculate power, and the singlechip completes control; the oscillating circuit is not a resonant circuit, and the reason is that the low level time of the IGBT control grid pulse is fixed time determined by the RC delay circuit and cannot be changed along with the resonance change of the cookware, so that the IGBT is difficult to realize accurate voltage valley switching, the efficiency of electric power can be reduced, and the efficiency of the electric power is also specific to the specially-matched cookware;

in the 2 nd type, a singlechip with an ADC function outputs pulses, drives an IGBT through a triode circuit, samples current and voltage by the singlechip to further calculate power, and is controlled by the singlechip; the low level duration of the IGBT control grid pulse is determined by the programming of a single chip microcomputer and can change along with the change of a cooker, but the electric power efficiency of the IGBT control grid pulse is almost the same as that of the IGBT control grid pulse in the No. 1 because no proper resonance detection method exists; meanwhile, the single chip microcomputer is difficult to avoid the occurrence of the dead halt phenomenon;

in the 3 rd type, the 1 st type adopts a circuit integrated IC such as an oscillation circuit formed by an LM339 four comparator IC, an IGBT is driven through a triode circuit, a singlechip with an ADC function samples current and voltage to calculate power, and the singlechip completes control.

The scheme of the existing induction cooker is still very complex, a singlechip has an ADC function, a plurality of strands of connecting wires (generally more than 9 strands) are needed between a power plate and a display plate of the induction cooker, and meanwhile, no resonance control exists; meanwhile, the standby power consumption of the known induction cooker is preferably 1W.

An induction cooker IC or other application ICs need a digital communication system to complete the communication between a control system IC (such as an application system intelligent IC (integrated circuit) of an induction cooker control singlechip and the like) and an application operation IC (such as an induction cooker IC, a touch key, an LED display drive IC and the like); by known definition, the control system IC is the master and the application operating IC is the slave.

The port of the host for digital communication is called a host port for short; the host can be generally programmed, such as a singlechip, and the digital input and output ports of most of the singlechips can be used as host ports; for the application of the single chip microcomputer, the host port must be a port for digital communication, and other ports are not called as host ports in the invention, and other ports are alternatively called as host ports.

The invention discloses a port for digital communication of a slave machine, which is called a slave machine port for short; the known ports of the slave machines such as an LED display driver, an ADC, a touch key and other ICs are generally similar to the digital input/output port of a single chip microcomputer; the slave port must be a port for digital communication, and the other ports are not called slave ports by the present invention, and the other ports are alternatively called slave ports.

The host port and the slave port are collectively called communication ports.

The well-known communication port uses a 0 level and a VDD level to represent the

outputs

0 and 1.

The master and slave digital communications may employ single port digital communications, two port digital communications, or multi-port digital communications.

The known single-port digital communication includes an asynchronous digital communication port; the host computer should be more convenient to adopt an asynchronous communication port, but the design of the slave computer adopting the asynchronous communication port is more complicated; thus, known techniques, particularly IC communication ports, do not employ single port digital communication, but rather employ, for example, I2C communication ports, typically at least two port digital communication, rather than single port digital communication.

An induction cooker or other equipment, a display input board (abbreviated as a display board) thereof, is known to have no touch key and LED display driving IC, but have a touch key IC and an LED display driving IC respectively, and the two ICs generally adopt two-port digital communication such as I2C; in order to reduce the cost, the display panel is generally a single-layer PCB, two or more wiring centers may occur by using the touch key IC and the LED display driver IC, the wiring intersections are many, the wiring complexity is increased, many cross wires are required, and the production workload is increased.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a single-port digital communication, touch key and LED display driving IC, an induction cooker and an IC thereof.

The technical scheme for realizing the purpose is as follows:

the single-port digital communication is characterized in that the slave port output current capability is compatible with the host port output current.

The single-port digital communication is characterized in that the output levels of the

slave ports

0 and 1 are compatible with the input level of the host port, and meanwhile, the slave can conveniently judge whether the output of the host port is 0, 1 or high-resistance.

The single-port digital communication is characterized in that only 0 output level of the slave port is compatible with the input level of the host port, and meanwhile, the slave can conveniently judge that the host port outputs 0 and non-0.

The single-port digital communication is characterized in that only 1 output level of the slave port is compatible with the input level of the host port, and meanwhile, the slave can conveniently judge the 1 and non-1 output levels of the host port.

The single-port digital communication is characterized in that ADC regulations are adopted, ADC reading results are read while conversion is carried out from a high-order side, each position of an ADC data register in an IC is 1 before the ADC conversion section is entered, the ADC conversion section is entered in a communication sequence, circulation begins, a slave computer outputs a current position =0, the slave computer outputs an analog quantity and a result of comparison of the measured quantity, if the analog quantity is smaller than the measured quantity, the master computer is arranged at the current position =1, and next-order circulation operation is continued until ADC conversion is completed.

The touch key and LED display driving IC is characterized in that two functions of the touch key and LED display driving are integrated in one IC, and more importantly, some ports of the IC can be used for selectively driving LEDs, selecting the touch key and even a traditional keyboard.

The touch key and LED display driving IC is characterized in that the single-port digital communication technology is adopted.

The touch key and LED display driving IC is characterized by comprising a driving LED display synchronous port SY.

The touch key and LED display driving IC is characterized in that an ADC (analog to digital converter) rule is adopted to read the touch key or the keyboard.

The induction cooker IC is characterized in that a self-adaptive resonant circuit is arranged in the induction cooker IC.

The induction cooker IC of the invention is characterized in that a power calculation multiplier circuit is arranged inside the induction cooker IC.

The induction cooker IC is characterized in that a single-port digital communication technology is adopted to communicate with the master control single chip microcomputer.

The induction cooker IC is characterized in that an ADC circuit is arranged in the induction cooker IC to sample analog quantities such as input power of the induction cooker, IGBT temperature, pot bottom temperature and the like.

The induction cooker IC is characterized in that a DAC circuit is arranged inside the induction cooker IC to output power control signals of the induction cooker.

The induction cooker is internally provided with a display panel and a power panel, and is characterized in that the induction cooker IC is adopted on the power panel.

The induction cooker is characterized in that the display board and the power board are connected by 3 lines.

The induction cooker is characterized in that the touch key and the LED display driving IC are adopted on the display panel.

Drawings

FIG. 1 is a schematic waveform diagram of non-limiting single port digital communications of the present invention.

Fig. 2 shows a preferred non-limiting embodiment of the induction cooker according to the invention.

Fig. 3 is a schematic diagram of an application of the non-limiting touch key and the LED display driver IC [ fig. 2 part ].

Detailed Description

The invention will be further explained with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the present invention in which single-port digital communication is implemented in an induction cooker, wherein a single chip microcomputer communicates with 2 touch keys and an LED display driver IC and an induction cooker IC through 3 host ports, respectively; fig. 1 shows a schematic waveform diagram of an unlimited single-port digital communication. The adoption of single-port digital communication can effectively reduce the number of the host ports and the number of the slave ports, further reduce the packaging scale of the host IC and the slave IC, reduce the packaging cost, simplify the PCB and the connection thereof and further reduce the production cost.

The input digital 0 (or 1) can be reliably input when the input level of the host port is less than 0.3VDD (or more than 0.7 VDD); in the embodiment, the output level of the slave port adopts 0.2VDD [ 5V power supply, 1V ] to represent digital 0, 0.8VDD [ 5V power supply, and 4V ] to represent digital 1, so that the output level of the slave port of 0.2VDD/0.8VDD can be compatible with the input level of the host port. Meanwhile, the limited output current capability of the slave port is actively designed, such as the maximum output current of 0.2mA and the minimum output current of-0.2 mA, so that the current master port has sufficient capability to pull down the slave port to be close to 0V or pull up the slave port to be close to VDD, and therefore, the output current of 0.2mA/-0.2mA of the slave port can be compatible with the output current of the master port. Therefore, if the slave port level is less than 0.2VDD [ anti-interference, which can actually adopt 0.1VDD ], the master port outputs 0, if the slave port level is greater than 0.8VDD [ anti-interference, which can actually adopt 0.9VDD ], the master port outputs 1, otherwise, the master port is in a high-impedance state [ master port input state, which is satisfied ]. Therefore, the slave port can output 0 or 1 and simultaneously conveniently judge that the master port outputs 0, 1 or high resistance. The 0.2VDD/0.8VDD/0.2mA/-0.2mA can adjust design data due to compatible host port electrical parameters, such as 0.16VDD/0.84VDD/0.3mA/-0.3mA, and the like.

In fig. 1, the upper end number represents a time position or a slave horizontal position, the horizontal position represents a slave command position, or a storage bit corresponding to a command, or other bits corresponding to a command, etc., and the lower end number represents a number input from a slave port;

the communication protocol that it employs is such that,

the host port outputs 0, and the slave horizontal position counter is increased by 1;

if the host port is high-resistance, the slave port outputs a corresponding horizontal position number, optionally, the host port does not execute the high-resistance of the host port;

the 1 st output 1 of the host port represents that 0 is written from the horizontal position of the slave;

the 2 nd continuous output 1 of the host port represents the horizontal position writing 1 of the slave port;

the continuous 3 rd output 1 of the host port indicates that the slave horizontal position counter is set to 0;

the host must output 0;

starting from the 1 st output 1 of the host port, the execution is selected according to the command sequence, or the next horizontal setting operation is switched.

The following description of the communication procedure is continued with reference to the waveforms of fig. 1,

the horizontal position is left 0, the horizontal position of the slave is uncertain, the host port starts to keep outputting 0, the host port outputs 1, the historical horizontal position of the slave writes 0, the host port outputs 0 with high resistance and the slave port outputs 0, the host port outputs 1 for 2 times continuously and the historical horizontal position of the slave writes 1, the host port outputs 1 with high resistance and the slave port outputs 1, the host port outputs 1 for 3 times continuously and the horizontal position counter of the slave is set 0;

the horizontal position is 1 on the left, the port of the host outputs 0, the position counter of the slave is added with 1 (position = 1), the host is high-resistance, and the position of the slave read by the host is 1= 0;

the horizontal position is left 2, the port of the host outputs 0, the position counter of the slave is added with 1 (position = 2), the host is high-resistance, and the position of the slave read by the host is 2= 1;

the horizontal position is 3 on the left, the port of the host outputs 0, the position counter of the slave is added with 1 (position = 3), the high resistance of the host and the reading of the position of the slave by the host is 3=1 (if 0 is written in the position 3, the high resistance of the host can not be adopted, the same meaning is not expressed in the future), the output of the host is 1, the writing of 0 is carried out in the position 3 of the slave, the high resistance of the host and the position of the slave are 3=0, the high resistance of the host can not be adopted, and the same meaning is not expressed;

the horizontal position is 4 on the left, the host port outputs 0, the slave horizontal position counter adds 1 (position = 4), the host high resistance and the host reads the slave position 4=0, the host outputs 1 and the slave position 4 writes 0, the host high resistance and the slave position 4=0, the host continuously outputs 1 for the 2 nd time and writes 1 from the slave position 4, and the host high resistance and the host reads the slave position 4= 1;

horizontal position left 5, same as horizontal position left 4;

horizontal position left 6, same as horizontal position left 2;

the reading and writing operations of a plurality of slave positions are understood between the horizontal positions from left 6 to left 9, and the horizontal positions from left 7 to left 8 are not understood;

horizontal position left 9, same as horizontal position left 3;

horizontal position right 0, a new read-write cycle begins.

Starting from the horizontal position of the slave, starting with 0, a command, several bits typically being a command code, followed by read and write data, etc., this command sequence may follow a known method. As can be seen from the above communication procedure, a command sequence is operated by a start command [ while also being a horizontal position counter set to 0: the host port outputs 1 continuously for 3 times, writes a number 0 (the host port outputs 1 for 1 time), writes a number 1 (the host port outputs 1 continuously for 2 times), and adds 1 to the slave horizontal position counter (the host port outputs 0) for 4 operations, wherein the slave port can output a number between 4 operations, namely the host port can input a number. If the slave storage history data is not read, the following steps can be selected: start command [ host port outputs 1 2 consecutive times; if the 4 operations are compatible, the host port outputs 1 for 3 times continuously, and the host port outputs 1 for 2 times continuously, no response exists, the number is written to be 1 [ the host 1 outputs 1 ], the slave position counter is added with 1 and the number is written to be 0 [ the host outputs 0 ] 3 operations. It is also possible to meet specific application requirements, design command sequences for more than 4 operations, such as setting specific states, etc.

The single-port digital communication described above is asynchronous communication without a clock, unlike known clock communication, which is asynchronous communication without a clock.

The time length of outputting 0 or 1 by the host port can be selected to represent different operations, for example, the time length of outputting 0 by the host port is 5uS/10uS/15uS/20uS to represent writing number 0, writing number 1, adding 1 to the position counter of the slave machine, and starting 4 operations; as a sequence of write digit 0 operations: the host port outputs 1 or high impedance, the host port outputs 5uS duration of 0, and the host port outputs 1 or high impedance, if the host port is high impedance, the slave port outputs digits at the same time and the host port can input digits at the same time, the other operations are similar; if the duration of the master port outputting 0 or 1 is selected, the

slave port outputs

0 or 1 level compatibility, that is, if only one slave outputs compatible level, if the slave selects digital 0 compatibility, the slave port outputs digital 1 which may be VDD, and if the slave selects digital 1 compatibility, the slave port outputs digital 0 which may be 0V, but the slave port output current limitation still needs. However, if the characteristics of the MOS process and the singlechip are considered, it is more reasonable to adopt the slave port to output the high-low compatible level.

No matter the operation is represented by the time length of outputting 0 or 1 by the host port, or the operation is represented by the output sequence of 0, 1 and high resistance by the host port, or even other, the precondition is that the output current of the slave port is compatible with the output current of the host port, and the input level of the slave port is compatible with the input level of the host port to output 1, or output 0 and output 1, so that the slave port is the authorized port of the invention. In addition, from the level characteristics of the communication ports, in addition to the high and low levels of the master output, there are 1 or 2 obvious slave port output levels.

Different communication protocols can be selected in one IC according to different applications, for example, in the touch key and LED display driving IC, digital communication protocols (abbreviated as communication protocols) are adopted for the read-write LED buffer memory and the digital memory, and special communication protocols (abbreviated as ADC protocols) are adopted for the touch key conversion ADC.

According to the ADC rule, the other parts except the ADC conversion section are compatible with the communication rule, the ADC reading result is read while conversion is carried out from a high-order position, each position of an ADC data register in the IC is set to be 1 before the ADC conversion section is entered, the communication sequence enters the ADC conversion section, the cycle begins, a slave computer outputs the current position =0 of the ADC data register, the slave computer outputs the result of comparing the analog quantity converted by the ADC data register with the measured quantity, if the analog quantity is smaller than the measured quantity, the master computer is positioned at the current position =1 of the slave computer ADC data register, and the next cycle operation is continued until the ADC conversion is completed. It should be noted that, in order to accurately complete the ADC conversion, a sufficient time period is required for each bit conversion of the ADC.

Fig. 3, an electromagnetic oven display panel, a 5-pin electromagnetic oven master control single chip, wherein the master control single chip has 3 pins as host ports, except that there are 1 host port and the electromagnetic oven IC communication of the electromagnetic oven power board, also 2 host ports and 2 touch keys and LED display drive IC communication. The touch keys and the LED display driving IC with 20 feet below the display panel are the preferable non-limiting touch keys and the LED display driving IC which are more suitable for the display panel of the induction cooker, and 4 independent touch key ports, 8 touch keys and LED display driving ports and 4 independent LED driving ports with stronger driving capability are provided; wherein, 4 independent touch keyways are only suitable for the touch keys; the 8 touch keys and the LED display driving ports can select to drive the LEDs and also select the touch keys, but cannot simultaneously support driving the LEDs and the touch keys; the touch key is based on the capacitance of the detection port, and more parasitic capacitance is required to be added for supporting and driving the LED, so that the conversion of the touch key is not favorable, and therefore, the driving capability for supporting and driving the LED must be sacrificed; therefore, 4 independent LED driving ports with strong driving capability are designed for the display panel of the induction cooker, only the independent LED driving ports with strong driving capability can drive more LED luminous tubes, and certainly, the independent LED driving ports can also selectively support the driving of a buzzer and the like. The scales of the touch keys and the LED display driving IC are reduced on the display panel by 16 feet. Because 2 touch keys and LED display driving ICs are adopted on the display panel PCB, the PCB wiring is greatly simplified, a port can be selected nearby to support the touch keys or support LED display, the overline can be reduced compared with the known scheme, the interference of an induction cooker on the touch keys can be reduced, and the manufacturing cost is reduced.

FIG. 3, touch key and LED display driver IC, the communication port FT uses single port digital communication; because the touch key needs to detect the port capacitance, an ADC procedure is also needed; the LED display driving generally adopts a dynamic driving mode, a plurality of touch keys and an LED display driving IC need to be synchronous when the LED is driven to display, therefore, a driving LED display synchronous port SY is arranged, one touch key and the LED display driving IC are selected to be a master synchronous SY under the support of a master control single chip microcomputer, other touch keys and the LED display driving IC are slave synchronous SY, the master synchronous SY outputs a driving LED display synchronous signal, the slave synchronous SY receives the driving LED display synchronous signal, and the dynamic driving LED display is completed. In addition, the traditional key keyboard can be supported at the port supporting the touch keys, and the keys of the keyboard can be read through ADC rules.

Fig. 2, a power board-grid voltage Vac is sampled, a resistor R6 samples the grid voltage Vac and inputs the grid voltage Vac to an induction cooker IC, a high voltage MOS switch and an internal resistor are arranged inside a Vac terminal, one end of the high voltage MOS switch is connected with R6, the other end of the high voltage MOS switch is connected with the internal resistor, and the internal resistor is connected with AGND analog ground, so that the internal resistor divides the grid voltage Vac by using voltage; the high-voltage MOS switch can be turned off when the induction cooker is in standby, so that the standby consumption of R6 is eliminated, the standby power consumption of the induction cooker is reduced, and the high-voltage MOS switch is turned on when the induction cooker works; the internal resistance sample voltage can be used to: the method comprises the steps of self-adaptive resonance circuit, real-time power calculation, auxiliary cookware judgment, power grid voltage high-voltage protection, power grid surge protection and the like. The power grid surge protection adopts a slow tracking Vac circuit (capable of filtering fast power grid surge), and if the Vac is larger than the output of the slow tracking Vac circuit and is a fixed value, the power grid surge is considered to come, and further the power grid surge protection is implemented.

Fig. 2, a power board, namely an IGBT collector Vce is sampled, a resistor R5 samples the IGBT collector voltage and inputs the IGBT collector voltage to an induction cooker IC, a high voltage MOS switch and an internal resistor are arranged inside a Vce end, one end of the high voltage MOS switch is connected with R5, the other end of the high voltage MOS switch is connected with the internal resistor, and the internal resistor is connected with AGND, so that the internal resistor divides the IGBT collector Vce by using voltage; the high-voltage MOS switch can be turned off when the induction cooker is in standby, so that the standby consumption of R5 is eliminated, the standby power consumption of the induction cooker is reduced, and the high-voltage MOS switch is turned on when the induction cooker works; the internal resistance sample voltage can be used to: the self-adaptive resonant circuit, the IGBT ultrahigh voltage protection, the IGBT high voltage adjustment, the IGBT valley bottom adjustment and the like.

Fig. 2 shows that the power board-induction cooker IC, the adaptive resonant circuit thereof, detects a time length T1 when Vce is greater than the Vac period and detects a starting position when Vce is less than Vac according to the grid voltage Vac and the IGBT collector voltage Vce, and starts the next IGBT power period from the position delayed by (T1 × proportional parameter) to drive the IGBT gate to output a high level; the proportion parameter is generally about 0.4, the electromagnetic oven can be suitable for different electromagnetic oven cookers, and can track the resonance characteristic of the cookers, so that the IGBT valley bottom is accurately switched on and off; the output of the DAC circuit controls the duration of high level of the IGBT grid, namely the opening time of the IGBT, so that the input power or the output power of the induction cooker is controlled, and the input of the DAC circuit is realized by single-port FT digital communication. Adjusting the IGBT high voltage, if finding that the voltage Vce peak of the IGBT collector has a high voltage trend, preferentially adjusting the DAC circuit input on the electromagnetic oven IC internal circuit in a proper amount, reducing the input power of the electromagnetic oven and reducing the Vce peak; and (4) IGBT valley bottom adjustment, namely, if the voltage is higher and the IGBT is increased at the valley bottom of the voltage waveform of an IGBT collector, the internal circuit of the induction cooker IC properly heightens the DAC circuit input, the input power of the induction cooker is improved, the Vce peak is heightened, and the Vce valley bottom is reduced. Still other methods are applicable to adaptive resonant circuits, such as valley detection based on IGBT collector voltage Vce signals; or detecting the voltage valley of the IGBT collector through an external capacitor; importantly, the self-adaptive resonant circuit must be competent for the change of the cookware, track the resonant characteristics of the cookware, realize the accurate valley bottom switch of the IGBT and reduce the switching loss of the IGBT.

FIG. 2, a power board-grid current Iac is sampled, a constantan wire R1 samples a grid current Iac and is input to an induction cooker IC through an R4, an internal computing circuit at the Iac end keeps the Iac end equal to AGND analog ground, so that the R4 current represents the grid current Iac, and the grid current Iac is input to the Iac end;

fig. 2, POWER board-induction cooker IC-POWER calculation, there is a POWER calculation multiplier, one input of which is the voltage Vac divided by the grid voltage sampled inside the Vac terminal, and the other input of which is the grid current Iac sampled inside the Iac terminal, and the output of which is the current output and output to POWER terminal, where R11 precisely adjusts the induction cooker input POWER.

In the figure 2, the power board is in digital communication with the induction cooker IC and the FT end is in communication with the master control single chip microcomputer, so that the sampling of various induction cooker analog quantities ADC, the input of the induction cooker input power control DAC circuit and the input/output of various control digital quantities are completed.

Fig. 2, power board-induction cooker IC-other, FAN control output, V5 output 5V supply, Tigbt IBGT temperature sampling, Tmain pan bottom temperature sampling, IN 1/OUT 1 backup temperature sampling or drive output.

Fig. 2 and 3 show a display panel, which uses touch keys and LED display driving ICs to complete the input of touch keys of the induction cooker and the output of LED display. Generally, the electromagnetic oven scheme only needs 2 touch keys and an LED display driving IC.

Fig. 2 shows that the induction cooker and the master control single chip microcomputer adopt a known general single chip microcomputer without ADC function, 1 induction cooker IC and 2 touch keys and LED display driving ICs, and the master control single chip microcomputer only needs 3 common ports to complete 3 single-port digital communications, so that the power board and the display board only need 3 lines for connection, which is far superior to the connection of the known induction cooker with more than 9 lines. In addition, the number of the elements used by the electromagnetic oven is greatly reduced compared with the elements used by the known electromagnetic oven. It should be noted that there are many schemes for the induction cooker IC of the present invention, and FIG. 2 is a very advanced scheme, so that an infringer can use the design idea of the present invention to reduce the advancement of the induction cooker IC and avoid the infringement; therefore, the most important design ideas of the induction cooker are self-adaptive resonance, a power calculation multiplier and single-port digital communication.

The above embodiments are merely illustrative, not restrictive, and those skilled in the art may make various changes and modifications without departing from the spirit and scope of the invention, and therefore all equivalent technical solutions should fall within the scope of the invention, which should be limited only by the claims.

Claims

1. A single-port digital communication method is characterized in that a single chip microcomputer is adopted by a host, output levels 0 and 1 of a slave port are inconsistent with the output level of the host port, and the output current capability of the single chip microcomputer is compatible with the output of the host port, so that the safety of the slave port and the host port is ensured; the output levels of the slave machine ports 0 and 1 are compatible with the input level of the host machine port, the output levels of the slave machine ports 0 and 1 are different from the output level of the host machine port, and meanwhile, the slave machine can conveniently judge the output 0, the output 1 and the input state or the high resistance of the host machine port.

2. A single-port digital communication method is characterized in that a single chip microcomputer is adopted by a host, one of output levels of ports of a slave computer is inconsistent with that of the port of the host computer, and the output current capability of the slave computer is compatible with that of the port of the host computer, so that the safety of the ports of the slave computer and the host computer is ensured; the slave port only has 0 output level compatible with the input level of the host port, the slave port 0 is different from the output level of the host port, and meanwhile, the slave can conveniently judge the output 0, the input state or the high resistance of the host port.

3. A single-port digital communication method is characterized in that a single chip microcomputer is adopted by a host, one of output levels of ports of a slave computer is inconsistent with that of the port of the host computer, and the output current capability of the slave computer is compatible with that of the port of the host computer, so that the safety of the ports of the slave computer and the host computer is ensured; the slave port only has 1 output level compatible with the input level of the host port, the slave port 1 is different from the output level of the host port, and meanwhile, the slave can conveniently judge the output 1 and the input state or the high resistance of the host port.

4. A single-port digital communication method according to any one of claims 1 to 3, wherein, using ADC rules, reading ADC results while converting from high bit, before entering the ADC conversion section, each bit of the ADC data register in the IC is 1, when the communication sequence enters the ADC conversion section, the cycle starts, the slave computer outputs the current position 0, the slave computer outputs the analog quantity and the result of comparison between the measured quantity and the current position 1, if the analog quantity is smaller than the measured quantity, the master computer continues the next bit cycle operation until the ADC conversion is completed.