KR101766349B1

KR101766349B1 - Slope control circuit of communication transceiver for vehicular and slope control method using the same

Info

Publication number: KR101766349B1
Application number: KR1020160006673A
Authority: KR
Inventors: 김재준; 김대웅
Original assignee: 울산과학기술원
Priority date: 2016-01-19
Filing date: 2016-01-19
Publication date: 2017-08-08
Also published as: KR20170086975A

Abstract

The present invention relates to a vehicular communication transceiver, and more particularly, to a vehicular communication transceiver including a delay detector for detecting a delay or a delay by analyzing a slope control signal generated to control a slope of an output signal among output signals fed back to an RXD stage, A tilt adjusting unit for adjusting the tilt of the tilt control signal according to the voltage value and the current amount corresponding to the tilt setting signal and outputting the adjusted tilt setting signal so that the tilt of the tilt adjusting signal can be readjusted within a predetermined period, And a drive signal output unit for generating and outputting an output signal at a slope corresponding to the voltage value and the current amount of the readjusted tilt control signal, wherein the delay of the output signal of the vehicular communication transceiver is detected through a slope of the tilt control signal And corrects the slope of the tilt control signal so that the output signal It is possible to reduce the electromagnetic interference in the low slope control mode and to transmit and receive the control signals stably.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a slope control circuit for a vehicle communication transceiver, and a slope control circuit using the slope control circuit.

More particularly, the present invention relates to a vehicular communication transceiver, and more particularly, to a vehicle communication transceiver that detects whether an output signal from a vehicular communication transceiver is delayed through a slope of a slope control signal, corrects a slope of the slope control signal, And more particularly, to a tilt control circuit for a vehicular communication transceiver and a tilt control method using the tilt control circuit so that control signals can be transmitted and received stably by reducing electromagnetic interference in a control mode.

In general, automotive communication systems are applied in accordance with communication protocols in a relatively simple bus system as compared to other electronic products. Specifically, a CAN bus such as CAN_HIGH, CAN_LOW, and CAN_GND (ground) using as few as two bus lines, including a Local Interconnect Network Bus (LIN) bus including only one transmission line, ) Are used.

In addition, in order to further improve the data transmission speed, CAN flexible data rate (CAN FD) protocol has been proposed and applied to Korean Patent Registration No. 10-1519793 (registered on Feb. 2, 2015). According to the CAN FD protocol, the actual useful data of the CAN frame is transmitted at a higher transmission rate than that defined in the CAN 2.0 protocol.

As described above, a circuit block necessary for the LIN bus, the CAN bus, and the CAN FD protocol is a tilt control block for controlling the slope of the driving signal at the driving signal output terminal. Conventionally, in order to control the amount of current or set the slope in the output stage circuits such as the LIN bus and the CAN bus, the switching signal outputting the driving signal must be subtracted one by one.

In the normal slope control mode which does not consider the EMI problem as electromagnetic noise, since the slope or delay of the driving signal is not taken into consideration, only the driving signal is outputted. However, in the low slope control mode in which the driving signal should be output more stably considering the electromagnetic interference problem, the slope of the driving signal must be always detected and controlled at the driving signal output terminal.

However, in order to solve the EMI problem in the arrangement structure of the switching device (for example, Power MOSFET) in which the driving signal is outputted in an open drain structure, the slope of the driving signal has to be adjusted at the output terminal at which the driving signal is output. At this time, the slope of the output signal is controlled by subtracting the switching signal outputting the driving signal one by one. Therefore, in the conventional LIN bus, the CAN bus, and the CAN FD protocol, the output stage circuit structure has been complicated, and the circuit structure, size, and chip size are also increased.

Patent Registration No. 10-1519793 (Feb. 6, 2015)

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems by providing a vehicular communication transceiver for detecting a delay of an output signal of a vehicular communication transceiver through a slope of a slope control signal and correcting a slope of the slope control signal, And to provide a tilt control circuit of a vehicular communication transceiver and a tilt control method using the tilt control circuit so that control signals can be transmitted and received stably by reducing electromagnetic interference in a control mode.

According to another aspect of the present invention, there is provided a tilt control circuit for a vehicular communication transceiver, the tilt control circuit for analyzing a tilt control signal generated to control a tilt of an output signal among output signals fed back to an RXD stage, A switching signal generator for generating a slope setting signal so that the slope of the slope control signal for which the slope of the slope control signal is detected can be readjusted within a predetermined period, And a drive signal output unit for generating and outputting an output signal at a slope corresponding to a voltage value and a current amount of the readjusted tilt control signal.

According to another aspect of the present invention, there is provided a tilt control method using a tilt control circuit of a vehicular communication transceiver, the method including controlling a tilt of an output signal of an output signal fed back to an RXD stage using a delay detector, Analyzing the generated slope control signal to detect whether or not it is delayed; Generating a slope setting signal so that the slope of the slope control signal detected as a delayed state can be readjusted within a predetermined period by using the switching signal generator; and controlling the voltage value and the current amount corresponding to the slope setting signal Adjusting the slope of the tilt control signal and outputting the tilt signal; and generating and outputting an output signal at a slope corresponding to the voltage value and the current amount of the tilt control signal readjusted using the drive signal output unit.

According to the tilt control circuit of the vehicle communication transceiver of the present invention and the tilt control method using the tilt control circuit, it is possible to detect the delay of the output signal of the vehicular communication transceiver through the slope of the slope control signal, correct the slope of the slope control signal, So that the electromagnetic interference can be reduced in the low slope control mode, so that the control signals can be transmitted and received stably.

The output signal of the CAN, LIN, or FlexRay module is detected by detecting the delay of the output signal of the vehicular communication transceiver through the slope of the slope control signal and correcting the slope of the slope control signal. There is an effect that the circuit structure can be miniaturized by controlling the slope with a simpler and easier structure.

Particularly, there is an effect that a chip size can be seen by reducing the number of input pads by reducing the number of pins when a chip is formed while simplifying a circuit structure.

1 is a block diagram of a tilt control circuit of a vehicular communication transceiver according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining a tilt control method using the tilt control circuit shown in FIG.
3 is a waveform diagram showing an output waveform of the tilt control circuit shown in Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

When a communication transceiver (e.g., a CAN, LIN, FlexRay transceiver) according to a vehicle communication protocol transmits a digital signal from a microprocessor (for example, an ECU) to a TXD terminal, which is an input terminal of a communication transceiver, The transmission signal having the same phase, which is output at this time, is fed back to the RXD terminal, which is a feedback signal input terminal of the microprocessor, to transmit a signal in a data path structure to confirm the output of the transmitted signal.

For example, if a microprocessor transmits a digital bitstream conforming to the ISO standard according to the CAN communication method, the LIN method, or the CAN FD communication method, the signal is received from the CAN transceiver or the LIN transceiver and transmitted to the output bus line . For this purpose, the parameters required by the International Organization for Standardization (CAN) standards for CAN, LIN, and CAN FD must be met by communication transceivers such as CAN, LIN, and CAN FD.

1 is a block diagram of a tilt control circuit of a vehicular communication transceiver according to an embodiment of the present invention.

As shown in FIG. 1, a vehicle communication transceiver may be roughly divided into a transmitter 100 and a receiver 200. The tilt control circuit of the present invention can be configured to be included in either the transmission unit 100 or the reception unit 200, but an example included in the transmission unit 100 will be described below. In addition, the receiving unit 200 may be an integrated transmitting / receiving unit in which at least one of a CAN, a LIN, and a FlexRay transmitting / receiving unit is integrally configured. Hereinafter, an example configured by a LIN receiving unit will be described.

The tilt control circuit according to the present invention includes a delay detector 110 for detecting a delay time by analyzing a slope control signal generated to control a slope of an output signal among output signals fed back to the RXD stage of the microprocessor, A switching signal generator 130 for generating a tilt setting signal so that the tilt of the tilt control signal can be readjusted within a preset period, a tilt adjusting circuit 130 for adjusting the tilt of the tilt control signal according to the voltage value and the current amount corresponding to the tilt setting signal, A drive signal output unit 150 for generating and outputting an output signal at a slope corresponding to the voltage value and the current amount of the readjusted tilt control signal, And a receiving unit 200 for transmitting and receiving a transmission / reception signal.

The delay detector 110 receives a slope control signal that is generated to control the slope of the output signal among the output signals fed back to the RXD stage of the microprocessor. Then, the slope of the delayed waveform is detected by analyzing the feedback control signal. The tilt control signal may be a switching signal for outputting the output signal from the driving signal output unit 150. The tilt control signal controls the amount of current input to the driving switch of the driving signal output unit 150 . The longer the slope of the tilt control signal, the more free the effect of noise due to the electromagnetic interference, but the shorter the slope of the delay, the more noise is affected. According to the communication protocol of automobile, in particular, according to the LIN communication method of ISO17987-4, the delay of the TXD, which is the output terminal of the microprocessor, and the RXD, which is the feedback unit, Therefore, the delay detector 110 detects whether the delayed and delayed level of the fed back tilt control signal is within a range of 6 mu s or less. If the delay of the tilt control signal and the slope of the delay are longer than 6 mu s, it is determined that the delay is longer than the reference range and a delay confirmation signal is output.

The switching signal generator 130 receives a delay confirmation signal including a delay detection signal from the delay detector 110 and a delay signal. Then, the slope setting signal is generated and output so that the delay degree of the slope control signal delayed by 6 ㎲ or more or the delayed slope thereof can be readjusted within the preset 6 기간 period.

In particular, the switching signal generator 130 may include an n-bit counter and a shift register of a D flip-flop (DF / F) series-connected type. Accordingly, in the n-bit counter, the period of the clock x2 ^(n-1) from the time when the reset is started is output after the overflow signal. For example, a 2.5 MHz clock is input to an n-bit counter to output an overflow clock after 6 s.

The overflow clock signal output after 6 μs is compared with the delayed signal. If the delayed signal is generated after the overflow signal, a shift signal of the shift register is additionally generated to further output the slope setting signal, which is a switching signal. That is, in the D flip-flop, when the input delay signal exceeds the overflow clock signal generated after 6 μs, the output signal is transmitted to the shift register. Accordingly, the shift register outputs a slope setting signal for sequentially turning on the switches.

Thereafter, in the next cycle, the overflow clock signal output after 6 μs is compared with the delayed signal. If the delay signal occurs even after the overflow signal, the switching signal of the shift register is additionally generated. Thus, when the switching signal of the shift register is additionally generated every cycle, the amount of the output current becomes large, so that the time to reach the high level or the low level becomes shorter even if the voltage of the output signal remains the same. That is, the slope of the output signal is reduced. If the delay signal is delayed before the overflow signal output after 6 μs after the switching signal of the shift register is additionally generated every cycle, it is determined that the output signal is not delayed and the number of switching signal outputs of the shift register is maintained So that the delayed output is prevented.

When the delay signal is generated again after the overflow signal in the operation process, the switching signal of the shift register, that is, the slope setting signal, is additionally generated so that the slope or the delay time is maintained within 6 μs.

The tilt adjusting unit 140 adjusts the tilt of the tilt control signal according to the voltage value and the current amount corresponding to the tilt setting signal, and outputs the adjusted tilt control signal. Specifically, the tilt adjusting unit 140 increases the number of turn-on switching elements according to the number of switching of the tilt setting signal so that the amount of output current of the signal for driving the driving element is increased.

In other words, the tilt adjusting unit 140 extends a switch that is turned on according to the number of tilt setting signals, and outputs a tilt control signal having a voltage value and a current amount for turning on the driving switch formed in the driving signal output unit 150 As shown in FIG. For this purpose, the tilt adjusting unit 140 may include a plurality of mirror circuits that perform a current mirror function, and an inverter trimming circuit that drives the gate of a drive switch composed of MOSFETs.

For example, the tilt adjusting unit 140 may include a plurality of PMOS FETs having different MOS sizes and one or more PMOS FETs connected to the PMOS FETs in series in accordance with at least one of the tilt setting signals, A PMOS mirror circuit part composed of a plurality of first switches for outputting the output signal of the PMOS FET as a trimming signal, a plurality of NMOS FETs having different MOS sizes to perform a current mirror function opposite to the PMOS mirror circuit part, An NMOS mirror circuit part including a plurality of second switches connected in series to each other and outputting an output signal of one of the NMOS FETs connected thereto in accordance with at least one set signal of the slope setting signal as a trimming signal; The gate of the driving switch is driven in accordance with a trimming signal and a trimming signal of the NMOS mirror circuit portion May include an inverter trimming circuit for outputting a tilt control signal.

Accordingly, the tilt adjusting unit 140 outputs a tilt control signal having a tilt setting signal, that is, an amount of current that increases according to the number of the turn-on switches. That is, the tilt adjusting unit 140 generates and outputs a tilt control signal having different voltage values and current amounts for turning on the driving switch formed on the driving signal output unit 150.

The tilt control signal may be a control signal that is applied to the gate terminal of the driving switch and set a different time period for reaching the threshold voltage when the driving switch is driven.

The driving signal output unit 150 includes a driving switch formed of a MOSFET. The driving signal output unit 150 outputs an output signal to the external transceiver at a slope corresponding to the voltage value and the current amount of the slope control signal input from the slope adjusting unit 140 And outputs it. In other words, according to the tilt control signal of the tilt adjusting unit 140, the voltage and speed of the voltage entering the driving switch gate are adjusted to generate and output an output signal having a slope corresponding to the voltage and current amount do.

For example, the driving signal output unit 150 includes a driving switch formed of a MOSFET and implementing an open drain function. A tilt control signal is input to the gate terminal of the driving switch to generate and output an output signal having a slope corresponding to the voltage and current amount of the tilt control signal input to the gate of the driving switch. That is, the time required to reach the threshold voltage when the driving switch is driven by the tilt control signal is set differently, and the output signal having the slope according to the voltage and the current amount of the tilt control signal is output. In this way, the slope of the LIN bus end is adjusted by adjusting the gate voltage driving the drive switch implementing the open drain function.

FIG. 2 is a flowchart for explaining a tilt control method using the tilt control circuit shown in FIG.

Referring to FIGS. 2 and 3, the slope control method using the slope control circuit will be described. First, the delay detection unit 110 analyzes the feedback slope control signal among the output signals fed back to the RXD stage of the microprocessor, And detects the delayed slope (S1, S2). In particular, whether or not the delay of the feedback tilt control signal and the slope of the delayed waveform correspond to a period within a range of 6 mu s is detected (S3).

The longer the slope of the slope control signal, the more free the effect of the noise due to the electromagnetic interference, but the shorter the slope of the delay is affected by the noise.

Accordingly, depending on the vehicle communication protocol, the degree of delay is allowed within a period of not more than 6 占 퐏. Accordingly, the delay detector 110 detects whether the delay of the fed-back tilt control signal or the delayed slope falls within a period of 6 mu s or less as shown in FIG. When the degree of delay or the delay of the delay becomes longer than 6 占 퐏, it is determined that the delay is longer than the reference range, and a delay confirmation signal is outputted.

[Table 1]

Table 1 below shows pram31 defined in Table 11 of ISO17987-4. As shown in Table 1, the duration of 6 μs affects the propagation delay of TXD, which is the output terminal of the microprocessor, and RXD, which is the feedback unit, because the delay degree of the input / output bus stage and the degree of the delayed slope affect the electromagnetic interference. .

FIG. 3 is a waveform diagram showing an output waveform of the tilt control circuit shown in FIG. 1; FIG.

As described above, the signal at the output terminal TXD of the microprocessor is output to the LIN BUS, but is fed back to the feedback signal input terminal RXD of the microprocessor.

Here, the delay detection unit 110 receives a signal fed back to the RXD terminal, which is a feedback input terminal of the microprocessor, and generates and outputs a delay signal DELAY according to the delay degree.

The switching signal generator 130 includes an n-bit counter and a shift register of a D flip-flop (DF / F) in series. 6 占 기간 period unit).

Accordingly, the delay detector 110 compares the delay signal DELAY according to the delay of the signal fed back to the RXD terminal, which is the feedback input terminal of the microprocessor, with the overflow clock output after 6 mu s.

When the overflow clock signal output after 6 mu s is compared with the delay signal DELAY so that the delay signal DELAY occurs after the overflow signal, the switching signal Q0 of the shift register is generated, And further outputs a setting signal. That is, in the D flip-flop, when the input delay signal exceeds the overflow clock signal generated after 6 μs, the output signal is transmitted to the shift register. The shift register adds the slope setting signal Q1 for sequentially turning on the switches and outputs the signals.

Thereafter, in the next cycle, the overflow clock signal output after 6 μs is compared with the delayed signal. If the delay signal occurs even after the overflow signal, the switching signal Q2 of the shift register is additionally generated.

That is, if the delay signal DELAY is maintained longer than 6 mu s, the DF / F connected shift register switch is turned ON by additionally generating the switching signal Q2, and if the delay signal DELAY exceeds 6 mu s in the next cycle, Another connected shift register switch is further turned on to further generate the switching signal Q3. If the delay signal DELAY is maintained for more than 6 [mu] s, the D-F / F-connected shift register switch can be further turned on to further generate the switching signal Q4.

If the switching signals Q0, Q1, Q2 and Q3 of the shift register are additionally generated every cycle, the output current amount becomes large, so that the output signal current amount of the LIN BUS becomes large and the delay degree and slope of the output signal of the LIN BUS are reduced . When the delay signal DELAY is disconnected before the overflow signal after the switching signal of the shift register is additionally generated every cycle, it is judged that the output signal of the LIN BUS is not delayed and the number of the switching signal output of the shift register is maintained So that the delayed output is prevented.

As described above, when it is determined that the delay degree or the delayed slope degree is delayed by more than the reference range, the switching signal generation unit 130 generates a delay confirmation signal including a delay detection result from the delay detection unit 110, . Thus, a slope setting signal is generated and output so that the delay of the slope control signal longer than the reference range of time or the degree of the slope of the slope can be readjusted within the preset 6 mu s period. To this end, the switching signal generator 130 automatically sets a setting value for resetting the degree of delay of the tilt control signal or the degree of the tilt of the tilt control signal corresponding to the delay confirmation signal including the degree of delay, A slope setting signal for resetting the slope to < RTI ID = 0.0 >

On the other hand, the tilt adjusting unit 140 adjusts the delay of the tilt control signal or the tilt of the tilt control signal according to the voltage value and the current amount corresponding to the tilt setting signal, and outputs the adjusted tilt. That is, the slope control unit 140 outputs a slope control signal having a voltage value and a current amount corresponding to the slope setting signal, respectively. The slope adjusting unit 140 adjusts the slope of the driving signal output unit 150, And generates and outputs a tilt control signal having a current amount.

The driving signal output unit 150 generates and outputs an output signal output to the external transceiver at a slope corresponding to the voltage value and current amount of the tilt control signal input from the tilt adjusting unit 140. In other words, according to the tilt control signal of the tilt adjusting unit 140, the voltage and speed of the voltage entering the driving switch gate are adjusted to generate and output an output signal having a slope corresponding to the voltage and current amount do.

Generally, the speed and current amount of the voltage entering the driving switch gate are adjusted in accordance with the tilt control signal in which the tilt is detected and read out in real time, and an output signal is generated and output so as to have a slope according to the voltage and current amount. At this time, if the slope is large, the output speed to the transceiver becomes faster, but the influence of noise (Electro Magnetic Interference) becomes relatively high. On the other hand, if the slope is small, the output speed to the transceiver is slow, but the influence of noise is relatively small. Accordingly, the slope of the tilt control signal is appropriately set and selected in accordance with the tilt range of the vehicle communication protocol.

As described above, according to the tilt control circuit of the vehicular communication transceiver and the tilt control method using the vehicle communication transceiver of the present invention, the delay of the output signal of the vehicular communication transceiver is detected through the degree of delay of the tilt control signal or the degree of the delayed tilt, It is possible to reduce the electromagnetic interference in the low slope control mode so that the control signals can be transmitted and received stably by controlling the delay of the slope control signal or the degree of the slope of the slope control signal so that the output signal is not delayed.

Also, it is possible to detect the delay of the output signal of the vehicular communication transceiver through the slope of the slope control signal, to correct the delay of the slope control signal or the slope of the slope, The circuit structure can be miniaturized by controlling the slope of the output terminal output signal of the module with a simpler and easier structure. Particularly, there is an effect that a chip size can be seen by reducing the number of input pads by reducing the number of pins when a chip is formed while simplifying a circuit structure.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the following claims And changes may be made without departing from the spirit and scope of the invention.

Claims

A delay detector for analyzing a slope control signal generated to control a slope of an output signal among the output signals fed back to the RXD stage to detect whether the delay signal is delayed;
A switching signal generator for generating a slope setting signal such that the slope of the slope control signal detected as the delay is reset within a predetermined period;
A tilt adjusting unit for adjusting and outputting the tilt of the tilt control signal according to a voltage value and a current amount corresponding to the tilt setting signal; And
A drive signal output unit for generating and outputting an output signal at a slope corresponding to the voltage value and the current amount of the readjusted tilt control signal;
The tilt control circuit of the vehicular communication transceiver.

The method according to claim 1,
The delay detector
Whether the delay of the feedback tilt control signal and the slope of the delayed waveform correspond to a predetermined period or a range within the preset period,
And outputs a delay confirmation signal when it is determined that the delay is longer than the reference range when the delay degree or the delayed inclination degree becomes longer than the predetermined period or the period within the predetermined period,
Wherein the predetermined period or the reference range is 6 占 퐏.

The method according to claim 1,
The switching signal generator
an n-bit counter, and a shift register of a D flip-flop type,
The n-bit counter outputs an overflow signal after a period of the clock x2 ^(n-1) from the time when the reset is started, and outputs a clock signal output after a predetermined period or a range within the preset period to a delayed signal And outputs the slope setting signal,
Wherein the D flip-flop receives the clock signal as a delay signal and outputs an output signal to the shift register when the delay signal exceeds the preset period or the predetermined period.

The method according to claim 1,
The tilt adjusting unit
A plurality of mirror circuits for performing a current mirror function and an inverter trimming circuit for driving gates of a drive switch constituted by MOSFETs to output a tilt control signal having a voltage value and a current amount corresponding to the tilt setting signal, The tilt control circuit of the vehicle communication transceiver.

The method according to claim 1,
The tilt adjusting unit
A plurality of PMOS FETs having different MOS sizes and a plurality of PMOS FETs connected in series according to at least one of a set signal and a tilt setting signal are output as a trimming signal A PMOS mirror circuit part composed of a plurality of first switches;
A plurality of NMOS FETs having different MOS sizes so as to perform a current mirror function opposite to the PMOS mirror circuit portion, and a plurality of NMOS FETs connected in series according to at least one of a tilt setting signal, An NMOS mirror circuit part composed of a plurality of second switches for outputting an output signal of one connected NMOS FET as a trimming signal;
An inverter trimming circuit for outputting a tilt control signal for driving the gate of the driving switch in accordance with a trimming signal of the PMOS mirror circuit and a trimming signal of the NMOS mirror circuit;
And outputs a tilt control signal having a voltage value and an amount of current corresponding to the tilt setting signal, respectively.

The method according to claim 1,
The driving signal output unit
And a drive switch formed of a MOSFET and implementing an open drain function,
And a tilt control signal is inputted to the gate terminal of the drive switch to generate and output an output signal having a slope in accordance with the voltage and current amount of the tilt control signal input to the gate of the drive switch.

Analyzing a slope control signal generated to control a slope of an output signal of an output signal fed back to the RXD stage using a delay detector to detect whether a delay exists;
Generating a slope setting signal so that the slope of the slope control signal detected by the delay signal can be readjusted within a predetermined period using the switching signal generator;
Adjusting and outputting the tilt of the tilt control signal according to a voltage value and a current amount corresponding to the tilt setting signal using a tilt adjusting unit; And
Generating and outputting an output signal at a slope corresponding to a voltage value and a current amount of the readjusted tilt control signal using a drive signal output unit;
Wherein the tilt control method comprises the steps of:

8. The method of claim 7,
The step of detecting whether the tilt control signal is delayed
Detecting whether a degree of delay of the feedback tilt control signal corresponds to a predetermined period or a range within the predetermined period; And
Outputting a delay confirmation signal when it is determined that the delay is longer than the reference range when the delay degree or the delayed inclination degree becomes longer than the predetermined period or the period within the predetermined period;
Wherein the tilt control method comprises the steps of:

8. The method of claim 7,
The step of generating the slope setting signal
^(n-1) of the clock from the time when the reset is started by using the n-bit counter, and outputs the clock signal outputted after the predetermined period or a range within the preset period to the delayed signal And outputs the tilt setting signal,
Wherein the clock signal is received as a delay signal by using the D flip-flop and the output signal is transmitted to the shift register when the delay signal exceeds a predetermined period or the predetermined period.

8. The method of claim 7,
The step of re-adjusting and outputting the slope of the tilt control signal
A slope control unit configured to include a plurality of mirror circuits for performing a current mirror function and an inverter trimming circuit for driving gates of a drive switch constituted by MOSFETs; a tilt control unit having a voltage value and an amount of current corresponding to the tilt setting signal, And outputting a signal indicative of the tilt of the vehicle.

8. The method of claim 7,
The step of generating and outputting the output signal
An output signal having a slope corresponding to the voltage and the current amount of the tilt control signal input to the gate of the drive switch is inputted to the gate terminal of the drive switch formed of a MOSFET and having an open drain function, Generating and outputting the tilt control signal.