WO2016203529A1 - データ通信システム、データ通信装置およびセンサ装置 - Google Patents
データ通信システム、データ通信装置およびセンサ装置 Download PDFInfo
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- WO2016203529A1 WO2016203529A1 PCT/JP2015/067201 JP2015067201W WO2016203529A1 WO 2016203529 A1 WO2016203529 A1 WO 2016203529A1 JP 2015067201 W JP2015067201 W JP 2015067201W WO 2016203529 A1 WO2016203529 A1 WO 2016203529A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/04—Generating or distributing clock signals or signals derived directly therefrom
- G06F1/10—Distribution of clock signals, e.g. skew
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/567—Circuits characterised by the use of more than one type of semiconductor device, e.g. BIMOS, composite devices such as IGBT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
- H04L25/40—Transmitting circuits; Receiving circuits
- H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/30—Arrangements in telecontrol or telemetry systems using a wired architecture
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2209/00—Arrangements in telecontrol or telemetry systems
- H04Q2209/70—Arrangements in the main station, i.e. central controller
Definitions
- This technology relates to a data communication system, a data communication device, and a sensor device.
- One-wire bidirectional data communication has a form in which a command is transmitted from the master side to the slave side through one communication line, and a command response is returned from the slave side to the master side.
- a command is transmitted from a test device corresponding to the master side, and a response returned from the slave side is received by the master side to check the product quality. It is used for quality testing at the time of product shipment.
- Examples of conventional one-line two-way communication technology include a technology for performing communication by performing A / D and D / A conversion (Patent Document 1), and a technology for performing communication by determining a logic level based on time measurement. It has been proposed (Patent Document 2). Further, the first device transmits the clock to the second device by repeating the first level and the intermediate level, and the second device indicates whether or not the second device outputs the second level during the intermediate level period of the clock. Has been proposed (Patent Document 3).
- Patent Document 1 A / D and D / A converters are built in, and in Patent Document 2, a timer circuit for measuring time is added, so that the circuit scale is large. It will increase.
- the present invention has been made in view of these points, and an object of the present invention is to provide a data communication system, a data communication apparatus, and a sensor apparatus that reduce the circuit scale and efficiently perform one-wire bidirectional data communication.
- a data communication system includes a master-side data communication device that performs bidirectional communication with a slave side via a single communication line, and a slave-side data communication that performs bidirectional communication with a master-side data communication device via a communication line. Device.
- the master-side data communication device includes an input clock-side transistor, first, second, and third transistors, a master-side resistor, a connection cutoff circuit, and a master-side data recovery circuit.
- the input clock side transistor is connected between the reference potential and the communication line, and is switched by the input clock.
- the first transistor is connected between the first potential and the communication line.
- One end of the second transistor is connected to a second potential lower than the first potential.
- the third transistor has one end connected to the second potential.
- the master-side resistor is connected between the other end of the second transistor and the other end of the third transistor.
- the connection cut-off circuit cuts off the electrical connection between the second and third transistors and the communication line according to the switching state of the first transistor.
- the master side data reproduction circuit reproduces data transmitted from the slave side data communication device via the communication line.
- the slave-side data communication device includes a fourth transistor, a slave-side resistor, a clock recovery circuit, and a slave-side data recovery circuit.
- the fourth transistor is connected between the communication line and a third potential that is equal to or higher than the first potential.
- the slave-side resistor is connected between the communication line and the reference potential.
- the clock recovery circuit recovers the clock transmitted from the master side data communication device via the communication line.
- the slave-side data reproduction circuit reproduces data transmitted from the master-side data communication device via the communication line.
- a data communication device that performs bidirectional communication with the slave side via a single communication line.
- the data communication device includes an input clock side transistor, first, second, and third transistors, a master side resistor, a connection cutoff circuit, and a master side data recovery circuit.
- the input clock side transistor is connected between the reference potential and the communication line and is switched by the input clock.
- the first transistor is connected between the first potential and the communication line.
- One end of the second transistor is connected to a second potential lower than the first potential.
- the third transistor has one end connected to the second potential.
- the master-side resistor is connected between the other end of the second transistor and the other end of the third transistor.
- the connection cut-off circuit cuts off the electrical connection between the second and third transistors and the communication line according to the switching state of the first transistor.
- the master side data reproduction circuit reproduces data transmitted from the slave side via the communication line.
- the data communication apparatus includes a transistor, a slave side resistor, a clock recovery circuit, and a slave side data recovery circuit.
- the transistor is connected between a slave side potential equal to or higher than the master side potential supplied to the master side and the communication line.
- the slave-side resistor is connected between the communication line and the reference potential.
- the clock recovery circuit recovers the clock transmitted from the master side via the communication line.
- the slave side data reproduction circuit reproduces data transmitted from the master side via the communication line.
- a sensor device that performs two-way communication with the master side via a single communication line to detect a physical quantity.
- the sensor device includes an interface circuit, a sensor element, an amplifier circuit, an auxiliary memory, a main memory, an adjustment circuit, and a control circuit.
- the interface circuit includes a slave-side potential that is equal to or higher than the master-side potential supplied to the master side, a transistor connected between the communication line, one communication line and a reference potential.
- a slave side resistor connected to the clock, a clock recovery circuit for recovering a clock transmitted from the master side via the communication line, and a slave side data recovery circuit for recovering data transmitted from the master side via the communication line And communicate with the master side via a communication line.
- the sensor element generates an electrical signal corresponding to the detected physical quantity.
- the amplifier circuit amplifies the electric signal.
- the auxiliary memory temporarily stores the input trimming data.
- the main memory stores the trimming data stored in the auxiliary memory by an electrical writing operation.
- the adjustment circuit adjusts the output characteristics of the sensor element based on the trimming data stored in the auxiliary memory or the trimming data stored in the main memory.
- the control circuit determines the control mode of the main memory.
- a single output terminal that outputs the electrical signal amplified by the amplifier circuit to the outside, and a trimming clock to determine the trimming data to be written to the main memory
- data input / output A single input / output interface terminal connected to the communication line, and a plurality of voltage application terminals required for voltage application when data is written to the main memory.
- FIG. 1 is a diagram illustrating a configuration example of a data communication system.
- the data communication system 1 includes a master-side data communication device 1a and a slave-side data communication device 1b.
- terminal DIO of the master side data communication device 1a and the terminal OW of the slave side data communication device 1b are connected by a one-line communication line L1, and the master side data communication device 1a and the slave side data communication device 1b are connected. Bidirectional communication is performed via the communication line L1.
- the master side data communication device 1a includes an NMOS (N channel MetalOxide Semiconductor) transistor MN1, PMOS (P channel MOS) transistors MP1 to MP3, a resistor R1 (master side resistor), an inverter Inv1, a connection cutoff circuit 1a-1 and a master side.
- a data reproduction circuit 1a-2 is included.
- the NMOS transistor MN1 corresponds to an input clock side transistor, and the PMOS transistors MP1 to MP3 correspond to first to third transistors, respectively.
- the NMOS transistor MN1 is connected between the reference potential (GND) and the communication line L1, and is switched by the clock ck.
- the PMOS transistor MP1 is connected between 5V (first potential) and the communication line L1.
- One end (source) of the PMOS transistor MP2 is connected to 3.3 V (second potential lower than the first potential).
- One end (source) of the PMOS transistor MP3 is connected to 3.3V.
- the resistor R1 is connected between the other end (drain) of the PMOS transistor MP2 and the other end (drain) of the PMOS transistor MP3.
- the connection cut-off circuit 1a-1 cuts off the electrical connection between the PMOS transistors MP2 and MP3 and the communication line L1 according to the switching state of the PMOS transistor MP1.
- the master side data reproduction circuit 1a-2 reproduces data transmitted from the slave side data communication device 1b via the communication line L1.
- the slave side data communication device 1b includes a PMOS transistor MP4, a resistor R2 (slave side resistor), a clock recovery circuit 1b-1, and a slave side data recovery circuit 1b-2.
- the PMOS transistor MP4 corresponds to a fourth transistor.
- the PMOS transistor MP4 is connected between 5V (third potential) and the communication line L1.
- the third potential supplied to the slave-side data communication device 1b is equal to or higher than the first potential of the master-side data communication device 1a.
- the third potential is equivalent to the first potential (5V). An example is shown.
- the resistor R2 is connected between the communication line L1 and GND.
- the clock recovery circuit 1b-1 reproduces and outputs the clock transmitted from the master data communication device 1a via the communication line L1.
- the slave side data reproduction circuit 1b-2 reproduces and outputs the data transmitted from the master side data communication device 1a via the communication line L1.
- the NMOS transistor MN1 turns on when the clock ck input to the inverter Inv1 is at a low potential level (L level), and sets the potential on the communication line L1 to GND.
- the PMOS transistor MP1 When data is written from the master side to the slave side, the PMOS transistor MP1 is turned on by the first condition signal r1 that becomes L level when the data, the master side enable signal, and the clock ck become high potential level (H level).
- the potential on the communication line L1 is set to 5V.
- the PMOS transistor MP2 When data is written from the master side to the slave side, the PMOS transistor MP2 is turned on by the second condition signal r2 that becomes L level when the data becomes L level and the master side enable signal and the clock ck become H level.
- the potential on the communication line L1 is set to 3.3V.
- the PMOS transistor MP3 When reading data from the master side to the slave side, the PMOS transistor MP3 is turned on by the third condition signal r3 that becomes L level when the master side enable signal becomes L level, and the communication line L1 is set to 3 via the resistor R1. 3. Pull up to 3V.
- the PMOS transistor MP4 is a fourth condition in which when the master side reads data transmitted from the slave side, the data and the slave side enable signal and the clock reproduced by the clock reproduction circuit 1b-1 become the L level when the clock is reproduced. Turned on by the signal r4, the potential on the communication line L1 is set to 5V.
- FIG. 2 is a diagram illustrating a configuration example of a data communication system.
- the data communication system 1-1 includes a master-side data communication device 10m and a slave-side data communication device 10s, and the master-side data communication device 10m and the slave-side data communication device 10s are connected by a single communication line L1. is doing.
- the master-side data communication device 10m operates with a plurality of power supplies. In the example of FIG. 2, 5V and 3.3V are operating power supplies.
- the slave-side data communication device 10s operates with a single power source, and in the example of FIG. 2, a single 5V is the operating power source (a voltage higher than 5V may be used).
- the GND of the master side data communication device 10m and the slave side data communication device 10s is common.
- the master-side data communication device 10m corresponds to, for example, a test device (tester) that tests the slave-side data communication device 10s, and the slave-side data communication device 10s is a product to be tested by the master-side data communication device 10m (for example, , IC (Integrated Circuit)).
- tester test device
- IC Integrated Circuit
- both the master side data communication device 10m and the slave side data communication device 10s are communication interface circuits, and are provided with a control circuit at the upper level in order to perform such a test function (FIG. 10 to FIG. 10). (Described later in FIG. 13).
- the master-side data communication device 10m has a terminal DO, a terminal DE, a terminal CLK, a terminal DI, and a terminal DIO.
- Terminal DO, terminal DE, terminal CLK, and terminal DI are internal terminals
- terminal DIO is an external terminal.
- the terminal DO is a terminal for inputting data (such as a test command and write data) to be transmitted from the master side to the slave side
- the terminal DE is a terminal for inputting an enable signal on the master side.
- the terminal CLK is a terminal for inputting a clock.
- the terminal DI is a terminal that outputs data transmitted from the slave side data communication device 10s, or a terminal that feeds back and outputs data transmitted from the master side data communication device 10m.
- the terminal DIO is an input / output interface terminal for connecting to one end of the communication line L1 and communicating with the slave side data communication device 10s.
- the master-side data communication device 10m includes logic elements Ic1 and Ic2, inverters Inv0 and Inv1, a resistor R1, an NMOS transistor MN1, PMOS transistors MP0 to MP3, a comparator Cmp1, and a reference voltage source Vr1 as constituent elements.
- the comparator Cmp1 and the reference voltage source Vr1 realize the function of the master side data recovery circuit 1a-2 in FIG. 1, and the inverter Inv0 and the PMOS transistor MP0 realize the function of the connection cutoff circuit 1a-1 in FIG. (The connection cutoff circuit 1a-1 will be described later with reference to FIGS. 6 to 8).
- the logic element Ic1 outputs an L level when the three inputs to the input terminals a4 to a6 are at an H level input condition (this output corresponds to the first condition signal r1), and other input conditions.
- the logic element Ic2 outputs when one input to the input terminal a1 is L level and two inputs to the input terminals a2 and a3 are H level (this output corresponds to the second condition signal r2). ) Is at the L level, and the output is at the H level when the input condition is other than that, the logic operation circuit has three inputs and one output. Note that the enable signal input from the terminal DE corresponds to the third condition signal r3.
- the terminal DO is connected to the input terminal a1 of the logic element Ic2 and the input terminal a4 of the logic element Ic1.
- the terminal DE is connected to the input terminal a2 of the logic element Ic2, the input terminal a5 of the logic element Ic1, and the gate of the PMOS transistor MP3.
- the terminal CLK is connected to the input terminal a3 of the logic element Ic2, the input terminal a6 of the logic element Ic1, and the input terminal of the inverter Inv1.
- the terminal DI is connected to the output terminal of the comparator Cmp1.
- the output terminal of the logic element Ic2 is connected to the gate of the PMOS transistor MP2, and the output terminal of the logic element Ic1 is connected to the gate of the PMOS transistor MP1 and the input terminal of the inverter Inv0.
- the source of the PMOS transistor MP1 is connected to a 5V power source.
- the drain of the PMOS transistor MP1 is connected to the drain of the NMOS transistor MN1, the positive input terminal of the comparator Cmp1, the drain of the PMOS transistor MP0, and the terminal DIO.
- the gate of the NMOS transistor MN1 is connected to the output terminal of the inverter Inv1, and the source of the NMOS transistor MN1 is connected to GND.
- the negative input terminal of the comparator Cmp1 is connected to the positive terminal of the reference voltage source Vr1, and the negative terminal of the reference voltage source Vr1 is connected to GND.
- the source of the PMOS transistor MP3 is connected to the 3.3V power source and the source of the PMOS transistor MP2, and the drain of the PMOS transistor MP3 is connected to one end of the resistor R1.
- the drain of the PMOS transistor MP2 is connected to the other end of the resistor R1 and the source of the PMOS transistor MP0, and the gate of the PMOS transistor MP0 is connected to the output terminal of the inverter Inv0.
- the comparator Cmp1 when the level of the input signal to the positive input terminal of the comparator Cmp1 is 4.2 V or higher, the comparator Cmp1 outputs an H level (5 V) signal. Further, when the level of the input signal to the positive input terminal of the comparator Cmp1 is less than 4.2V, an L level (GND) signal is output.
- the slave-side data communication device 10s has a terminal ICDH, a terminal ICDE, a terminal ICCLK, a terminal ICDI, and a terminal OW (one wire).
- the terminal ICDH, the terminal ICDE, the terminal ICCLK, and the terminal ICDI are internal terminals, and the terminal OW is an external terminal.
- the terminal ICDH is a terminal for inputting data (such as a response to a command) to be transmitted from the slave side to the master side
- the terminal ICDE is a terminal for inputting an enable signal on the slave side.
- the terminal ICCLK is a terminal for outputting a reproduction clock.
- the terminal ICDI is a terminal from which data transmitted from the master side data communication device 10m is output, or a terminal from which data transmitted from the slave side data communication device 10s is fed back and output.
- the terminal OW is an input / output interface terminal for connecting to the other end of the communication line L1 and communicating with the master side data communication device 10m.
- the slave-side data communication device 10s includes a logic element Ic3, a buffer Ic4, a resistor R2, a PMOS transistor MP4, a comparator Cmp2, and a reference voltage source Vr2 as constituent elements.
- comparator Cmp2 and the reference voltage source Vr2 realize the function of the slave-side data recovery circuit 1b-2 in FIG. 1
- the buffer Ic4 realizes the function of the clock recovery circuit 1b-1 in FIG.
- the logic element Ic3 outputs an L level when the three inputs to the input terminals b1 to b3 are at an H level input condition (this output corresponds to the fourth condition signal r4), and other input conditions.
- the relationship between the resistance values of the resistor R1 provided in the master-side data communication device 10m and the resistor R2 provided in the slave-side data communication device 10s is R1 ⁇ R2.
- the connection relationship of each element in the slave-side data communication device 10s will be described.
- the terminal ICDH is connected to the input terminal b1 of the logic element Ic3, and the terminal ICDE is connected to the input terminal b2 of the logic element Ic3.
- the terminal ICCLK is connected to the input terminal b3 of the logic element Ic3 and the output terminal of the buffer Ic4.
- the terminal ICDI is connected to the output terminal of the comparator Cmp2.
- the gate of the PMOS transistor MP4 is connected to the output terminal of the logic element Ic3, and the source of the PMOS transistor MP4 is connected to the 5V power source.
- the drain of the PMOS transistor MP4 is connected to the terminal OW, one end of the resistor R2, the input end of the buffer Ic4, and the positive side input end of the comparator Cmp2.
- the other end of the resistor R2 is connected to GND, the negative input terminal of the comparator Cmp2 is connected to the positive terminal of the reference voltage source Vr2, and the negative terminal of the reference voltage source Vr2 is connected to GND.
- the reference voltage source Vr2 connected to the negative side input terminal of the comparator Cmp2 generates an intermediate potential ( ⁇ 4.2V) between 5V (third potential) and 3.3V (second potential). It shall be.
- the comparator Cmp2 when the level of the input signal to the positive side input terminal of the comparator Cmp2 is 4.2 V or higher of the reference voltage, the comparator Cmp2 outputs an H level (5 V) signal. Further, when the level of the input signal to the positive input terminal of the comparator Cmp2 is less than the reference voltage of 4.2 V, an L level (GND) signal is output.
- FIG. 3 is a diagram illustrating a waveform of a transmission signal.
- the master-side data communication device 10m generates a serial communication signal w1 obtained by synthesizing the clock and data, and transmits it through the communication line L1.
- the serial communication signal w1 has three levels of 5V, 3.3V, and GND.
- the slave-side data communication device 10s When the slave-side data communication device 10s receives the serial communication signal w1 transmitted from the master-side data communication device 10m, the slave-side data communication device 10s reproduces the clock and data.
- the H level of the clock is reproduced from the 5V level or the 3.3V level of the serial communication signal w1
- the L level of the clock corresponds to the GND of the serial communication signal w1.
- the H level of data is reproduced from the 5V level of the serial communication signal w1, and the L level of data corresponds to the 3.3V level or GND of the serial communication signal w1.
- FIG. 4 is a diagram showing operation waveforms in the write mode.
- the clock input to the terminal CLK is clock ckm
- the data input to the terminal DO is data dm1
- the master side enable signal input to the terminal DE is the enable signal e1.
- the reproduced clock output from the terminal ICCLK be the clock cks
- the reproduced data output from the terminal ICDI be the data ds1
- the slave enable signal input to the terminal ICDE be the enable signal e2.
- the enable signal e1 on the master side is at H level and the enable signal e2 on the slave side is at L level.
- the NMOS transistor MN1 is turned on. Therefore, since the terminal DIO is connected to GND, the serial communication signal w1 flowing through the communication line L1 becomes GND regardless of the level of the data dm1 to be transmitted.
- the input of the buffer Ic4 becomes GND
- the clock cks output from the buffer Ic4 becomes L level (GND).
- the buffer Ic4 is a CMOS (Complementary MOS) element, and the operation threshold voltage is about 2.5V. Therefore, if a voltage lower than 2.5V is input, the output level of the buffer Ic4 becomes GND.
- CMOS Complementary MOS
- the comparator Cmp2 since the positive input terminal of the comparator Cmp2 becomes GND and is lower than the reference voltage 4.2V of the negative input terminal, the comparator Cmp2 outputs L level data ds1.
- the clock ckm is H level
- the data dm1 is H level
- the enable signal e1 is H level
- the enable signal e2 of the slave side data communication device 10s is L It is level.
- the input of the buffer Ic4 becomes 5V
- the clock cks output from the buffer Ic4 becomes the H level (5V).
- the operation threshold voltage of the buffer Ic4 is about 2.5V, if a voltage exceeding 2.5V is input, the output level of the buffer Ic4 becomes 5V of the operation power supply.
- the comparator Cmp2 since the positive side input terminal of the comparator Cmp2 becomes 5V and is higher than the reference voltage 4.2V at the negative side input terminal, the comparator Cmp2 outputs H level data ds1. Note that the H level is output after the transmission delay time ⁇ t.
- the clock ckm is H level
- the data dm1 is L level
- the enable signal e1 is H level
- the enable signal e2 of the slave side data communication device 10s is L It is level.
- the terminal OW becomes 3.3V
- the input of the buffer Ic4 becomes 3.3V
- the clock cks output from the buffer Ic4 becomes H level (5V).
- the operation threshold voltage of the buffer Ic4 is about 2.5V, if a voltage exceeding 2.5V is input as described above, the output level of the buffer Ic4 becomes 5V of the operation power supply.
- the comparator Cmp2 since the positive side input terminal of the comparator Cmp2 becomes 3.3V and is lower than the reference voltage 4.2V of the negative side input terminal, the comparator Cmp2 outputs L level data ds1.
- the master-side clock is regenerated on the slave side, and the H-level data on the master-side is written to the slave side in approximately time zones t2 and t6.
- FIG. 5 is a diagram showing operation waveforms in the read mode. As different from the waveform shown in FIG. 4, data output from the terminal DI is data dm2, and data input to the terminal ICDH is data ds2. The data dm1 input from the terminal DO is not shown because it is don't care (it can be either H level or L level).
- the enable signal e1 on the master side is at L level and the enable signal e2 on the slave side is at H level.
- the NMOS transistor MN1 is turned on. Therefore, since the terminal DIO is connected to GND, the serial communication signal w1 is at the GND level.
- the input of the buffer Ic4 becomes GND and is lower than the operation threshold voltage of the buffer Ic4, so that the clock cks output from the buffer Ic4 becomes L level.
- the comparator Cmp1 since the positive side input terminal of the comparator Cmp1 becomes GND and is lower than the reference voltage 4.2V at the negative side input terminal, the comparator Cmp1 outputs L level data dm2.
- the clock ckm is at the H level and the enable signal e1 is at the L level.
- the data ds2 is at the L level and the enable signal e2 is H level.
- the input of the buffer Ic4 is 3.3V, which is higher than the operation threshold voltage of the buffer Ic4, so the clock cks is at the 5V level.
- the positive side input terminal of the comparator Cmp1 is 3.3V, which is lower than the reference voltage 4.2V of the negative side input terminal, so the comparator Cmp1 outputs L level data dm2. .
- the clock ckm is at the H level and the enable signal e1 is at the L level.
- the data ds2 is at the H level and the enable signal e2 is H level.
- the input voltage of the buffer Ic4 is higher than the operation threshold voltage of the buffer Ic4, and the clock cks becomes 5V level. Then, the switching state of the PMOS transistor MP4 on the slave side is turned on, and the terminal OW is connected to the 5V power supply on the slave side, so that the serial communication signal w1 is at the 5V level.
- the positive side input terminal of the comparator Cmp1 is 5V, which is higher than the reference voltage 4.2V of the negative side input terminal, so the comparator Cmp1 outputs H level data dm2.
- the master side clock is reproduced on the slave side, and the H level of the slave side data is read on the master side in the time zones t16 and t18. I understand that.
- the master-side data communication device 10m of the data communication system 1-1 has a circuit configuration that suppresses a leak current that may flow from the PMOS transistors MP2 and MP3.
- FIG. 6 is a diagram showing a circuit configuration in which a leak current is generated.
- the data communication system 100 includes a master-side data communication device 100m and a slave-side data communication device 10s.
- the master-side data communication device 100m has a configuration that does not include the inverter Inv0 and the PMOS transistor MP0 shown in FIG. For this reason, the drain of the PMOS transistor MP2 and the other end of the resistor R1 are directly connected to the terminal DIO. Other configurations are the same as those in FIG.
- the master-side data communication device is configured as the master-side data communication device 100m as shown in FIG. 6, there is a problem that leakage currents are generated by the PMOS transistors MP2 and MP3.
- FIG. 7 is a diagram for explaining the cause of leakage current.
- the cross-sectional structure of the PMOS transistors MP2 and MP3 is shown.
- the communication line L1 is set to 5V.
- the drain-side potential of the PMOS transistor MP2 becomes higher than 3.3V.
- the drain side potential of the PMOS transistor MP3 also becomes higher than 3.3 V via the resistor R1.
- a current flows in the direction of the arrow as shown in FIG. 7 through the body diodes (parasitic diodes) Db of the PMOS transistors MP2 and MP3, and the signal voltage of the communication line L1 does not reach 5V. End up.
- an inverter Inv0 and a PMOS transistor MP0 are added as the connection cutoff circuit 1a-1.
- the gate of the PMOS transistor MP1 is connected to the input of the inverter Inv0, and the output of the inverter Inv0 is connected to the gate of the PMOS transistor MP0.
- the source of the PMOS transistor MP0 is connected to the drain of the PMOS transistor MP2 and the other end of the resistor R1.
- the drain of the PMOS transistor MP0 is connected to the terminal DIO, the drain of the PMOS transistor MP1, the drain of the NMOS transistor MN1, and the positive input terminal of the comparator Cmp1.
- the body diode Db of the PMOS transistors MP2 and MP3 is not turned on, so that no leakage current is generated, and the communication line L1 is normally maintained at 5V. (However, the back gate voltage of the PMOS transistor MP0 is 5V).
- the inverter Inv0 and the PMOS transistor MP0 are used to suppress the generation of leakage current.
- a diode can be used to obtain the same effect.
- the modification is a case of a circuit configuration using a diode.
- FIG. 8 is a diagram showing a circuit configuration of a modified example having a leakage current suppressing function.
- the data communication system 1-2 includes a master-side data communication device 10m-1 and a slave-side data communication device 10s.
- the master-side data communication device 10m-1 does not include the inverter Inv0 and the PMOS transistor MP0 shown in FIG. 2, but instead uses a diode Di (forward voltage Vf is, for example, 0 as the connection cutoff circuit 1a-1). .7V).
- the anode of the diode Di is connected to the drain of the PMOS transistor MP2 and the other end of the resistor R1.
- the cathode of the diode Di is connected to the drain of the PMOS transistor MP1, the drain of the NMOS transistor MN1, the positive input terminal of the comparator Cmp1, and the terminal DIO.
- the sources of the PMOS transistors MP2 and MP3 are connected to a 4V power source. Other configurations are the same as those in FIG.
- the diode Di is forward biased, and a voltage drop of the forward voltage Vf (in this example, 0.7 V) occurs.
- Vf the forward voltage
- the source voltages of the PMOS transistors MP2 and MP3 are set 0.7V higher than 3.3V and used at 4.0V.
- FIG. 9 is a diagram illustrating a configuration example of a data communication system.
- the data communication system 1-3 includes a master-side data communication device 10m and a slave-side data communication device 10s-1.
- the slave-side data communication device 10s-1 includes a terminal ALM for inputting a signal for notifying a slave abnormality (temperature abnormality, power supply voltage abnormality, etc.) as a new terminal. Further, the slave side data communication device 10s-1 does not include the logic element Ic3 shown in FIG. 2, but instead includes the logic elements Ic5 and Ic6 and the inverter Inv2.
- the logic element Ic5 has an output of L level when the three inputs to the input terminals b4 to b6 are at an H level input condition, and the output of the logic element Ic5 is at an H level at other input conditions. It is a logic operation circuit.
- the logic element Ic6 is a two-input one-output logic operation circuit in which the output is at the L level if one of the two inputs is at the L level, and the output is at the H level when both of the two inputs are at the H level. (Equivalent to a 2-input 1-output AND element).
- the terminal ALM is connected to the input terminal of the inverter Inv2.
- the terminal ICDH is connected to the input terminal b4 of the logic element Ic5
- the terminal ICDE is connected to the input terminal b5 of the logic element Ic5
- the terminal ICCLK is connected to the input terminal b6 of the logic element Ic5 and the output terminal of the buffer Ic4. ing.
- the output terminal of the inverter Inv2 is connected to one input terminal of the logic element Ic6, and the output terminal of the logic element Ic5 is connected to the other input terminal of the logic element Ic6.
- the output terminal of the logic element Ic6 is connected to the gate of the PMOS transistor MP4. Other configurations are the same as those in FIG.
- the alarm signal dalm transmitted from the control circuit of the slave side data communication device 10s-1 is input to the terminal ALM, and when an abnormality occurs on the slave side, the alarm signal dalm becomes H level.
- the PMOS transistor MP4 is turned on when the alarm signal becomes H level regardless of the level of the terminal ICDH and the terminal ICDE, and the communication line L1 is in the 5V state.
- the master-side data communication device 10m can quickly recognize the abnormal state on the slave side.
- FIG. 10 is a diagram illustrating a system configuration example.
- the data communication system 2-1 includes a master device 20a and a slave device 30a, and the master device 20a and the slave device 30a are connected by a communication line L1.
- the master side device 20a includes a master side control circuit 22a and a master side interface circuit 21a corresponding to the master side data communication device 10m.
- the master side interface circuit 21a includes terminals DO, DE, CLK, and DI.
- the master-side control circuit 22a transmits data dm1 to the terminal DO, transmits an enable signal e1 to the terminal DE, and transmits a clock ckm to the terminal CLK.
- the master side interface circuit 21a transmits data dm2 from the terminal DI toward the master side control circuit 22a.
- the slave side device 30a includes a slave side control circuit 32a and a slave side interface circuit 31a corresponding to the slave side data communication device 10s.
- the slave side interface circuit 31a includes terminals ICDH, ICDE, ICCLK, and ICDI.
- the slave-side control circuit 32a transmits data ds2 to the terminal ICDH and transmits an enable signal e2 to the terminal ICDE.
- the slave side interface circuit 31a transmits the clock cks from the terminal ICCLK and the data ds1 from the terminal ICDI toward the slave side control circuit 32a.
- FIG. 11 is a diagram showing another system configuration example.
- a multi-wiring type system configuration example in which a plurality of slave devices are connected to one communication line is shown.
- the data communication system 2-2 includes a master side device 20a and slave side devices 30a-1 to 30a-n, and the master side device 20a and slave side devices 30a-1 to 30a-n are connected by a communication line L1a. Is done.
- the communication line L1a has a multi-wiring configuration on the slave side.
- the slave side device 30a-1 includes a slave side interface circuit 31a-1 and a slave side control circuit 32a-1.
- the slave side device 30a-n includes a slave side interface circuit 31a-n and a slave side control circuit 32a-n.
- the connection relationship between the control circuit side and the interface circuit side is the same as in FIG.
- FIG. 12 is a diagram showing still another system configuration example. 2 shows a system configuration example in the case of having an alarm notification function.
- the data communication system 2-3 includes a master device 20a and a slave device 30b, and the master device 20a and the slave device 30b are connected by a communication line L1.
- the slave side device 30b includes a slave side interface circuit 31b and a slave side control circuit 32b.
- the slave side interface circuit 31b further includes a terminal ALM in addition to the terminals ICDH, ICDE, ICCLK, and ICDI.
- FIG. 13 is a diagram showing still another system configuration example. An example of a system configuration in which the master side is replaced with a microcomputer is shown.
- the data communication system 2-4 includes a microcomputer 20b and a slave device 30c, and the microcomputer 20b and the slave device 30c are connected by a communication line L1. Other configurations are the same as those in FIG.
- the master side device is a tester and the slave side device is an IC, for example, as shown in FIG.
- mass production tests can be performed efficiently.
- the communication line L1 is used as a line for notifying abnormality detection.
- FIG. 14 is a diagram showing a communication format.
- (A) shows the case of the communication format f1 having only the N-bit command cm1.
- the communication format f1 is used.
- the master-side data communication device 10m transmits a command cm1 instructing reset to the slave side, and the slave-side data communication device 10s resets when receiving the command cm1. Execute.
- (B) shows a case of a communication format f2 including an N-bit command cm1 and an M-bit command processing payload cm2.
- the communication format f2 is used when the master-side data communication device 10m performs writing / reading of data requiring data exchange with respect to the slave-side data communication device 10s.
- the master-side data communication device 10m When performing data writing, the master-side data communication device 10m transmits a command cm1 for instructing data writing and a command processing payload cm2 into which data to be written is inserted, to the slave-side data communication device 10s.
- the master-side data communication device 10m transmits a command cm1 for instructing data reading to the slave side.
- the slave-side data communication device 10s receives the command cm1, the master-side data communication device 10s is based on the instruction of the command cm1.
- the read data is inserted into the command processing payload cm2 and returned.
- FIG. 15 is a diagram showing another communication format.
- A shows a case of a communication format f1a including an N-bit command cm1 and a K-bit address ad1.
- B shows a case of a communication format f2a including an N-bit command cm1, an M-bit command processing payload cm2, and a K-bit address ad1.
- Such communication formats f1a and f2a are applied to the data communication system 2-2 shown in FIG. 11, and the address ad1 includes the address values (slave side devices 30a-1 to 30a-n) ( Or the address values of the slave side interface circuits 31a-1 to 31a-n) are set.
- FIG. 16 is a diagram showing state transition. A state transition in the case where communication is performed between the master and the slave by the communication format having no field of the address ad1 is shown.
- FIG. 17 is a diagram showing another state transition. The state transition in the case where communication is performed between the master and the slave by the communication format having the field of the address ad1 is shown.
- the slave side device whose address is not its own transits to an operation waiting state (IDLE). Further, when the command is, for example, software reset, the slave side device having the corresponding address is reset and transits to an operation waiting state (IDLE).
- the address communication state (ADR) also has a processing time determined in advance by the number of clocks, and the control circuit on the master side and the slave side performs the clock counting process, and the address communication state (ADR) The timing at the time of transition from the process to be performed to another state is detected.
- the configuration of the data communication system of the present invention makes it possible to efficiently perform one-wire bidirectional data communication with a small circuit scale.
- the configuration of FIG. 2 described in Patent Document 3 described above since the H level transmission from the slave to the master cannot be performed, the power state on the slave side cannot be recognized.
- the slave-side data communication device 10s when the slave-side data communication device 10s is operating normally, the slave-side data communication device 10s can transmit the H level to the master-side data communication device 10m. Conversely, when the power of the slave-side data communication device 10s is turned off or the operating voltage is lowered, the H level is not transmitted (only the output at the GND level is provided).
- the slave-side data communication device 10s determines whether or not the slave-side data communication device 10s can transmit the H level, and checks the transmitted H-level voltage value. It becomes possible to recognize the power state of (or the slave side device).
- the slave side device will be described in detail.
- the slave side device will be described as a sensor device, for example, assuming that it is a sensor that detects physical quantities such as temperature and pressure.
- FIG. 18 is a diagram showing a configuration example of the sensor device.
- the sensor device 30 includes a slave interface circuit 31, a control circuit 32, an auxiliary memory 33, a main memory 34, an adjustment circuit 35, a sensor element 36, an amplification circuit 37, and an abnormality detection unit 38.
- the terminals include a terminal OW, a terminal Vout, a terminal EV, and a terminal CG.
- the sensor device 30 is composed only of active elements and passive elements formed on the same semiconductor chip and manufactured by a CMOS process.
- the terminal OW is an input / output interface terminal that is connected to the communication line L1 and communicates with the master-side data communication device 10m.
- a combined signal of data and clock is input / output to / from the terminal OW.
- the terminal Vout is a terminal that outputs a result detected by the sensor element 36.
- the terminals EV and CG are voltage application terminals used when writing data into the main memory 34.
- the main memory 34 is an EPROM (Erasable Programmable Read Only Memory) configured with a floating MOS array.
- the slave interface circuit 31 corresponds to the above-described slave-side data communication device 10s, and communicates with the master-side device via the communication line L1 connected to the terminal OW.
- the control circuit 32 corresponds to the slave-side control circuit described above with reference to FIGS.
- the auxiliary memory 33 temporarily stores data (trimming data) input from the terminal OW.
- the auxiliary memory 33 is composed of a shift register, for example, a 48-bit shift register.
- the main memory 34 is an EPROM, and stores trimming data stored in the auxiliary memory 33 by an electrical rewriting operation (hereinafter, the main memory 34 is referred to as an EPROM 34).
- the adjustment circuit 35 adjusts the output characteristics (sensitivity) of the sensor element 36 based on the trimming data stored in the auxiliary memory 33 or the trimming data stored in the EPROM 34. Alternatively, the offset and gain of the amplifier circuit 37 are adjusted.
- the sensor element 36 generates an electrical signal corresponding to the detected physical quantity.
- the amplifier circuit 37 amplifies the electrical signal output from the sensor element 36 and outputs the amplified signal to the outside through the terminal Vout.
- the abnormality detection unit 38 detects an abnormality that has occurred in the sensor device 30 and transmits an alarm signal to the slave interface circuit 31.
- the auxiliary memory 33 receives and stores the temporary trimming data transmitted from the terminal OW through the slave interface circuit 31 and the control circuit 32.
- the adjustment circuit 35 uses the temporary trimming data stored in the auxiliary memory 33 to adjust the output characteristics of the sensor element 36 or the offset and gain of the amplifier circuit 37.
- control circuit 32 causes the adjustment circuit 35 to measure the output of the sensor element 36 or the output of the amplifier circuit 37 while changing the trimming value using a plurality of temporary trimming data, and to obtain a desired output.
- the trimming data from which the value is obtained is determined.
- the control circuit 32 stores the trimming data in the EPROM 34.
- the trimming data stored in the EPROM 34 is used to adjust the outputs of the sensor element 36 and the amplifier circuit 37 by the adjustment circuit 35.
- the control circuit 32 includes a 3-bit command register (mode setting register), and the 3-bit command register analyzes a 3-bit command transmitted from the master side at a predetermined number of clocks.
- FIG. 19 is a diagram showing an example of the function of the 3-bit command register.
- Table T1 shows the function of the 3-bit command register value.
- No. 2, no. 6, no. 7 is empty.
- control circuit 32 when the name is “adjustment” and a command of “011” is transmitted from the master side, the control circuit 32 performs logical OR (OR) of the contents of the shift register (SR) and the EPROM 34. Is output to the D / A converter in the sensor device 30.
- FIG. 20 is a diagram illustrating state transition
- FIG. 21 is a diagram illustrating each state.
- a table T2 in FIG. 21 describes each state in the state transition diagram in FIG. Note that “No.” in the state transition diagram shown in FIG. 20 corresponds to “No.” in the table T1 in FIG.
- the sensor device 30 is turned on. [S21] After the power is turned on, the reset operation of the control circuit 32 causes the sensor device 30 to transition to an initialization state (Init).
- the initialization state (Init) is a state waiting for data input through the slave interface circuit 31.
- the control circuit 32 enters a command analysis state.
- the command analysis state is a state in which a command transmitted from the master side is analyzed.
- the command analysis is performed with 4 clocks based on the value set in the 3-bit command register in the control circuit 32.
- the execution state is a state for determining which state is to be changed next with respect to the set mode.
- the control circuit 32 uses one clock among the four clocks to determine the state to be shifted next.
- the shift state is the register value No. of the 3-bit command register. 1, no. 3, no. 4, no.
- the 48-bit shift register which is the auxiliary memory 33, performs a shift operation with 48 input clocks.
- control circuit 32 shifts to the restart state when the master side device writes data to the EPROM 34 based on voltage application to the terminals EV and CG or when analog measurement is performed.
- FIG. 22 is a time chart showing the operation in the EPROM writing mode.
- CK, MODE [2: 0], IDENT, SFTEN, and CNT6BIT [5: 0] in the drawing represent internal signals in the control circuit 32.
- the symbol “?” In the figure indicates 0 or 1 data input from the terminal OW, and the symbol “b” indicates that the numerical value is a binary number (the same applies hereinafter).
- the clock signal CK is a clock output from the above-described terminal ICCLK of the slave interface circuit 31.
- the mode setting signal MODE [2: 0] is the value of the 3-bit command register.
- the first data (data shown at the left end in FIG. 23) 001b of the mode setting signal MODE [2: 0] is an initial value of the mode setting signal MODE [2: 0], and the clock signal CK is input. Each time the data is shifted to the left, the data (0 or 1 data indicated by “?”) Input from the terminal OW is shifted into the minimum bit.
- the signal IDENT is a signal that becomes H level when the 3-bit write operation of the 3-bit command register is completed, and becomes L level when the 3-bit write operation is not completed.
- the shift enable signal SFTEN is a signal that is H level when the 48-bit shift register is in a shift state of 48 clocks, and is L level in other states.
- the count control signal CNT6BIT [5: 0] is a value of a 6-bit counter for counting 48 bits.
- the signal IDENT and the shift enable signal SFTEN become L level from the next cycle, the 6-bit counter is reset, and the count value becomes 00d from the next cycle.
- FIG. 23 is a time chart showing the operation in the reset mode.
- the signal IDENT is at the L level. Further, since the 48-bit shift register is not in a shift operation, the shift enable signal SFTEN is at L level and the 6-bit counter is not activated, so the output value is 00d.
- FIG. 24 is a diagram showing a configuration of the semiconductor physical quantity sensor device.
- the semiconductor physical quantity sensor apparatus shown by FIG. 1 of patent document 4 is shown.
- the slave interface circuit 31 having the function of the slave side data communication device 10s and the control circuit 32 are provided in the interface portion, thereby reducing the number of terminals. ing.
- the slave interface circuit 31 and the control circuit 32 of the sensor device 30 correspond to the operation selection circuit in the semiconductor physical quantity sensor device shown in FIG.
- the data and the clock are combined with the data and the clock by the terminals DS and CLK of the semiconductor physical quantity sensor device shown in FIG.
- the enable signal at the terminal E of the semiconductor physical quantity sensor device shown in FIG. 24 is generated in the control circuit 32.
- the sensor device 30 determines the logic level H / L based on the three voltage levels (5 V, 3.3 V, GND) obtained by superimposing the clock and the data, and the control contents of the EPROM 34 are determined.
- the configuration has a 3-bit command register for holding a mode to be determined.
- the terminals DS, CLK, and E of the semiconductor physical quantity sensor device shown in FIG. 24 can be eliminated, and communication with the master side can be performed by the terminal OW, and the size can be reduced by reducing the number of terminals.
- the sensor device 30 can be provided as a small device with a reduced number of terminals as a device for performing sensitivity adjustment, temperature characteristic adjustment, and offset adjustment by electrical trimming using the EPROM 34. .
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Abstract
Description
入力クロック側トランジスタは、基準電位と通信ラインとの間に接続され、入力クロックによりスイッチングする。第1のトランジスタは、第1の電位と、通信ラインとの間に接続される。第2のトランジスタは、第1の電位よりも低い第2の電位に一端が接続される。第3のトランジスタは、第2の電位に一端が接続される。マスタ側抵抗は、第2のトランジスタの他端と第3のトランジスタの他端との間に接続される。接続遮断回路は、第1のトランジスタのスイッチング状態に応じて、第2、第3のトランジスタと通信ラインとの間の電気的接続を遮断する。マスタ側データ再生回路は、通信ラインを介してスレーブ側データ通信装置から送信されたデータを再生する。
第4のトランジスタは、第1の電位と同等または第1の電位よりも高い第3の電位と、通信ラインとの間に接続される。スレーブ側抵抗は、通信ラインと基準電位との間に接続される。クロック再生回路は、通信ラインを介してマスタ側データ通信装置から送信されたクロックを再生する。スレーブ側データ再生回路は、通信ラインを介してマスタ側データ通信装置から送信されたデータを再生する。
本発明の上記および他の目的、特徴および利点は本発明の例として好ましい実施の形態を表す添付の図面と関連した以下の説明により明らかになるであろう。
NMOSトランジスタMN1は、基準電位(GND)と通信ラインL1との間に接続され、クロックckによりスイッチングする。
接続遮断回路1a-1は、PMOSトランジスタMP1のスイッチング状態に応じて、PMOSトランジスタMP2、MP3と、通信ラインL1との間の電気的接続を遮断する。
一方、スレーブ側データ通信装置1bは、PMOSトランジスタMP4、抵抗R2(スレーブ側抵抗)、クロック再生回路1b-1およびスレーブ側データ再生回路1b-2を含む。PMOSトランジスタMP4は、第4のトランジスタに該当する。
ここで、NMOSトランジスタMN1は、インバータInv1に入力されるクロックckが低電位レベル(Lレベル)の場合にオンして、通信ラインL1上の電位をGNDにする。
また、マスタ側データ通信装置10mは、構成素子として、論理素子Ic1、Ic2、インバータInv0、Inv1、抵抗R1、NMOSトランジスタMN1、PMOSトランジスタMP0~MP3、コンパレータCmp1および基準電圧源Vr1を備えている。
スレーブ側データ通信装置10sにおける各素子の接続関係について記すと、端子ICDHは、論理素子Ic3の入力端b1に接続し、端子ICDEは、論理素子Ic3の入力端b2に接続する。端子ICCLKは、論理素子Ic3の入力端b3と、バッファIc4の出力端と接続する。端子ICDIは、コンパレータCmp2の出力端に接続する。
ここで、コンパレータCmp2の負側入力端に接続している基準電圧源Vr2は、5V(第3の電位)と3.3V(第2の電位)との中間電位(≒4.2V)を発生するものとする。
この場合、クロックのHレベルは、シリアル通信信号w1の5Vレベルまたは3.3Vレベルから再生され、クロックのLレベルは、シリアル通信信号w1のGNDに相当する。
次にマスタ側データ通信装置10mが、スレーブ側データ通信装置10sへデータを書き込む場合の書き込みモードの動作について、図2と図4を用いて説明する。
〔時間帯t1、t3、t5、t7、t9〕マスタ側データ通信装置10mでは、クロックckmがLレベルのとき、NMOSトランジスタMN1はオンする。したがって、端子DIOはGNDにつながるから、送信すべきデータdm1のレベルにかかわらず、通信ラインL1を流れるシリアル通信信号w1は、GNDになる。
〔時間帯t2、t6〕マスタ側データ通信装置10mでは、クロックckmがHレベル、データdm1がHレベル、イネーブル信号e1がHレベルになっており、スレーブ側データ通信装置10sのイネーブル信号e2はLレベルになっている。
一方、コンパレータCmp2の正側入力端が5Vになり、負側入力端の基準電圧4.2Vより高いから、コンパレータCmp2は、Hレベルのデータds1を出力する。なお、伝送遅延時間Δtの後にHレベルが出力されることが図中示されている。
一方、コンパレータCmp2の正側入力端が3.3Vになり、負側入力端の基準電圧4.2Vより低いから、コンパレータCmp2は、Lレベルのデータds1を出力する。
〔時間帯t11、t13、t15、t17、t19〕マスタ側データ通信装置10mでは、クロックckmがLレベルのとき、NMOSトランジスタMN1はオンする。したがって、端子DIOはGNDにつながるから、シリアル通信信号w1は、GNDレベルになる。
また、マスタ側データ通信装置10mでは、コンパレータCmp1の正側入力端が3.3Vになり、負側入力端の基準電圧4.2Vより低いから、コンパレータCmp1は、Lレベルのデータdm2を出力する。
PMOSトランジスタMP1がオン状態のとき、通信ラインL1を5Vにするような動作となる。このとき、図6のマスタ側データ通信装置100mの構成では、PMOSトランジスタMP2のドレイン側電位が、3.3Vよりも高くなる。同様に、PMOSトランジスタMP3のドレイン側電位も、抵抗R1を介して3.3Vよりも高くなる。
図9はデータ通信システムの構成例を示す図である。データ通信システム1-3は、マスタ側データ通信装置10mと、スレーブ側データ通信装置10s-1とを備える。
また、スレーブ側データ通信装置10s-1は、図2に示される、論理素子Ic3を備えておらず、その代わりに、論理素子Ic5、Ic6およびインバータInv2を備える構成になっている。
図13は、さらに別のシステム構成例を示す図である。マスタ側をマイコンに置き替えたシステム構成例を示している。データ通信システム2-4は、マイコン20bと、スレーブ側装置30cとを備え、マイコン20bとスレーブ側装置30cとは、通信ラインL1で接続される。その他の構成は図12と同じである。
マスタ側データ通信装置10mが、スレーブ側データ通信装置10sに対して、データ授受が不要であり、何らかの設定のみを行うような場合には、通信フォーマットf1が使用される。
マスタ側データ通信装置10mが、スレーブ側データ通信装置10sに対して、データ授受を要するデータの書き込み/読み出しなどを行うような場合には、通信フォーマットf2が使用される。
〔S2〕マスタ側装置とスレーブ側装置が、動作待ち状態(IDLE)に遷移する。
〔S3〕マスタ側装置とスレーブ側装置が、コマンド設定状態(CMD)に遷移する。コマンド設定状態(CMD)では、コマンドの設定、受付、デコード処理などが行われる。
〔S5〕コマンドがデータ書き込みの場合、コマンド設定状態(CMD)からデータ書き込み状態(WT)に遷移する。データ書き込み状態(WT)では、マスタ側データ通信装置10mからスレーブ側データ通信装置10sへ書き込みデータが送信される。
〔S7〕コマンドがデータ読み出しの場合、コマンド設定状態(CMD)からデータ読み出し状態(RD)に遷移する。データ読み出し状態(RD)では、スレーブ側データ通信装置10sからマスタ側データ通信装置10mへ読み出しデータが送信される。
なお、上記において、コマンド設定状態(CMD)、データ書き込み状態(WT)およびデータ読み出し状態(RD)は、各処理時間があらかじめクロック数によって決められている。このため、マスタ側およびスレーブ側の制御回路では、クロックのカウント処理を行って、状態遷移する際のタイミングを検出している。
〔S12〕マスタ側装置とスレーブ側装置が、動作待ち状態(IDLE)に遷移する。
〔S13〕マスタ側装置とスレーブ側装置が、コマンド設定状態(CMD)に遷移する。
〔S16〕データ書き込みが終了すると、データ書き込み状態(WT)から動作待ち状態(IDLE)に遷移する。
〔S18〕データ読み出しが終了すると、データ読み出し状態(RD)から動作待ち状態(IDLE)に遷移する。
なお、上述の特許文献3に記載される図2の構成では、スレーブからマスタへのHレベル送信ができないため、スレーブ側の電源状態を認識できない。
端子OWは、上述したように、通信ラインL1と接続して、マスタ側データ通信装置10mと通信するための入出力インタフェース端子である。端子OWには、データとクロックとの合成信号が入出力する。端子Voutは、センサ素子36によって検知された結果を出力する端子である。
No.3の場合、名称が「参照」であり、マスタ側から“010”のコマンドが送信されると、制御回路32は、EPROM34の内容を補助メモリ33であるシフトレジスタ(S.R.)にセットする。
〔S21〕電源投入後、制御回路32のリセット動作により、センサ装置30は、初期化状態(Init)に遷移する。初期化状態(Init)は、スレーブインタフェース回路31を通じてのデータ入力待ち状態である。
〔S22b〕制御回路32は、モードを設定すると、実行状態に遷移する。
〔S24〕モード設定が、テーブルT1のNo.1、No.3、No.4、No.5のいずれかである場合、制御回路32は、シフト状態へ遷移する。
さらに、No.5(書き込み)の場合、EPROM34へ48ビットシフトレジスタの値の書き込みを行う。
なお、電圧EV、CGは、端子EVと端子CGに印加される電圧を示しており、EPROM34へのデータ書き込み時には、例えば、電圧EV=9V、電圧CG=18Vになる。
この期間中は、3ビットの書き込み動作が未完了であるから、信号IDENTはLレベルである。また、48ビットシフトレジスタはシフト動作ではないので、シフトイネーブル信号SFTENはLレベル、6ビットカウンタもカウント未起動なので、出力値は00d(dは00が十進数であることを示す記号である。以下同様。)である。
〔S33〕シフト48クロック期間において、48ビットシフトレジスタの48クロックのシフト状態である。シフトイネーブル信号SFTENは、信号IDENTの立ち上りから1クロック遅れて、シフト動作であることが確定してからHレベルになっている。また、カウント制御信号CNT6BIT[5:0]は、シフトイネーブル信号SFTENの立ち上りから1クロック遅れてカウント動作が開始している。
図23はリセットモードの動作を示すタイムチャートである。
次にセンサ装置30と、上述の特許文献4との構成上の差異について説明する。図24は半導体物理量センサ装置の構成を示す図である。特許文献4の図1に示される半導体物理量センサ装置を示している。
そして、センサ装置30では、図24に示す半導体物理量センサ装置の端子DS、CLKによるデータとクロックに対して、データとクロックを合成することで、1本の端子OWで制御可能としている。また、図24に示す半導体物理量センサ装置の端子Eのイネーブル信号については、制御回路32内で生成することにしている。
上記については単に本発明の原理を示すものである。さらに、多数の変形、変更が当業者にとって可能であり、本発明は上記に示し、説明した正確な構成および応用例に限定されるものではなく、対応するすべての変形例および均等物は、添付の請求項およびその均等物による本発明の範囲とみなされる。
1a マスタ側データ通信装置
1b スレーブ側データ通信装置
L1 通信ライン
MN1 入力クロック側トランジスタ(NMOSトランジスタ)
MP1~MP4 第1~第4のトランジスタ(PMOSトランジスタ)
R1 マスタ側抵抗
R2 スレーブ側抵抗
Inv1 インバータ
1a-1 接続遮断回路
1a-2 マスタ側データ再生回路
1b-1 クロック再生回路
1b-2 スレーブ側データ再生回路
ck クロック
r1~r4 第1~第4の条件信号
DIO、OW 端子
Claims (10)
- 1線の通信ラインを介して、スレーブ側と双方向通信を行うマスタ側データ通信装置と、
前記通信ラインを介して、前記マスタ側データ通信装置と双方向通信を行うスレーブ側データ通信装置と、
を備え、
前記マスタ側データ通信装置は、
基準電位と前記通信ラインとの間に接続され、入力クロックによりスイッチングする入力クロック側トランジスタと、
第1の電位と、前記通信ラインとの間に接続される第1のトランジスタと、
前記第1の電位よりも低い第2の電位に一端が接続される第2のトランジスタと、
前記第2の電位に一端が接続される第3のトランジスタと、
前記第2のトランジスタの他端と前記第3のトランジスタの他端との間に接続されるマスタ側抵抗と、
前記第1のトランジスタのスイッチング状態に応じて、前記第2、第3のトランジスタと前記通信ラインとの間の電気的接続を遮断する接続遮断回路と、
前記通信ラインを介して前記スレーブ側データ通信装置から送信されたデータを再生するマスタ側データ再生回路と、を含み、
前記スレーブ側データ通信装置は、
前記第1の電位と同等または前記第1の電位よりも高い第3の電位と、前記通信ラインとの間に接続される第4のトランジスタと、
前記通信ラインと前記基準電位との間に接続されるスレーブ側抵抗と、
前記通信ラインを介して前記マスタ側データ通信装置から送信されたクロックを再生するクロック再生回路と、
前記通信ラインを介して前記マスタ側データ通信装置から送信されたデータを再生するスレーブ側データ再生回路と、を含む、
ことを特徴とするデータ通信システム。 - 前記入力クロック側トランジスタは、前記クロックが低電位レベルの場合にオンして、前記通信ライン上の電位を前記基準電位とし、
前記第1のトランジスタは、マスタ側からスレーブ側へのデータ送信時に、データ、マスタ側イネーブル信号および前記クロックが高電位レベルになると第1の条件信号によりオンされて、前記通信ライン上の電位を前記第1の電位とし、
前記第2のトランジスタは、マスタ側からスレーブ側へのデータ書き込み時に、前記データが低電位レベル、かつ前記マスタ側イネーブル信号と前記クロックとが高電位レベルになると第2の条件信号によりオンされて、前記通信ライン上の電位を前記第2の電位とし、
前記第3のトランジスタは、マスタ側がスレーブ側のデータを読み出す時に、前記マスタ側イネーブル信号が低電位レベルになると第3の条件信号によりオンされて、前記マスタ側抵抗を介して、前記第2の電位で前記通信ラインをプルアップ状態にし、
前記第4のトランジスタは、マスタ側がスレーブ側から送信されるデータを読み出す時に、データと、スレーブ側イネーブル信号および前記クロック再生回路で再生されたクロックが高電位レベルになると第4の条件信号によりオンされて、前記通信ライン上の電位を前記第3の電位とする、
ことを特徴とする請求項1記載のデータ通信システム。 - 前記接続遮断回路は、インバータと、トランジスタとを含み、前記インバータの入力端は、前記第1のトランジスタのゲートに接続し、前記インバータの出力端は、前記トランジスタのゲートに接続し、前記トランジスタのソースは、前記マスタ側抵抗の他端と、前記第2のトランジスタのドレインと接続し、前記トランジスタのドレインは、前記通信ラインに接続して、前記第1のトランジスタがオンしたときに前記トランジスタがオフして、前記第2、第3のトランジスタと前記通信ラインとの間の電気的接続を遮断することを特徴とする請求項1記載のデータ通信システム。
- 前記接続遮断回路は、ダイオードを含み、前記ダイオードのアノードは、前記マスタ側抵抗の他端と、前記第2のトランジスタのドレインと接続し、前記ダイオードのカソードは、前記通信ラインに接続して、前記第1のトランジスタがオンしたときに、前記ダイオードが逆バイアス状態になって、前記第2、第3のトランジスタと前記通信ラインとの間の電気的接続を遮断することを特徴とする請求項1記載のデータ通信システム。
- 前記マスタ側データ再生回路は、第1のコンパレータであり、前記第1のコンパレータの一方の入力端は前記通信ラインに接続し、前記第1のコンパレータの他方の入力端には、前記第1の電位と前記第2の電位との中間電位が入力され、
前記スレーブ側データ再生回路は、第2のコンパレータであり、前記第2のコンパレータの一方の入力端は前記通信ラインに接続し、前記第2のコンパレータの他方の入力端には、前記第3の電位と前記第2の電位との中間電位が入力される、
ことを特徴とする請求項1記載のデータ通信システム。 - 前記第4のトランジスタは、前記スレーブ側データ通信装置側に異常が発生した場合には自律的にオンして、前記通信ライン上の電位を前記第3の電位にして、前記マスタ側データ通信装置へ異常通知を行うことを特徴とする請求項1記載のデータ通信システム。
- 前記スレーブ側データ通信装置は、正常電源で動作している場合は、前記マスタ側データ通信装置へ高電位レベルを送信し、正常電源で動作していない場合は、GNDレベルを出力し、前記マスタ側データ通信装置は、前記スレーブ側データ通信装置が該高電位レベルを送信できるか否かを判別することで、前記スレーブ側データ通信装置の電源状態を認識することを特徴とする請求項1記載のデータ通信システム。
- 1線の通信ラインを介して、スレーブ側と双方向通信を行うデータ通信装置において、
基準電位と前記通信ラインとの間に接続され、入力クロックによりスイッチングする入力クロック側トランジスタと、
第1の電位と、前記通信ラインとの間に接続される第1のトランジスタと、
前記第1の電位よりも低い第2の電位に一端が接続される第2のトランジスタと、
前記第2の電位に一端が接続される第3のトランジスタと、
前記第2のトランジスタの他端と前記第3のトランジスタの他端との間に接続されるマスタ側抵抗と、
前記第1のトランジスタのスイッチング状態に応じて、前記第2、第3のトランジスタと前記通信ラインとの間の電気的接続を遮断する接続遮断回路と、
前記通信ラインを介してスレーブ側から送信されたデータを再生するマスタ側データ再生回路と、
を有することを特徴とするデータ通信装置。 - 1線の通信ラインを介して、マスタ側と双方向通信を行うデータ通信装置において、
マスタ側に供給されるマスタ側電位と同等または前記マスタ側電位よりも高いスレーブ側電位と、前記通信ラインとの間に接続されるトランジスタと、
前記通信ラインと基準電位との間に接続されるスレーブ側抵抗と、
前記通信ラインを介してマスタ側から送信されたクロックを再生するクロック再生回路と、
前記通信ラインを介してマスタ側から送信されたデータを再生するスレーブ側データ再生回路と、
を有することを特徴とするデータ通信装置。 - 1線の通信ラインを介して、マスタ側と双方向通信を行い、物理量を検知するセンサ装置において、
マスタ側に供給されるマスタ側電位と同等または前記マスタ側電位よりも高いスレーブ側電位と、前記通信ラインとの間に接続されるトランジスタと、1線の通信ラインと基準電位との間に接続されるスレーブ側抵抗と、前記通信ラインを介してマスタ側から送信されたクロックを再生するクロック再生回路と、前記通信ラインを介してマスタ側から送信されたデータを再生するスレーブ側データ再生回路と、を含み、マスタ側と前記通信ラインを介して通信するためのインタフェース回路と、
検知した前記物理量に応じた電気信号を生成するセンサ素子と、
前記電気信号を増幅する増幅回路と、
入力されたトリミングデータを一時的に記憶する補助メモリと、
前記補助メモリに記憶されたトリミングデータを電気的な書き込み動作によって記憶する主メモリと、
前記補助メモリに記憶されたトリミングデータ、または前記主メモリに記憶されたトリミングデータにもとづいて、前記センサ素子の出力特性を調整する調整回路と、
前記主メモリの制御モードを決定する制御回路と、
を備え、
装置端子として、前記増幅回路で増幅された電気信号を外部に出力する単一の出力端子と、前記主メモリに書き込む前記トリミングデータを決定するために、トリミング用クロックを受信し、かつデータを入出力する、前記通信ラインに接続された単一の入出力インタフェース端子と、前記主メモリにデータ書き込みを行う場合の電圧印加に要する複数の電圧印加用端子とを有する、
ことを特徴とするセンサ装置。
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JP6206607B2 (ja) | 2017-10-04 |
DE112015005947T5 (de) | 2018-01-04 |
US20200244432A1 (en) | 2020-07-30 |
US10841071B2 (en) | 2020-11-17 |
US10200186B2 (en) | 2019-02-05 |
US20190173660A1 (en) | 2019-06-06 |
US20170126390A1 (en) | 2017-05-04 |
US10644866B2 (en) | 2020-05-05 |
CN106664270B (zh) | 2021-01-08 |
JPWO2016203529A1 (ja) | 2017-06-29 |
CN106664270A (zh) | 2017-05-10 |
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