CN103763186A - USB-CAN/LIN gateway system - Google Patents
USB-CAN/LIN gateway system Download PDFInfo
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- CN103763186A CN103763186A CN201410014187.0A CN201410014187A CN103763186A CN 103763186 A CN103763186 A CN 103763186A CN 201410014187 A CN201410014187 A CN 201410014187A CN 103763186 A CN103763186 A CN 103763186A
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Abstract
The invention relates to a USB-CAN/LIN gateway system. A CAN interface circuit is in signal connection with the CAN communication port and the I/O interface of a communication microcontroller, an LIN interface circuit is in signal connection with the serial communication port of the communication microcontroller, a connector assembly circuit is connected with a USB bus, a CAN bus and an LIN bus outside the system, an optoelectronic isolation circuit is in signal connection with the SPI communication port and the I/O interface of the communication microcontroller and in signal connection with the SPI communication port and the I/O interface of a USB microcontroller, a debugging interface circuit is connected with the debugging interface of the communication microcontroller and the debugging interface of the USB microcontroller, and a state indicator circuit is in signal connection with the I/O interface of the communication microcontroller. A USB interface is adopted in the USB-CAN/LIN gateway system, and therefore the USB-CAN/LIN gateway system has the advantages of being high in speed, good in portability and high in generality.
Description
Technical field
The invention belongs to automotive electronic technology and embedded system field, be specifically related to a kind of USB and turn CAN/LIN gateway system.
Background technology
USB(USB) be a kind of serial bus standards and guidelines that connects computer system and external equipment, be widely used in the products such as PC and mobile device; CAN(local area network) be a kind of fieldbus, speed can reach 1Mbit/s, be widely used in automotive electronics, Industry Control, Medical Devices, track traffic signal, building control, instrument and meter for automation and other numerous systems, CAN adopts many main working methods, between node regardless of principal and subordinate, but can have different priority, communication mode is flexible; The target of LIN is to provide miscellaneous function for existing automotive networking, bandwidth is less, and data are 20Kbit/s conventionally, are used in the occasion of the bandwidth that does not need CAN bus, such as car door, direction indicator lamp, vehicle body comfort sensor, can greatly reduce the cost that adopts CAN bus.
Conventional is CAN/LIN hybrid network at present, and express network adopts CAN, and slow network adopts LIN.
This USB turns CAN/LIN gateway system one end and connects USB, and the other end connects CAN bus and LIN bus, and the gateway function of USB to CAN bus and LIN bus is provided, and realizes mutual communication and protocol conversion.Realization accesses the function of CAN bus and LIN bus by USB, can monitor the communication in CAN bus and LIN bus simultaneously, can be widely used in monitoring, debugging to CAN bus and LIN bus, the isolation of USB power supply and CAN bus and LIN bus power source photoelectricity possesses the features such as portable, low-power consumption simultaneously.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, provide a kind of USB to turn CAN/LIN gateway system.
The concrete technical scheme that the present invention takes is:
USB turns CAN/LIN gateway system and comprises USB microcontroller, communication microcontroller, CAN interface circuit, LIN interface circuit, connector circuit, photoelectric isolating circuit, debug i/f circuit, condition indication circuit, power circuit and clock circuit.
CAN interface circuit is connected with I/O mouth signal with the CAN PORT COM of communication microcontroller, LIN interface circuit is connected with the COM port signal of communication microcontroller, the USB of connector Circuits and Systems outside, CAN, LIN bus connects, photoelectric isolating circuit is connected with I/O mouth signal with the SPI PORT COM of communication microcontroller, be connected with I/O mouth signal with the SPI PORT COM of USB microcontroller, debug i/f circuit is connected with the debugging interface of USB microcontroller with the debugging interface of communication microcontroller, condition indication circuit is connected with the I/O mouth signal of communication microcontroller.
Described USB microcontroller adopts the chip that the model of Cypress company is CY7C64215-28PVXC.
Described communication microcontroller adopts the chip that the model of Freescale company is MC9S12C32CFA16.
Described CAN interface circuit comprises CAN bus transceiver chip U9, CAN bus transceiver chip U9 the 1st pin is connected with communication microcontroller 44 pin, CAN bus transceiver chip U9 the 2nd pin connects fieldbus ground, CAN bus transceiver chip U9 the 3rd pin is connected with 5V power supply, CAN bus transceiver chip U9 the 4th pin is connected with communication microcontroller 45 pin, CAN bus transceiver chip U9 the 5th pin is unsettled, CAN bus transceiver chip U9 the 6th pin, the 7th pin are connected with connector circuit, and CAN bus transceiver chip U9 the 8th pin is connected with communication microcontroller 32 pin.
Described LIN interface circuit comprises the first pull-up resistor R7, the second pull-up resistor R8, the first filter capacitor C15, the one LIN bus protection device N1, LIN bus physical layer chip U1, one end of the first pull-up resistor R7, LIN bus physical layer chip U1 the 5th pin is connected with communication microcontroller 39 pin, one end of the second pull-up resistor R8, LIN bus physical layer chip U1 the 6th pin is connected with communication microcontroller 38 pin, one end of the first filter capacitor C15, one end of the one LIN bus protection device N1 is connected with connector circuit, the other end of the first pull-up resistor R7, the other end of the second pull-up resistor R8, LIN bus physical layer chip U1 the 2nd pin, the 3rd pin is connected with 5V power supply, the other end of the first filter capacitor C15, the other end of the one LIN bus protection device N1, LIN bus physical layer chip U1 the 4th pin, the 8th pin, the 12nd pin, the 18th pin connects fieldbus ground, and LIN bus physical layer chip U1 the 16th pin is connected with VSUP power supply, LIN bus physical layer chip U1 the 1st pin, the 9th pin, the 10th pin, the 11st pin, the 13rd pin, the 14th pin, the 15th pin, the 17th pin, the 19th pin, the 20th pin is unsettled.
Described connector circuit comprises the first build-out resistor R17, the second build-out resistor R18, the first connector LINCON, the second connector CANCON, the 3rd connector USBCON, one end of the first build-out resistor R17 is connected with the 3rd connector USBCON the 3rd pin, one end of the second build-out resistor R18 is connected with the 3rd connector USBCON the 4th pin, the first connector LINCON the 3rd pin is connected with LIN bus physical layer chip U1 the 7th pin, the first connector LINCON the 2nd pin, the second connector CANCON the 2nd pin connects fieldbus ground, the first connector LINCON the 1st pin, the second connector CANCON the 1st pin is connected with VBAT power supply, the second connector CANCON the 4th pin is connected with CAN bus transceiver chip U9 the 7th pin, the second connector CANCON the 2nd pin is connected with CAN bus transceiver chip U9 the 6th pin, the 3rd connector USBCON the 6th pin, the 5th pin, the 4th pin connects usb host ground, the 3rd connector USBCON the 1st pin is connected with 5VUSB power supply, the other end of the first build-out resistor R17 is connected with USB microcontroller the 14th pin, the other end of the second build-out resistor R18 is connected with USB microcontroller the 15th pin.
Described photoelectric isolating circuit comprises the first current-limiting resistance R9, the second current-limiting resistance R11, the 3rd current-limiting resistance R13, the 4th current-limiting resistance R15, the first pull down resistor R10, the second pull down resistor R12, the 3rd pull down resistor R14, the 4th pull down resistor R16, the first optocoupler U4, the second optocoupler U5, the 3rd optocoupler U6, the 4th optocoupler U7, one end of the first current-limiting resistance R9 is connected with communication microcontroller the 12nd pin, the other end of the first current-limiting resistance R9 is connected with the A pin of the first optocoupler U4, one end of the second current-limiting resistance R11 is connected with communication microcontroller the 43rd pin, the other end of the second current-limiting resistance R11 is connected with the A pin of the second optocoupler U5, one end of the 3rd current-limiting resistance R13 is connected with USB microcontroller the 21st pin, the other end of the 3rd current-limiting resistance R13 is connected with the A pin of the 3rd optocoupler U6, one end of the 4th current-limiting resistance R15 is connected with USB microcontroller the 25th pin, the other end of the 4th current-limiting resistance R15 is connected with the A pin of the 4th optocoupler U7, one end of the first pull down resistor R10, the E pin of the first optocoupler U4 is connected with USB microcontroller the 23rd pin, one end of the second pull down resistor R12, the E pin of the second optocoupler U5 is connected with USB microcontroller the 4th pin, one end of the 3rd pull down resistor R14, the E pin of the 3rd optocoupler U6 is connected with communication microcontroller the 40th pin, one end of the 4th pull down resistor R16, the E pin of the 4th optocoupler U7 is connected with communication microcontroller the 41st pin, the other end of the first pull down resistor R10, the other end of the second pull down resistor R12, the K pin of the 3rd optocoupler U6, the K pin of the 4th optocoupler U7 connects usb host ground, the other end of the 3rd pull down resistor R14, the other end of the 4th pull down resistor R16, the K pin of the first optocoupler U4, the K pin of the second optocoupler U5 connects fieldbus ground, the C pin of the first optocoupler U4, the C pin of the second optocoupler U5 is connected with 5VUSB power supply, the C pin of the 3rd optocoupler U6, the C pin of the 4th optocoupler U7 is connected with 5V power supply.
Described debug i/f circuit comprises the 3rd pull-up resistor R1, the 4th pull-up resistor R2, the 4th connector BDM, the 5th connector ISSP, the first button K1, one end of the 3rd pull-up resistor R1, the 4th connector BDM the 1st pin is connected with communication microcontroller 11 pin, one end of the 4th pull-up resistor R2, the 4th connector BDM the 4th pin, one end of the first button K1 is connected with communication microcontroller 17 pin, the 4th connector BDM the 2nd pin, another termination fieldbus ground of the first button K1, the 4th connector BDM the 3rd pin, the 5th pin is unsettled, the 4th connector BDM the 6th pin, the other end of the 3rd pull-up resistor R1, another termination 5V power supply of the 4th pull-up resistor R2, the 5th connector ISSP the 1st pin is connected with USB microcontroller 17 pin, the 5th connector ISSP the 2nd pin is connected with USB microcontroller 12 pin, the 5th connector ISSP the 3rd pin is unsettled, the 5th connector ISSP the 4th pin connects usb host ground, the 5th connector ISSP the 5th pin connects 5VUSB power supply.
Described condition indication circuit comprises the 5th current-limiting resistance R3, the 6th current-limiting resistance R4, the first indicator light R, the second indicator light G, the 5th current-limiting resistance R3 one end is connected with communication microcontroller 34 pin, the 5th current-limiting resistance R3 other end is connected with the first indicator light R negative electrode, the 6th current-limiting resistance R4 one end is connected with communication microcontroller 33 pin, the 6th current-limiting resistance R4 other end is connected with the second indicator light G negative electrode, and the first indicator light R anode, the second indicator light G anode connect 5V power supply.
Described power circuit comprises the second filter capacitor C1, the 3rd filter capacitor C2, the 4th filter capacitor C3, the 5th filter capacitor C4, the 6th filter capacitor C5, the 7th filter capacitor C6, the 8th filter capacitor C7, the 9th filter capacitor C8, the tenth filter capacitor C9, the 11 filter capacitor C10, the 12 filter capacitor C11, the first Schottky diode D1, the first direct current stabilizer U3, one end of the second filter capacitor C1, the anode of the 3rd filter capacitor C2, the negative electrode of the first Schottky diode D1, the first direct current stabilizer U3 the 1st pin connects VSUP power supply, one end of the 4th filter capacitor C3, the anode of the 5th filter capacitor C4, one end of the 6th filter capacitor C5, one end of the 7th filter capacitor C6, one end of the 8th filter capacitor C7, one end of the 9th filter capacitor C8, the first direct current stabilizer U3 the 3rd pin connects 5V power supply, one end of the tenth filter capacitor C9, a termination 5VUSB power supply of the 11 filter capacitor C10, a termination VDD2.5 power supply of the 12 filter capacitor C11, the anode of the first Schottky diode D1 connects VBAT power supply, the other end of the second filter capacitor C1, the negative terminal of the 3rd filter capacitor C2, the other end of the 4th filter capacitor C3, the negative terminal of the 5th filter capacitor C4, the other end of the 6th filter capacitor C5, the other end of the 7th filter capacitor C6, the other end of the 8th filter capacitor C7, the other end of the 9th filter capacitor C8, the other end of the 12 filter capacitor C11, the first direct current stabilizer U3 the 4th pin connects fieldbus ground, the other end of the tenth filter capacitor C9, another termination usb host ground of the 11 filter capacitor C10.
Described clock circuit comprises the first starting of oscillation capacitor C 16, the second starting of oscillation capacitor C 17, crystal oscillator Y1, the first starting of oscillation resistance R 6, one end of one end of one end of the first starting of oscillation capacitor C 16, crystal oscillator Y1, the first starting of oscillation resistance R 6 is connected with communication microcontroller 21 pin, the other end of the other end of one end of the second starting of oscillation capacitor C 17, crystal oscillator Y1, the first starting of oscillation resistance R 6 is connected with communication microcontroller 22 pin, the other end ground connection of the other end of the first starting of oscillation capacitor C 16, the second starting of oscillation capacitor C 17.
Beneficial effect of the present invention:
(1), adopt USB interface, possess that speed is high, the feature of good portability, universal strong.
(2), can access CAN bus and LIN bus simultaneously.
(3), low in energy consumption, photoelectricity isolation between usb host and CAN bus, LIN bus, reliability is higher, possesses multiple circuit protection function simultaneously; .
Accompanying drawing explanation
Fig. 1 is use occasion schematic diagram of the present invention;
Fig. 2 is structural representation of the present invention;
Fig. 3 is USB micro controller module schematic diagram in Fig. 2;
Fig. 4 is communication micro controller module schematic diagram in Fig. 2;
Fig. 5 is CAN interface module schematic diagram in Fig. 2;
Fig. 6 is LIN interface module schematic diagram in Fig. 2;
Fig. 7 is connector circuit module schematic diagram in Fig. 2;
Fig. 8 is photoelectric isolating circuit module diagram in Fig. 2;
Fig. 9 is debug i/f circuit module diagram in Fig. 2;
Figure 10 is condition indication circuit module diagram in Fig. 2;
Figure 11 is power circuit module diagram in Fig. 2;
Figure 12 is clock circuit module diagram in Fig. 2.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further illustrated.
As shown in Figure 1, use occasion of the present invention comprises that usb host 1, USB turn CAN/LIN gateway circuit 2, CAN bus network 3, LIN bus network 4.USB turns CAN/LIN gateway circuit and comprises USB microcontroller 2-1, communication microcontroller 2-2, CAN interface circuit 2-3, LIN interface circuit 2-4, connector circuit 2-5, photoelectric isolating circuit 2-6, debug i/f circuit 2-7, condition indication circuit 2-8, power circuit 2-9 and clock circuit 2-10; Be used for connecting usb host 1 and CAN bus network 3, usb host 1 and LIN bus network 4, realize mutual communication and protocol conversion.
As shown in Figure 2, USB turns CAN/LIN gateway circuit 2 and comprises USB microcontroller 2-1, communication microcontroller 2-2, CAN interface circuit 2-3, LIN interface circuit 2-4, connector circuit 2-5, photoelectric isolating circuit 2-6, debug i/f circuit 2-7, condition indication circuit 2-8, power circuit 2-9 and clock circuit 2-10.
As shown in Figure 3, described USB microcontroller adopts the chip that the model of Cypress company is CY7C64215-28PVXC, USB microcontroller 4 pin connect photoelectric isolating circuit, be used for receiving the E pin signal from the second optocoupler U5, USB microcontroller 21 pin connect photoelectric isolating circuit, be used for controlling conducting and the cut-off of the 3rd optocoupler U6 input, USB microcontroller 23 pin connect photoelectric isolating circuit, be used for receiving the E pin signal from the first optocoupler U4, USB microcontroller 25 pin connect photoelectric isolating circuit, be used for controlling conducting and the cut-off of the 4th optocoupler U7 input, USB microcontroller 14 pin connect connector circuit, be used for connecting one end of the first build-out resistor R17, USB microcontroller 15 pin connect connector circuit, be used for connecting one end of the second build-out resistor R18, USB microcontroller 12 pin connect debug i/f circuit, be used for connecting for debugging the clock signal of USB microcontroller, USB microcontroller 17 pin connect debug i/f circuit, be used for connecting for debugging the data-signal of USB microcontroller, USB microcontroller 1 pin, 3 pin connect usb host ground, USB microcontroller 16 pin, 28 pin connect 5VUSB power supply, USB microcontroller 2 pin, 3 pin, 5 pin, 6 pin, 7 pin, 8 pin, 9 pin, 10 pin, 11 pin, 18 pin, 19 pin, 20 pin, 22 pin, 24 pin, 26 pin, 27 pin are unsettled.
As shown in Figure 4, described communication microcontroller adopts the chip that the model of Freescale company is MC9S12C32CFA16, communication microcontroller 11 pin connect debug i/f circuit, be used for enabling the debugging to communication microcontroller, communication microcontroller 17 pin connect debug i/f circuit, be used for enabling the reset to communication microcontroller, communication microcontroller 12 pin connect photoelectric isolating circuit, be used for controlling conducting and the cut-off of the first optocoupler U4 input, communication microcontroller 40 pin connect photoelectric isolating circuit, be used for receiving the E pin signal from the 3rd optocoupler U6, communication microcontroller 41 pin connect photoelectric isolating circuit, be used for receiving the E pin signal from the 4th optocoupler U7, communication microcontroller 40 pin connect photoelectric isolating circuit, be used for controlling conducting and the cut-off of the second optocoupler U5 input, communication microcontroller 21 pin, 22 pin connect clock circuit, be used for producing the clock of microcontroller, communication microcontroller 32 pin connect CAN interface circuit, be used for controlling the mode of operation of CAN bus transceiver chip U9, communication microcontroller 44 pin connect CAN interface circuit, be used for sending data to CAN bus transceiver chip U9, communication microcontroller 45 pin connect CAN interface circuit, be used for receiving data from CAN bus transceiver chip U9, communication microcontroller 33 pin connection status indicator light circuits, be used for controlling conducting and the cut-off of the second indicator light G, communication microcontroller 34 pin connection status indicator light circuits, be used for controlling conducting and the cut-off of the first indicator light R, communication microcontroller 38 pin connect LIN interface circuit, be used for receiving data from LIN bus physical layer chip U1, communication microcontroller 39 pin connect LIN interface circuit, be used for sending data to LIN bus physical layer chip U1, communication microcontroller 5 pin connect VDD2.5 power supply, communication microcontroller 15 pin, 20 pin, 23 pin, 37 pin, 42 pin, 46 pin connect fieldbus ground, communication microcontroller 16 pin, 35 pin, 36 pin, 47 pin connect 5V power supply, communication microcontroller 1 pin, 2 pin, 3 pin, 4 pin, 7 pin, 8 pin, 9 pin, 10 pin, 13 pin, 14 pin, 18 pin, 19 pin, 24 pin, 25 pin, 26 pin, 27 pin, 28 pin, 29 pin, 30 pin, 31 pin, 48 pin are unsettled.
As shown in Figure 5, described CAN interface circuit comprises CAN bus transceiver chip U9, CAN bus transceiver chip U9 the 1st pin is connected with communication microcontroller 44 pin, CAN bus transceiver chip U9 the 2nd pin connects fieldbus ground, CAN bus transceiver chip U9 the 3rd pin is connected with 5V power supply, CAN bus transceiver chip U9 the 4th pin is connected with communication microcontroller 45 pin, CAN bus transceiver chip U9 the 5th pin is unsettled, CAN bus transceiver chip U9 the 6th pin, the 7th pin is connected with connector circuit, CAN bus transceiver chip U9 the 8th pin is connected with communication microcontroller 32 pin.CAN bus transceiver chip U9 adopts the TJA1050 of NXP company, and CAN interface circuit is used for communicating by letter of connecting communication microcontroller and CAN bus, and CAN bus transceiver chip U9 is wherein used for supporting CAN bus physical layer protocol.
As shown in Figure 6, described LIN interface circuit comprises the first pull-up resistor R7, the second pull-up resistor R8, the first filter capacitor C15, the one LIN bus protection device N1, LIN bus physical layer chip U1, one end of the first pull-up resistor R7, LIN bus physical layer chip U1 the 5th pin is connected with communication microcontroller 39 pin, one end of the second pull-up resistor R8, LIN bus physical layer chip U1 the 6th pin is connected with communication microcontroller 38 pin, one end of the first filter capacitor C15, one end of the one LIN bus protection device N1 is connected with connector circuit, the other end of the first pull-up resistor R7, the other end of the second pull-up resistor R8, LIN bus physical layer chip U1 the 2nd pin, the 3rd pin is connected with 5V power supply, the other end of the first filter capacitor C15, the other end of the one LIN bus protection device N1, LIN bus physical layer chip U1 the 4th pin, the 8th pin, the 12nd pin, the 18th pin connects fieldbus ground, and LIN bus physical layer chip U1 the 16th pin is connected with VSUP power supply, LIN bus physical layer chip U1 the 1st pin, the 9th pin, the 10th pin, the 11st pin, the 13rd pin, the 14th pin, the 15th pin, the 17th pin, the 19th pin, the 20th pin is unsettled.The first pull-up resistor R7 adopts 10KW/0.125W resistance, the second pull-up resistor R8 adopts 2.7KW/0.125W resistance, the first filter capacitor C15 adopts 180pF/50V ceramic disc capacitor, the one LIN bus protection device N1 adopts ON NUP1105L, LIN bus physical layer chip U1 adopts the MLX80001 chip of Melexis company, LIN interface circuit is used for communicating by letter of connecting communication microcontroller and LIN bus, 5 pin that the first pull-up resistor R7 is wherein used for as LIN bus physical layer chip U1 provide and draw, 6 pin that the second pull-up resistor R8 is used for as LIN bus physical layer chip U1 provide and draw, the first filter capacitor C15 is used for as the filtering of LIN bus, the one LIN bus protection device N1 is used for protecting LIN bus, LIN bus physical layer chip U1 is used for supporting LIN bus physical layer protocol.
As shown in Figure 7, described connector circuit comprises the first build-out resistor R17, the second build-out resistor R18, the first connector LINCON, the second connector CANCON, the 3rd connector USBCON, one end of the first build-out resistor R17 is connected with the 3rd connector USBCON the 3rd pin, one end of the second build-out resistor R18 is connected with the 3rd connector USBCON the 4th pin, the first connector LINCON the 3rd pin is connected with LIN bus physical layer chip U1 the 7th pin, the first connector LINCON the 2nd pin, the second connector CANCON the 2nd pin connects fieldbus ground, the first connector LINCON the 1st pin, the second connector CANCON the 1st pin is connected with VBAT power supply, the second connector CANCON the 4th pin is connected with CAN bus transceiver chip U9 the 7th pin, the second connector CANCON the 2nd pin is connected with CAN bus transceiver chip U9 the 6th pin, the 3rd connector USBCON the 6th pin, the 5th pin, the 4th pin connects usb host ground, the 3rd connector USBCON the 1st pin is connected with 5VUSB power supply, the other end of the first build-out resistor R17 is connected with USB microcontroller the 14th pin, the other end of the second build-out resistor R18 is connected with USB microcontroller the 15th pin, the first build-out resistor R17 adopts 22W/0.125W resistance, the second build-out resistor R18 adopts 22W/0.125W resistance, the first connector LINCON adopts the single connector of 2.54mm spacing 3 core, the second connector CANCON adopts the single connector of 2.54mm spacing 4 core, the 3rd connector USBCON adopts the single connector of 2.54mm spacing 6 core, connector circuit is used for accessing usb bus, CAN bus and LIN bus, the first build-out resistor R17 wherein, the second build-out resistor R18 is used for mating the data signal line of usb bus, the first connector LINCON is used for connecting LIN bus, the second connector CANCON is used for connecting CAN bus, the 3rd connector USBCON is used for connecting usb bus.
As shown in Figure 8, described photoelectric isolating circuit comprises the first current-limiting resistance R9, the second current-limiting resistance R11, the 3rd current-limiting resistance R13, the 4th current-limiting resistance R15, the first pull down resistor R10, the second pull down resistor R12, the 3rd pull down resistor R14, the 4th pull down resistor R16, the first optocoupler U4, the second optocoupler U5, the 3rd optocoupler U6, the 4th optocoupler U7, one end of the first current-limiting resistance R9 is connected with communication microcontroller the 12nd pin, the other end of the first current-limiting resistance R9 is connected with the A pin of the first optocoupler U4, one end of the second current-limiting resistance R11 is connected with communication microcontroller the 43rd pin, the other end of the second current-limiting resistance R11 is connected with the A pin of the second optocoupler U5, one end of the 3rd current-limiting resistance R13 is connected with USB microcontroller the 21st pin, the other end of the 3rd current-limiting resistance R13 is connected with the A pin of the 3rd optocoupler U6, one end of the 4th current-limiting resistance R15 is connected with USB microcontroller the 25th pin, the other end of the 4th current-limiting resistance R15 is connected with the A pin of the 4th optocoupler U7, one end of the first pull down resistor R10, the E pin of the first optocoupler U4 is connected with USB microcontroller the 23rd pin, one end of the second pull down resistor R12, the E pin of the second optocoupler U5 is connected with USB microcontroller the 4th pin, one end of the 3rd pull down resistor R14, the E pin of the 3rd optocoupler U6 is connected with communication microcontroller the 40th pin, one end of the 4th pull down resistor R16, the E pin of the 4th optocoupler U7 is connected with communication microcontroller the 41st pin, the other end of the first pull down resistor R10, the other end of the second pull down resistor R12, the K pin of the 3rd optocoupler U6, the K pin of the 4th optocoupler U7 connects usb host ground, the other end of the 3rd pull down resistor R14, the other end of the 4th pull down resistor R16, the K pin of the first optocoupler U4, the K pin of the second optocoupler U5 connects fieldbus ground, the C pin of the first optocoupler U4, the C pin of the second optocoupler U5 is connected with 5VUSB power supply, the C pin of the 3rd optocoupler U6, the C pin of the 4th optocoupler U7 is connected with 5V power supply, and the first current-limiting resistance R9 adopts 330W/0.125W resistance, the second current-limiting resistance R11 adopts 330W/0.125W resistance, the 3rd current-limiting resistance R13 adopts 330W/0.125W resistance, the 4th current-limiting resistance R15 adopts 330W/0.125W resistance, the first pull down resistor R10 adopts 330W/0.125W resistance, the second pull down resistor R12 adopts 330W/0.125W resistance, the 3rd pull down resistor R14 adopts 330W/0.125W resistance, the 4th pull down resistor R16 adopts 330W/0.125W resistance, the first optocoupler U4 adopts PC817 optocoupler, the second optocoupler U5 adopts PC817 optocoupler, the 3rd optocoupler U6 adopts PC817 optocoupler, the 4th optocoupler U7 adopts PC817 optocoupler, photoelectric isolating circuit is used for the signal between isolated communication microcontroller and USB microcontroller, the first current-limiting resistance R9 is wherein used for limiting the On current of the first optocoupler U4 input, the second current-limiting resistance R11 is used for limiting the On current of the second optocoupler U5 input, the 3rd current-limiting resistance R13 is used for limiting the On current of the 3rd optocoupler U6 input, the 4th current-limiting resistance R15 is used for limiting the On current of the 4th optocoupler U7 input, the first pull down resistor R10 is used for providing drop-down for the first optocoupler U4 output end signal, the second pull down resistor R12 is used for providing drop-down for the second optocoupler U5 output end signal, the 3rd pull down resistor R14 is used for providing drop-down for the 3rd optocoupler U6 output end signal, the 4th pull down resistor R16 is used for providing drop-down for the 4th optocoupler U7 output end signal, the first optocoupler U4, the second optocoupler U5, the 3rd optocoupler U6, the 4th optocoupler U7 is used for realizing photoelectricity isolation.
As shown in Figure 9, described debug i/f circuit comprises the 3rd pull-up resistor R1, the 4th pull-up resistor R2, the 4th connector BDM, the 5th connector ISSP, the first button K1, one end of the 3rd pull-up resistor R1, the 4th connector BDM the 1st pin is connected with communication microcontroller 11 pin, one end of the 4th pull-up resistor R2, the 4th connector BDM the 4th pin, one end of the first button K1 is connected with communication microcontroller 17 pin, the 4th connector BDM the 2nd pin, another termination fieldbus ground of the first button K1, the 4th connector BDM the 3rd pin, the 5th pin is unsettled, the 4th connector BDM the 6th pin, the other end of the 3rd pull-up resistor R1, another termination 5V power supply of the 4th pull-up resistor R2, the 5th connector ISSP the 1st pin is connected with USB microcontroller 17 pin, the 5th connector ISSP the 2nd pin is connected with USB microcontroller 12 pin, the 5th connector ISSP the 3rd pin is unsettled, the 5th connector ISSP the 4th pin connects usb host ground, the 5th connector ISSP the 5th pin connects 5VUSB power supply, the 3rd pull-up resistor R1 adopts 4.7KW/0.125W resistance, the 4th pull-up resistor R2 adopts 4.7KW/0.125W resistance, the 4th connector BDM adopts the double connector of 2.54mm spacing 6 core, the 5th connector ISSP adopts the single connector of 2.54mm spacing 5 core, the first button K1 adopts 6*6*5mm touch key, debug i/f circuit is used for communication microcontroller and USB microcontroller to debug, the 3rd pull-up resistor R1 is wherein used for drawing 1 pin of the 4th connector BDM, the 4th pull-up resistor R2 is used for drawing 4 pin of the 4th connector BDM, the 4th connector BDM is used for the debugger of connecting communication microcontroller, the 5th connector ISSP is used for connecting the debugger of USB microcontroller, the first button K1 be used for resetting debugger of communication microcontroller.
As shown in figure 10, described condition indication circuit comprises the 5th current-limiting resistance R3, the 6th current-limiting resistance R4, the first indicator light R, the second indicator light G, the 5th current-limiting resistance R3 one end is connected with communication microcontroller 34 pin, the 5th current-limiting resistance R3 other end is connected with the first indicator light R negative electrode, the 6th current-limiting resistance R4 one end is connected with communication microcontroller 33 pin, the 6th current-limiting resistance R4 other end is connected with the second indicator light G negative electrode, and the first indicator light R anode, the second indicator light G anode connect 5V power supply.The 5th current-limiting resistance R3 adopts 470W/0.125W resistance, the 6th current-limiting resistance R4 to adopt 470W/0.125W resistance, the first indicator light R to adopt red light emitting diodes, the second indicator light G to adopt green LED, condition indication circuit is used to refer to system mode, the 5th current-limiting resistance R3 is wherein used for the first indicator light R to carry out current limliting, and the 6th current-limiting resistance R4 is used for the second indicator light G to carry out current limliting.
As shown in figure 11, described power circuit comprises the second filter capacitor C1, the 3rd filter capacitor C2, the 4th filter capacitor C3, the 5th filter capacitor C4, the 6th filter capacitor C5, the 7th filter capacitor C6, the 8th filter capacitor C7, the 9th filter capacitor C8, the tenth filter capacitor C9, the 11 filter capacitor C10, the 12 filter capacitor C11, the first Schottky diode D1, the first direct current stabilizer U3, one end of the second filter capacitor C1, the anode of the 3rd filter capacitor C2, the negative electrode of the first Schottky diode D1, the first direct current stabilizer U3 the 1st pin connects VSUP power supply, one end of the 4th filter capacitor C3, the anode of the 5th filter capacitor C4, one end of the 6th filter capacitor C5, one end of the 7th filter capacitor C6, one end of the 8th filter capacitor C7, one end of the 9th filter capacitor C8, the first direct current stabilizer U3 the 3rd pin connects 5V power supply, one end of the tenth filter capacitor C9, a termination 5VUSB power supply of the 11 filter capacitor C10, a termination VDD2.5 power supply of the 12 filter capacitor C11, the anode of the first Schottky diode D1 connects VBAT power supply, the other end of the second filter capacitor C1, the negative terminal of the 3rd filter capacitor C2, the other end of the 4th filter capacitor C3, the negative terminal of the 5th filter capacitor C4, the other end of the 6th filter capacitor C5, the other end of the 7th filter capacitor C6, the other end of the 8th filter capacitor C7, the other end of the 9th filter capacitor C8, the other end of the 12 filter capacitor C11, the first direct current stabilizer U3 the 4th pin connects fieldbus ground, the other end of the tenth filter capacitor C9, another termination usb host ground of the 11 filter capacitor C10.The second filter capacitor C1 adopts 0.1uF/50V ceramic disc capacitor, the 3rd filter capacitor C2 adopts 100uF/50V electrochemical capacitor, the 4th filter capacitor C3 adopts 0.1uF/50V ceramic disc capacitor, the 5th filter capacitor C4 adopts 47uF/25V electrochemical capacitor, the 6th filter capacitor C5 adopts 0.1uF/50V ceramic disc capacitor, the 7th filter capacitor C6 adopts 0.1uF/50V ceramic disc capacitor, the 8th filter capacitor C7 adopts 0.22uF/50V ceramic disc capacitor, the 9th filter capacitor C8 adopts 0.22uF/50V ceramic disc capacitor, the tenth filter capacitor C9 adopts 0.1uF/50V ceramic disc capacitor, the 11 filter capacitor C10 adopts 0.1uF/50V ceramic disc capacitor, the 12 filter capacitor C11 adopts 0.1uF/50V ceramic disc capacitor, the first Schottky diode D1 adopts the MBRS140LT3G Schottky diode of ONNN, the first direct current stabilizer U3 adopts the NCV5500 of ONNN, and power circuit provides 5V for other circuit module, VSUP power supply, simultaneously for 5VUSB and VDD2.5 power supply provide filtering, the second filter capacitor C1 wherein, the 3rd filter capacitor C2 is used for as VSUP power supply provides filtering, the 4th filter capacitor C3, the 5th filter capacitor C4, the 6th filter capacitor C5, the 7th filter capacitor C6, the 8th filter capacitor C7, the 9th filter capacitor C8 is used for as 5V power supply provides filtering, the tenth filter capacitor C9, the 11 filter capacitor C10 is used for as 5VUSB power supply provides filtering, and the 12 filter capacitor C11 is used for as VDD2.5 power supply provides filtering, and the first Schottky diode D1 is used for anti-reverse, and the first direct current stabilizer U3 is used for producing 5V power supply.
As shown in figure 12, described clock circuit comprises the first starting of oscillation capacitor C 16, the second starting of oscillation capacitor C 17, crystal oscillator Y1, the first starting of oscillation resistance R 6, one end of the first starting of oscillation capacitor C 16, one end of crystal oscillator Y1, one end of the first starting of oscillation resistance R 6 is connected with communication microcontroller 21 pin, one end of the second starting of oscillation capacitor C 17, the other end of crystal oscillator Y1, the other end of the first starting of oscillation resistance R 6 is connected with communication microcontroller 22 pin, the other end of the first starting of oscillation capacitor C 16, the other end ground connection of the second starting of oscillation capacitor C 17, the first starting of oscillation capacitor C 16 adopts 4pF/16V ceramic disc capacitor, the second starting of oscillation capacitor C 17 adopts 4pF/16V ceramic disc capacitor, crystal oscillator Y1 adopts the 16.000MHz crystal oscillator of HC-49/US encapsulation, the first starting of oscillation resistance R 6 adopts 1MW/0.125W resistance, clock circuit is used for providing clock to microcontroller.
The course of work of the present invention is: USB interface is inserted into after usb host, and USB microcontroller is registered to usb host, and the Base Class code of registering is 02H, and communication apparatus completes the initialization to USB microcontroller SPI PORT COM and I/O mouth signal simultaneously; System is by CAN bus and LIN bus interface access fieldbus, and during access, communication microcontroller powers on, and completes the initialization of own SPI PORT COM and I/O mouth signal simultaneously.While having order to issue on usb host, first pass through USB interface transmission command to USB microcontroller, then the SPI PORT COM that USB microcontroller is isolated by photoelectricity is command routing to communication microcontroller, and communication microcontroller is converted to the signal in CAN bus or LIN bus by means of CAN interface circuit and LIN interface circuit order; While having data to upload in CAN bus or LIN bus, communication microcontroller gets by CAN interface circuit and LIN interface circuit the data that will upload, the arrival of the I/O pin proactive notification USB microcontroller new data of then isolating by photoelectricity, and by SPI PORT COM transfer of data to USB microcontroller, USB microcontroller is finally transferred to usb host data by USB interface.Clock circuit provides clock for communication microcontroller, and power circuit provides power supply for modules, and debug i/f circuit is for to USB microcontroller with communication microcontroller carries out on-line debugging and program writes.
Claims (1)
1. USB turns CAN/LIN gateway system, comprise USB microcontroller, communication microcontroller, CAN interface circuit, LIN interface circuit, connector circuit, photoelectric isolating circuit, debug i/f circuit, condition indication circuit, power circuit and clock circuit, it is characterized in that:
CAN interface circuit is connected with I/O mouth signal with the CAN PORT COM of communication microcontroller, LIN interface circuit is connected with the COM port signal of communication microcontroller, the USB of connector Circuits and Systems outside, CAN, LIN bus connects, photoelectric isolating circuit is connected with I/O mouth signal with the SPI PORT COM of communication microcontroller, be connected with I/O mouth signal with the SPI PORT COM of USB microcontroller, debug i/f circuit is connected with the debugging interface of USB microcontroller with the debugging interface of communication microcontroller, condition indication circuit is connected with the I/O mouth signal of communication microcontroller,
Described USB microcontroller adopts the chip that the model of Cypress company is CY7C64215-28PVXC;
Described communication microcontroller adopts the chip that the model of Freescale company is MC9S12C32CFA16;
Described CAN interface circuit comprises CAN bus transceiver chip U9, CAN bus transceiver chip U9 the 1st pin is connected with communication microcontroller 44 pin, CAN bus transceiver chip U9 the 2nd pin connects fieldbus ground, CAN bus transceiver chip U9 the 3rd pin is connected with 5V power supply, CAN bus transceiver chip U9 the 4th pin is connected with communication microcontroller 45 pin, CAN bus transceiver chip U9 the 5th pin is unsettled, CAN bus transceiver chip U9 the 6th pin, the 7th pin is connected with connector circuit, CAN bus transceiver chip U9 the 8th pin is connected with communication microcontroller 32 pin, described CAN bus transceiver chip U9 adopts the TJA1050 of NXP company,
Described LIN interface circuit comprises the first pull-up resistor R7, the second pull-up resistor R8, the first filter capacitor C15, the one LIN bus protection device N1, LIN bus physical layer chip U1, one end of the first pull-up resistor R7, LIN bus physical layer chip U1 the 5th pin is connected with communication microcontroller 39 pin, one end of the second pull-up resistor R8, LIN bus physical layer chip U1 the 6th pin is connected with communication microcontroller 38 pin, one end of the first filter capacitor C15, one end of the one LIN bus protection device N1 is connected with connector circuit, the other end of the first pull-up resistor R7, the other end of the second pull-up resistor R8, LIN bus physical layer chip U1 the 2nd pin, the 3rd pin is connected with 5V power supply, the other end of the first filter capacitor C15, the other end of the one LIN bus protection device N1, LIN bus physical layer chip U1 the 4th pin, the 8th pin, the 12nd pin, the 18th pin connects fieldbus ground, and LIN bus physical layer chip U1 the 16th pin is connected with VSUP power supply, LIN bus physical layer chip U1 the 1st pin, the 9th pin, the 10th pin, the 11st pin, the 13rd pin, the 14th pin, the 15th pin, the 17th pin, the 19th pin, the 20th pin is unsettled, and a described LIN bus protection device N1 adopts ON NUP1105L, LIN bus physical layer chip U1 adopts the MLX80001 chip of Melexis company,
Described connector circuit comprises the first build-out resistor R17, the second build-out resistor R18, the first connector LINCON, the second connector CANCON, the 3rd connector USBCON, one end of the first build-out resistor R17 is connected with the 3rd connector USBCON the 3rd pin, one end of the second build-out resistor R18 is connected with the 3rd connector USBCON the 4th pin, the first connector LINCON the 3rd pin is connected with LIN bus physical layer chip U1 the 7th pin, the first connector LINCON the 2nd pin, the second connector CANCON the 2nd pin connects fieldbus ground, the first connector LINCON the 1st pin, the second connector CANCON the 1st pin is connected with VBAT power supply, the second connector CANCON the 4th pin is connected with CAN bus transceiver chip U9 the 7th pin, the second connector CANCON the 2nd pin is connected with CAN bus transceiver chip U9 the 6th pin, the 3rd connector USBCON the 6th pin, the 5th pin, the 4th pin connects usb host ground, the 3rd connector USBCON the 1st pin is connected with 5V USB power supply, the other end of the first build-out resistor R17 is connected with USB microcontroller the 14th pin, the other end of the second build-out resistor R18 is connected with USB microcontroller the 15th pin,
Described photoelectric isolating circuit comprises the first current-limiting resistance R9, the second current-limiting resistance R11, the 3rd current-limiting resistance R13, the 4th current-limiting resistance R15, the first pull down resistor R10, the second pull down resistor R12, the 3rd pull down resistor R14, the 4th pull down resistor R16, the first optocoupler U4, the second optocoupler U5, the 3rd optocoupler U6, the 4th optocoupler U7, one end of the first current-limiting resistance R9 is connected with communication microcontroller the 12nd pin, the other end of the first current-limiting resistance R9 is connected with the A pin of the first optocoupler U4, one end of the second current-limiting resistance R11 is connected with communication microcontroller the 43rd pin, the other end of the second current-limiting resistance R11 is connected with the A pin of the second optocoupler U5, one end of the 3rd current-limiting resistance R13 is connected with USB microcontroller the 21st pin, the other end of the 3rd current-limiting resistance R13 is connected with the A pin of the 3rd optocoupler U6, one end of the 4th current-limiting resistance R15 is connected with USB microcontroller the 25th pin, the other end of the 4th current-limiting resistance R15 is connected with the A pin of the 4th optocoupler U7, one end of the first pull down resistor R10, the E pin of the first optocoupler U4 is connected with USB microcontroller the 23rd pin, one end of the second pull down resistor R12, the E pin of the second optocoupler U5 is connected with USB microcontroller the 4th pin, one end of the 3rd pull down resistor R14, the E pin of the 3rd optocoupler U6 is connected with communication microcontroller the 40th pin, one end of the 4th pull down resistor R16, the E pin of the 4th optocoupler U7 is connected with communication microcontroller the 41st pin, the other end of the first pull down resistor R10, the other end of the second pull down resistor R12, the K pin of the 3rd optocoupler U6, the K pin of the 4th optocoupler U7 connects usb host ground, the other end of the 3rd pull down resistor R14, the other end of the 4th pull down resistor R16, the K pin of the first optocoupler U4, the K pin of the second optocoupler U5 connects fieldbus ground, the C pin of the first optocoupler U4, the C pin of the second optocoupler U5 is connected with 5V USB power supply, the C pin of the 3rd optocoupler U6, the C pin of the 4th optocoupler U7 is connected with 5V power supply,
Described debug i/f circuit comprises the 3rd pull-up resistor R1, the 4th pull-up resistor R2, the 4th connector BDM, the 5th connector ISSP, the first button K1, one end of the 3rd pull-up resistor R1, the 4th connector BDM the 1st pin is connected with communication microcontroller 11 pin, one end of the 4th pull-up resistor R2, the 4th connector BDM the 4th pin, one end of the first button K1 is connected with communication microcontroller 17 pin, the 4th connector BDM the 2nd pin, another termination fieldbus ground of the first button K1, the 4th connector BDM the 3rd pin, the 5th pin is unsettled, the 4th connector BDM the 6th pin, the other end of the 3rd pull-up resistor R1, another termination 5V power supply of the 4th pull-up resistor R2, the 5th connector ISSP the 1st pin is connected with USB microcontroller 17 pin, the 5th connector ISSP the 2nd pin is connected with USB microcontroller 12 pin, the 5th connector ISSP the 3rd pin is unsettled, the 5th connector ISSP the 4th pin connects usb host ground, the 5th connector ISSP the 5th pin connects 5VUSB power supply,
Described condition indication circuit comprises the 5th current-limiting resistance R3, the 6th current-limiting resistance R4, the first indicator light R, the second indicator light G, the 5th current-limiting resistance R3 one end is connected with communication microcontroller 34 pin, the 5th current-limiting resistance R3 other end is connected with the first indicator light R negative electrode, the 6th current-limiting resistance R4 one end is connected with communication microcontroller 33 pin, the 6th current-limiting resistance R4 other end is connected with the second indicator light G negative electrode, and the first indicator light R anode, the second indicator light G anode connect 5V power supply;
Described power circuit comprises the second filter capacitor C1, the 3rd filter capacitor C2, the 4th filter capacitor C3, the 5th filter capacitor C4, the 6th filter capacitor C5, the 7th filter capacitor C6, the 8th filter capacitor C7, the 9th filter capacitor C8, the tenth filter capacitor C9, the 11 filter capacitor C10, the 12 filter capacitor C11, the first Schottky diode D1, the first direct current stabilizer U3, one end of the second filter capacitor C1, the anode of the 3rd filter capacitor C2, the negative electrode of the first Schottky diode D1, the first direct current stabilizer U3 the 1st pin connects VSUP power supply, one end of the 4th filter capacitor C3, the anode of the 5th filter capacitor C4, one end of the 6th filter capacitor C5, one end of the 7th filter capacitor C6, one end of the 8th filter capacitor C7, one end of the 9th filter capacitor C8, the first direct current stabilizer U3 the 3rd pin connects 5V power supply, one end of the tenth filter capacitor C9, a termination 5V USB power supply of the 11 filter capacitor C10, a termination VDD2.5 power supply of the 12 filter capacitor C11, the anode of the first Schottky diode D1 connects VBAT power supply, the other end of the second filter capacitor C1, the negative terminal of the 3rd filter capacitor C2, the other end of the 4th filter capacitor C3, the negative terminal of the 5th filter capacitor C4, the other end of the 6th filter capacitor C5, the other end of the 7th filter capacitor C6, the other end of the 8th filter capacitor C7, the other end of the 9th filter capacitor C8, the other end of the 12 filter capacitor C11, the first direct current stabilizer U3 the 4th pin connects fieldbus ground, the other end of the tenth filter capacitor C9, another termination usb host ground of the 11 filter capacitor C10,
Described clock circuit comprises the first starting of oscillation capacitor C 16, the second starting of oscillation capacitor C 17, crystal oscillator Y1, the first starting of oscillation resistance R 6, one end of one end of one end of the first starting of oscillation capacitor C 16, crystal oscillator Y1, the first starting of oscillation resistance R 6 is connected with communication microcontroller 21 pin, the other end of the other end of one end of the second starting of oscillation capacitor C 17, crystal oscillator Y1, the first starting of oscillation resistance R 6 is connected with communication microcontroller 22 pin, the other end ground connection of the other end of the first starting of oscillation capacitor C 16, the second starting of oscillation capacitor C 17.
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