Safety grating receiver and single D trigger pipeline chip selection circuit

Abstract

The utility model provides a safety grating receiver and single D trigger pipeline chip selection circuit, which comprises an MCU, a grating light receiver, a single D trigger, receiving lamp beads, an analog switch and an expansion board, which are electrically connected on a PCB (Printed Circuit Board), the single D trigger is provided with an SN74LVC1G175DBV chip, the chip of the analog switch is MC14051B, the MCU controls address pins A, B or C to select one of the eight receiving lamp beads, and the expansion board is electrically connected with the MCU, the grating light receiver, the single D trigger, the receiving lamp beads, the analog switch and the expansion board. A single D trigger SN74LVC1G175DBV chip is adopted to drive an analog switch MC14051B chip, the number of PCB circuit board elements, the hardware cost and the occupied area of the elements are greatly reduced, the number of pin headers when expansion boards are spliced is reduced, the EMC is greatly improved, and PCB layout and wiring of expansion board hardware are more convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of LED lamps, in particular to a safety grating receiver and a single D flip-flop serial chip select circuit. Background Technique

[0002] With the characteristics of green environmental protection and high efficiency, LED lamps are widely used in lighting applications in various occasions. At present, when receiving infrared running light sequence signals, 74HC164 (8-channel D flip-flop) and MC14051 (8-channel analog switch) are adopted. 74HC164 selects MC14051, and MC14051 selects one of the 8 channels through address signals A / B / C to drive the corresponding LED lamp, so as to realize the function of receiving running light signals. However, it has the following disadvantages:

[0003] Disadvantage 1: The cost of 74HC164 (8-channel D flip-flop) is high.

[0004] Disadvantage 2: 74HC164 (8-channel D flip-flop) has a large volume, which is not conducive to the layout and wiring of the PCB board. Summary of the Invention

[0005] The utility model provides a safety grating receiver and a single D flip-flop serial chip select circuit, which uses an MCU to control the address pins A, B or C of the current to select one of the 8 receiving lamp beads. SN74LVC1G175DBV is a single D flip-flop with an SOP23-6 package, which has a small volume, simple control and low cost, and well solves the PCB layout and wiring of the expansion board hardware and cost control.

[0006] To solve the above problems, the utility model provides a safety grating receiver and a single D flip-flop serial chip select circuit, which includes an MCU, a grating photoreceptor, a single D flip-flop, receiving lamp beads, an analog switch and an expansion board, and are electrically connected on a PCB circuit board. The single D flip-flop is provided with an SN74LVC1G175DBV chip, the chip of the analog switch is MC14051B, and the MCU controls the address pins A, B or C of the current to select one of the 8 receiving lamp beads.

[0007] Further, the SN74LVC1G175DBV chip is used to select the MC14051B chip of the analog switch, and each expansion board is paired with an SN74LVC1G175DBV chip of the single D flip-flop.

[0008] Further, the output pin of the SN74LVC1G175DBV chip is connected to the chip select pin of the MC14051B chip of the analog switch, and the low level is valid.

[0009] Further, all the clock pins CLK of the SN74LVC1G175DBV chip are electrically connected together and controlled by the MCU.

[0010] Further, the data input pin D of the SN74LVC1G175DBV chip on the first expansion board is connected to the IO pin of the MCU, and the output of the SN74LVC1G175DBV chip on the first expansion board is connected to the input of the SN74LVC1G175DBV chip on the next expansion board, thereby associating all the expansion board signals.

[0011] Further, after the grating receiver is powered on, the MCU software will perform a reset operation for the whole machine, and all the expansion boards are in the disabled state. At this time, the outputs of all the single D flip-flop SN74LVC1G175DBV chips on all the expansion boards are all high level, and the corresponding analog switch MC14051B chips are in the disabled state.

[0012] Further, for the SN74LVC1G175DBV - PIN1: CLK is the clock input pin. When a rising edge is input on this pin, the chip saves the data of the PIN3 data pin D into the register.

[0013] Further, for the SN74LVC1G175DBV - PIN2: D is the data input pin. When a rising edge occurs on the PIN1 clock pin CLK, the value of this pin is saved into the internal register.

[0014] Further, for the SN74LVC1G175DBV - PIN2: MR# is the register reset pin. When it is at a low level, the register is reset and the output is 0.

[0015] Further, the single D flip - flop SN74LVC1G175DBV chip is packaged in SOP23 - 6.

[0016] The beneficial effects of the present utility model are as follows: A safety grating receiver and a single D flip - flop serial chip select circuit, including an MCU, a grating light receiver, a single D flip - flop, a receiving light bead, an analog switch, and an expansion board, and are electrically connected on a PCB circuit board. The single D flip - flop is provided with an SN74LVC1G175DBV chip, and the chip of the analog switch is MC14051B. The MCU controls the flow control address pins A, B, or C to select one of the 8 receiving light beads. The SN74LVC1G175DBV is a single D flip - flop, packaged in SOP23 - 6, with a small volume, simple control, and low cost. The PCB layout and wiring of the expansion board hardware, as well as cost control, are well solved. The main advantages are as follows:

[0017] 1. Change the 8-channel D flip-flop to a 1-channel D flip-flop to reduce costs, the component volume, and the number of accessory components.

[0018] 2. Directly reduce the number of drive signals to improve stability and reduce the difficulty of software design.

[0019] 3. Use a single D flip-flop SN74LVC1G175DBV chip to drive the analog switch MC14051B chip, which greatly reduces the number of board components, the hardware cost, and the occupied area of the components, reduces the number of pin feet of the pin headers when the expansion boards are spliced, and greatly improves the EMC.

[0020] 4. Solve the limitation of the expansion of the number of light beads on the expansion board, which provides great convenience for software design and production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the circuit diagram of the safety grating light receiver of the present utility model and the single D flip-flop cooperating with the analog switch to realize the serial-in parallel-out demultiplexer.

[0022] Figure 2 It is the schematic diagram of the PCB circuit board of the present utility model.

[0023] REFERENCE SIGNS

[0024] 1. PCB circuit board; 2. Receiving light beads; 3. Single D flip-flop; 4. Analog switch MC14051B chip. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] In order to more fully understand the technical content of the present utility model, the technical solutions of the present utility model will be further introduced and described below in conjunction with the drawings and specific embodiments, but not limited thereto.

[0026] As Figure 1 and Figure 2 shown, in the specific embodiment of the present utility model, a safety grating receiver and a single D flip-flop serial-in parallel-out demultiplexer circuit are provided, which includes an MCU, a grating light receiver, a single D flip-flop 3, receiving light beads 2, an analog switch, and an expansion board, and are electrically connected on the PCB circuit board 1. The single D flip-flop 3 is provided with an SN74LVC1G175DBV chip, and the chip of the analog switch is MC14051B. The MCU controls the flow control address pins A, B, or C to select one of the eight receiving light beads 2.

[0027] Furthermore, the SN74LVC1G175DBV chip is used to select the analog switch MC14051B chip, and each expansion board is paired with an SN74LVC1G175DBV chip of a single D flip-flop 3.

[0028] Further, the output pin of the SN74LVC1G175DBV chip is connected to the chip select pin of the MC14051B chip of the analog switch, and it is active low.

[0029] Further, all the clock pins CLK of the SN74LVC1G175DBV chips are electrically connected together and controlled by the MCU.

[0030] Further, the data input pin D of the SN74LVC1G175DBV chip on the first expansion board is connected to the IO pin of the MCU, and the output of the SN74LVC1G175DBV chip on the first expansion board is connected to the input of the SN74LVC1G175DBV chip on the next expansion board, thus correlating all the expansion board signals.

[0031] Further, after the grating receiver is powered on, the MCU software will perform a reset operation for the whole machine, and all the expansion boards are in the disabled state. At this time, the outputs of all the SN74LVC1G175DBV chips of the single D flip-flop 3 on all the expansion boards are all high level, and the corresponding analog switch MC14051B chips are in the disabled state.

[0032] Further, for SN74LVC1G175DBV - PIN1: CLK is the clock input pin. When a rising edge is input on this pin, the chip saves the data of the PIN3 data pin D into the register.

[0033] Further, for SN74LVC1G175DBV - PIN2: D is the data input pin. When a rising edge occurs on the PIN1 clock pin CLK, the value of this pin is saved into the internal register.

[0034] Further, for SN74LVC1G175DBV - PIN2: MR# is the register reset pin. When it is at a low level, the register is reset and the output is 0.

[0035] As Figure 1 shown: SN74LVC1G175DBV is a single D flip - flop 3, with an SOP23 - 6 package, small size, simple control, low cost, and it well solves the PCB layout and wiring of the expansion board hardware, as well as cost control.

[0036] SN74LVC1G175DBV - PIN1: CLK, the clock input pin. When a rising edge is input on this pin, the chip saves the data of the PIN3 data pin D into the register.

[0037] SN74LVC1G175DBV - PIN2: GND, the negative power reference.

[0038] SN74LVC1G175DBV - PIN2: D, data input pin. When the clock pin CLK at PIN1 rises, the value of this pin is saved into the internal register.

[0039] SN74LVC1G175DBV - PIN2: Q, data output pin.

[0040] SN74LVC1G175DBV - PIN2: VCC, positive power supply.

[0041] SN74LVC1G175DBV - PIN2: MR#, register reset pin. When it is at low level, the register is reset and the output is 0. When the safety light curtain receiver expansion board works normally, each receiving LED 2 on each expansion board needs to be individually chip - selected. There is an analog switch MC14051B chip on each expansion board. When enabling this chip, the current expansion board is in the receiving state, and the MCU then selects one of the 8 receiving LEDs 2 by controlling its address pins A, B, and C.

[0042] The SN74LVC1G175DBV chip of single D - type flip - flop 3 is used to select the analog switch MC14051B chip. There is a paired SN74LVC1G175DBV chip of single D - type flip - flop 3 on each expansion. The output pin of this chip is connected to the chip - select pin of the analog switch MC14051B chip, with low - level validity. Therefore, only by controlling the output of the SN74LVC1G175DBV chip of single D - type flip - flop 3 to be at low level can the currently working expansion board be selected. The clock pins CLK of all SN74LVC1G175DBV chips of single D - type flip - flop 3 are all connected together and controlled by the MCU. The data input pin D of the SN74LVC1G175DBV chip of single D - type flip - flop 3 on the first expansion board is connected to the IO pin of the MCU, and the output of the SN74LVC1G175DBV chip of single D - type flip - flop 3 on the first expansion board is connected to the input of the SN74LVC1G175DBV chip of single D - type flip - flop 3 on the next expansion board, thus associating all the expansion board signals.

[0043] After the grating receiver is powered on, the MCU software will perform a reset operation on the whole machine, and all expansion boards are in the disabled state. At this time, the outputs of all SN74LVC1G175DBV chips of the single D flip-flop 3 on all expansion boards are all high level, and the corresponding analog switch MC14051B chips are in the disabled state. After normal operation, after the MCU completes the receiving operation of the main board, it will output a low level on the corresponding IO pin connected to the data input pin D of the SN74LVC1G175DBV chip of the single D flip-flop 3 on the first expansion board, and output a rising edge signal on the IO pin connected to the clock pin CLK of all SN74LVC1G175DBV chips of the single D flip-flop 3 on all expansion boards. In this way, the output pin of the SN74LVC1G175DBV chip of the single D flip-flop 3 on the first expansion board outputs a low level, and the analog switch MC14051B chip on the first expansion board is in the selected state, and the first expansion board works. When it is necessary to select the subsequent expansion board, the MCU outputs a high level on the IO corresponding to the data pin D and outputs a rising edge on the IO corresponding to the CLK pin. At this time, the low level output of the expansion board will move to the next expansion board, and the analog switch MC14051B chip of the next expansion board will be selected. It includes MCU, grating photoreceiver, single D flip-flop 3, receiving lamp beads 2, analog switch and expansion board, and is electrically connected on the PCB circuit board 1. The single D flip-flop 3 is equipped with an SN74LVC1G175DBV chip, and the chip of the analog switch is MC14051B. The MCU controls the flow control address pins A, B or C to select one of the 8 receiving lamp beads 2. SN74LVC1G175DBV is a single D flip-flop 3, with an SOP23-6 package, small size, simple control, low cost, and has well solved the PCB layout and wiring of the expansion board hardware, as well as cost control. It has the following main advantages:

[0044] 1. Change the 8-channel D flip-flop to a 1-channel D flip-flop, reduce costs, reduce the volume of components and the number of accessory components;

[0045] 2. Directly reduce the number of drive signals, improve stability and reduce the difficulty of software design;

[0046] 3. Use the SN74LVC1G175DBV chip of the single D flip-flop 3 to drive the analog switch MC14051B chip, which greatly reduces the number of board components, hardware costs, and the occupied area of components, reduces the number of pin pins when the expansion boards are spliced, and greatly improves the EMC;

[0047] 4. Solve the limitation of the expansion of the number of lamp beads on the expansion board, and provide great convenience for software design and production.

[0048] The above is only the preferred embodiment of this patent, and does not limit the scope of this patent. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings, directly or indirectly applied in other related technical fields, shall fall within the protection scope of this patent.

Claims

1. A safety grating receiver and a single D flip-flop pipeline chip select circuit, characterized in that: It includes an MCU, a grating light receiver, a single D trigger, a receiving lamp bead, an analog switch and an expansion board, and is electrically connected on a PCB circuit board. The single D trigger is provided with a SN74LVC1G175DBV chip, the analog switch chip is MC14051B, and the MCU controls the flow control address pin A, B or C to select one of the eight receiving lamp beads.

2. The safety grating receiver and single D flip-flop pipeline chip select circuit as claimed in claim 1, characterized in that: The SN74LVC1G175DBV chip is used to select the analog switch MC14051B chip, and each expansion board is paired with a SN74LVC1G175DBV chip of the single D trigger.

3. The safety grating receiver and single D flip-flop pipeline chip select circuit as claimed in claim 1, characterized in that: The output pin of the SN74LVC1G175DBV chip is connected to the chip select pin of the MC14051B chip of the analog switch, and the low level is effective.

4. The safety grating receiver and single D flip-flop pipeline chip select circuit as claimed in claim 1, characterized in that: The clock pins CLK of the SN74LVC1G175DBV chip are all electrically connected together and controlled by the MCU.

5. The safety grating receiver and single D flip-flop pipeline chip select circuit as claimed in claim 1, characterized in that: The SN74LVC1G175DBV chip is connected to the IO pin of the MCU at the data input pin D of the first expansion board, and the output of the SN74LVC1G175DBV chip on the first expansion board is connected to the input of the SN74LVC1G175DBV chip on the next expansion board, thereby associating all expansion board signals.

6. The safety grating receiver and single D flip-flop pipeline chip select circuit as claimed in claim 1, characterized in that: After the grating receiver is powered on, the MCU software will perform a whole machine reset operation, all expansion boards are in a disabled state, the outputs of the single D trigger SN74LVC1G175DBV chips on all expansion boards are all high level, and the corresponding analog switch MC14051B chip is in a disabled state.

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