source:Other information release time:2023-03-28 Hits: Popular:PCB Assembly company
(1) Fully consider the impact of power supply on the single -chip microcomputer. The power supply is done well, and the anti -interference of the entire circuit solves most of them. Many single -chip microcomputers are sensitive to the noise of the power supply. The filter circuit or regulator should be added to the single -chip electromechanical source to reduce the interference of the single -chip microcomputer. For example, magnetic beads and capacitors can be used to form π -shaped filter circuits. Of course, if the conditions are not high, you can also use a 100Ω resistor to replace the magnetic bead.
(2) If the I/O port of the single -chip microcomputer is used to control no noise devices such as motors, it should be isolated between the I/O port and the noise source (increase the π -shaped filter circuit). Controlling noise devices such as motors should be isolated between the I/O port and the noise source (increase the π -shaped filter circuit).
(3) Pay attention to the crystal PCB design wiring. The crystal and the single -chip machine are closer to the feet, and the clock is separated by the ground wire, and the crystal shell is grounded and fixed. This measure can solve many difficult problems.
(4) Reasonable partitions of the circuit board, such as strong, weak signals, numbers, simulation signals. Keep the interference source (such as motor, relay) from sensitive components (such as single -chip microcomputers).
(5) Digital area isolate the digital area with the simulation area, the digital land is separated from the simulation ground, and finally connects to the power site at a point. A/D, D/A chip PCB design wiring is also based on this, and the manufacturers have considered this requirement when the A/D and D/A chip pins are arranged.
(6) The ground wires of single -chip microcomputers and high -power devices should be ground alone to reduce mutual interference. Place high -power devices on the edge of the circuit board as much as possible.
(7) Use anti -interference elements such as magnetic beads, magnetic rings, and power filters, and shielding masks in key places such as single -chip microcomputer I/O port, power cord, circuit board connection cable, etc., which can significantly improve the anti -interference performance of the circuit.
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