If each of the schematic designs can carefully check the following ten points, it will improve the success rate of product design, reduce the number of changes and shorten the design cycle.
First, the power supply is the blood of the system, and we must sacrifice the cost. This is very good for the stability of products and through various certification.
1. as far as possible, use the type filter to increase the 10uH inductance, and each chip power pin must have 104 bypass capacitors.
2. use varistor or transient diode to suppress surge.
3. the mode electricity is separated from the electric current, and the large current and the small current loop are separated.
4. design should leave allowance, avoid power chip overheating, attack consumption reaches 50% of the rated value to use heat sink.
Two, enter IO remember to pull up
Three. Output IO remembers accounting driver capability
Four, high speed IO, too long wiring, 33 beat resistance suppression reflex.
Five, level matching between each chip
Six, is it necessary to avoid overshoot when switching transistors?
Seven. Single board has testable circuit, and can independently perform functional test.
Eight. There should be important signal test points and location
Nine, version identification
Ten. State indicator lamp
