Method for daisy chain communication circuit transmission current testing
A technology for transmitting current and communication circuits, which is applied in the field of daisy chain communication circuit transmission current testing, which can solve the problems of lack of evaluation methods for anti-interference ability, and achieve the effects of avoiding test damage, reducing test costs, and preventing current backflow
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[0024] (1) DC power V0 is preset to 30V, DC power V1 is preset to 0V, DC power V2 is preset to 30V, the maximum output of DC power V1 is 10V, R1 is 10K, the maximum output of DC power V2 is 50V, and R2 is 20K , R0 chooses 10K, D1 and D2 choose Schottky diodes, the conduction voltage drop is about 0.3V, and ammeters A1, A2, A3 and A4 choose 1mA range;
[0025] (2) Power on the DC power supplies V0, V1, and V3 in sequence;
[0026] (3) Record the indication values of the ammeters A2 and A3 after power-on, which are 58uA and 60uA respectively, which are the values of the current transmitted by the daisy chain from bottom to top and from top to bottom when the logic is low;
[0027] (4) Gradually adjust the output voltage of DC power supply V1 upwards. When V1 is adjusted to about 1.5V, the value of ammeter A1 is 120uA. At this time, the value of ammeter A2 changes from 58uA to 190uA. Record the value of A1 at this time by The flipping threshold current of the daisy chain inp...
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