Checkpoint LAB USB-RS232 Manuel d'utilisateur télécharger pdf (Page 23)

Step 2. Input Output Device Advice

1. Impedance matching to your control electronics

Outputs

• GPIO Logic (V

and I

) converted to either a lower or higher power range

• DAC (Vcc) active range to either a lower or higher power range

Inputs

• GPIO Logic (CMOS gate impedance and protective devices)

• ADC (Vcc) active range

2. The basics! Apply to Thevenin Equivalent Circuits

• Source electronics – Input interface

• Device being driven – Output interface

• R, RL, RC, RLC loads (& potential for unwanted current and voltage

spikes)

STEP 5. NOISE IMMUNITY

HOW DOES NOISE GET INTO ELECTRONICS?

• ground connections and loops

• power supply connections

• high impedance signal inputs

• inadvertent ESD

• (human touch, lightning)

• Reverse current surges via inductive devices

(motors, solenoids, inductive devices)

• rf emissions

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Checkpoint LAB USB-RS232 Manuel d'utilisateur Page 23