Comments on Does My Circuit Contain High-Speed Signals?
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Does My Circuit Contain High-Speed Signals?
My circuit includes the following components:
• PIC16 with internal clock, frequency: 32 MHz
• ST LED2000 LED driver (a buck converter) with a PWM dimming input. The converter itself isn't a concern regarding this question. I mentioned it only to give a clue for the PWM signal destination.
• TI BQ24070RHL battery charger
• LED controlled via PWM by the microcontroller.
My question:
Do the following signals qualify as high-speed?
I’m asking this to determine whether I need to ensure a proper return path for them and/or maintain large spacing between them. If not, can I ignore the return path considerations?
Key signals I believe require attention:
- Charger outputs – These are open-drain outputs. These outputs are connected to the microcontroller inputs (with internal PU). I couldn't find rise/fall time specifications in the datasheet.
- PWM outputs from the microcontroller – Base frequency: 200–500 Hz.
One output goes to the LED driver (possibly with or without a pull-down resistor).
Another output drives an LED.
- Push button with a pull-down resistor, connected to a microcontroller input.
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