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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 • TI BQ24070RHL battery charger ...
#3: Post edited
by
Olin Lathrop
·
2025-02-04T18:35:29Z (1 day ago)
Enough with the annoying fluff! This is now the second time I had to edit it out. Read the rules already!
- 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**
- • **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:**
- 1. **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.
- 2. **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.
3. **Push button** with a pull-down resistor, connected to a microcontroller input.Thanks in advanced for any answer,Eyal
- 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**
- • **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:**
- 1. **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.
- 2. **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.
- 3. **Push button** with a pull-down resistor, connected to a microcontroller input.
#2: Post edited
by
Eyal78
·
2025-02-04T10:41:53Z (1 day ago)
- 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**
- • **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:1. 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.2. 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.
3. Push button with a pull-down resistor, connected to a microcontroller input.- Thanks in advanced for any answer,
- Eyal
- 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**
- • **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:**
- 1. **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.
- 2. **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.
- 3. **Push button** with a pull-down resistor, connected to a microcontroller input.
- Thanks in advanced for any answer,
- Eyal
#1: Initial revision
by
Eyal78
·
2025-02-04T10:37:06Z (1 day ago)
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** • **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: 1. 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. 2. 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. 3. Push button with a pull-down resistor, connected to a microcontroller input. Thanks in advanced for any answer, Eyal