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give me a basic connections
fenrrich

fenrrich

@copilot give me a basic connections
3y

copilot

To set up basic connections for the NRF52832-QFAB-R microcontroller (U1), you'll need to connect the following pins:
  1. VDD: Connect this pin to a 3.3V power supply.
  2. VSS: Connect this pin to the ground/0V.
  3. ~RESET: Connect to a pull-up resistor (10kΩ) to VDD to ensure proper operation. You can add a momentary normally open (NO) tact switch between this pin and ground if you want a reset button.
  4. P0.18/SWO: Optional - Connect this pin to the SWO pin of your debugging/programming adapter (e.g., a Segger J-LINK) for debugging.
  5. SWDIO: Connect this pin to the SWDIO pin of your debugging/programming adapter (e.g., a Segger J-LINK) for programming and debugging.
  6. SWDCLK: Connect this pin to the SWDCLK pin of your debugging/programming adapter (e.g., a Segger J-LINK) for programming and debugging.
  7. DEC1, DEC2, and DEC4: Connect decoupling capacitors (usually 100nF) between these pins and ground close to the IC.
  8. ANT: Connect this pin to a suitable 2.4GHz antenna for the wireless connectivity that the NRF52832 offers.
  9. P0.00/XL1 and P0.01/XL2: Connect a 32.768kHz crystal between these two pins, and a 12pF load capacitor from each pin to ground (refer to the datasheet for the exact load capacitor values needed for the specific crystal you're using).
  10. XC1 and XC2: Connect a 16MHz (or frequency specified in the datasheet) crystal between these two pins, and a load capacitor from each pin to ground (refer to the datasheet for the exact load capacitor values needed for the specific crystal you're using).
This will set up the core functionality of the NRF52832-QFAB-R. Other pins can be used for peripherals (e.g., SPI, I2C, UART) as per your project requirements.
3y
ecadpcb

ecadpcb

@copilot What cap descopuling recomend
3y

copilot

For the NRF52832-QFAB-R microcontroller, I recommend using 100nF (also known as 0.1uF) ceramic capacitors (X7R or X5R dielectric) for decoupling on the DEC1, DEC2, and DEC4 pins. These capacitors should be placed as close as possible to the respective pins and connected to the ground plane for optimal performance.
Additionally, it's also a good practice to add a bulk capacitor (typically 1uF to 10uF, ceramic or tantalum) on the VDD power supply line, close to the microcontroller. This bulk capacitor helps in providing stability to the power supply by buffering any transient voltage spikes or drops in the system.
3y
fenrrich

fenrrich

give me a part number suggestion for the 16MHz crystal
3y

copilot

I suggest using the Epson FA-128 16 MHz crystal (part number FA-128 16MHZ 10PF ±20ppm -20°C to +70°C). This crystal has a load capacitance of 10pF and offers good stability and performance for most applications. You can find this crystal at distributors like Digi-Key, Mouser, or Farnell/Newark. Please, check the availability and compatibility with your design before finalizing the part number.
3y
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