Decoupling Capacitors and Resistor Roles

flux

0:21

Here’s what each of those items is and does in your schematic:
  • 3V3: Power net portal indicating the 3.3 V rail. It ties any connected pins/components to the 3.3 V supply across the schematic.
  • C26: 0402 capacitor connected to NVCC_GPIO. Functions as a local decoupling/bulk cap to stabilize the NVCC_GPIO I/O supply against transients and switching noise.
  • C27: 0402 capacitor on NVCC_GPIO. Additional decoupling placed physically near other sinks of this rail to reduce impedance at higher frequencies.
  • R11: 0402 resistor between +3V3 and NVCC_GPIO. Likely a 0 Ω link (or small value) used as an isolate/jumper for measurement, filtering option, or to split planes for bring-up and fault isolation.
  • C24: 0402 capacitor on NVCC_GPIO. High-frequency bypass (typically 100 nF) close to NVCC_GPIO pins of the MCU to shunt fast transients to ground.
  • C29: 0603 capacitor on NVCC_GPIO. Likely a larger value (e.g., 1 µF–4.7 µF) to provide local bulk energy and reduce low-frequency droop on the I/O rail.
  • C23: 0603 or 0402 capacitor on NVCC_GPIO. Another decoupling/bulk element; together with C24/C25/C26/C27 it forms a distributed decoupling network covering a broader frequency range.
  • NVCC_GPIO_3V3: Power net portal labeling the NVCC_GPIO rail as a 3.3 V I/O supply domain for the MCU’s GPIO banks. This makes the I/O level 3.3 V and ties the various decouplers to that domain.
  • C25: 0402 capacitor on NVCC_GPIO. Another close-in high-frequency decoupler to minimize loop area and keep the rail quiet near sensitive pins.
In short: +3V3 is your main 3.3 V rail. NVCC_GPIO_3V3/NVCC_GPIO is the 3.3 V domain feeding the MCU’s I/O supply pins. R11 links +3V3 to NVCC_GPIO (optionally allowing isolation). C23, C24, C25, C26, C27, and C29 are the decoupling/bulk capacitors distributed around that rail to ensure stable, low-noise operation.
Clarify R11 value
Check capacitor values
Placement guidance
Rail separation decision
Noise/EMI concern
161 days
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    i.MX RT1010 LoRa Logger

    i.MX RT1010 LoRa Logger thumbnail
    This project is a LoRa data logger implementing the i.MX RT1010 microcontroller. It collects and logs data through the LoRa-E5 module and stores the data via a TF card. Capacitors and resistors are used to construct the necessary circuits, ensuring proper functionality. This system is ideal for long-distance, low-power IoT applications. #project #LoRa #RT1010 #SDCARD

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