Extra symbol terminals 54–61
- Datasheet defines the module as 53 pins total.
- Valid GND pins are 1, 2, 11, 14, 36–53.
- The project appears to also include GND terminals 54–61, which are not in the datasheet pin table.
- Recommended fix: remove pins 54–61 unless they intentionally represent extra footprint-only exposed/thermal pads. If they are footprint-only pads, document them clearly and ensure they are not exposed as normal schematic pins.
Symbol pin electrical types are too generic
- All terminals appear to use Pin Type: Unspecified.
- Datasheet defines:
3V3 as power supplyGND as powerEN as input- GPIO/UART pins as
I/O/T
- NC pins as no-connect
- Recommended fix: set proper electrical pin metadata for ERC quality:
3V3: Power inputGND: Ground / powerEN: InputIOx, RXD0, TXD0: Bidirectional / tri-state where supportedNC: No-connect / excluded terminal
Key metadata appears incomplete
- MPN and LCSC number were inferable but not clearly present as standalone metadata.
- Recommended fix: explicitly add:
- Manufacturer: Espressif Systems
- MPN: ESP32-C3-MINI-1-H4
- LCSC Part Number: C2935306
- Lifecycle note: NRND per current Espressif datasheet
- Flash: 4 MB Quad SPI
- Operating temp: –40 °C to +105 °C
- Supply: 3.0–3.6 V, 3.3 V nominal
- Required supply current capability: ≥ 0.5 A
Footprint/pad mapping could not be fully verified from accessible data
- The footprint asset exists as
ESP32C3MINI1H4.kicad_mod, but the current project context did not expose a full pad-by-pad coordinate/pin map.
- Datasheet land pattern expects the ESP32-C3-MINI-1 53-pin module pattern, including antenna keepout and multiple GND pads.
- Recommended fix: manually verify the footprint pad numbers against datasheet pins 1–53, especially:
- Pin 1 orientation
- 3V3 = pad 3
- EN = pad 8
- IO18/IO19 = pads 26/27 for USB D−/D+
- RXD0/TXD0 = pads 30/31
- GND pads 36–53
- No pads numbered 54–61 unless intentionally added as non-symbol mechanical/ground pads
Documentation should mention ESP32-C3 boot strapping
- Important pins: GPIO2, GPIO8, GPIO9
- GPIO9 has weak pull-up and is commonly used for BOOT.
- GPIO8/GPIO9 combinations matter for USB/JTAG download.
- Recommended fix: add usage notes warning designers not to load strapping pins incorrectly at reset.