ESP32 Part Review
Thought for 21 sec
I’ll update the terminal metadata from Espressif Table 3-2: pin descriptions, electrical pin types, and broad sections, while marking the extra 33–40 pads as EPAD/GND subdivisions since they are not separate datasheet pins.
Worked for 1 min 33 sec
Metadata is ready to apply: I’ll use broad, single functional sections per pin and preserve the current 40-terminal structure by documenting pins 33–40 as non-datasheet EPAD/GND subdivisions.
Worked for 2 mins 43 sec
Updated and verified all 40 terminal records with datasheet-backed Pin Description, Pin Type, and Section metadata.
Open items:
- Pins 33–40 are still modeled as extra terminals; I documented them as non-datasheet EPAD/GND subdivisions that should belong electrically to pin 29.
- Pin 29 is still named
GND_3; its description now identifies it asEPAD.
Suggested next steps:
- Collapse pads 33–40 into pin 29 EPAD/GND in the footprint mapping.
- Rename
GND_3toEPADorEPAD/GND. - Re-run a final part quality check after the pin model is corrected.
Fix model and review
Fix EPAD mapping
Rename pin 29
Run quality check
Update review file
Refine this doc
Ask about this doc
Part Datasheet Review — ESP32-C5-WROOM-1U-N8R8
Date: 2026-07-14
Scope
Reviewed available part metadata, schematic terminals, footprint pad definitions, and pin descriptions for the Flux part project
ESP32-C5-WROOM-1U-N8R8 against the official Espressif datasheet.Sources
- Official datasheet used for verification: https://documentation.espressif.com/esp32-c5-wroom-1_wroom-1u_datasheet_en.pdf
- Official HTML datasheet page: https://documentation.espressif.com/esp32-c5-wroom-1_wroom-1u_datasheet_en.html
- Existing part Datasheet URL found in project metadata: https://www.digikey.com/en/products/detail/espressif-systems/ESP32-C5-WROOM-1U-N8R8/27566801
Note: A Datasheet URL was already present, so the conditional “if no datasheet URL is already set” did not apply. The existing URL points to the DigiKey product page rather than the direct official Espressif PDF.
Current Flux Part Metadata Found
Table
| Field | Current value |
|---|---|
| Manufacturer Part Number | ESP32-C5-WROOM-1U-N8R8 |
| Manufacturer Name | Espressif |
| Datasheet URL | DigiKey product page URL |
| Package or Case Code | Module |
| Part Type | Integrated Circuits |
| Mount | Surface Mount |
| Designator Prefix | IC |
| Schematic terminals | 40 terminals, pin numbers 1–40 |
| Footprint | ESP32C5WROOM1UN8R8.kicad_mod |
| 3D model | ESP32-C5-WROOM-1U-N8R8.stp |
Key Datasheet Specs
Table
| Spec | Datasheet value |
|---|---|
| Module family | ESP32-C5-WROOM-1U |
| Specific ordering code | ESP32-C5-WROOM-1U-N8R8 |
| Embedded chip | ESP32-C5HR8 |
| Flash | 8 MB Quad SPI |
| PSRAM | 8 MB Quad SPI |
| Wireless | Wi-Fi 6 dual-band, Bluetooth LE, IEEE 802.15.4 / Thread / Zigbee support |
| Supply voltage | 3.0 V to 3.6 V operating range |
| Ambient temperature | -40 °C to +85 °C |
| Module size | 18.0 mm × 21.2 mm × 3.3 mm |
| Antenna | External antenna connector version; ANT2 RF pad is disabled by default unless arranged with Espressif |
| Electrical module pin count | 32 pins |
Datasheet Pin Table — ESP32-C5-WROOM-1U
Table
| No. | Name | Type | Function summary |
|---|---|---|---|
| 1 | GND | P | Ground |
| 2 | 3V3 | P | Power supply |
| 3 | EN | I | Chip enable; do not leave floating |
| 4 | IO2 | I/O/T | GPIO2, MTMS, LP_GPIO2, LP_UART_RTSN, LP_I2C_SDA, ADC1_CH1, FSPIQ |
| 5 | IO3 | I/O/T | GPIO3, MTDI, LP_GPIO3, LP_UART_CTSN, LP_I2C_SCL, ADC1_CH2 |
| 6 | IO0 | I/O/T | GPIO0, XTAL_32K_P, LP_GPIO0, LP_UART_DTRN |
| 7 | IO1 | I/O/T | GPIO1, XTAL_32K_N, LP_GPIO1, LP_UART_DSRN, ADC1_CH0 |
| 8 | IO6 | I/O/T | GPIO6, LP_GPIO6, ADC1_CH5, FSPICLK |
| 9 | IO7 | I/O/T | GPIO7, FSPID, SDIO_DATA1 |
| 10 | IO8 | I/O/T | GPIO8, PAD_COMP0, SDIO_DATA0 |
| 11 | IO9 | I/O/T | GPIO9, PAD_COMP1, SDIO_CLK |
| 12 | IO10 | I/O/T | GPIO10, FSPICS0, SDIO_CMD |
| 13 | IO13 | I/O/T | GPIO13, USB_D-, SDIO_DATA3 |
| 14 | IO14 | I/O/T | GPIO14, USB_D+, SDIO_DATA2 |
| 15 | IO28 | I/O/T | GPIO28 |
| 16 | IO5 | I/O/T | GPIO5, MTDO, LP_GPIO5, LP_UART_TXD, ADC1_CH4, FSPIWP |
| 17 | IO4 | I/O/T | GPIO4, MTCK, LP_GPIO4, LP_UART_RXD, ADC1_CH3, FSPIHD |
| 18 | IO27 | I/O/T | GPIO27 |
| 19 | NC/IO15 | I/O/T | SPICS1, GPIO15; unavailable as GPIO on modules with in-package SPI PSRAM |
| 20 | NC | — | Not connected |
| 21 | IO23 | I/O/T | GPIO23 |
| 22 | NC | — | Not connected |
| 23 | IO24 | I/O/T | GPIO24 |
| 24 | RX0 | I/O/T | U0RXD, GPIO12 |
| 25 | TX0 | I/O/T | U0TXD, GPIO11 |
| 26 | IO25 | I/O/T | GPIO25 |
| 27 | IO26 | I/O/T | GPIO26 |
| 28 | GND | P | Ground |
| 29 | EPAD | P | Exposed pad / ground |
| 30 | GND | P | Ground |
| 31 | ANT2 | I/O | RF input/output; 50 ohm impedance control recommended if used |
| 32 | GND | P | Ground |
Cross-Check Results
Symbol / Terminal Model
Table
| Check | Result |
|---|---|
| Pins 1–28 names | Match datasheet names and numbering. |
| Pin 29 | Current symbol names it GND_3; datasheet names it EPAD with ground function. This is functionally ground but semantically mislabeled. |
| Pins 30–32 | Match basic functions: GND, ANT2, GND. |
| Pins 33–40 | Mismatch: datasheet has no module pins 33–40. Current part exposes GND_6 through GND_13 as schematic terminals. |
| Pin descriptions | Missing / not populated; all inspected terminals lack datasheet-backed descriptions. |
| Pin types | All inspected terminals are Unspecified; datasheet provides P/I/I-O-T roles. |
Footprint
Table
| Check | Result |
|---|---|
| Module outline | Footprint fab outline is 18.0 mm × 21.2 mm, matching datasheet nominal module size. |
| Edge pad pitch / size | Edge pads use 1.27 mm pitch and 0.9 mm × 1.5 mm land size, consistent with datasheet land-pattern values. |
| Pad count / pad numbering | Footprint contains 40 physical pad objects. Datasheet defines 32 electrical module pins. |
| Central ground/thermal area | Extra central 1.3 mm square pads may be a legitimate split implementation of the EPAD land, but they should map electrically to pin 29, not to independent pins 33–40. |
| ANT2 | Pad 31 is present and should be treated as a 50 ohm RF pad if used; datasheet notes ANT2 is disabled by default unless arranged with Espressif. |
Mismatches / Issues Flagged
-
High severity — 40 schematic terminals vs 32 datasheet pins
The Flux part exposes pins 33–40 as independent GND terminals, but the official Espressif datasheet states ESP32-C5-WROOM-1U has 32 pins and Table 3-2 stops at pin 32. -
High severity — footprint pad mapping likely wrong for EPAD split pads
The additional central copper shapes may be valid physical EPAD subdivisions, but they should be tied to the single electrical pin 29EPAD/GND, not modeled as separate pins 33–40. -
Medium severity — pin 29 naming
Pin 29 should be namedEPADorEPAD/GND; currentGND_3loses the exposed-pad meaning. -
Medium severity — terminal pin types missing
All terminals areUnspecified. Datasheet-backed types should be assigned: power for3V3, ground/power for GND/EPAD, input for EN, bidirectional for GPIOs, RF/passive for ANT2, and NC/no-connect for NC pins. -
Medium severity — pin descriptions missing
Pin descriptions should be populated from Table 3-2 so users see alternate functions and constraints, especially EN, NC/IO15, USB D-/D+, UART, and ANT2. -
Low severity — Datasheet URL property quality
The part has a Datasheet URL set, but it points to a DigiKey product page rather than the direct official Espressif PDF. The official PDF URL should be preferred for long-term part quality.
Recommended Fixes
- Reduce the user-visible schematic terminal count to the 32 datasheet pins.
- Rename pin 29 to
EPADorEPAD/GND. - If the footprint keeps the nine central thermal/ground copper shapes, map every central EPAD subdivision to electrical pin 29 instead of exposing pins 33–40.
- Populate pin descriptions from Table 3-2.
- Set pin types from the datasheet.
- Prefer the official Espressif datasheet PDF URL for the part Datasheet URL property.
Final Assessment
The part is not fully datasheet-consistent as currently modeled. The first 32 electrical pins are mostly correct, but pins 33–40 should not be exposed as independent module pins. The footprint geometry may be physically acceptable if those central pads are EPAD subdivisions, but the schematic symbol and symbol-to-footprint pin mapping need correction before this part should be considered production-quality.
Scope
Sources
Current Flux Part Metadata Found
Key Datasheet Specs
Datasheet Pin Table — ESP32-C5-WROOM-1U
Cross-Check Results
Symbol / Terminal Model
Footprint
Mismatches / Issues Flagged
Recommended Fixes
Final Assessment
