Component Pin Classification

flux

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Searching datasheet info.

Looking for "List the module pins with pin numbers, pin names, and descriptions. Specifically identify strapping/bootstrap pins, input-only pins, pins connected to internal SPI flash/internal memory, and any USB-related pins." in esp-wroom-02u_esp-wroom-02d_datasheet_en.pdf

Looking for "Which pins are strapping pins or bootstrap pins on ESP-WROOM-02U? Include boot mode notes." in esp-wroom-02u_esp-wroom-02d_datasheet_en.pdf

Looking for "Which pins are connected to the internal SPI flash or internal memory on ESP-WROOM-02U? Include pin numbers and names." in esp-wroom-02u_esp-wroom-02d_datasheet_en.pdf

Looking for "Does ESP-WROOM-02U have any USB pins exposed? If not, say no. If yes, list them." in esp-wroom-02u_esp-wroom-02d_datasheet_en.pdf

From the ESP-WROOM-02U datasheet, here are the pin groups you asked for.
Bootstrap / strapping pins
The datasheet explicitly identifies these boot-related pins:

Table

Pin #Pin nameNotes
6IO15GPIO15 / MTDO / HSPICS / UART0_RTS - pull down
7IO2GPIO2 / UART1_TXD - floating (internal pull-up) or pull up
8IO0GPIO0 - UART download: pull down; Flash boot: floating or pull up
For normal flash boot, the extracted boot notes indicate the expected strap state is GPIO15 low, GPIO0 high, GPIO2 high or floating. For serial download mode, GPIO0 is held low during reset while GPIO15 stays low and GPIO2 stays high/floating.
Input-only pins
On the module pin list, the clearly input-only exposed pin is:

Table

Pin #Pin nameNotes
16TOUTADC/test input; used to test VDD3P3 or the TOUT input voltage, but those two functions cannot be used simultaneously
I do not see any other module pins explicitly described in the datasheet as input-only in the exposed 18-pin module pin table.
Pins connected to internal memory / SPI flash
For the module pins, there are no dedicated internal flash pins exposed in the 18-pin connector list. The datasheet says the module integrates 2 MB SPI flash, and the internal schematic shows the flash connected to the ESP8266EX with internal signals such as SD_DATA_0..3, SD_CMD, and SD_CLK, which are shown in the internal schematic rather than as exported module pins.
So the practical list is:

Table

CategoryExposed module pins
Internal flash / memory pinsNone explicitly exposed as module pins
If you want the closest related external SPI-capable pins, the datasheet lists HSPI on:
  • Pin 3 IO14 = HSPI_CLK
  • Pin 4 IO12 = HSPI_MISO
  • Pin 5 IO13 = HSPI_MOSI
  • Pin 6 IO15 = HSPICS
But those are interface pins, not the module's internal flash bus pins.
USB pins
There are no USB pins present. The datasheet-extracted pin list and interface table include UART, HSPI, I2C, I2S, IR, PWM, ADC, etc., but no USB interface or USB pins are listed.
If you want, I can turn this into a pin classification table for the whole part project, so you can tag each terminal with Bootstrap, Input, Communication, Power, Ground, etc.
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