docs(esp32): Updated wording to avoid misunderstanding

This commit is contained in:
Lv Xin Yue
2026-04-28 09:18:04 +08:00
parent 29f1e572b1
commit 475f9b6156
2 changed files with 13 additions and 3 deletions
@@ -90,6 +90,11 @@ This section provides an overview of compatibility issues that might occur when
- :ref:`sd_pull-up_no_pull-ups`
- :ref:`strapping_conflicts_dat2`
- ESP32-WROVER-E Series, including ESP32-WROVER-E and ESP32-WROVER-IE
- :ref:`sd_pull-up_no_pull-ups`
- :ref:`strapping_conflicts_dat2`
.. only:: esp32
@@ -306,9 +311,9 @@ No Pull-ups
MTDI (GPIO12) is used as a bootstrapping pin to select the output voltage of an internal regulator (VDD_SDIO) which powers the flash chip. This pin has an internal pull-down, so, if left unconnected, it will read low level at startup, which leads to selecting the default 3.3 V operation.
All ESP32-WROVER modules, excluding ESP32-WROVER-B, use 1.8 V flash and have internal pull-ups on GPIO12. Other modules that use 3.3 V flash have no pull-ups on the GPIO12 pin, and this pin is slightly pulled down internally.
For ESP32 modules that use 1.8 V flash (such as ESP32-WROVER and ESP32-WROVER-I), they have pull-up resistors on GPIO12. For ESP32 modules that use 3.3 V flash, they have no pull-up resistors on GPIO12, and this pin is slightly pulled down internally.
When adding a pull-up to this pin for SD card operation, consider the following:
When adding a pull-up to GPIO12 for SD card operation, consider the following:
- For boards that do not use the internal regulator (VDD_SDIO) to power flash, GPIO12 can be pulled high.
- For boards using 1.8 V flash chips, GPIO12 needs to be pulled high at reset. This is fully compatible with the SD card operation.