Name

No.

Type

Function

CAP1

48

I

Connects to a 10 nF series capacitor to ground

GND

49

P

Ground

Note:

• The pin-pin mapping between ESP32-D2WD/ESP32-U4WDH and the embedded flash is as follows: GPIO16 = CS#, GPIO17 = IO1/DO, SD_CMD = IO3/HOLD#, SD_CLK =

CLK, SD_DATA_0 = IO2/WP#, SD_DATA_1 = IO0/DI. The pins used for embedded flash are not recommended for other uses.

• In most cases, the data port connection between ESP32 series of chips other than ESP32-D2WD/ESP32-U4WDH and external flash is as follows: SD_DATA0/SPIQ = IO1/DO,

SD_DATA1/SPID = IO0/DI, SD_DATA2/SPIHD = IO3/HOLD#, SD_DATA3/SPIWP = IO2/WP#.

• For a quick reference guide to using the IO_MUX, Ethernet MAC, and GIPO Matrix pins of ESP32, please refer to Appendix ESP32 Pin Lists.