Espressif Systems ESP32-WROOM-32UE - Page 8

PRE
LIMINARY
2. Pin Definitions
Note:
• Firmware can configure register bits to change the settings of ”Voltage of Internal LDO (VDD_SDIO)” and
”Timing of SDIO Slave” after booting.
• Internal pull-up resistor (R9) for MTDI is not populated in the module, as the flash and SRAM in ESP32-
WROOM-32UE only support a power voltage of 3.3 V (output by VDD_SDIO)
Espressif Systems 6 ESP32-WROOM-32UE User Manual V0.1
Bo
oting Mode
Pi
n
De
fault
SPI
Boot
Do
wnload Boot
GP
IO0
Pu
ll-up
1
0
GP
IO2
Pu
ll-down
Do
n’t-care
0
En
abling/Disabling Debugging Log Print over U0TXD During Booting
Pi
n
De
fault
U0
TXD Active
U0
TXD Silent
MT
DO
Pu
ll-up
1
0
Ti
ming of SDIO Slave
Pi
n
De
fault
Fa
lling-edge Sampling
Fa
lling-edge Output
Fa
lling-edge Sampling
Ri
sing-edge Output
Ri
sing-edge Sampling
Fa
lling-edge Output
Ri
sing-edge Sampling
Ri
sing-edge Output
MT
DO
Pu
ll-up
0
0
1
1
GP
IO5
Pu
ll-up
0
1
0
1