2
. Pin Definitions
Table 1: Pin Definitions
Name
No.
Type
Function
I34
1
I
GPIO34
I35
2
I
GPIO35
DBG_RXD/IO3
3
I/O
GPIO3, Debugging UART RX
DBG_TXD/IO0
4
I/O
GPIO1, Debugging UART TX
IO32
5
I/O
GPIO32
IO33
6
I/O
GPIO33
IO25
7
I/O
GPIO25
IO26
8
I/O
GPIO26
MTMS/IO14
9
I/O
GPIO14, MTMS
MTDI/IO12
10
I/O
GPIO12, MTDI
MTCK/IO13
11
I/O
GPIO13, MTCK
MTDO/IO15
13
I/O
GPIO15, MTDO
BOOT/IO0
14
I/O
GPIO0
IO4
15
I/O
GPIO4
IO2
16
I/O
GPIO2
IO5
17
I/O
GPIO5
IO20
18
I/O
GPIO20. See
under the table.
EN
19
I
High: On; enables the module
Low: Off; the module powers off
Note: Do not leave this pin floating.
VDD33
22
P
Power supply (3.0 V
~
3.6 V)
IO9
33
I/O
GPIO9. See
under the table.
IO10
34
I/O
GPIO10. See
under the table.
IO7
35
I/O
GPIO7. See
under the table.
IO8
36
I/O
GPIO8. See
under the table.
I36
38
I
GPIO36
I37
39
I
GPIO37
IO21
40
I/O
GPIO21
U1TXD/IO19
41
O
UART TX, connected to host RX, GPIO19
VDD33
43
P
Power supply (3.0 V
~
3.6 V)
U1RXD/IO22
45
I
UART RX, connected to host TX, GPIO22
I39
46
I
GPIO39
INT_B/IO27
47
O
Host interrupt, connected to host GPIO, GPIO27
I38
48
I
GPIO38
GND
12, 20, 21, 23
~
32,
37, 42, 44, 49
~
77
P
Ground
Note:
1. IO7/IO8/IO9/IO10/IO20 belong to VDD_SDIO power domain and cannot work when VDD_SDIO power shuts down.
2. For
peripheral
pin
configurations,
please
refer
to
.
Espressif Systems