Schematics

1
1
2
2
3
3
4
4
D D
C C
B B
A A
GND
GNDGND
1
2
ANT
GND
3.3V
GND
GPIO16
NRST
GPIO14 GPIO12 GPIO13 GPIO15 GPIO2 GPIO0 GPIO4
SD_D2
SD_D3
SD_CMD
SD_CLK
SD_D0
SD_D1
GPIO5
RXD0 TXD0
GNDGND
GND
GND
SD_D2
SD_D3
SD_CMD
SD_CLK
SD_D0
SD_D1
GND
GND
GND
GND
CHIP_EN
GND
GND
1
GND
2
S1
shield
GND
1 3
Y1
26MHz
CS
1
DO
2
WP
3
GND
4
DI
5
CLK
6
HLOD
7
VCC
8
U2
GD25Q80CSIG
3.3V
3.3V
3.3V
3.3V
NRST
ADC
ADC
CHIP_EN
GPIO16
GPIO14
GPIO12
GPIO13
RST
1
ADC
2
EN
3
IO16
4
IO14
5
IO12
6
IO13
7
VCC
8
GND
9
IO15
10
IO2
11
IO0
12
IO4
13
IO5
14
RXD
15
TXD
16
P1
GPIO15
GPIO2
GPIO0
GPIO4
GPIO5
RXD0
TXD0
T
TP1
auto test
GND
GND
C3
10uF/6.3V
C10
0.1uF/16V
L1
2.2pF/50V
L2
2.7pF/50V
C5
2.4nH
C7
0.1uF/16V
C9
1uF/6.3V
C8
0.1uF/16V
R2
12K/1%
R1
12K/1%
C1
4.3pF/50V
C2
4.3pF/50V
R4
200R/5%
C4
0.1uF/16V
VDDA
1
LNA
2
VDD3P3
3
VDD3P3
4
VDD_RTC
5
TOUT
6
CHIP_EN
7
XPD_DCDC
8
MTMS
9
MTDI
10
VDDPST
11
MTCK
12
MTDO
13
GPIO2
14
GPIO0
15
GPIO4
16
VDDPST
17
SD_DAT A_2
18
SD_DAT A_3
19
SD_CMD
20
SD_CLK
21
SD_DAT A_0
22
SD_DAT A_1
23
GPIO5
24
U0RXD
25
U0TXD
26
XTAL_O UT
27
XTAL_IN
28
VDDD
29
VDDA
30
RES12K
31
EXT_RSTB
32
GND
33
U1
ESP8266EX
R3
12K/1%
C6
10uF/6.3V