MOD-WIFI-ESP8266-DEV, hardware revision B
1
3.3V
3.3V
3.3V
R1
12k
R13
12k
L2
NA
R14
12k
U1
ESP8266
3.3V
WIFI_ANT_ESP8266
R2
GPIO2
2
R12
NA(2k)
R7
R8
R9
SDA
2k
2k
2k
3.3V
3.3V
PWR
R6
2k
LED/Red/0603
R3
100k
RXD
SCL
R17
R15
NA
MTDO
2
1
3
5
7
9
2
4
6
8
10
SW1
SW-TAKTIT1185AU2
R11
3.3V
R4
2k
200R
U2
3.3V
TXD
LED/Green/0603
UEXT
NA
R10
2k
17
GPIO14
16
GPIO12
18
GPIO13
GPIO15
19
GPIO-2
20
GPIO-0
21
3.3V
1
0
22
GPIO4
GPIO4
GPIO0
GPIO2
MTDO
3
SCL
1
0
3.3V
3.3V
GPIO16
15
GPIO0
3.3V
SD_CMD
SD_D3
SD_D2
3.3V
D1
R16
NA
SDA
SJ1
1
NA(IDC10S/PCB)
2
TXD
8
200R
C7
100nF
SD_D3
3
DO/IO1
DI/IO0
GND
CLK
VCC
/HOLD/IO3
/WP/IO2
/CS/
5
SD_D1
6
SD_CLK
7
SD_D2
1
SD_CMD
W25Q16BVSSIG
close
MOD-WIFI-ESP8266-DEV, hardware revision B
OLIMEX LTD, PLOVDIV, BULGARIA
www.OLIMEX.com
2
4
R5
NA(1N5819-S4)
SD_D0
Revision changes in revision B:
1.
2.
3.
4.
Default:1-2
SD_CLK
3
11
GPIO5
SD_D1
SD_D0
GPIO5
SD_D1
SD_D0
200R SD_CLK
SD_CMD
SD_D3
SD_D2
GPIO2
L1
NA
24
23
22
21
20
19
18
17
1
0
Default:1-2
14
CHIP_E
NA
2
MTDO
C6
GPIO0
6
10
8
5.6pF
RTC
GPIO5
SD_DATA_1
SD_DATA_0
SD_CLK
SD_CMD
SD_DATA_3
SD_DATA_2
VDDPST
VDDA
LNA
VDD3P3
VDD3P3
VDD_RTC
TOUT
CHIP_EN
XPD_DCDC
MTMS
MTDI
VDDPST
MTCK
MTDO
GPIO2
GPIO0
GPIO4
12
ADC
1
2
3
4
5
6
7
8
3.3V
9
10
11
12
13
14
15
16
RF_CON2
C5
EXT_RSTB
RES12K
VDDA
VDDD
XTAL_IN
XTAL_OUT
U0TXD
U0RXD
2
open
ANT
32
31
30
29
28
27
26
25
PAD
GND
SJ2
3
GPIO1
GPIO3
4
Added a button and filtering resistor R11 for easier acces to UART/bootloader mode
Added pads for pull up resistor for GPIO4 that might be used as I2C, value of the resistor NA(2K).
Improved jumper names.
Added testpad for the RTC pin
Default:2-3
TXD
RXD
13
ANT_CON
1
MTDO GPIO0 GPIO2
1
X
X
0
0
1
0
1
1
RSTB
1
100nF
1
10uF
SDIO
UART
FLASH
C2
10pF
3
C4
TSX-3225/26MHz/10PPM/7pF/3.2x2.5mm SMD
1
C3
GND
GND
5
9
7
2
GND
C1
10pF
Q1
PAD
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
PIN
3.3V
GND
GPIO1
GPIO3
SD_CLK
SD_D2
SD_D1
SD_CMD
SD_D0
SD_D3
GPIO5
ADC
RSTB
CHIP_E
GPIO16
GPIO12
GPIO14
GPIO13
GPIO15
GPIO-2
GPIO-0
GPIO4
0
