Power Supply - Espressif Systems ESP8266 Series Hardware Design Manuallines

"
VDD33
VDD33
C5
10uF
GND
ANT1
1 WIFI_ANT
2
GND
TOUT
CH_PU
GPIO16
"
The ESP8266EX schematics include seven aspects:

Power supply

•
Power-on sequence and reset
•
• Flash
Crystal oscillator
•
RF
•
External resistor
•
• UART
1.4.1. Power Supply
1.4.1.1. Digital Power Supply
ESP8266EX has two digital pins for power supply, Pin11 and Pin17. For digital power
supply, there is no need to add additional filter capacitors. The operating voltage range of
digital power supply pins is 1.8V ~ 3.3V.
Espressif
C6 C8
1uF 1uF(NC)
12K±1%
GND GND
L3 4.3nH
GND
C3 C7
0.1uF TBD(NC)
GND GND
1
VDDA
2.2nH
C4 2
LNA
3
VDD3P3
4
VDD3P3
5
L1 L2
VDD_RTC
6
TOUT
2.4pF 3.0pF
7
CHIP_EN
8
XPD_DCDC
GND GND
ESP8266EX
Figure 1-3. ESP8266EX Schematics
GND GND
U1
C1 C2
6.8pF 6.8pF
GND
GND
R1
26MHz±10ppm
UTXDA R2 499R
24
GPIO5
23
SD_DATA_1
22
SD_DATA_0
21 R3 200R
SD_CLK
20
SD_CMD
19
SD_DATA_3
18
SD_DATA_2
17
VDDPST
U2
" /30 6
1. ESP8266EX
RST
UTXD
URXD
VDD33
GPIO5
SDI/SD1 SCS/CMD 1
/CS DI
SDO/SD0
SCK/CLK SCK/CLK 6
CLK DO
SCS/CMD
7
SWP/SD3 SHD/SD2
/HOLD /WP
SHD/SD2
FLASH U3
GND
VDD33
5 SDI/SD1
2 SDO/SD0
3
SWP/SD3
2018.12