Espressif ESP8266 Series User Manual

ESP8266EX
1.4.
Schematics
The highly integrated design of ESP8266EX tremendously reduce the number of components
required. Beside ESP8266EX, less than 10 resistors and capacitors, 1 crystal oscillator and 1 SPI
flash are needed to make a complete module with wireless communication capability. The
following is a detailed description on ESP8266EX schematics and layout design to ensure
optimum functionality.
The complete circuit diagram of ESP8266EX is illustrated in Figure 1-3.
Figure 1-3: ESP8266EX Schematics
ESP8266EX schematics design includes six aspects:
•
Power supply
•
Power-on sequence and reset
29
VDDD
P
Analog power 3.0 V ~ 6 V
30
VDDA
P
Analog power 3.0 V ~ 3.6 V
31
RES12K
I
Serial connection with a 12 kΩ resistor to the ground
32
EXT_RSTB
I
External reset signal (Low voltage level: Active)
Pin
Name
Type
Functions
Note:
GPIO2, GPIO0 and MTDO can be configured to a 3-bit strapping register that determines the
booting mode and the SDIO timing mode.
Espressif
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2016.06

Espressif ESP8266 Series Specifications

General

RAM	50 KB
Wi-Fi	802.11 b/g/n
GPIO Pins	17
ADC	1
ADC Resolution	10-bit
I2S	Yes
Operating Temperature	-40°C to +125°C
Clock Speed	80 MHz (can be overclocked to 160 MHz)
Flash Memory	External, up to 16 MB
Operating Voltage	3.0V to 3.6V
I2C	Yes (software implementation)
UART	2
Deep Sleep Power Consumption	10 µA
Dimensions	Varies depending on module
Processor	Tensilica L106 32-bit