Espressif ESP8266 Series User Manual

ESP8266EX
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Flash
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Crystal oscillator
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RF
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External resistor
1.4.1.
Power Supply
Digital Power Supply
ESP8266EX has 2 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 1.8 V ~ 3.3 V.
Figure 1-4: ESP8266EX Digital Power Supply Pins
Analog Power Supply
ESP8266EX has five analog pins for power supply. including pin1, pin3, pin4 which provides
internal power supply for internal PA and LNA respectively, and pin28, pin29 which supply
power for internal PLL. The operating voltage for analog power supply pins is 1.8 V ~ 3.3 V.
Note that the power supply channel might be damaged due to the sudden increase of current
when ESP8266EX is transmitting analog signals. Therefore, an additional 0.1 μF capacitor with
a package size of 0603 or 0805 is needed in circuit design,which can match with capacitor
with 0.1 μF capacitor with 0402 package.
Figure 1-5: ESP8266EX AVDD
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