Power Supply - Espressif ESP8266 Series System Description

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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.
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.
Espressif
Figure 1-4: ESP8266EX Digital Power Supply Pins
Figure 1-5: ESP8266EX AVDD
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ESP8266EX
2016.06