Data Sheet

30 MIC4N AI MIC3 negative, connected to the external microphone
31 MICBIAS P Used to connect to the power supply of the microphone
33 GPIO2 IO Input signals, used to detect the on/off of the microphone
34 PWM0 IO PWM0, used to drive the blue light
35 SDA IO
The data interface of the I2C (need to connect to the pull-up resis
drive the ring light and other I2C sensory components
36 SCL IO
The clock interface of the I2C (need to connect to the pull-up resi
drive the ring light and other I2C sensory components
37 TX3 IO Transmitting interface of UART3, debugging interface
38 RX3 IO Receiving interface of UART3, debugging interface
39 RST I Reset pin
I/O is the common input/output pin, P is the power supply and ground pin, AI is the Analog input pin, and AO
Electrical parameters 
Parameter Description Minimum value Maximum val
Ts Storage temperature -55 125
VCC Power supply voltage 3.3V 4.2
ESD voltage (human body model) TAMB-25℃ - ± 2000
ESD voltage (machine model) TAMB-25℃ - -
Supply voltage 3.3 to 4.2V, 3.3V preferred
Absolute electrical parameters
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Working conditions
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