Data Sheet

2 Module interfaces
Pin number Symbol Pin type Function
11 PD3 I/O Common I/O
interface, which
corresponds to Pin
38of the IC
12 RX0 I/O Serial port
UART0_RX, which
can also be used a
common I/O
interface and
corresponds to Pin
4 of the IC chip
13 TX0 I/O Serial port
UART0_TX, which
can also be used a
common I/O
interface and
corresponds to Pin
3 of the IC chip. It
can used to output
logs.
14 BIAS AO MIC_BIAS, power
supply for
microphone,
correspond to Pin
13 of the IC.
15 MIC AI MIC_IN,
microphone input,
correspond to Pin
14 of the IC. You
should reserve an
earth 󰍓lter
capacitor for the
external
microphone.
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