User's Manual

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3.2.3 Unconnected pins advice
PIN FUNCTION PIN TYPE COMMENT
1
UART_AT_RX
I
N/A
2
I2S_OUT
O
Left Open
3
UART_AT_TX
O
N/A
4
I2S_IN
I
Left Ope
n
5
UART_DBG_RX
I
Left Open
6
I2S_CLK
O
Left Open
7
UART_DBG_TX
O
Left Open
8
I2S_SYNC
I
O
Left Open
9
P3V3
P
N/A
10
I2S_MCLK
O
Left Open
11 RESET_EXT_N I Left Open
12
BOOTS
I
Tie to ground
13
P1V8
P
N/A
14
VSS
P
N/A
15
P1V8
P
N/A
16
MIC1_N
I
T
ie to ground (1k)
17
1V8_ENABLE
O
N/A
18
MIC1_P
I
Tie to ground (1k)
19
VSS
P
N/A
20
MIC_BIAS
O
Left Open
21
LINEOUT_L
O
Left Open
22
MIC2_P
I
Tie to ground (1k)
23
LINEOUT_R
O
Left Open
24
MIC2_N
I
Tie to ground (1k)