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UM1900 Hardware description
DocID027905 Rev 4 11/20
In addition, J2 must be placed in position 1-2 for on-board microphone acquisition or 2-3
when using an external microphone while J3 must be left open. When acquiring on-board
microphones, close SB9 to acquire both of them.
4 microphone acquisition
In this case, the PDM line of the third and fourth microphone is also routed to the MCU.
Table 3: Solder bridge configuration for 4 microphone acquisition
SB Status
SB7 Open
SB8 Open
SB9 Open
SB10 Open
SB11 Open
SB12 Close
SB13 Open
SB14 Open
SB15 Open
SB16 Close
SB17 Close
SB18 Open
SB19 Open
SB20 Open
SB21 Open
In addition, J2 and J3 must be placed in position 2-3 for external microphone acquisition.
2.3.2.2 Jumper settings for I²S-plus-SPI-based systems
1 microphone acquisition
The I²S peripheral is used directly to give the right clock to the microphone and thus
acquires the same microphone.
Table 4: Solder bridge configuration for 1 microphone acquisition
SB Status
SB7 Open
SB8 Open
SB9 Open
SB10 Open
SB11 Close
SB12 Open
SB13 Close
SB14 Close