Table 10. On-board DMIC connections
Circuit reference Port
PDM_CLK01_OnBoard P2_16
PDM_DATA01_OnBoard P2_20
7.8.2 External DMIC
The external DMIC it’s a 14-pin adapter that supports up to eight DMIC channels. The clock and data pins are shared with the
on-board DMIC. By default, on-board DMICS are selected. You must move R379 (2-3) and R380 (2-3) to use this header. For
further details, refer to the board schematics.
Table 11. External DMIC connections
Circuit reference Port
PDM_CLK01_Ext (Not connected by default) P2_16
PDM_DATA01_Ext (Not connected by default) P2_20
PDM_CLK23_A P2_17
PDM_DATA23_A P2_21
PDM_CLK45_A P2_18
PDM_DATA45_A P2_22
PDM_CLK67_A P2_19
PDM_DATA67_A P2_23
I2C SCL P0_11
I2C SDA P0_10
NXP Semiconductors
On-board peripherals
i.MX RT685 Evaluation Board, Rev. 0, March 20 2020
User's Guide 26 / 31
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