User Manual

Apollo3 Blue Datasheet

DS-A3-0p9p1 Page 404 of 909 2019 Ambiq Micro, Inc.

11.5.6.2 I2S Connections

The I2S BCLK, WCLK and DAT signalsmay each be connected to several pads. Note that BCLK, WCLK

and DAT are selected independentlyTable 600 shows the connections for I2S BCLK, which should have

the corresponding PADnINPEN and PADnPULL bits clear. Table 601 shows the connections for I2S

WCLK, which should have the corresponding PADnINPEN and PADnPULL bits clear. Table 602 shows the

connections for I2S DAT, which must have the corresponding PADnINPEN bit set and should have the

corresponding PADnPULL bit clear.

Table 598: PDM CLK Configuration

Field Value Pad

PAD10FNCSEL 4 10

PAD12FNCSEL 5 12

PAD14FNCSEL 4 14

PAD22FNCSEL 4 22

PAD37FNCSEL 6 37

PAD46FNCSEL 5 46

Table 599: PDM DATA Configuration

Field Value Pad

PAD11FNCSEL 7 11

PAD15FNCSEL 4 15

PAD29FNCSEL 7 29

PAD34FNCSEL 7 34

PAD36FNCSEL 7 36

PAD45FNCSEL 5 45

Table 600: I2S BCLK Configuration

Field Value Pad

PAD13FNCSEL 4 13

PAD19FNCSEL 7 19

PAD20FNCSEL 6 20

PAD46FNCSEL 0 46

Table 601: I2S WCLK Configuration

Field Value Pad

PAD3FNCSEL 7 3

PAD23FNCSEL 4 23

PAD28FNCSEL 0 28

PAD41FNCSEL 4 41