Those four digital microphones support two stereo inputs connected either to the audio codec or, by
default, connected on two DFSDM odd channels of STM32MP157xAA1: DFSDM_DATA1 and DFSDM_DATA3
synchronized on DFSDM_CKOUT.
The STM32MP157xAA1 DFSDM interface is shared among the four embedded digital microphones and the
extension module on connector MB1262/CN8.
describes the HW configuration for the digital microphones.
Table 21.
HW configuration for the digital microphones
Jumpers
HW
Setting
Configuration
MB1262/JP1
U1/U3 stereo
output
selection
JP1[1-2]
Connected to codec DMICDAT2
JP1[2-3]
Connected to STM32MP157xAA1 DFSDM_DATA3
MB1262/JP2
U2/U4 stereo
output
selection
JP2[1-2]
Connected to codec DMICDAT1
JP2[2-3]
Connected to STM32MP157xAA1 DFSDM_DATA1
MB1262/JP3
U1/U2/U3/U4
CLK selection
JP3[1-2]
Connected to STM32MP157xAA1DFSDM_CKOUT
JP3[2-3]
Connected to codec DMICCLK
MB1262/JP4
U1/U2/U3/U4
VDD
selection
JP4[1-2]
3V3
JP1[2-3]
Codec MICBIAS1
1. Default configuration in bold
6.15.3
Analog microphone and audio jack headphone
A headset including an analog microphone and a stereo headphone may be connected to the black 3.5 mm
headset jack MB1262/CN5.
Figure 12.
Audio jack connector MB1262/CN5
Table 22.
Audio jack connector pinout MB1262/CN5
Pin
Board function
2
MIC_IN
3
GND
4
OUT_RIGHT
5
N/A
6
OUT_LEFT
7
N/A
UM2648
Audio
UM2648
-
Rev 2
page 24/61
