Operating Voltage; Audio Codec Interface; Headphones Outputs; Audio Jack Connector - ST STM32L562E-DK User Manual

There is one low-power digital microphone on-board of the STM32L562E-DK. The Discovery kit offers the
possibility to connect a MEMS expansion module.
6.7.2

Operating voltage

The microphone is supplied by VDD and is compatible with the VDD_MCU voltage range from 1.8 to 3.3 V. The
audio codec has two supplies:
• VL connected to VDD compatible with VDD_MCU voltage selection 1V8 or 3V3 according to audio codec
datasheet
• 1V8_CODEC source provided by U44
6.7.3

Audio codec interface

The audio codec interface is the MCU SAI1 and an I
Table 10 describes the I/O configuration for the audio codec interface.
I/O
PG1
PE2
PE3
PE4
PE5
PE6
PB6
PB7
6.7.4

Headphones outputs

The STM32L562E-DK Discovery kit can drive stereo headphones. The STM32L562QEI6QU sends up the stereo
audio channels, via its SAI1 TDM port, to the codec device. The codec device converts the digital audio stream to
stereo analog signals. It then boosts them for direct drive of headphones connecting to CN13 3.5 mm stereo jack
receptacles on the board.
The audio codec is set by an I²C-bus. The address is a 7-bit address, with an additional bit to read or write (High
to read, low to write). The AD0 pin connected to GND gives the least significant bit of the address. The address of
the audio codec is 0b1001010x. The hexadecimal code is 0x94 to write, and 0x95 to read.
6.7.5

Audio jack connector

Figure 18 shows the CN13 audio jack connector.
UM2617 - Rev 2
Table 10. I/O configuration for the audio interface
PG1 used as Audio RESET (active LOW)
PE2 used as SAI.MCLK_A
PE3 used as SAI.SD_B
PE4 used as SAI.FS_A
PE5 used as SAI.SCK_A
PE6 used as SAI.SD_A
PB6 used as I2C1_SCL shared between ARDUINO
gyrometer
PB7 used as I2C1_SDA shared between ARDUINO
gyrometer
Figure 18.
2
C interface.
Configuration
®
, CTP, STMod+, 3D accelerometer, and 3D
®
, CTP, STMod+, 3D accelerometer, and 3D
CN13 audio jack connector
UM2617
Audio
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