Usart Configuration; Audio Dac And Mems Microphone; 9-Axis Motion Sensors; I 2 C Extension Connector Cn2 - STMicroelectronics STM32L476 User Manual

Hardware layout and configuration
10.9

USART configuration

The USART interface available on PD5 and PD6 of the STM32L476VGT6 can be
connected to the ST-LINK MCU to use the Virtual Com Port function.
To use the Virtual Com Port function with:
•
The on-board STM32L476VGT6: set SB13 and SB16 ON (SB15, SB17 must be OFF).
• An external MCU: remove solder from SB13 and SB16, solder a two pins header on
JP4, then RX and TX of the external MCU can be connected directly to RX and TX of
JP4.
(For more details see
10.10

Audio DAC and MEMS microphone

An audio stereo DAC CS43L22 (U13) is connected to SAI interface of STM32L476VGT6.
The STM32L476VGT6 controls the audio DAC via the I2C1 bus which is shared with the I
extension connector CN2.
I2C1 is also available on the connector P1, pins labeled 'PB6' (I2C1_SCL) and 'PB7'
(I2C1_SDA).
The stereo output jack connector is CN6.
2
Note: I C address of CS43L22 is 0x94.
A MEMS audio sensor omnidirectional digital microphone provides a digital signal in PDM
format to the STM32L476VGT6.
10.11

9-axis motion sensors

STM32L476 Discovery board supports some 9-axis motion sensors, composed of:
•
L3GD20 (U7): a three-axis digital output gyroscope
•
LSM303C (U6): a 3D accelerometer and 3D magnetometer module
which are connected to STM32L476VGT6 through SPI.
2
10.12 I C extension connector CN2
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Section 11: Schematics)

Figure 9. Connector CN2

UM1879 Rev 4
UM1879
2
C