Lyra 24S Development Kit
User Guide
https://www.lairdconnect.com/
15
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Pin
Name
Pin Function
Connection
Shared Feature
Suggested
Mapping
TX
UART Transmit
PB01
BREAKOUT_LEFT7
USARTx.TX
SCL
I2C Clock
PD02 (via
closed
solderbridge
SB5)
QWIIC_I2C_SCL (via open solder
bridge SB6), BREAKOUT_LEFT6
I2Cx.SCL
SDA
I2C Data
PD03(via
closed
solderbridge
SB9)
QWIIC_I2C_SDA (via open solder
bridge SB10), BREAKOUT_LEFT5
I2Cx.SDA
3V3
VCC 3.3V power
VMCU1
Lyra 24S voltage domain
3V3
5V
VCC 5V power
5V
Board USB voltage
5V
GND
Reference Ground
GND
Ground
GND
GPIO’s PD02 and PD03 are shared with multiple signals, with default the
MIKROE_I2C_SCL wired to Lyra 24S PD02 (via closed solder bridge SB5) and MIKROE_I2C_SDA wired to Lyra 24S PD03
(via closed solder bridge SB9).
Figure 9: PD02 and PD03 Schematic
LYRA 24S_PD03
LYRA 24S_PD02
BREAKOUT_LEFT5
BREAKOUT_LEFT6
MIKROE_I2C_SDA
QWIIC_I2C_SCL
QWIIC_I2C_SDA
MIKROE_I2C_SCL
R936
0201, 4.7k, 1%
VMCU1
NOPOP
SB9
Solderbridge Closed
SB5
Solderbridge Closed
SB6
Solderbridge Open
SB10
Solderbridge Open