Laird RM126 Series, User Manual

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Pin
Name
Pin Function Connection Shared Feature
Suggested
Mapping
Output Slave
Input SB11)
3V3 VCC 3.3V power VMCU1 RM126x voltage
domain 3V3
GND Reference
Ground GND Ground GND
PWM PWM output PC04 BREAKOUT_LEFT10 TIMER0.CCx
INT Hardware
Interrupt PC05 BREAKOUT_LEFT9
RX UART Receive PD02 (via shorting SB8, cut
default SB7) BREAKOUT_LEFT8 USARTx.RX
TX UART Transmit PD023 (via shorting SB12, cut
default SB11) BREAKOUT_LEFT7 USARTx.TX
SCL I2C Clock PD02 (via shorting SB5, cut
default SB7) QWIIC_I2C_SCL (via
shorting SB6, cut
default SB7);
BREAKOUT_LEFT6 I2Cx.SCL
SDA I2C Data PD03 (via shorting SB9, cut
default SB11) QWIIC_I2C_SDA (via
shorting SB10, cut
default SB11),
BREAKOUT_LEFT5 I2Cx.SDA
5V VCC 5V power 5V Board USB voltage 5V
GND Reference
Ground GND Ground GND
The below figure XYZ shows RM126x GPIO’s PD02 and PD03 are shared with multiple signals, with default the
MIKROE_SPI_MISO wired to RM126x PD02 (via closed solder bridge SB7) and MIKROE_SPI_MOSI wired to RM126x PD03
(via closed solder bridge SB11).
Figure 9: PD02 and PD03 Schematic
RM126X_SIO7_PD02
MIKROE_I2C_SDA
BREAKOUT_RIGHT6
QWIIC_I2C_SCL
QWIIC_I2C_SDA
MIKROE_I2C_SCL
R936
0201, 4.7k, 1%
VMCU1
NOPOP
RM126X_SIO6_PD03
BREAKOUT_RIGHT5
MIKROE_SPI_MOSI
MIKROE_UART_TX
MIKROE_SPI_MISO
MIKROE_UART_RX
R937
0201, 4.7k, 1%
NOPOP
SB7
Solderbridge Closed
SB5
Solderbridge Open
SB6
Solderbridge Open
SB8
Solderbridge Open
SB9
Solderbridge Open
SB10
Solderbridge Open
SB11
Solderbridge Closed
SB12
Solderbridge Open