Laird RM126 Series, User Manual

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The RM126x Development Kit features a mikroBUS
™
socket compatible with mikroBUS add-on boards.
MikroBUS add-on boards can expand the functionality of
the kit with peripherals such as sensors and LCDs. Add-on
boards follow the mikroBUS socket pin mapping and
communicates with the on-kit RM126x through UART, SPI
or I
2
C. Several GPIOs are exposed on the mikroBUS
socket. MikroBUS add-on boards can be powered by the
5V or VMCU1 power rails, which are available on the
mikroBUS socket.
The pinout of the RM126x on the kit is made such that all
required peripherals are available on the mikroBUS
socket. The I
2
C signals are, however, shared with the
Qwiic connector, and all mikroBUS signals are also routed
to adjacent breakout pads.
When inserting a mikroBUS add-on board, refer to the
orientation notch on the RM126x Development Kit, shown
in the figure below, to ensure correct orientation. Add-on
boards have a similar notch that needs to be lined up with
the one shown below.
Figure 8: mikroBUS add-on board orientation
The table below gives an overview of the mikroBUS socket pin connections to the RM126x.
Table 4: Pin connections from mikroBUS socket to RM126x
Pin
Name
Pin Function Connection Shared Feature
Suggested
Mapping
AN Analog PC02 BREAKOUT_RIGHT10 IADC0
RST Reset PC03 BREAKOUT_RIGHT9
CS SPI Chip Select PC01 BREAKOUT_RIGHT8 USARTx.CS
SCK SPI Clock PC00 BREAKOUT_RIGHT7 USARTx.CLK
MISO SPI Master Input
Slave Output PD02 (via closed SB7, default) BREAKOUT_RIGHT6 USARTx.RX
MOSI SPI Master PD03 (via closed SB11, default) BREAKOUT_RIGHT5 USARTx.TX
VMCU1
GND
5V
GND
MIKROE_ANALOG
MIKROE_RST
MIKROE_SPI_CS
MIKROE_SPI_SCK
MIKROE_SPI_MISO
MIKROE_SPI_MOSI
MIKROE_PWM
MIKROE_INT
MIKROE_UART_RX
MIKROE_UART_TX
MIKROE_I2C_SCL
MIKROE_I2C_SDA
MikroE Socket
AN
RST
CS
SCK
MISO
MOSI
+3.3V
GND
Labels:
PWM
INT
RX
TX
SCL
SDA
+5V
Labels:
GND
1
2
3
4
5
6
7
8
J201
WCON, 2185-108MG0CYNR2
1
2
3
4
5
6
7
8
J202
WCON, 2185-108MG0CYNR2