Hardware Assembly - sparkfun DEV-17272 Hook-Up Manual

I2C_INT is shared with TX2. This means that you cannot use the ICM-20948 IMU interrupt and SARA DTR / TXD2
simultaneously. You can open the ICM_INT split pad to isolate the IMU interrupt signal.
G4, G5, G6 and G7 are shared with the SPI connections SPI_SCK, SPI_COPI, SPI_CIPO and SPI_CS. This
should not be an issue for you, but it does mean you cannot close the G4-G7 jumpers to enable access to:
SARA_RI, SARA_INT, SARA is On, and SARA_DSR.
STM32 Processor
The STM32 Processor Board does not support RTS1 and CTS1 and so you will not be able to perform hardware
handshaking when using the UART. Serial buffers are so large these days that you probably won't even notice this
restriction, but it is something to be aware of.
The STM32 Processor Board does not support the M.2 TX2 and RX2 pins. This means you cannot use the STM32
to talk to the SARA using any of the dual-UART variants (called variants 2, 3 and 4 in the SARA-R5 System
Integration Manual). You cannot, for example, use UART 1 for your LTE traffic and UART 2 for your GNSS data.
G7 is not supported on the STM32 Processor Board. This should not be an issue for you, but it does mean you
cannot access the SARA is On signal.

Hardware Assembly

Now that we are familiar with the hardware on the Asset Tracker Carrier Board, it's time to assemble it with your
chosen MicroMod Processor and get it connected to your computer.
Inserting Your Processor
With the M.2 MicroMod connector, connecting your processor board is a breeze. Simply match up the key on your
processor's beveled edge connector to the key on the M.2 connector. At a 45° angle, insert the processor board to
the M.2 connector. The processor board will stick up at an angle as seen here:
Once the board is in the socket, gently press the Processor down, grab the set screw and tighten it with a Phillip's
head screwdriver: