MTUDK2-ST-CELL board

[toyo ayeni]

hi Leon/support

I’m trying to put the MTQ-LAT3-B01 on a custom
board. Correct me if I’m wrong but it looks like the
USB micro on the MTUDK2-ST-CELL is connected to pin 1
(uart debug Rx input) and pin 40 (uart debug Tx input)
through a USB-UART converter?

It also looks like the USB pins on the 40-pin header is
not used for anything?

[Leon Lindenfelser]

Hi Toyo,
When plugging into the micro USB connector, you gain access to two serial ports. Pins 9 & 32 go through the USB-UART converter. Pins 1 & 40 go through the interface chip.
The USB pins on the 40 pin connector and not routed to anything on the UDK board. They are connected in parallel with the micro USB connector on the MTQ.
Leon

[toyo ayeni]

Leon

I shouldnt need the interface chip for mbed_tx and mbed_rx to work right?
Basically I’m saying I should be able to connect directly to pin 1 and 40 with
some other interface that can provide uart voltage levels right?

[Leon Lindenfelser]

Correct.
The interface chip or an SWD/JTAG interface is necessary if you wish to be able to perform in circuit firmware update. Another possible firmware update option would be to update via FOTA.

[toyo ayeni]

awesome thanks.
one last question. where can I find those barrels that sit the LAT3 up on the
top-left and bottom-right corners attached to DK2 board?

[Leon Lindenfelser]

Search for SMTSO-M2-6ET.

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