03/31/2016 at 11:02 •
I made a (small) pinout mistake:
UART0_TXD was indicated on pin 18 of the module. This is false. UART0_TXD is affected to pin 14 in reality.
This makes a small change in the pinout of the module. NO adverse impact on its functions.
All the pictures and files have been update accordingly.
03/22/2016 at 13:48 •
This morning I have populated and "baked" 7 XSBO boards in my reflow oven. The operation was fully successful and all boards work perfectly.
The picture shows the test software flashing process. This is done thanks to an LPClink module. During the test, the board is supplied bya CR2032 coin battery (3 Volts).
Each I/O port is then checked with the oscilloscope probe.
The 6 boards of the upper row have already been flashed and tested OK.
03/21/2016 at 14:17 •
have received the boards (10 of them) from china this morning (2016/03/21) and I have immediately populated a board - just to see...
I am not equipped with reflow oven at my office, so I have made an attempt with a regular (big 80 Watt) Weller soldering iron :-).
The overall quality of the PCB seems OK.
First board populated
There are only four electronic components on the board: an LED, a resistor, a capacitor and the microcontroller.
The header on the left is to be connected to an LPClink board to flash the device. The 4 pins on the right are for a console.
After the classic continuity tests, I flashed a basic blinky that I had prepared for this purpose.
After a few hesitations, I managed to flash the programm and it worked immediately. So the board is at least "flashable". I have not yet tested all the ports, but I am confident.
Conclusion: it is possible to solder 0.4 mm pitch DFNs with a regular soldering iron (without frying them).
03/15/2016 at 12:03 •
The layout is finished and I will order 10 PCB's at pcbway.
Order has been passed this afternoon - The boards should be delivered by the begining of next week. Wait and see...
03/14/2016 at 13:59 •
2016/03/11: 20 parts ordered at Mouser.
Mouser have been very fast. Components ordered on friday and received today, monday.
The picture in the galery shows the LPC812 (rectangular XSON16 package) and the LPC1102UK (square BGA package) side by side. The squares printed on the paper measure 5 X 5 mm ( 1/5 X 1/5 inch).