So here’s the BGA fallout…
I am now using Alitum as part of a new part time job so I decided to do a pet project I have been wanting to do for awhile now which is a STM32F4 based board using a BGA.
Now the main issue with the STM BGA’s is they use a smaller ball pitch at 0.65mm than the usual cuplrits like the Hydra uC which are 0.8mm pitch balls. Me being me I didn’t let that freak me out too much.
The STM I have chosen is a STM32F427IIH6 which has 140 IO’s, 2mb and 256kb of ram in a 10mm package with 201 balls.
17 pins are rout out the headers, SPI, Uart, I2C, PWM and Analog
So out with Alitum, mad random clicking and I have a board routed out. Main highlights are 0.2mm drilled and tented VIA’s and 6mil traces under the BGA using 4 layers
PCB’s where made using PCB - Pool in Ireland.
Plugged in and wee all good - running Mountaineer 4.3 firmware (Huge thanks to Cuno and team)
Video shows digital out for the onboard LED’s, SPI for the 7 segment display and UART for the 3 Dongbu Servos.
Any questions just ask away - and yes I did use a £5 Maplin soldering Iron for the headers