STM32F103CB, which is TQFP 48-pin
For the first experimental version of FST-01, I use STM32F103CB, 48-pin TQFP chip.
PCB Design constraint
For FST-01 size (26mm x 13mm, approximately), I needed to have smaller pad pattern of 48-pin TQFP than recommended footprint.
This is not good. For hand soldering, pad pattern …