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readme.md

STM32 Hardware 01

See forum posts:

First outline of an STM32 design. STM32F303 64pin as a starting point.

The design so far:

  • STM32F303RET 64pin
  • 5V to 3V3 Voltage regulator MCP1825 500mA (enough for an ESP8266 I think)
  • Decoupling capacitors on supply inputs as in AN4206 best practice guidelines.
  • Oscillator
  • ST Link Header
  • UART Header
  • USB DFU (needs testing as above)
  • Battery holder footprint for RTC?
  • Jumper for BOOT0

stm32hw1.png

Further questions:

  1. VREG Datasheet suggests minimum 1uF Output Capacitor, STM32 Hardware Guide suggests 4.7uF on VDD and 1uF on VDDA. Should I add all three in locations close to the respective components or is a 4.7uF capacitor near the voltage regulator sufficient.
  2. Oscillator frequency?
  3. I've used a couple of solder jumpers for the RTC Battery / 3V3 supply selector, would a 3pin throughhole header be better (not likely a configuration that will change regularly in a design - solder jumper should be fine and keeps things compact).
  4. ST-Link connector pin out I copied from Ken's ARMiGO design, the order is different from the SWD connector on the ST-LINK board, is there a standard to adhere too?
  5. Should UART reset connect to NRST somehow? BOOT0 needs to be pulled high and board reset for serial upload to work, inserting a jumper and power cycling the board worked fine in testing above, is there value in automating this step?
  6. USB DFU needs testing, Nucleo reference design has a transistor and 3 resistors connecting the 1k5 pull up to USB_RENUm, The ARMiGO design does not have this, is it needed? Same goes for the 22pF capacitors.

STM32 Eagle libraries

Perhaps the easiest way to get the eagle components for the STM32 range is to use the STM provided bxl CAD fiiles and the recommended route of using the https://app.ultralibrarian.com online tool that can export these bxl files into a variety of formats used by common electronic design tools such as Eagle or KiKad.

stm32lib.png

Download: stm32f303.lbr

The CAD files downloadable from STM also include files for f303 100pin and 144pin designs. The xls file Select_BXLfile.xls details which bxl file to use.