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STM32F042 Board

Dev board for the STM32F042.

Basic linker script, headers, hello world program, and notes are given in programming.

Dimensions: 1.63in (41.50mm) x 0.74 in (18.80mm); headers 0.6in (15.24mm) center to center.

USB C receptacle for USB 2.0.

There is also a Micro-USB version.

Finished Board

PCB Front Rendering

PCB Back Rendering

BOM

USB Section

  • J3: USB C USB 2.0 Receptacle, GCT USB4105-xx-A
  • U3: USBLC6-2SC6 Power protection, SOT-23-6
  • FB1: BK0603HS330-T Ferrite bead, 0805
  • R1: 0k DNP, 0603
  • R6: 5.1k, 0603
  • R7: 5.1k, 0603
  • C9: 0.01u, 0805
  • C10: 0.1u, 0805
  • C11: 4.7u, 1206

Test:

  • USB VBUS voltage
  • 5V VBUS
  • GND
  • USB D- at MCU pin 17
  • USB D+ at MCU pin 18

3V3 Regulator

  • U2: MCP1802 3v3 Linear regulator, SOT-23-5
  • C1: 1u, 0805
  • C3: 10u, 0805
  • C5: 1u, 0805
  • R5: 1k, 0603
  • D2: LED PWR, 0603

Test:

  • 3V3 BUS
  • 3V3 at MCU pins 5, 16
  • GND at MCU pin 15

Microcontroller

  • U1: STM32F042F6Px, TSSOP-20
  • C2: 0.1u, 0603
  • C4: 0.1u, 0603
  • D1: LED USER, 0603
  • JP1: Solder Jumper Boot: Solder pad 0 for normal use.
  • R3: 10k, 0603
  • R4: 1k, 0603
  • Reset1: SW Push, SPST B3U-1000P-B

Headers, JTAG/SWD

  • J1: Conn 01x12 Female, PinSocket 2.54mm
  • J2: Conn 01x12 Female, PinSocket 2.54mm
  • J5: JTAG/SWD, PinHeader 2x05, 1.27mm

Test:

  • Flash blinky program
  • Resest using Reset1