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.

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