HardLabs

Df pill

epchain·df-pill·device/df-pill/df-pill.kicad_pcb

Df pill PCB layout, top view — open source STM32 board by epchain

About the Df pill PCB

Df pill is an open source STM32 PCB design by epchain, published on GitHub under the Unlicense license. It is a 2-layer board measuring 30 × 68.5 mm, with 58 components from 34 distinct parts.

Its main chip is the STM32F103C8Tx, from the STM32 family. Other key parts include the MIC5219-3.3YM5 and USBLC6-2SC6. By type, the board carries 15 capacitors, 13 resistors, 11 jumpers, 8 diodes, 4 connectors and 3 ICs.

From the project

Kicad EDA project of a general purpose STM32F103Cx board

This project was extracted from another, complex device project which originally targeted cheap STM32F103C8T6 board known as "bluepill" as main board. However, it soon became apparent that bluepill has shortcomings with USB interface, which was meant to be primary communication channel.

tl;dr bluepill cannot work with USB while being externally powered. It is designed to be powered with USB host only. Some bluepill boards have hardware bugs.

Df pill, from the project README
From the project README

Main components on the Df pill

MIC5219-3.3YM5STM32F103C8TxUSBLC6-2SC6

Df pill bill of materials (BOM)

58 components, 34 distinct parts.

QtyPartRefs
1
MIC5219-3.3YM5
U1
1
STM32F103C8Tx
U2
1
USBLC6-2SC6
U3
1
8MHz
Y1
1
32.768KHz
Y2
1
USB_B_Micro
J1
1
Connector_A
P1
1
Connector_B
P2
1
Connector_SWD
P3
1
BAT_VDD
JP1
1
0
JP2
1
BOOT01
JP3
8
0
JP4, JP5, JP6, JP7, JP8, JP9, JP10, JP11
1
RESET
SW1
1
KEY
SW2
5
BAT60A
D1, D3, D4, D7, D8
1
ESDA7P60-1U1M
D2
1
LED_VDD
D5
1
LED_USER
D6
5
100nF
C1, C3, C4, C5, C11
Show 14 more
QtyPartRefs
1
10uF
C2
1
1uF
C6
1
10nF
C7
1
4.7uF
C8
1
470pF
C9
1
2.2uF
C10
2
20pF
C12, C13
2
12pF
C14, C16
6
10K
R1, R2, R4, R6, R8, R12
1
390
R3
1
1.5K
R5
1
18K
R7
2
1.1K
R9, R10
2
0
R11, R13

Df pill design files

The KiCad project lives in the epchain/df-pill repository on GitHub; these links point at the commit this page was built from.

Df pill: common questions

What microcontroller does the Df pill use?

The Df pill is built around the STM32F103C8Tx, from the STM32 family.

How big is the Df pill PCB?

The Df pill measures 30 × 68.5 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Df pill?

58 components, from 34 distinct parts. The full bill of materials is listed on this page.

Where can I download the Df pill design files?

From the epchain/df-pill repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Df pill design in my own project?

Yes, under the terms of its Unlicense license, which epchain chose for the repository.

Can I test firmware for the Df pill without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

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