2 layers52.1 × 27.9 mm Pupill32, the printed circuit board in 3D

Pupill32

pu(rple)pill32 -- An indie evalboard for PY32F030F1xP6

Size: 52.1 × 27.9 mm
Copper layers: 2
Thickness: 1.6 mm
Parts: 54
Nets: 43
Pads: 173
Tracks, vias: 439, 148
Pours: 2
Routed: Yes
KiCad: KiCad 8.0 (file 20240108)
Created: 22 Jul 2024
Updated: 12 Apr 2025

Overview

Pupill32 is an open-source printed circuit board by llatva, from the llatva/pupill32 repository on GitHub, published under the CERN-OHL-W-2.0 licence. It is a 2-layer board of 52.1 × 27.9 mm with 54 parts on 43 nets, routed with 439 tracks and 148 vias.

It is built around the PY32F030F18P6TU, CH340N and AMS1117-3.3, with the SRV05-4 among its other parts. Its parts include 18 capacitors, 12 resistors, 4 ICs, 4 connectors and 2 diodes.

Main components

README

README.md

pu(rple)pill32

Compact and inexpensive USB-C development board for PY32F030 (TSSOP20) 32-bit MCU

RevA had some glitches, please refer to changelog in the revB schematic or below. RevB tested to be functional, and can be flash-programmed over USB (see bootloader access below).

Features

development/evaluation board for Pyua PY32F030F1xP6 MCU (TSSOP20)
USB serial (CH340N, ESD protection)
USB bootloader support (e.g. puyaisp.py from MCU-Flash-Tools /1/)
48 MHz operation with internal oscillator
option for 32.768 kHz crystal (if used, pins PA9 and PA10 reserved)
all peripheral pins available
SWD header for programming (by using USB bootloader for flashing, those pins can be configured for other purposes**)
3V3 linear regulator; 3V3 logic levels
powered from USB (SMD fuse for overcurrent protection)
PWR LED and user-programmable USR led (activated by solder bridge)
RESET and BOOT buttons

**) In that case, if you don't need pull-ups for your signals, do not populate R11-R12.

Bootloader access

USB UART is connected to PA2/PA3 (TX/RX). To access bootloader (e.g. puyaisp.py /1/, USB-to-serial), either

Disconnect USB cable, press and hold BOOT button then connect the cable.

Connect USB cable, press and hold BOOT button and press and release RESET button

/1/ [https://github.com/wagiminator/MCU-Flash-Tools]

Images

top bottom

Changelog revA --> revB

added C19 (bug)
swapped UART RX/TX (bug)
added R1 (boot0 pulldown)
R2 -> 5k1 (brightness)
C20 tantalum
SWD resistors R9-R12 added

Independent project -- no affiliation or endorsement

This project is no way affiliated with Puya Semiconductor or any other commercial body. This is an indie evaluation board designed and built by a hobbyist. You may use this open hardware design, at your own risk, according to its license conditions, see the following chapter.

References

/2/ J. Carlson: The cheapest flash microcontroller you can buy is actually an ARM CORTEX-M0+

/3/ OpenPuya -- py32.org

License

This board is licensed under CERN Open Hardware License, version 2, CERN-OHL-W (weakly reciprocal).

Please refer to LICENSE file for more information.

Parts

Qty	Value	Footprint	References
8	100nF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C3, C4, C5, C10, C11, C12, C15, C19
4	12p	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C8, C13, C17, C18
4	MountingHole	MountingHole:MountingHole_2.7mm_M2.5_ISO7380_Pad	H1, H2, H3, H4
3	10k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R1, R11, R12
3	10uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C6, C9, C14
3	5k1	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R2, R3, R4
2	0R	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R5, R6
2	1k	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R7, R8
2	1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder	C1, C7
2	22R	Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder	R9, R10
1	0.8A	Fuse:Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder	F1
1	12M	Crystal:Crystal_HC49-4H_Vertical	Y2
1	22uF	Capacitor_Tantalum_SMD:CP_EIA-3528-21_Kemet-B_Pad1.50x2.35mm_HandSolder	C20
1	32.768 kHz	Crystal:Crystal_Round_D2.0mm_Vertical	Y1
1	AMS1117-3.3	Package_TO_SOT_SMD:SOT-223-3_TabPin2	U4
1	BOOT_BTN	pupill32:SW-SMD_L6.0-W3.5-LS8.2	SW2
1	CH340N	Package_SO:SOP-8_3.9x4.9mm_P1.27mm	U3
1	HeaderL	Connector_PinHeader_2.54mm:PinHeader_1x12_P2.54mm_Vertical	J2
1	HeaderR	Connector_PinHeader_2.54mm:PinHeader_1x12_P2.54mm_Vertical	J1
1	LED-G	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	D2
1	LED-R	LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder	D3
1	OSHW-Symbol_6.7x6mm_SilkScreen	Symbol:OSHW-Symbol_6.7x6mm_SilkScreen	OHW
1	PA8_SEL	Jumper:SolderJumper-3_P1.3mm_Open_RoundedPad1.0x1.5mm	JP2
1	PY32F030F18P6	Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm	U2
1	RST_BTN	pupill32:SW-SMD_L6.0-W3.5-LS8.2	SW1
1	RTSn	TestPoint:TestPoint_Pad_D1.0mm	TP1
1	SRV05-4	Package_TO_SOT_SMD:SOT-23-6	U1
1	SWD_HEADER	Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical	J4
1	TYPE-C 16PIN 2MD(073)	pupill32:USB-C-SMD_TYPE-C-6PIN-2MD-073	USB1
1	USB_PINS	Connector_PinHeader_2.00mm:PinHeader_1x04_P2.00mm_Vertical	J3
1	~	Inductor_SMD:L_1206_3216Metric_Pad1.42x1.75mm_HandSolder	FB1

Questions

How big is the Pupill32 PCB?

It measures 52.1 × 27.9 mm and has 2 copper layers, 1.6 mm thick.

What parts does the Pupill32 use?

54 parts, built around the PY32F030F18P6TU, CH340N, AMS1117-3.3 and SRV05-4. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the Pupill32 KiCad files?

From the llatva/pupill32 repository on GitHub, at the commit this page was made from: the board is pupill32.kicad_pcb and its schematic pupill32.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the Pupill32 design in my own project?

Its repository publishes it under the CERN-OHL-W-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/llatva-pupill32" title="Pupill32 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/llatva-pupill32.jpg" alt="Pupill32" width="1200" height="900">

A picture that opens the board, for a README

[![Pupill32](https://pcbkit.io/embed/boards/llatva-pupill32.jpg?size=s)](https://pcbkit.io/boards/llatva-pupill32)

Source

Repository: llatva/pupill32
Board file: pupill32.kicad_pcb
Commit: 8718a76
Licence: CERN-OHL-W-2.0

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