HardLabs

Mcu coin

Niich·mcu-coin·schematic/kicad/ligma_ESP32-C3_economy_PEX_redesign_TI_charging.kicad_pcb

Mcu coin PCB layout, top view — open source RP2040/RP2350 board by Niich

About the Mcu coin PCB

Mcu coin is an open source RP2040/RP2350 PCB design by Niich, published on GitHub. It is a 2-layer board measuring 97 × 62 mm, with 112 components from 40 distinct parts.

Its main chip is the USB_B_Micro, from the RP2040/RP2350 family. Other key parts include the TX4310-3V3, LTC4054ES5-4.2, BQ51013BRHLR and ESP32-C3FH4. By type, the board carries 40 capacitors, 34 resistors, 8 diodes, 5 ICs, 5 transistors and 4 inductors.

It belongs with the iot & wireless and power & battery designs in this gallery.

From the project

info about coin design and firmware

** not working on original design but manual fix found

Mcu coin, from the project README
From the project README

Main components on the Mcu coin

USB_B_MicroTX4310-3V3LTC4054ES5-4.2BQ51013BRHLRESP32-C3FH4

Mcu coin bill of materials (BOM)

112 components, 40 distinct parts.

QtyPartRefs
1
USB_B_Micro
U1
1
TX4310-3V3
U2
1
LTC4054ES5-4.2
U3
1
BQ51013BRHLR
U4
1
ESP32-C3FH4
U5
3
Q_PMOS_GSD
Q1, Q4, Q5
2
Q_NPN_BEC
Q2, Q3
1
40MHz
Y1
1
32.768kHz
Y2
1
ipex4
J1
1
PCB_ANTENNA
AE1
3
Antenna Ground
Ant_Ground1, Ant_Ground2, Ant_Ground3
1
Antenna Signal
Ant_Signal1
6
MountingHole
H1, H2, H3, H5, H6, H8
2
EVQ-P7A01P
SW1, SW2
7
WS2812B
D1, D2, D3, D4, D5, D6, D7
1
D
D8
2
2.2nH
L1, L2
1
15.3uH
L3
1
SHORT
L4
Show 20 more
QtyPartRefs
2
20p
C1, C3
2
15p
C2, C5
4
1u
C4, C6, C21, C23
1
33nF
C7
2
2.2p
C8, C35
1
100nF
C9
9
10u
C10, C12, C14, C22, C25, C31, C32, C39 +1
2
3.3nF
C11, C13
6
22n
C15, C16, C17, C18, C20, C30
6
0.1u
C19, C24, C26, C27, C28, C29
3
DNP
C33, C37, C38
2
1p
C34, C36
3
DNP
R1, R7, R34
3
1k
R2, R18, R19
11
10k
R3, R4, R5, R8, R10, R15, R20, R24 +3
4
51R
R6, R9, R11, R12
6
200k
R13, R14, R16, R17, R28, R29
4
100K
R21, R22, R23, R30
1
1M
R26
2
200R
R32, R33

Mcu coin design files

The KiCad project lives in the Niich/mcu-coin repository on GitHub; these links point at the commit this page was built from.

Mcu coin: common questions

What microcontroller does the Mcu coin use?

The Mcu coin is built around the USB_B_Micro, from the RP2040/RP2350 family.

How big is the Mcu coin PCB?

The Mcu coin measures 97 × 62 mm, has 2 copper layers and is 0.8 mm thick.

How many components are on the Mcu coin?

112 components, from 40 distinct parts. The full bill of materials is listed on this page.

Where can I download the Mcu coin design files?

From the Niich/mcu-coin repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Mcu coin design in my own project?

The repository has no license, so all rights stay with Niich. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Mcu coin without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.

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