HardLabs

Nref motherboard

cetola·reform-next-mirror·nref-motherboard/nref-motherboard.kicad_pcb

Nref motherboard PCB layout, top view — open source RP2040/RP2350 board by cetola

About the Nref motherboard PCB

Nref motherboard is an open source RP2040/RP2350 PCB design by cetola, published on GitHub. It is a 6-layer board measuring 122.6 × 75.9 mm, with 269 components from 85 distinct parts.

Its main chip is the RP2350_60QFN, from the RP2040/RP2350 family. Other key parts include the reform2-som-connector, TVS2200DRV, Si52112-B5, LM62460 and PCF8523T. By type, the board carries 106 capacitors, 101 resistors, 19 ICs, 19 connectors, 11 diodes and 5 inductors.

It belongs with the audio, power & battery and usb & debug tools designs in this gallery.

From the project

The original Open Hardware laptop, reloaded.

The original Open Hardware laptop, reloaded.

MNT Reform Next takes the MNT Reform family's modular approach a few steps further: The motherboard doesn't have any exterior ports, instead it breaks out all important signals in groups to FPC and JST-SH headers. The connectivity to the outside is implemented via user-exchangable Port Boards that increase repairability, customizability and future proofing of interfaces. The motherboard provides the system controller (RP2040 based), main (multi chemistry) LiFePO4/LiIon charger buck/boost controller, main 5V and 3V3 power rails and the SOM…

Nref motherboard, from the project README
From the project README

Main components on the Nref motherboard

reform2-som-connectorTVS2200DRVSi52112-B5LM62460PCF8523TUSB2514B_BiFSUSB42MUXW25Q128JVSRP2350_60QFNTS3USB30EDGSRBQ25792CH340NTCA6408APWTPS560430X3FDBVR

Nref motherboard bill of materials (BOM)

269 components, 85 distinct parts.

QtyPartRefs
1
reform2-som-connector
TE
U1
1
TVS2200DRV
Texas Instruments
U2
1
Si52112-B5
Skyworks
U4
2
LM62460
Texas Instruments
U5, U11
1
PCF8523T
NXP
U6
1
USB2514B_Bi
Microchip
U7
5
FSUSB42MUX
Texas Instruments
U8, U13, U14, U17, U19
1
W25Q128JVS
Winbond
U9
1
RP2350_60QFN
Raspberry Pi
U10
1
TS3USB30EDGSR
Texas Instruments
U12
1
BQ25792
Texas Instruments
U15
1
CH340N
WCH
U16
1
TCA6408APW
Texas Instruments
U18
1
TPS560430X3FDBVR
Texas Instruments
U20
1
12MHz 10pF
Abracon
Y1
1
24MHz
Seiko Epson
Y2
1
25MHz
Abracon
Y3
1
32.768 kHz
Raltron
Y4
1
POWSW
JST
J1
2
Conn_01x12_Pin
Hirose
J2, J8
Show 65 more
QtyPartRefs
2
1-2199230-6
TE
J4, J21
1
SYSCTL
JST
J5
1
USB_INT1
JST
J6
1
PWR
JST
J7
1
Conn_01x14_Pin
Hirose
J9
1
DISP
JST
J10
1
BAT1
JST
J11
1
BAT2
JST
J12
1
USB_INT2
JST
J14
1
SM03B-SRSS-TB
JST
J15
2
Conn_01x10_Pin
Hirose
J16, J17
2
Conn_01x20
Hirose
J18, J20
1
SER
JST
J19
2
NGFF-Mount
Würth
H1, H8
1
SW_DIP_x02
kangshen
SW1
1
SYS_RESET
XKB
SW2
2
TS4148 RBG
Taiwan Semi
D2, D3
4
Red
Vishay
D4, D6, D10, D14
2
ESDS314
Texas Instruments
D5, D8
1
CUHZ20V,H3F
JSMSEMI
D7
2
SBR1A30T5-7
Tech Public
D12, D13
1
12uH
cijang
L1
1
3.3uH
cijang
L2
1
2.2uH
cijang
L3
1
XGL6060-222MEC
2.2uH
Coilcraft
L4
1
3.3uH
Abracon
L5
32
0.1uF
Samsung
C1, C9, C10, C13, C15, C17, C20, C22 +24
20
10uF
Samsung
C2, C3, C31, C39, C55, C58, C63, C75 +12
2
10pF
Samsung
C4, C66
4
470nF
Samsung
C5, C54, C59, C61
10
22uF
Murata
C6, C11, C14, C16, C57, C67, C68, C69 +2
4
18pF
FH
C7, C8, C74, C76
7
47uF
Murata
C12, C32, C33, C34, C37, C38, C43
2
15pF
FH
C18, C19
2
4.7uF
Samsung
C21, C41
4
4.7uF
Samsung
C40, C42, C78, C102
2
1uF
Samsung
C56, C60
1
2.2uF/50V
Samsung
C98
3
47nF
Yageo
C100, C101, C103
1
1nF/50V
FH
C104
7
10uF
Murata
C105, C107, C108, C110, C112, C117, C118
3
470nF
Murata
C109, C119, C120
2
10uF
Samsung
C111, C113
6
4.7k
UNI-ROYAL
R1, R2, R37, R39, R49, R50
22
10k
UNI-ROYAL
R3, R14, R17, R25, R29, R36, R66, R67 +14
4
47k
UNI-ROYAL
R4, R5, R15, R35
25
0
UNI-ROYAL
R6, R21, R38, R42, R45, R46, R47, R48 +17
1
33
UNI-ROYAL
R7
10
270
UNI-ROYAL
R8, R9, R10, R11, R12, R13, R56, R57 +2
9
1k
UNI-ROYAL
R16, R19, R27, R28, R41, R51, R53, R55 +1
2
4.99k
UNI-ROYAL
R18, R31
1
12k 1%
UNI-ROYAL
R22
4
100k
UNI-ROYAL
R23, R26, R75, R76
1
24.9k
UNI-ROYAL
R24
1
43.2k
UNI-ROYAL
R30
2
27.4
UNI-ROYAL
R32, R33
2
1M
UNI-ROYAL
R34, R69
4
49.9
UNI-ROYAL
R43, R44, R62, R63
1
2
UNI-ROYAL
R85
1
2.2k
UNI-ROYAL
R87
1
27k
UNI-ROYAL
R88
1
100
UNI-ROYAL
R89
1
127k
UNI-ROYAL
R93
1
100k
UNI-ROYAL
R94
1
15k
UNI-ROYAL
R96

Nref motherboard design files

The KiCad project lives in the cetola/reform-next-mirror repository on GitHub; these links point at the commit this page was built from.

Nref motherboard: common questions

What microcontroller does the Nref motherboard use?

The Nref motherboard is built around the RP2350_60QFN, from the RP2040/RP2350 family.

How big is the Nref motherboard PCB?

The Nref motherboard measures 122.6 × 75.9 mm, has 6 copper layers and is 1 mm thick.

How many components are on the Nref motherboard?

269 components, from 85 distinct parts. The full bill of materials is listed on this page.

Where can I download the Nref motherboard design files?

From the cetola/reform-next-mirror repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Nref motherboard design in my own project?

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

Can I test firmware for the Nref motherboard 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.

More boards in reform-next-mirror

Similar boards