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Cryocooler board

8423·cryocooler-board

Cryocooler board layout, top view — open source RP2040/RP2350 board by 8423

About the Cryocooler board

Cryocooler board is an open source RP2040/RP2350 PCB design by 8423, published on GitHub. It is a 4-layer board measuring 58 × 49 mm, with 39 components from 27 distinct parts.

Its main chip is the MOL Pico 4, from the RP2040/RP2350 family. Other key parts include the PTPS55288RPMR, AD5258BRMZ1 and C1T 4. By type, the board carries 11 capacitors, 8 resistors, 4 connectors, 3 ICs, 2 transistors and 1 inductor.

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

From the project

A 4-layer power and control board for a Ricor K508N cryocooler. It does two jobs, both controlled over I²C:

A 4-layer power and control board for a Ricor K508N cryocooler. It does two jobs, both controlled over I²C:

1. Supplies the cryocooler's power. A TI TPS55288 buck-boost converter steps the 24 V rail down to an adjustable 12–20 V. 2. Sets the cryocooler's target temperature. An Analog Devices AD5258 digital potentiometer acts as the cryocooler's set-point resistor, around 170 K.

Cryocooler board, from the project README
From the project README

Main components on the Cryocooler board

PTPS55288RPMRAD5258BRMZ1C1T 4

Cryocooler board bill of materials (BOM)

39 components, 27 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
PTPS55288RPMR
U1
1
AD5258BRMZ1
U2
1
C1T 4
U3
2
IPZ40N04S5-3R1
Q1, Q2
2
MOL Pico 4
J1, J3
2
MOL Pico 2
J2, J4
2
10UF
10uF
CIN1, CIN2
1
68UF
68uF
CIN3
1
1UF
1uF
CIN4
1
4.7UF
4.7uF
CVCC1
1
5.6nF
Cc1
1
15nF
Cdith1
1
22pF
Cp1
1
26.1k
Rc1
1
32.4K
Rfsw1
1
10UH
10uH
L1
3
0.1UF
0.1uF
C1, C2, C9
4
10UF
10uF
C3, C4, C5, C6
2
1UF
1uF
C7, C8
1
.1uF
C10
Show 7 more
QtyPartRefs
1
68UF
68uF
C11
2
2.20K
2.20k
R1, R2
1
10mili Ohms
R3
1
30K
30k
R4
1
5k
R5
1
40K
R6
2
1 ohm
R7, R8

Cryocooler board design files

The KiCad project lives in the 8423/cryocooler-board repository on GitHub; these links point at the commit this page was built from.

Cryocooler board: common questions

What microcontroller does the Cryocooler board use?

The Cryocooler board is built around the MOL Pico 4, from the RP2040/RP2350 family.

How big is the Cryocooler board?

The Cryocooler board measures 58 × 49 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the Cryocooler board?

39 components, from 27 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Cryocooler board design files?

From the 8423/cryocooler-board repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Cryocooler board design in my own project?

The repository has no license, so all rights stay with 8423. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Cryocooler board 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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