4 layers85 × 56 mm
Mezzanine
oclyke/cm4crypto
cm4crypto is an adapter board that allows you to use an M-Key M.2 compatible module with the Raspberry Pi Compute Module 4 (cm4).
34 parts
4 layers85 × 56 mm
Lobby
oclyke/cm4cryptocm4crypto is an adapter board that allows you to use an M-Key M.2 compatible module with the Raspberry Pi Compute Module 4 (cm4).
- Size
- 85 × 56 mm
- Copper layers
- 4
- Thickness
- 1.33 mm
- Parts
- 41
- Nets
- 296
- Pads
- 618
- Tracks, vias
- 2,017, 344
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 5 (file 20210424)
- Created
- 4 May 2021
- Updated
- 25 Apr 2024
Overview
Lobby is an open-source printed circuit board by oclyke, from the oclyke/cm4crypto repository on GitHub. It is a 4-layer board of 85 × 56 mm with 41 parts on 296 nets, routed with 2,017 tracks and 344 vias.
It is built around the MYLSM00502ERPL and RT9742GGJ5. Its parts include 11 capacitors, 9 resistors, 4 ICs, 4 connectors and 2 switches. It belongs with the computers and single-board computers boards and the Raspberry Pi (Linux) boards of this library.
Main components
2
MYLSM00502ERPL
SMD-40℃~+85℃ 1 120uF 13.1W 1V~5.25V 2.3mm 2.5A 2.5MHz 30mVp-p 4.5V~17V 7.9mm 7.9mm 88% Short Circuit Protection、Over Current Protection、Under Voltage Protection、Overheat Protection、Automatic fault recovery、Light load efficient mode SMD Isolated Power Modules ROHSMurataIsolated Power Modules
RT9742GGJ5
TSOT-23-5-40℃~+85℃ 1 1A 2.7V~6V 70mΩ Active High High Side Switch Short-Circuit Protection(SCP)、Undervoltage Protection(UVP)、Overcurrent Protection(OCP)、Over Temperature Protection TSOT-23-5 Power Distribution Switches ROHSRichtek TechPower Distribution Switches
README
README.mdcm4crypto
cm4crypto is an adapter board that allows you to use an M-Key M.2 compatible module with the Raspberry Pi Compute Module 4 (cm4).
adding fast terabyte SSD options within a sleek RPi 4 format makes the cm4crypto perfect for uses like:
- participating in blockchain networks
- acting as a home media server
- hosting a local database
status
this project is no longer actively developed. the source material will continue to be available for reference.
additional resources:
features
- Adds M.2 M-Key PCIe x1 interface for use with NVMe SSDs or other compatible modules
- Designed for use in the Flirc RPi 4 case
- Power Over Ethernet (PoE) support
- Camera Interface
M.2 compatibility
M.2 specifies a connector layout, standard interfaces, and a few form factors. with such a wide variety of options available no single product can hope to support them all. here are the things you should check to see if your desired module is compatible:
| property | value | notes |
|---|---|---|
| key | M | the M.2 connector on the cm4crypto uses an M key |
| interface | PCIe x1 | though the M key standard supports PCIe x4 the cm4 only has x1 PCIe lane available. thanks to PCIe compatibility this should only reduce performance, not prevent functionality |
| dimensions | up to 22 x 80 mm | to fit in the case |
RPi 4 compatibility
the cm4rypto inherently gains some compatibility with RPi 4 accessories since it was designed to work with the sleek Flirc case however design tradeoffs had to be made as well.
compatible
- 1x Gigabit ethernet
- 2x micro HDMI ports
- 1x USB-C port for power or USB OTG
- 1x USB-A port (USB 2.0)
discrepancies
- there is no 3.5mm audio jack
- GPIO is very limited - only GPIO 2, 3, and 14 are available along with the first set of power pins (for PoE compatibility)
- the camera interface is relocated so that it comes out near the sd card
- the sd card receptacle is slightly offset to allow for the M.2 connector
compatible / recommended products
cases
PoE hats
- CMC Tech 3.5A (available on Amazon)
show and tell
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | 0.1uF | Capacitor_SMD:C_0603_1608Metric | C3, C5, C9, C11 |
| 4 | 2.2K | Resistor_SMD:R_0603_1608Metric | R1, R2, R3, R4 |
| 4 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C2, C4, C8, C10 |
| 4 | SolderJumper_2_Open | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1, JP2, JP3, JP4 |
| 2 | MountingHole | MountingHole:MountingHole_2.7mm_M2.5 | H1, H2 |
| 2 | SW_SPST | cm4crypto:cus-12b | SW1, SW2 |
| 2 | hirose-100 | cm4crypto:DF40C-100DS-0.4V(51) | Module2, Module3 |
| 2 | nf | Resistor_SMD:R_0603_1608Metric | R5, R6 |
| 1 | 10 uF / 25V | Capacitor_SMD:C_0603_1608Metric | C7 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C1 |
| 1 | 12K 1% | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 2.2k | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 47 uF / 6.3V | Capacitor_Tantalum_SMD:CP_EIA-2012-15_AVX-P | C6 |
| 1 | ComputeModule4-CM4 | cm4crypto:Raspberry-Pi-4-Compute-Module-diagonal-mount-bl-ur | Module1 |
| 1 | Conn_01x22_Female | cm4crypto:SFV22R-2STE1HLF | J4 |
| 1 | FSUSB42MX | Package_DFN_QFN:UQFN-10_1.6x2.1mm_P0.5mm | U4 |
| 1 | Jumper_3_Bridged12 | Jumper:SolderJumper-3_P1.3mm_Bridged12_RoundedPad1.0x1.5mm | JP5 |
| 1 | M.2-keyM | cm4crypto:M.2 - M - Amphenol - 10131758-001RLF | U2 |
| 1 | MYLSM00502ERPL | cm4crypto:MYLSM00502ERPL | U3 |
| 1 | Micro_SD_Card_Det | cm4crypto:amphenol-sd-push-pull_114-00841-68 | J3 |
| 1 | R | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | RT9742GGJ5 | Package_TO_SOT_SMD:SOT-23-5 | U1 |
| 1 | THD-02-R | Connector_PinHeader_2.54mm:PinHeader_2x02_P2.54mm_Vertical | J1 |
| 1 | THD-20-R | cm4crypto:rpi-40-just-power | J2 |
The 40 most common of 41 parts.
Questions
How big is the Lobby PCB?
It measures 85 × 56 mm and has 4 copper layers, 1.33 mm thick.
What parts does the Lobby use?
41 parts, built around the MYLSM00502ERPL and RT9742GGJ5. 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 Lobby KiCad files?
From the oclyke/cm4crypto repository on GitHub, at the commit this page was made from: the board is hardware/lobby/lobby.kicad_pcb and its schematic hardware/lobby/lobby.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Lobby design in my own project?
Its repository states no licence, so its author keeps all rights: ask oclyke before reusing the design.
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