HardLabs

MicroSD-Switcher-Reader

will127534·microSD-Switcher-Reader

MicroSD-Switcher-Reader PCB layout, top view — open source board by will127534
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About the MicroSD-Switcher-Reader PCB

MicroSD-Switcher-Reader is an open source PCB design by will127534, published on GitHub under the MIT license. It is a 4-layer board measuring 42.3 × 60.2 mm, with 72 components from 26 distinct parts.

Other key parts include the HD3SS3220IRNHR, TMUX1574DYYR, MCP2221AXML, GL3224 and 25CSM04XXSN. By type, the board carries 26 capacitors, 19 resistors, 9 ICs, 6 connectors, 6 diodes and 5 transistors.

It belongs with the usb & debug tools designs in this gallery.

From the project

A simple USB3.0 uSD card reader with a SD card switch for SBCs

So I have the board with GL3224 (USB3 SD card reader) and MCP2221A (USB2 to GPIO/UART/I2C), and because USB3 connector has both USB3 and USB2 signal, I have it connected to the two ICs so no USB hub needed for the two.

The board has been tested with RPI5 and GL3224 has been tested with 100 Megabytes/sec read/write speed.

Also thanks to https://github.com/NVNTLabs/switch2-SDEX2M2 from NVNTLabs for the microSD card PCB library. (It is a neet MicroSD Express to M.2 adaptor board for Switch2)

MicroSD-Switcher-Reader, from the project README
From the project README

Main components on the MicroSD-Switcher-Reader

HD3SS3220IRNHRTMUX1574DYYRMCP2221AXMLGL322425CSM04XXSNSIP32431DR3LP5912-3.3DRV

MicroSD-Switcher-Reader bill of materials (BOM)

72 components, 26 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
HD3SS3220IRNHR
IC1
2
TMUX1574DYYR
U1, U7
1
MCP2221AXML
MCP2221AxML
U2
1
GL3224
GL3224-QFN32
U3
1
25CSM04XXSN
25CSM04xxSN
U4
2
SIP32431DR3
SiP32431DR3
U5, U9
1
LP5912-3.3DRV
LP5912-1.8DRV
U6
5
BSS214NW
Q1, Q2, Q3, Q4, Q5
1
25MHZ
25Mhz
Y1
1
CONN_01X04_SHIELDED
Conn_01x04_Shielded
J1
1
Micro_SD_Card
J2
1
DM3D-SF
Micro_SD_Card
J3
1
CONN_01X03_MOUNTINGPIN
Conn_01x03_MountingPin
J4
1
USB_C_Receptacle
J5
1
CONN_01X02_MOUNTINGPIN
Conn_01x02_MountingPin
J6
6
LED
D1, D2, D3, D4, D5, D6
21
100NF
100nF
C1, C4, C5, C6, C7, C8, C9, C10 +13
2
12pF
C2, C3
2
1UF
1uF
C18, C19
1
DNP
C23
Show 6 more
QtyPartRefs
7
10K
R1, R8, R11, R12, R13, R16, R17
6
470R
R2, R6, R7, R9, R10, R19
3
1K
R3, R4, R18
1
680R
R5
1
900K
R14
1
200K
R15

MicroSD-Switcher-Reader design files

The KiCad project lives in the will127534/microSD-Switcher-Reader repository on GitHub; these links point at the commit this page was built from.

MicroSD-Switcher-Reader: common questions

How big is the MicroSD-Switcher-Reader PCB?

The MicroSD-Switcher-Reader measures 42.3 × 60.2 mm, has 4 copper layers and is 0.8 mm thick.

How many components are on the MicroSD-Switcher-Reader?

72 components, from 26 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 MicroSD-Switcher-Reader design files?

From the will127534/microSD-Switcher-Reader 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 MicroSD-Switcher-Reader design in my own project?

Yes, under the terms of its MIT license, which will127534 chose for the repository.

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