2 layers59.9 × 64.3 mm
Memories
gipi/electronics-notes
Here I'm trying to create a header for the Mojo development board that allows to have the basic minimal peripherals for a running system:
39 parts29
2 layers21 × 26.5 mm
Gj adapter
gipi/electronics-notes29Here I'm trying to create a header for the Mojo development board that allows to have the basic minimal peripherals for a running system:
- Size
- 21 × 26.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 7
- Nets
- 12
- Pads
- 44
- Tracks, vias
- 183, 18
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 18 Mar 2015
- Updated
- 6 May 2024
Overview
Gj adapter is an open-source printed circuit board by gipi, from the gipi/electronics-notes repository on GitHub. It is a 2-layer board of 21 × 26.5 mm with 7 parts on 12 nets, routed with 183 tracks and 18 vias.
Its parts include 3 ICs, 3 connectors and 1 resistor. It belongs with the interfaces and adapters boards of this library.
README
kicad/memories/README.mdMemories
Here I'm trying to create a header for the Mojo development board that allows to have the basic minimal peripherals for a running system:
- Flash
- SDRAM
- VGA
- PS2
In this directory there are the KiCAD files and this is the hand soldered version 1.0
Flash
The flash memory under experimentation is the NAND512W3A2C, with 512 Mbit and x8 of bus width.
SRAM
The SDRAM used here is the MT48LC32M8A2.
VGA
It's a VGA with 3 bits for color channel using a resistor ladder.
Todo
- UART
- SPI
- I2C
- LCD controller
- SDCard
probably are needed only as explicit routed pinout.
Design errors
- The pad of the
AMS1117is thevoutnot ground (Fixed) - enlarge the pad so to make it more hand-solderable
- add mask to the Open Hardware logo (fixed)
- reverse voltage protection
- overvoltage protection
- enlarge holes for VGA and PS/2 (fixed)
- fix R-2R ladder
Parts
7| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | ADG723 | Package_SO:MSOP-8_3x3mm_P0.65mm | U1, U2, U3 |
| 1 | 619k | Resistor_SMD:R_0402_1005Metric | R1 |
| 1 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Horizontal | J2 |
| 1 | Conn_01x05 | Connector_PinHeader_1.00mm:PinHeader_1x05_P1.00mm_Vertical | J1 |
| 1 | USB_B_Micro | Hirose:ZX62D-B-5PA8 | J3 |
Questions
How big is the Gj adapter PCB?
It measures 21 × 26.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Gj adapter use?
7 parts. 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 Gj adapter KiCad files?
From the gipi/electronics-notes repository on GitHub, at the commit this page was made from: the board is kicad/galaxy-jig/gj-adapter/gj-adapter.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Gj adapter design in my own project?
Its repository states no licence, so its author keeps all rights: ask gipi before reusing the design.
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