Hello Vim Users,
I’m like it VIM a much for few reasons but It’s missing here some card to offer more interfaces. I’m developed that and I’m guess I can share to everybody who is interest.
Feature list are:
- Toslink SPDIF Optical Out Connector (no coax, just optical)
- 2x USB 2.0 Port, with current limit 1.5A/ per port (used two free usb port)
- Extra 2.1/2.5mm DC jack for 5V power in (USB C can be used as next USB port)
- Controlled +5V/3.3V FAN by PWR_EN and GPIO PWM_F (turn off FAN, when system is off or GPIO)
- Audio Chip with “Line Out” and “Mic In” as 3.5mm Jacks
- Serial Port TX/RX to USB chip on board, for debugging and communications
- Small EEPROM 24C64 (8Kbyte) for any user data/configurations
- And last but not least 2x20Pin connectors supports Raspberry PI breakouts - more details later
- same shape like VIM, so can be easily plugged in and fixed by screws.
With that boards, I’m believe you can run VIM finally with all full features set developed by Khadas
Price: 25$/24.5Euro (now) without shipment. I’m located in Germany and I’m able to ship goods around the world. I can make ebay item, but will prefer if we can makes payment out of ebay (I need pay 10% to ebay ). Sorry no gearbest, aliexpress, etc.
Shipment price should be 5$/4.9Euro For many countries, for others different price (sorry, price is high, I know)
If I’m found that somebody is interest, I can provide better prices (but I need get interest for more than 30pcs) than price will be cheaper for 2$. Please sent me message or leave message here.
More specific details
2x USB Ports has each limiter 1.5A (no polyfuse, real limiter). I’m recommend use 2.1mm Adapter (5V/3A) or more to support full current flow. This will anyway enable to use USB-C for another purpose and not power the system. All peripherals are off when system is off (SPIDIF,USB,Audio,FAN,Raspberry). USB Over current can be watch by system, but only one signal shared for these two USB.
Input jack 5V, has 4A fuses and protective diodes, can support power for whole system and than no any others power is needed. Only +5V input is allowed (no +9-12V etc). Sorry no space.
Audio Chip is WM8731, chosen for support Mic IN, sorry no Headphones due space limitations. Line Out can be used only with amplifier or home PC speakers/receiver. There are two jack 3.5mm on board for easy connections. 96KHz only, but 100dB.
Serial Ports use PL2303SA, user can chose which serial port will goes to the USB. With MicroUSB you can connect host systems and watch/control the VIM. Chips was used due to the space and cost. There is additionally connector for FTDI-3.3-TTL cable adapter (can be directly connected, without modifications)
FAN connectors supports 1.00mm and 1.25mm connector. Can be chosen voltage by jumper. FAN is turnoff when power is off, or can be controlled by SW by GPIO PWM_F signal. By Default FAN is running on full speed.
Serial EEPROM AT24C64 can be used for any data needs to be stored permanently or for bootup .
Raspberry Connections is 2x20Pins with GPIO expander and I2C->SPI expander. This means, That I’m re-create full connections to support any raspberry boards what you can find in the market. Of course, there isn’t SW support for expander yet, but here community is fine, right? . So either GPIO and SPI interface isn’t supported now. Others signals like I2C, Serial Port, I2S are connected too.
Expander are MCP23017 and SC18IS602B. For example With ISP/i2C you can drive small display, etc…
There is universal 5V/3A Transistors for general purpose controlled by GPIO. Connector 2pin/2mm.
I can imagine that board can be entry point for more applications, or your project. Sorry for high price, components are expensive, what you can confirm by schematic check, but is for demo purposes. Due the open policy of VIM schematic, I would like follow that too
Please, if you find any mistake in schematic, please let me know.
And one important things, design is ready, but first prototypes (min 10pcs) will be ordered soon. I’m just try figure your interest. So currently I’m cannot ship the boards. This will takes aprox. 5 weeks from now. So I haven’t nothing by hand yet. When prototypes will be ready and working I can ship that.
below, how board will looks like, the all components are from TOP and high of them should be more than 8mm for extensions board for raspberry PI. There are holes for Acrylic Cover (2mm) and internal 2mm for board without acrylic frame. Raspberry PI extensions can be hold in 3 holes. In the package should be 4x8mm spacer and 4x M2x30mm screws, what needs to be exchanged by previous screws to put all together.
P.S. I’m ok, if Khadas would take that and offer by yourself… Believe or not, there isn’t really big revenue for small players like me. But if I’m spend a time with that, I’m Like to support others.