Trying to utilize USB from ILITEK touch controller - Page 1
Forum section: electronics / beginners

author: Palmore
author_rank: Newbie
timestamp: February 02, 2024, 01:00:38 am
content: Backstory -I have 3 old school Android touchscreen 18.5inch displays I picked up from my old job. They work.. well decent. I am using them to control my home automation system.Sadly the hardware in the android device just isn't cutting it. I spent some time finding a decent replacement android board from Alibaba at $50 each that I plan on getting. They have everything I need, 8GB of RAM, faster CPUs, LVDS and Backlight control for the monitor/display.The one thing it's missing is a 10 pin touch panel connection that my old Android devices have. So... I decided to dig.A ribbon cable coming form the touch panel is labeled YTG-G18001-F1 (v 1.2) and that goes into the touch controller with an ILITEK 2302M chip on board.I was initially trying to find an adapter to convert the 10pin touch panel ribbon cable to USB, but thus far I've had no luck. Looking at the board and everything I can find it appears to use I2C. It also looks like 5 of the pins are going to ground on the board and I can't tell if 3 pins go nowhere (I can't pull it off the monitor due to fear of breaking it).I haven't had much luck finding anything worth while googling the YTG-G18001-F1 part number and I've only found schematics of the ILITEK 2302M chip but not the board I have directly.I did notice there was some silk screening behind the white sticker in the top right of the board, upon peeling it back it states some details about USB. I had initially tried to solder some USB connections to the bottom left pin headers on the board in hopes to just utilize USB direct into the new android device but no joy.Behind the sticker it states"When using the USB (R1 R2 R8) NC (not connected? I had originally though Normally Closed, but those resistors are present on the board in R1,R2,R8). My initial thought was to just remove them. But that makes me wonder about the I2C side of things where it says "When using the I2C (R9,C17,Y1,U2) NC. That makes me think I'd need to place resistor/cap/etc in those places and remove them from the USB side of things?The middle left of the board appears to be possibly either USB or I2C connects as well. I did try connecting USB to this location but of course no joy. This was before I found the notes on enabling USB.Has anyone seen this board? I would really like to get the USB portion working so I can just plug and play. Or maybe connect to the I2C bus (possibly the left solder pads?A couple of items, What would Y1 and U2 be if I need to connect them to get USB output? Also, the android board I'm looking at has 6pin I2C headers and 4 pin TTL UART headers. If the solder pads on my touch controller are I2C, then what would be the pin out to match the 6pin headers I'm seeing on the android board. I'm assuming I can't connect that to the TTL UART headers.I've spent weeks looking for an android device and now over a week trying to find any information I can on this touch controller.I have also been trying to find a replacement touch controller but have had no luck here either. one input is 64pins and the other is 40pins.Here is the android board I am looking into purchasing.https://www.alibaba.com/product-detail/Manufacturer-YS-M68-RK3568-Android11-4_1600909370397.htmlAnd attached are a few pictures of the touch controller, text, and existing android board I am looking to replace. Any help at all is greatly appreciated.Thank you!

author: ataradov
author_rank: Super Contributor
timestamp: February 02, 2024, 01:26:09 am
content: Y1 would be a crystal. There is no way to tell exact frequency it needs, but I would start with 12 MHz and see if it starts.U2 is a voltage regulator. It is hard to see the pinout under the silk screen, but given the package and some visible traces, it might be similar to MIC5504-3.3.

author: Palmore
author_rank: Newbie
timestamp: February 02, 2024, 01:09:05 pm
content: Awesome, thank you! I will start digging through DigiKey and Mouser to find the parts.Would it be easier to try and utilize the existing I2C connections? Even if I have to use test pads on the board or what I'm assuming is a I2C connection on the left hand side of the board?