Hello!
For the past few years I've been experimenting with electronics and have learned some of the basics, mostly from the internet and great sites like this one. Now I've come up against a project that's stretched past my abilities, so I figured I'd ask for some help.
I'm trying to build a touch controller for my 4-wire resistive touch screen LCD. I've got some Texas Instruments ADS7843 chips which are supposed to be able to convert the resistive touch screen to a serial output, using something similar to the following schematic (from
datasheet)...
Now, as far as I can tell, I still need another chip to actually interface with my PC's serial (RS232) port. Enter the TI MAX232 chip, which can be hooked up something like this...
So how do I interface the two? On the MAX232 looks like I need to supply
TXD and
RXD connections, but the ADS7843 chip has quite a few outputs:
- Serial/Conversion Clock
- Chip Select
- Serial Data In
- Converter Status
- Serial Data Out
- Pen Interrupt
I'm guessing that the
TXD and
RXD basically get connected to the
Serial Data In and
Serial Data Out. What about the other 4,
Serial/Conversion Clock, Chip Select, Converter Status, Pen Interrupt?
Do I need some other chip as well, such as a microcontroller?
Thank you very much for anyone's input, and sorry if the images don't show up properly... Hopefully I've provided all the relevant information, but if you need to know anything else, please ask!
Warren