Searching for an elusive data sheet - MST703-LF - Page 1
Forum section: electronics / projects

author: Majorstrain
author_rank: Contributor
timestamp: September 07, 2012, 05:02:51 pm
content: Hi guys and gals,I've been trying to track down the data sheet (or pin designation) for the MST703-LF. It's the LCD driver in the cheep and cheerful 3.5" and 4.3" reversing monitors.The end game is to to use the monitor for FPV flying. But for that to happen I need to disable the 'blue screen' when the video signal is too low and allow the static to be visable. The recovery time from 'blue screen' is to long.I've searched the Web and emailed the manufacturers, but so far no joy.Any help would be great.Cheers,PhilSent from my GT-I9100T using Tapatalk 2

author: Short Circuit
author_rank: Frequent Contributor
timestamp: September 07, 2012, 07:39:26 pm
content: Probably easier to solve the issue at the source, since it's very unlikely that the bluescreen can be eliminated by fiddling at the LCD controller board.Can't you leave the camera always on?

author: Majorstrain
author_rank: Contributor
timestamp: September 07, 2012, 11:44:27 pm
content: Thanks for replying Short Circuit,The video is transmitted from the quadcopter in the air to the ground via a 5.8GHz Rf link. When the signal degrades to much the monitor will blue screen. It takes a minimum of one second for the monitor to reset, which is a long time when your flying by reference to the video. The signal might have dropped out for a 100mS but you loose vision for a lot longer.The chip has eeprom attached as well so it may have some programmability.I'd thought of using the RSSI signal from the receiver to switch in a substitute sync signal but it's update rate is to slow.Some have had success putting a DVR inline, but I thought I might try and hit the issue at the source.Cheers,PhilSent from my GT-I9100T using Tapatalk 2

author: Psi
author_rank: Super Contributor
timestamp: September 08, 2012, 01:51:14 am
content: Took me about 2 minutes of googling.-Site is a bit slow to load.-Says MST703-ds but the ordering guide box on page 9 says MST703-LF, so im sure its the right datasheet.-You dont seem to be able to do download it, have to view it on the website.-It has pinouts (page4) and all of the register info for driving the chip.I think you'll want to spend a few hours taking screen shots of all 200 pages and make your own pdf, its pretty slow to load each section otherwiseThe website is a bit picky about how you link to it. But the google url seems to work fine.http://www.google.co.nz/url?sa=t&rct=j&q=&esrc=s&source=web&cd=6&cad=rja&ved=0CE4QFjAF&url=http%3A%2F%2Fwenku.baidu.com%2Fview%2F53b8701ca8114431b90dd8be.html&ei=7qVKUKyfEaLeigep8YDYDA&usg=AFQjCNFXJmA9aJO5dI6wFhtY9pzP35KTKw

author: Majorstrain
author_rank: Contributor
timestamp: September 08, 2012, 10:13:41 am
content: Thanks Psi,Your a google Jedi. I spent a few hours looking and got no where.Cheers,PhilSent from my GT-I9100T using Tapatalk 2

author: amyk
author_rank: Super Contributor
timestamp: September 08, 2012, 10:25:14 am
content: You should look at the Chinese sites too, they have a lot of electronics informationFound a PDF here, and attached for your convenience:http://www.wenkudaquan.com/txt.asp?id=wk53b8701ca8114431b90dd8be01It says it contains an "embedded MCU" but no mention of what exactly it is... probably 8051.

author: Majorstrain
author_rank: Contributor
timestamp: September 08, 2012, 10:33:58 am
content: Thanks,I gotta ask, what search terms did you guys use.I'm obviously not speaking Google's language.Cheers,Phil

author: amyk
author_rank: Super Contributor
timestamp: September 08, 2012, 10:49:24 am
content: "mst703 datasheet", 3rd page, about halfway down. Psi's result is first on the 2nd page for that query.

author: Majorstrain
author_rank: Contributor
timestamp: September 08, 2012, 10:56:54 am
content: Cheers,Now I feel like a complete twit.It's all good though. :-)After a quick look at the datasheet,it seems my solution lies in a registry bit change.PhilThanks again guys.Sent from my GT-I9100T using Tapatalk 2

author: Psi
author_rank: Super Contributor
timestamp: September 08, 2012, 12:31:05 pm
content: When looking for hard to find datasheets never overlook the sites that have it but want you to pay.Some of them show the pdf filename which you can then google to find the file somewhere else

author: Majorstrain
author_rank: Contributor
timestamp: September 08, 2012, 12:38:38 pm
content: That info is gold,thanks Psi.

author: kyndal
author_rank: Regular Contributor
timestamp: September 29, 2012, 07:50:15 pm
content: Thanks guys.i have been looking for this datasheet for a while..(yes. i have googled it extensively........... mostly getting these Chinese sites with no real datasheet)but finally after a bit of google translating of the link above, i managed to sign up in Chinese anddownload the datasheet PDF too...is the same as the one attached. so save yourself the trouble ;o)Does anybody have experience with programming these chips...im hoping to interface directly to the OSD function via spi / serial ?/Kyndal