Search found 2586 matches

by Panu
Wed 2018-12-12 8:37
Forum: VS1005 and VSOS Software
Topic: VS1005G-F-Q xreset remains at 0.5V
Replies: 2
Views: 19

Re: VS1005G-F-Q xreset remains at 0.5V

Hmm, seems strange... but these things have a tendency to always seem strange until the problem is found. Right now I'd keep looking at the XRESET pin. That's an input to the whole other bloc of clocking the chip etc. VS1005 power-up goes something like this (recalled from memory so may not be exact...
by Panu
Tue 2018-11-13 15:52
Forum: VS23S010 Forum
Topic: Color burst problem?
Replies: 8
Views: 461

Re: Color burst problem?

Hi! Ok, no problem. Sure, we can give you a couple of VS23S040 chips. Just write to sales@vlsi.fi and give your information. We will try the circuit and software anyway, as soon as we have some time. The idea is to couple video output 2 to video output 1 via a DC blocking capacitor, choose the compo...
by Panu
Tue 2018-11-13 10:00
Forum: VS23S010 Forum
Topic: Color burst problem?
Replies: 8
Views: 461

Re: Color burst problem?

Hi! Hmm, ok. We need to write the software to support option #4 and also make a board to design and test the video circuit. This will take some time, how much time do you have available? To proceed, we need to know which video format you are targetting, what is the resolution and number of visible l...
by Panu
Mon 2018-11-12 15:18
Forum: Slave Decoder Applications
Topic: Issues when switching out a VS1011e with a VS1053B
Replies: 3
Views: 206

Re: Issues when switching out a VS1011e with a VS1053B

Hi! Hmm, first of all, wait a little after resetting the VS1053 before you start SCI communication. Secondly, I don't think your SCI commands are getting through. Set less than 1Mbps SPI speed for your SCI commands. Change clock phase, then polarity. Then, set 3X clock. And 0x3000 is quite strange s...
by Panu
Sun 2018-11-11 23:16
Forum: Slave Decoder Applications
Topic: Issues when switching out a VS1011e with a VS1053B
Replies: 3
Views: 206

Re: Issues when switching out a VS1011e with a VS1053B

Hi! I'll take a look at your schematics and read in with thought when I get to the office, but in the mean time, please read the "MCU Howto" link below. Your problems might not even be due to protocol differences between the chips, they might even be due to subtle timing differences on clock edges, ...
by Panu
Fri 2018-11-02 13:16
Forum: VS23S010 Forum
Topic: Color burst problem?
Replies: 8
Views: 461

Re: Color burst problem?

Dear Sir, After checking the design, it seems that your findings are correct, and the levels you have measured are correct. The amplitude of the color signal is less than what I have thought it to be, I am embarrassed to find out. It seems you are the first one to notice this, probably because telev...
by Panu
Thu 2018-11-01 13:25
Forum: VS23S010 Forum
Topic: Color burst problem?
Replies: 8
Views: 461

Re: Color burst problem?

Hi! Hmm, GREAT that you got the color on all of your monitors, but strange that you should have problems... from what I recall from how the design was made, the maximum colorburst swing that the modulator can generate should be 2*63/345*140 IRE = 51.1 IRE. But I've never given it much thought as I'v...
by Panu
Mon 2018-10-29 22:52
Forum: VS23S010 Forum
Topic: Color burst problem?
Replies: 8
Views: 461

Re: Color burst problem?

Hi! Hmm, I looked at the code, and the BURST_LEVEL in that example, in file ntsc.h seems to be 0x0d00 + black level. If you change 0x0d00 to 0x0c00 or 0x0b00, does the amplitude rise sufficiently? Hmm again... when you change the define, check that the compiled code REALLY changes - there's somethin...
by Panu
Mon 2018-10-29 15:35
Forum: Slave Decoder Applications
Topic: VS1053b from the scratch - two questions
Replies: 5
Views: 229

Re: VS1053b from the scratch - two questions

Hi! 1) The MICN pin can be left floating, it is self biasing. Note that digital IO pins generally cannot be left floating. 2) I think they're genuine, I have not seen any counterfeit VS1053 chips produced, but the date code can be old etc. You can check aliexpress, taobao etc, whatever works for you...
by Panu
Tue 2018-10-23 20:36
Forum: VS1010 Forum
Topic: VS1010D sometimes does not see SPI memory.
Replies: 5
Views: 249

Re: VS1010D sometimes does not see SPI memory.

Hi!

Ok, so problem solved now?

-Panu