IanM wrote in message
...
N_Cook wrote:
From this odd named file
http://www.sh2a.com/Microsoft%20Word%20-%202A-cmos.pdf
and pins 1,2,3,4, 7 tied to Vss and p8 Vdd , then the 8 pinner marked
U274
16B-1
probably an EEPROM but why ? NTSC/PAL selection would surely be just
taking
some pin high or low on the 48 pinner. Contrast and brightness carried
i2c
to the front end? will check later today



That PDF is for a USB camera which would need VID and PID info from
somewhere, hence the EEPROM. Your one's VIMICRO VC0703 chip is
configurable for a lot more than just PAL/NTSC. I would expect the OSD
feature alone to need an EEPROM to store the text and the rest of the
config might as well be kept in the same chip.

--
Ian Malcolm. London, ENGLAND. (NEWSGROUP REPLY PREFERRED)
ianm[at]the[dash]malcolms[dot]freeserve[dot]co[dot]uk
[at]=@, [dash]=- & [dot]=. *Warning* HTML & 32K emails -- NUL:


there is only 4 wires between this camera pcb , down the 1m long spiral
trunking to the monitor etc, 0,3.3V, illumination LED supply (variable), and
CVBS signal out.