On 7/28/13, Steve Markgraf steve@steve-m.de wrote:
Yes, and it took me a while. The basic 'on/off' is controlled by the SPCA with the code we have, the brightness is controlled by the PWL-unit of the Calypso, but inverted if I remember correctly.
Using your PCB layer pictures, I've traced the PWL signal to the 6-pin IC near the SPCA. The IC label reads "A3-90E", and considering the inductor right next to it, I'm guessing that it's a boost converter for the backlight LED. I'm sure you saw this IC too when you were figuring the BL out - were you perchance able to figure out the full name / part # of this IC, or maybe even find a datasheet for it?
At one point I soldered wires to all connections and hooked them up to a logic analyzer. It's a 16-bit interface and it was quite easy to figure out what was what. For all the initialization only 8 bits are used, for the actual display content you switch to the 16-bit mode.
I thus gather that you had (most of) the actual pinout figured out at some point. Would you perchance still have it somewhere in your notes?
Kim