Pirelli DP-L10 display subsystem (was Re: JTAG setup for Pirelli DP-L10)

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ubuntugirl ubuntugirl2013 at gmail.com
Sun Jul 28 22:09:23 UTC 2013

On 7/28/13, Steve Markgraf <steve at 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?


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