Matt Pobursky wrote:

>> It's almost certainly a negative bias voltage generator for use with
>> extended temperature glass on the same PCB

Joe wrote:

> That might be so. I've got LCDs with unused pads for inverters
> like the Epson SCI7661 (14 pin SMT)
>
> I have some RT-C1602L-P1 with the same pads, but not the
> S1 & S2 bridges. The datasheet, similar to this one,
>
> http://oomlout.com/LCDD/LCDD-DATA-BC1602A.pdf
>
> says LCDs with 3V logic require -3V for the contrast control
>
> You could see if the SCI7660 fits your board

Many thanks guys.  The chip in question does indeed appear to be the
7660 used to generate a negative voltage.

-p.
--=20
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