On Fri, 8 Aug 1997 16:56:02 -0400 Andy Kunz <montana@FAST.NET> writes:
>At 10:17 PM 8/8/97 GMT+0200, you wrote:
>>Hi,
>>
>>I want to use a Hitachi LCD display (2*16) in a battery operated PIC
>>project.  I was thinking of using three 1.5V cells.  Unfortuntely I
>>cannot find any mention of the minimum supply voltage for the LCD
>module
>>in the Hitachi docs.  Does anybody know what the minimum operating
>>voltage is?
>
>I've used it down to 3.3 V.  No specs though.

Hitichi says logic power supply (Vdd - Vss) of 4.75 to 5.25V operating,
6.5V absolute maximum.  I've never tried away from 5.  You may need to
apply negative voltage to the Vo pin to get enough display contrast with
low Vdd (this is determined by the LCD panel itself, which sees Vdd-Vo as
its peak operating voltage).