PCF8566
NXP Semiconductors
Universal LCD driver for low multiplex rates
21
• 1:4 multiplex with 1⁄2 bias is ---------- = 1.528
3
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage VLCD
as follows:
• 1:3 multiplex (1⁄2 bias): V LCD
=
6 × V off (RMS) = 2.449V off (RMS)
(4 × 3)
• 1:4 multiplex (1⁄2 bias): V LCD
=
= 2.309V off (RMS)
---------------------
3
These compare with V LCD = 3V off (RMS) when 1⁄3 bias is used.
It should be noted that VLCD is sometimes referred as the LCD operating voltage.
PCF8566_7
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 25 February 2009
9 of 48
NXP [ NXP ]
