PCF8579 datasheet(8/41 Pages) NXP

Part #	PCF8579

Description	LCD column driver for dot matrix graphic displays

Download	41 Pages

Scroll/Zoom	100%

Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

Logo

8 / 41 page

PCF8579_5

Product data sheet

Rev. 05 — 11 May 2009

8 of 41

NXP Semiconductors

PCF8579

LCD column driver for dot matrix graphic displays

Remark: Do not transfer data on the I2C-bus for at least 1 ms after power-on to allow the

reset action to complete.

8.2 Multiplexed LCD bias generation

The bias levels required to produce maximum contrast depend on the multiplex rate and

the LCD threshold voltage (Vth). Vth is typically deﬁned as the RMS voltage at which the

LCD exhibits 10 % contrast. Table 4 shows the optimum voltage bias levels and Table 5

the discrimination ratios (D) for the different multiplex rates as functions of Voper.

(1)

The RMS on-state voltage (Von(RMS)) for the LCD is calculated with the equation

(2)

and the RMS off-state voltage (Voff(RMS)) with the equation

(3)

where the values for n are determined by the multiplex rate (1:n). Valid values for n are:

n = 8 for 1:8 multiplex

n = 16 for 1:16 multiplex

n = 24 for 1:24 multiplex

n = 32 for 1:32 multiplex

Table 4.

Optimum LCD voltages

Bias ratios

Multiplex rate

1:8

1:16

1:24

1:32

0.739

0.800

0.830

0.850

0.522

0.600

0.661

0.700

0.478

0.400

0.339

0.300

0.261

0.200

0.170

0.150

V

oper

V

DD

V

LCD

–

=

V

on RMS

()

1

n

---

n1

–

nn

1

+

()

------------------------

+

V

oper

=

V

off RMS

()

2n

1

–

()

nn

1

+

()2

-------------------------------

V

oper

=

V

2

V

oper

--------------

V

3

V

oper

--------------

V

4

V

oper

--------------

V

5

V

oper

--------------

Similar Part No. - PCF8579

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCF8579	287Kb / 40P	LCD column driver for dot matrix graphic displays 1997 Apr 01
	PCF8579	727Kb / 8P	Smart, simple solutions for the 12 most common design concerns August 2011
	PCF8579H	287Kb / 40P	LCD column driver for dot matrix graphic displays 1997 Apr 01
	PCF8579T	287Kb / 40P	LCD column driver for dot matrix graphic displays 1997 Apr 01
	PCF8579U7	287Kb / 40P	LCD column driver for dot matrix graphic displays 1997 Apr 01

More results

Similar Description - PCF8579

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCF8579	287Kb / 40P	LCD column driver for dot matrix graphic displays 1997 Apr 01
	PCF8578	323Kb / 44P	LCD row/column driver for dot matrix graphic displays 1998 Sep 08
	PCF8578	284Kb / 46P	LCD row/column driver for dot matrix graphic displays Rev. 06-5 May 2009
	PCF8578	261Kb / 48P	LCD row/column driver for dot matrix graphic displays 2003 Apr 14
Toshiba Semiconductor	T6K01	238Kb / 13P	COLUMN DRIVER LSI FOR A DOT MATRIX GRAPHIC LCD
	T7932	887Kb / 20P	COLUMN DRIVER LSI FOR A DOT MATRIX GRAPHIC LCD
	T6B65AFG	472Kb / 15P	Column Driver LSI for Dot Matrix Graphic LCD?셲
	T6K14	593Kb / 45P	COLUMN AND ROW DRIVER LSI FOR A DOT MATRIX GRAPHIC LCD
	T6B07	438Kb / 10P	COLUMN DRIVER FOR A DOT MATRIX LCD
	T6A04A	307Kb / 25P	Column and Row Driver LSI for a Dot Matrix Graphic LCD

More results

PCF8579 Datasheet(PDF) 8 Page - NXP Semiconductors

PCF8579 Datasheet(HTML) 8 Page - NXP Semiconductors

Similar Part No. - PCF8579

Similar Description - PCF8579

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

Datasheet Download

Link URL