PCF8534AHLSLASH1 datasheet(9/47 Pages) NXP

9 / 47 page

PCF8534A_5

Product data sheet

Rev. 05 — 6 August 2009

9 of 47

NXP Semiconductors

PCF8534A

Universal LCD driver for low multiplex rates

conﬁgurations that apply to the preferred modes of operation, together with the biasing

characteristics as functions of VLCD and the resulting discrimination ratios (D), are given in

Table 5.

A practical value for VLCD is determined by equating Voff(RMS) with a deﬁned LCD

threshold voltage (Vth), typically when the LCD exhibits approximately 10 % contrast. In

the static drive mode a suitable choice is VLCD >3 × Vth.

Multiplex drive modes of 1:3 and 1:4 with 1

⁄2 bias are possible but the discrimination and

hence the contrast ratios are smaller.

Bias is calculated by

, where the values for a are

a = 1 for 1

⁄2 bias

a = 2 for 1

⁄3 bias

The RMS on-state voltage (Von(RMS)) for the LCD is calculated with Equation 1:

(1)

where the values for n are

n = 1 for static mode

n = 2 for 1:2 multiplex

n = 3 for 1:3 multiplex

n = 4 for 1:4 multiplex

The RMS off-state voltage (Voff(RMS)) for the LCD is calculated with Equation 2:

(2)

Discrimination is the ratio of Von(RMS) to Voff(RMS) and is determined from Equation 3:

(3)

Table 5.

Discrimination ratios

LCD drive

mode

Number of:

LCD bias

conﬁguration

Backplanes

Levels

static

∞

1:2 multiplex

⁄

0.354

0.791

2.236

1:2 multiplex

⁄

0.333

0.745

2.236

1:3 multiplex

⁄

0.333

0.638

1.915

1:4 multiplex

⁄

0.333

0.577

1.732

off RMS

()

LCD

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

on RMS

()

LCD

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

on RMS

()

off RMS

()

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

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

on RMS

()

---

–

()

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

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





LCD

off RMS

()

–

()

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

LCD

on RMS

()

off RMS

()

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

()

–

()

–

()

–

()

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

PCF8534AHL/1 датащи(PDF) 9 Page - NXP Semiconductors

PCF8534AHL/1 датащи(HTML) 9 Page - NXP Semiconductors

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 42 43 44 45 46 47

датащи скачать

ссылки URL