P83C434CFP datasheet(19/36 Pages) PHILIPS

19 / 36 page

1997 Jul 03

Philips Semiconductors

Product speciﬁcation

8-bit microcontrollers with LCD-driver

P83C434; P83C834

Table 20 Mode selection Segments/Backplanes

Table 21 Selection of display conﬁgurations

Table 22 LCD drive modes and characteristics

Note

1. Multiplex drive ratios of 1 : 3 and 1 : 4 with 1

⁄2 bias are possible, but the discrimination contrast ratios are reduced;

for 1 : 3, D = 1.732 and for 1 : 4, D = 1.528. However, there is an advantage that leads to reduction of Vop as follows:

a) for 1 : 3 multiplex (1

⁄2 bias), Vop = 2.449 × Voff(rms).

b) For 1 : 4 multiplex (1

⁄2 bias), Vop = 2.309 × Voff(rms).

This compared to Vop =3 × Voff(rms) when 1⁄3 bias is used.

MULTIPLEX RATIO

SEGMENTS

BACKPLANES

1 : 1 (static)

S00 to S21, S22/BP3, S23/BP2

BP0

1 : 2

S00 to S21, S22/BP3, S23/BP2

BP0, BP1

1 : 3

S00 to S21, S22/BP3

BP0, BP1, S23BP2

1 : 4

S00 to S21

BP0, BP1, S23/BP2, S22/BP3

NUMBER OF

7-SEGMENTS NUMERIC

14-SEGMENTS

ALPHANUMERIC

DOT MATRIX

BACKPLANES SEGMENTS

DIGITS

INDICATOR

SYMBOLS

CHARACTERS

INDICATOR

SYMBOLS

88 dots (4

× 22)

69 dots (3

× 23)

48 dots (2

× 24)

24 dots (1

× 24)

LCD DRIVE MODE

NUMBER OF

LCD BIAS

CONFIGURATION

BACKPLANES

LEVELS

static

∞

1:2

⁄2

0.354

0.791

2.236

1:2

⁄3

0.333

0.745

2.236

1:3(1)

⁄3

0.333

0.638

1.915

1:4(1)

⁄3

0.333

0.577

1.7321

off(rms)

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

on(rms)

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

on(rms)

off(rms)

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

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