PCF8576DH/2 データシートの表示（PDF） - Philips Electronics

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PCF8576DH/2

Universal LCD driver for low multiplex rates

Philips Electronics 

Philips Semiconductors

Universal LCD driver for low

multiplex rates

Product specification

PCF8576D

Table 2 Discrimination ratios

LCD DRIVE MODE

static

1 : 2 multiplex

1 : 2 multiplex

1 : 3 multiplex

1 : 4 multiplex

NUMBER OF

LCD BIAS

BACKPLANES LEVELS CONFIGURATION

1

2

static

2

3

1⁄2

2

4

1⁄3

3

4

1⁄3

4

4

1⁄3

V-----oV---f-f-l-(c-r--md----s--)

0

0.354

0.333

0.333

0.333

V-----oV--n---l(-c-r--md----s--)

1

0.791

0.745

0.638

0.577

D = V-V----oo--f-n-f-(-(-rr--mm----ss--))

∞

2.236

2.236

1.915

1.732

6.4 LCD drive mode waveforms

6.4.1 STATIC DRIVE MODE

The static LCD drive mode is used when a single backplane is provided in the LCD. The backplane (BPn) and segment

drive (Sn) waveforms for this mode are shown in Fig.4.

handbook, full pagewidth

Von(rms) = VLCD

Vstate2(t)

=

VSn

+

(t)

1

–

VBP0(t)

Voff(rms) = 0 V

Tframe

VLCD

BP0

VSS

VLCD

Sn

VSS

LCD segments

state 1

(on)

state 2

(off)

Sn + 1

VLCD

VSS

(a) Waveforms at driver.

VLCD

state 1 0 V

−VLCD

VLCD

state 2 0 V

−VLCD

(b) Resultant waveforms

at LCD segment.

MGL745

Fig.6 Static drive mode waveforms.

2004 Dec 22

11

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