PCF8536AT datasheet(20/53 Pages) NXP

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NXP Semiconductors

PCA8551

Automotive 36 × 4 LCD segment driver

8.2.2 LCD drive mode waveforms

8.2.2.1 Static drive mode

The static LCD drive mode is used when a single backplane is provided in the LCD. The

backplane (COMn) and segment (SEGn) drive waveforms for this mode are shown in

Figure 12.

aaa-011867

VSS

VLCD

VSS

VLCD

VSS

VLCD

- VLCD

VLCD

state 1

0 V

COM0

SEGn

SEGn+1

state 2

0 V

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

LCD segments

state 1

(on)

state 2

(off)

Tfr

Vstate1(t) = VSEGn(t) - VCOM0(t).

Von(RMS) = VLCD.

Vstate2(t) = V(SEGn + 1)(t) - VCOM0(t).

Voff(RMS) = 0 V.

Figure 12. Static drive mode waveforms

8.2.2.2 1:2 Multiplex drive mode

When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The

PCA8551 allows the use of 1⁄2 bias or 1⁄3 bias in this mode as shown in Figure 13 and

Figure 14.

PCA8551

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 3.1 — 3 May 2021

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