PCF85162T-1 datasheet(11/46 Pages) NXP

Part #	PCF85162T-1

Description	Universal LCD driver for low multiplex rates

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Manufacturer	NXP [NXP Semiconductors]

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PCF85162

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Product data sheet

Rev. 3 — 16 June 2011

11 of 46

NXP Semiconductors

PCF85162

Universal LCD driver for low multiplex rates

7.4.2 1:2 Multiplex drive mode

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

PCF85162 allows the use of 1⁄2 bias or 1⁄3 bias in this mode as shown in Figure 7 and

Figure 8.

Vstate1(t) = VSn(t)  VBP0(t).

Von(RMS) = 0.791VLCD.

Vstate2(t) = VSn(t)  VBP1(t).

Voff(RMS) = 0.354VLCD.

Fig 7.

Waveforms for the 1:2 multiplex drive mode with 1⁄2 bias

013aaa208

state 1

BP0

(a) Waveforms at driver.

(b) Resultant waveforms

at LCD segment.

LCD segments

state 2

BP1

state 2

state 1

VSS

VLCD

VLCD/2

VSS

VLCD

VSS

VLCD

0 V

VLCD/2

−VLCD

−VLCD/2

Sn

Sn+1

Tfr

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