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PCF8545ATT Datasheet(PDF) 24 Page - NXP Semiconductors

No. de pieza PCF8545ATT
Descripción Electrónicos  Universal LCD driver for multiplex rates up to 1:8
PDF  68 Pages
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Fabricante Electrónico  NXP [NXP Semiconductors]
Página de inicio  http://www.nxp.com
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PCF8545ATT Datasheet(HTML) 24 Page - NXP Semiconductors

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NXP Semiconductors
PCF8545
Universal LCD driver for multiplex rates up to 1:8
013aaa211
state 1
BP0
(b) Resultant waveforms
at LCD segment.
LCD segments
state 2
BP1
state 1
state 2
BP2
(a) Waveforms at driver.
BP3
Sn
Sn+1
Sn+2
Sn+3
Tfr
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
VSS
VLCD
2VLCD/3
VLCD/3
0 V
VLCD
2VLCD/3
-2VLCD/3
VLCD/3
-VLCD/3
-VLCD
0 V
VLCD
2VLCD/3
-2VLCD/3
VLCD/3
-VLCD/3
-VLCD
VSS
VLCD
2VLCD/3
VLCD/3
Vstate1(t) = VSn(t) - VBP0(t). Vstate2(t) = VSn(t) - VBP1(t).
Von(RMS)(t) = 0.577VLCD. Voff(RMS)(t) = 0.333VLCD.
Figure 14. Waveforms for the 1:4 multiplex drive mode with 1⁄3 bias and line inversion
7.5.2 1:6 Multiplex drive mode
When six backplanes are provided in the LCD, the 1:6 multiplex drive mode applies.
The PCF8545 allows use of 1⁄3 bias or 1⁄4 bias in this mode as shown in Figure 15
and Figure 16. These waveforms are drawn for the case of line inversion (see
Section 7.1.3.2).
PCF8545
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2021. All rights reserved.
Product data sheet
Rev. 2 — 4 October 2021
24 / 68



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