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PCF8566P Datasheet(PDF) 11 Page - NXP Semiconductors |
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PCF8566P Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 48 page PCF8566_7 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 07 — 25 February 2009 11 of 48 NXP Semiconductors PCF8566 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 PCF8566 allows the use of 1 ⁄ 2 bias or 1 ⁄ 3 bias (see Figure 6 and Figure 7). Vstate1(t) = VSn(t) − VBP0(t). Von(RMS) = 0.791VLCD. Vstate2(t) = VSn(t) − VBP1(t). Voff(RMS) = 0.354VLCD Fig 6. Waveforms for the 1:2 multiplex drive mode with 1 ⁄2 bias mgl746 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 VSS VLCD VLCD VSS VLCD VLCD VLCD 0 V 0 V VLCD / 2 VLCD / 2 VLCD / 2 −VLCD −VLCD −VLCD / 2 −VLCD / 2 S n Sn+1 Tfr |
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