PCF8545ATT datasheet(9/68 Pages) NXP

9 / 68 page

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

PCF8545 to the other. Backplane swapping is sometimes desirable to aid with the routing

of PCBs that do not use multiple layers.

The BPS bit has to be set to the required value before enabling the display. Failure to do

so does not damage the PCF8545 or the display, however unexpected display content

may appear.

BP0

BP1

BP2

BP3

BP4/S43

BP5/S42

BP6/S41

S39

BP7/S40

S38

S20

S37

S21

S36

S22

S35

S23

S34

S24

S33

S25

S32

S26

S31

S27

S30

S28

S29

S32

S33

S34

S35

S36

S37

S38

BP0

S39

BP1

S20

BP2

S21

BP3

S22

BP4/S43

S23

BP5/S42

S24

BP6/S41

S25

BP7/S40

S26

S31

S27

S30

S28

S29

BPS = 0

BPS = 1

013aaa432

Figure 5. Effect of backplane swapping

7.1.3.2 Line inversion (driving scheme A) and frame inversion (driving scheme B)

The DC offset of the voltage across the LCD is compensated over a certain period: line-

wise in line inversion mode (driving scheme A) or frame-wise in frame inversion mode

(driving scheme B). With the INV bit (see Table 7), the compensation mode can be

switched.

In frame inversion mode, the DC value is compensated across two frames and not

within one frame. Changing the inversion mode to frame inversion reduces the power

consumption; therefore it is useful when power consumption is a key point in the

application.

Frame inversion may not be suitable for all applications. The RMS voltage across a

segment is better defined; however, since the switching frequency is reduced, there is

possibility for flicker to occur.

The waveforms of Figure 14 to Figure 17 are showing line inversion mode. Figure 18

shows an example of frame inversion.

7.1.3.3 Power-down mode

The power-down bit (PD) allows the PCF8545 to be put in a minimum power

configuration. To avoid display artifacts, enter power-down only after the display has

been switched off by setting bit E to logic 0. During power-down, the internal oscillator is

switched off.

PCF8545

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

Product data sheet

Rev. 2 — 4 October 2021

9 / 68

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