PCF8545 datasheet(66/68 Pages) NXP

66 / 68 page

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

Tables

Tab. 1.

Ordering information ..........................................2

Tab. 2.

Ordering options ................................................2

Tab. 3.

Pin description of PCF8545ATT and

PCF8545BTT .....................................................6

Tab. 4.

Commands of PCF8545 ....................................7

Tab. 5.

Initialize - initialize command bit description ......7

Tab. 6.

OTP-refresh - OTP-refresh command bit

description ......................................................... 8

Tab. 7.

Mode-settings - mode settings command

bit description ....................................................8

Tab. 8.

Effect of the power-down bit (PD) ................... 10

Tab. 9.

Oscillator-control - oscillator control

command bit description ................................. 11

Tab. 10. Valid combinations of bits OSC, EFR, and

COE .................................................................12

Tab. 11. Typical use of bits OSC, EFR, and COE ......... 12

Tab. 12. OSCCLK pin state depending on

configuration ....................................................13

Tab. 13. LCD frame frequencies ................................... 13

Tab. 14. Set-MUX-mode - set multiplex drive mode

command bit description ................................. 14

Tab. 15. Set-bias-mode - set bias mode command

bit description .................................................. 14

Tab. 16. Frame-frequency - frame frequency and

output clock frequency command bit

description ....................................................... 14

Tab. 17. Frame frequency prescaler values for 230

kHz clock operation .........................................15

Tab. 18. Load-data-pointer - load data pointer

command bit description ................................. 16

Tab. 19. Write-RAM-data - write RAM data

command bit description ................................. 16

Tab. 20. Reset state ......................................................17

Tab. 21. Selection of display configurations .................. 20

Tab. 22. Preferred LCD drive modes: summary of

characteristics ..................................................22

Tab. 23. Backplane and active segment

combinations ................................................... 29

Tab. 24. Control byte description .................................. 35

Tab. 25. I2C target address byte ...................................38

Tab. 26. R/W-bit description ..........................................38

Tab. 27. Status read out value ......................................39

Tab. 28. Modified status read out value ........................ 40

Tab. 29. Serial interface ................................................ 40

Tab. 30. Subaddress byte definition ..............................41

Tab. 31. Limiting values ................................................ 43

Tab. 32. Static characteristics ....................................... 44

Tab. 33. Dynamic characteristics .................................. 47

Tab. 34. Timing characteristics: I2C-bus ....................... 48

Tab. 35. Timing characteristics: SPI-bus .......................50

Tab. 36. Carrier tape dimensions of PCF8545ATT

and PCF8545BTT ........................................... 53

Tab. 37. SnPb eutectic process (from J-STD-020D) ..... 55

Tab. 38. Lead-free process (from J-STD-020D) ............55

Tab. 39. Selection of LCD segment drivers ...................59

Tab. 40. Abbreviations ...................................................62

Tab. 41. Revision history ...............................................63

Figures

Fig. 1.

Block diagram of PCF8545A .............................3

Fig. 2.

Block diagram of PCF8545B .............................4

Fig. 3.

Pin configuration for TSSOP56

(PCF8545ATT) .................................................. 5

Fig. 4.

Pin configuration for TSSOP56

(PCF8545BTT) .................................................. 5

Fig. 5.

Effect of backplane swapping ........................... 9

Fig. 6.

Recommended power-down sequence ........... 10

Fig. 7.

Oscillator selection .......................................... 12

Fig. 8.

Recommended start-up sequence when

using the internal oscillator ............................. 18

Fig. 9.

Recommended start-up sequence when

using an external clock signal ......................... 19

Fig. 10.

Example of displays suitable for PCF8545 ......20

Fig. 11.

Typical system configuration for the I2C-

bus ...................................................................21

Fig. 12.

Typical system configuration for the SPI-

bus ...................................................................21

Fig. 13.

Electro-optical characteristic: relative

transmission curve of the liquid .......................23

Fig. 14.

Waveforms for the 1:4 multiplex drive mode

with 1⁄3 bias and line inversion ....................... 24

Fig. 15.

Waveforms for 1:6 multiplex drive mode

with bias 1⁄3 and line inversion ....................... 25

Fig. 16.

Waveforms for 1:6 multiplex drive mode

with bias 1⁄4 and line inversion ....................... 26

Fig. 17.

Waveforms for 1:8 multiplex drive mode

with bias 1⁄4 and line inversion ....................... 27

Fig. 18.

Waveforms for 1:8 multiplex drive mode

with bias 1⁄4 and frame inversion ....................28

Fig. 19.

Display RAM bitmap ....................................... 30

Fig. 20.

Display RAM filling order in 1:4 multiplex

drive mode ...................................................... 32

Fig. 21.

Boundary condition in 1:4 multiplex drive

mode ............................................................... 32

Fig. 22.

Display RAM filling order in 1:6 multiplex

drive mode ...................................................... 33

Fig. 23.

Boundary condition in 1:6 multiplex drive

mode ............................................................... 34

Fig. 24.

Display RAM filling order in 1:8 multiplex

drive mode ...................................................... 35

Fig. 25.

Control byte format ......................................... 36

Fig. 26.

Bit transfer .......................................................36

Fig. 27.

Definition of START and STOP conditions ...... 37

Fig. 28.

System configuration .......................................37

PCF8545

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Product data sheet

Rev. 2 — 4 October 2021

66 / 68

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