PCF8545 datasheet(68/68 Pages) NXP

68 / 68 page

NXP Semiconductors

PCF8545

Universal LCD driver for multiplex rates up to 1:8

Contents

General description ............................................ 1

Features and benefits .........................................1

Applications .........................................................1

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

4.1

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

Block diagram ..................................................... 3

Pinning information ............................................ 4

6.1

Pinning ...............................................................4

6.2

Pin description ................................................... 6

Functional description ........................................7

7.1

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

7.1.1

Command: initialize ........................................... 7

7.1.2

Command: OTP-refresh .................................... 8

7.1.3

Command: mode-settings ..................................8

7.1.3.1

Backplane swapping ..........................................8

7.1.3.2

Line inversion (driving scheme A) and

frame inversion (driving scheme B) ................... 9

7.1.3.3

Power-down mode .............................................9

7.1.3.4

Display enable ................................................. 11

7.1.4

Command: oscillator-control ............................ 11

7.1.4.1

Oscillator ..........................................................12

7.1.4.2

Timing and frame frequency ............................13

7.1.5

Command: set-MUX-mode .............................. 14

7.1.6

Command: set-bias-mode ............................... 14

7.1.7

Command: frame-frequency ............................ 14

7.1.8

Command: load-data-pointer ........................... 16

7.1.9

Command: write-RAM-data ............................. 16

7.2

Start-up and shut-down ................................... 16

7.2.1

Reset and Power-On Reset (POR) ..................16

7.2.2

RESET pin function ......................................... 17

7.2.3

Recommended start-up sequences .................17

7.3

Possible display configurations ........................20

7.4

LCD voltage selector ....................................... 21

7.4.1

Electro-optical performance .............................23

7.5

LCD drive mode waveforms ............................ 23

7.5.1

1:4 Multiplex drive mode ................................. 23

7.5.2

1:6 Multiplex drive mode ................................. 24

7.5.3

1:8 Multiplex drive mode ................................. 27

7.6

Display register ................................................29

7.7

Backplane outputs ........................................... 29

7.8

Segment outputs ............................................. 29

7.9

Display RAM ....................................................29

7.9.1

Data pointer ..................................................... 31

7.9.2

RAM filling in 1:4 multiplex drive mode ............31

7.9.3

RAM filling in 1:6 multiplex drive mode ............32

7.9.4

RAM filling in 1:8 multiplex drive mode ............34

Bus interfaces ................................................... 35

8.1

Control byte and register selection .................. 35

8.2

I2C-bus interface ............................................. 36

8.2.1

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

8.2.2

START and STOP conditions .......................... 36

8.2.3

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

8.2.4

Acknowledge ....................................................37

8.2.5

I2C-bus controller ............................................ 38

8.2.6

Input filters .......................................................38

8.2.7

I2C-bus target address ....................................38

8.2.8

I2C-bus protocol .............................................. 39

8.2.8.1

Status read out ................................................39

8.3

SPI-bus interface ............................................. 40

8.3.1

Data transmission ............................................40

Internal circuitry ................................................42

Safety notes .......................................................42

Limiting values ..................................................43

Static characteristics ........................................44

Dynamic characteristics ...................................47

Package outline .................................................52

Handling information ........................................ 53

Packing information ..........................................53

16.1

Tape and reel information ................................53

Soldering of SMD packages .............................53

17.1

Introduction to soldering .................................. 54

17.2

Wave and reflow soldering .............................. 54

17.3

Wave soldering ................................................54

17.4

Reflow soldering .............................................. 54

Footprint information for reflow soldering ..... 57

Appendix ............................................................58

19.1

LCD segment driver selection ......................... 58

Abbreviations .................................................... 62

References .........................................................62

Revision history ................................................ 63

Legal information ..............................................64

Please be aware that important notices concerning this document and the product(s)

described herein, have been included in section 'Legal information'.

For more information, please visit: http://www.nxp.com

For sales office addresses, please send an email to: salesaddresses@nxp.com

Date of release: 4 October 2021

Document identifier: PCF8545

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