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HT16K23

RAM Mapping 20*4/16*8 LCD Controller Driver with keyscan

Table of Contents

Feature ........................................................................................................................... 4

Applications................................................................................................................... 4

General Description ...................................................................................................... 4

Block Diagram ............................................................................................................... 5

Pin Assignment ............................................................................................................. 5

Pad Coordinates............................................................................................................ 6

Pad Assignment ............................................................................................................ 6

Pin Description .............................................................................................................. 7

Approximate Internal Connections.............................................................................. 8

Absolute Maximum Ratings ......................................................................................... 8

D.C. Characteristics ...................................................................................................... 9

A.C. Characteristics .................................................................................................... 10

A.C. Characteristics .................................................................................................... 10

Timing Diagrams ......................................................................................................... 11

Functional Description ............................................................................................... 11

Powe�-on Reset .................................................................................................................11

Standby �ode....................................................................................................................1�

Wake-up.............................................................................................................................1�

System Set Command ................................................................................................ 13

Mode Set Command.................................................................................................... 13

System Os�illato� ...............................................................................................................13

LCD Bias Gene�ato�...........................................................................................................14

Segment D�ive� Outputs.....................................................................................................14

Common D�ive� Outputs ....................................................................................................14

Display �emo�y – RA� St�u�tu�e......................................................................................14

LCD D�ive �ode Wavefo�ms..............................................................................................16

Keyscan........................................................................................................................ 18

Keys�an and INT Timing ....................................................................................................18

Key Matrix Configuration............................................................................................ 19

Key Data Register........................................................................................................ 19

Key scan period setting Command ........................................................................... 20

T�e setting of key s�an pe�iod ...........................................................................................�0

T�e �elations�ip of display pe�iod and key s�an pe�iod .....................................................�0