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Fig 21. Typical LCD driver system with 1:32 multiplex rate

Rext(OSC)

OSC

SCL SDA SA0

CLK

SYNC

A0

A1

A2

A3

PCF8579

#1

40

columns

subaddress 0

SCL

SDA

SA0

CLK SYNC

PCF8578

(ROW MODE)

VSS

VSS

unused columns

8

SCL

SDA

32

rows

R

R

R

R

C

C

C

C

C

SCL SDA SA0

CLK

SYNC

A0

A1

A2

A3

PCF8579

#2

40

columns

subaddress 1

SCL SDA SA0

CLK

SYNC

A0

A1

A2

A3

PCF8579

#k

40

columns

subaddress k

−1

1:32 multiplex rate

32

× 40 × k dots (k ≤ 16)

(20480 dots max.)

LCD DISPLAY

(4 2 3)R

msa845