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R

OSC

OSC

VSS

SCL SDA SA0

CLK

SYNC

V3

V4

VDD

VLCD

A0

A1

A2

A3

VSS

VSS

PCF8579

1

40

columns

subaddress 0

VSS

SCL

SDA

SA0

CLK SYNC

V3

V4

VDD

V

LCD

PCF8578

(ROW MODE)

VLCD

VDD

V2

V5

VSS

unused columns

8

SCL

SDA

V DD

VSS

32

rows

R

R

R

R

C

C

C

C

C

VSS

SCL SDA SA0

CLK

SYNC

V3

V4

VDD

VLCD

A0

A1

A2

A3

VSS

VSS

PCF8579

2

40

columns

subaddress 1

VDD

VSS

SCL SDA SA0

CLK

SYNC

V3

V4

V DD

VLCD

A0

A1

A2

A3

VSS

VSS

PCF8579

k

40

columns

VDD

subaddress k 1

1:32 multiplex rate

32 x 40 x k dots (k

16)

(20480 dots max.)

LCD DISPLAY

VDD

(4 2 3)R

VSS

MSA845

Fig.20 Typical LCD driver system with 1 : 32 multiplex rate.