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Fig.15 Direct display driver; expansion to 256 segments using eight PCF8577Cs.

MGA735

VDD

VSS

SDA

SCL

A0

A1

BP2

BP1

S32

S31

S1

S2

PCF8577C

OSC

A2

Cosc

Rosc

VDD

VSS

SDA

SCL

device subaddress

A2.A1.A0 = 000

VDD

VSS

SDA

SCL

A0

A1

BP2

BP1

S32

S31

S1

S2

PCF8577C

OSC

A2

device subaddress

A2.A1.A0 = 001

VDD

VSS

SDA

SCL

A0

A1

BP2

BP1

S32

S31

S1

S2

PCF8577C

OSC

A2

device subaddress

A2.A1.A0 = 111

256

64

33

32

1

backplane

DIRECT DRIVE LCD DISPLAY