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R OSC

OSC

VSS

SDA

SA0

CLK SYNC

V3

V4

VDD

VLCD

A0

A1

A2

A3

VSS

PCF8579

40

columns

SCL

VSS

SCL

SDA

SA0

CLK SYNC

V3

V4

VDD

V

LCD

PCF8578

VLCD

VDD

V

2

V5

VSS VDD

/

VSS

LCD DISPLAY

VDD

R1

C

R2

C

R3

C

R2

C

R1

C

VSS VDD

/

VLCD

subaddress 1

VSS VDD

/

40 n

columns

n

rows

HOST

MICROCONTROLLER

SCL

SDA

MSA843

Fig.5 Typical mixed mode configuration.