LC75857E View Datasheet(PDF) - ON Semiconductor

Part Name

Description

Manufacturer

LC75857E

1/3, 1/4 Duty LCD Driver with Key Input Function

ON Semiconductor 

LC75857E, LC75857W

5. P0 to P2 : Segment output port/general-purpose output port selection data

These control data bits switch the functions of the S1/P1 to S4/P4 output pins between the segment output port and

the general-purpose output port.

Control data

P0

P1

P2

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

S1/P1

S1

P1

P1

P1

P1

Output pin state

S2/P2 S3/P3

S2

S3

S2

S3

P2

S3

P2

P3

P2

P3

S4/P4

S4

S4

S4

S4

P4

Note: Sn(n=1 to 4): Segment output port

Pn(n=1 to 4): General-purpose output port

The table below lists the correspondence between the display data and the output pins when these pins are selected to

be general-purpose output ports.

Output pin

Corresponding display data

1/3 duty

1/4 duty

S1/P1

D1

D1

S2/P2

D4

D5

S3/P3

D7

D9

S4/P4

D10

D13

For example, if the circuit is operated in 1/4 duty and the S4/P4 output pin is selected to be a general-purpose output

port, the S4/P4 output pin will output a high level (VLCD) when the display data D13 is 1, and will output a low level

(Vss) when D13 is 0.

6. SC : Segment on/off control data

This control data bit controls the on/off state of the segments.

SC

Display state

0

on

1

off

However, note that when the segments are turned off by setting SC to 1, the segments are turned off by outputting

segment off waveforms from the segment output pins.

7. DR : 1/2 bias or 1/3 bias drive selection data

This control data bit switches between LCD 1/2 bias or 1/3 bias drive.

DR

Bias drive scheme

0

1/3 bias drive

1

1/2 bias drive

8. DT : 1/3 duty or 1/4 duty drive selection data

This control data bit switches between LCD 1/3 duty or 1/4 duty drive.

DT

Duty drive scheme

0

1/4 duty drive

1

1/3 duty drive

Note: COM4: Common output

S39 : Segment output

Output pin state (COM4/S39)

COM4

S39

No. 7980-13/39

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