lc75857e Sanyo Semiconductor Corporation, lc75857e Datasheet - Page 13

• Manufacturer Part Number: lc75857e
• Description: 1/3, 1/4 Duty Lcd Display Drivers With Key Input Function
• Manufacturer: Sanyo Semiconductor Corporation

5. P0 to P2 : Segment output port/general-purpose output port selection data
Note: Sn(n=1 to 4): Segment output port
6. SC : Segment on/off control data
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
8. DT : 1/3 duty or 1/4 duty drive selection data
Note: COM4: Common output
P0
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.
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 (V
(Vss) when D13 is 0.
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.
This control data bit controls the on/off state of the segments.
This control data bit switches between LCD 1/2 bias or 1/3 bias drive.
This control data bit switches between LCD 1/3 duty or 1/4 duty drive.
0
0
0
0
1
Output pin
S39
Pn(n=1 to 4): General-purpose output port
S1/P1
S2/P2
S3/P3
S4/P4
SC
DR
DT
Control data
0
1
0
1
0
1
: Segment output
P1
0
0
1
1
0
P2
0
1
0
1
0
Duty drive scheme
Bias drive scheme
1/3 bias drive
1/2 bias drive
1/4 duty drive
1/3 duty drive
Display state
1/3 duty
S1/P1
D10
D1
D4
D7
on
off
S1
P1
P1
P1
P1
Corresponding display data
S2/P2
Output pin state
S2
S2
P2
P2
P2
Output pin state (COM4/S39)
S3/P3
S3
S3
S3
P3
P3
LC75857E, LC75857W
1/4 duty
COM4
S39
D13
S4/P4
D1
D5
D9
S4
S4
S4
S4
P4
LCD
) when the display data D13 is 1, and will output a low level
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