LC75897PW Datasheet, PDF (18/34 Pages) Sanyo Semicon Device – 1/3, 1/4-Duty General-Purpose LCD Display Driver

LC75897PW
(6) DT: 1/3 duty drive or 1/4 duty drive switching control data
This control data bit selects either 1/3 duty drive or 1/4 duty drive.
DT
Duty drive scheme
Output pin state (COM4/S129)
0
1/4 duty drive
COM4
1
1/3 duty drive
S129
Note: COM4: Common output
S129: Segment output
(7) OC: RC oscillator operating mode/external clock operating mode switching control data
This control data bit selects either RC oscillator operating mode or external clock operating mode.
OC
OSC pin function
0
RC oscillator operating mode
1
External clock operating mode
Note: When selecting the RC oscillator operating mode, be sure to connect an external resistor Rosc and an external
capacitor Cosc to the OSC pin.
(8) FC0 to FC2: Common and segment output waveforms frame frequency setting control data
This control data bits set the frame frequency for the common and segment output waveforms.
Control data
FC0
FC1
FC2
Common/segment output waveform
frame frequency fo [Hz]
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
fosc/6144, fCK/6144
fosc/4608, fCK/4608
fosc/3072, fCK/3072
fosc/2304, fCK/2304
fosc/1536, fCK/1536
(9) PF0 to PF2: PWM output waveforms frame frequency setting control data
This control data bits set the frame frequency for the PWM output waveforms.
Control data
PF0
PF1
PF2
PWM output waveform
frame frequency fp [Hz]
0
0
0
1
0
0
0
1
0
1
1
0
0
0
1
1
0
1
0
1
1
1
1
1
fosc/1536, fCK/1536
fosc/1408, fCK/1408
fosc/1280, fCK/1280
fosc/1152, fCK/1152
fosc/1024, fCK/1024
fosc/896, fCK/896
fosc/768, fCK/768
fosc/640, fCK/640
(10) SC: Segments 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 the segments are turned off by setting SC to 1, the segments are turned off by outputing segment off
waveforms from the segment output pins.
(11) BU: Normal mode/power-saving mode control data
This control data bit selects either normal mode or power-saving mode.
BU
Mode
0
Normal mode
Power save mode
The LC75897PW stops the oscillation at the OSC pin if it is set up for the RC oscillator operating mode (OC = 0) and stops
receiving the external clock if it is set up for the external clock operating mode (OC = 1). The IC also sets the common and
1
segment output pins to the VSS level. The output pins S1/P1 to S8/P8, however, remain available as general-purpose
output ports as configured by control data bits PS10, PS11, PS20, PS21, PS30, PS31, PS40, PS41, and PS5 to PS8 (not
available as PWM output or clock output ports).
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