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ST7541 Datasheet(PDF) 22 Page - Sitronix Technology Co., Ltd.

Part # ST7541
Description  4 Gray Scale Dot Matrix LCD Controller/Driver
PDF  78 Pages
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Manufacturer  SITRONIX [Sitronix Technology Co., Ltd.]
Direct Link  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST7541 Datasheet(HTML) 22 Page - Sitronix Technology Co., Ltd.

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ST7541
Ver 1.9
22/78
2007/9/3
Oscillator
This is on-chip Oscillator without external resistor. When the internal oscillator is used, this pin must connect to VDD; when
the external oscillator is used, this pin could be input pin. This oscillator signal is used in the voltage converter and display
timing generation circuit.
Display Timing Generator Circuit
This circuit generates some signals to be used for displaying LCD. The display clock, CL (internal), generated by oscillation
clock, generates the clock for the line counter and the signal for the display data latch. The line address of on-chip RAM is
generated in synchronization with the display clock and the display data latch circuit latches the 128-bit display data in
synchronization with the display clock. The display data, which is read to the LCD driver, is completely independent of the
access to the display data RAM from the microprocessor. The display clock generates an LCD AC signal (M) which enables
the LCD driver to make an AC drive waveform, and also generates an internal common timing signal and start signal to the
common driver. The frame signal or the line signal changes the M by setting internal instruction. Driving waveform and
internal timing signal are shown in Figure 11.
FR(Internal)
M(Internal)
COM0
COM1
SEGn
CL(Internal)
V
1
V
2
V
3
V
4
V
SS
V0
V
1
V
2
V
3
V
4
V
SS
V0
V
1
V
2
V
3
V
4
V
SS
V0
128 129
12345
6
78
9
10
11
12
121 122 123 124 125 126 127 128 129 123
45
Figure 11 2-frame AC Driving Waveform (Duty Ratio: 1/129)
CL(Internal)
FR(Internal)
M(Internal)
COM0
COM1
SEGn
V0
V
1
V
2
V
3
V
4
V
ss
V0
V
1
V
2
V
3
V
4
V
ss
V0
V
1
V
2
V
3
V
4
V
ss
128
129
123
4
567
8
9
10
11
124
3
2
1
129
128
127
126
125
124
123
122
121
120
Figure 12 N-Line Inversion Driving Waveform (N=5,Duty Ratio=1/129)



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