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ST7541 Datasheet(PDF) 21 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) 21 Page - Sitronix Technology Co., Ltd.

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ST7541
Ver 1.9
21/78
2007/9/3
LCD DISPLAY CIRCUITS
FRC (Frame Rate Control) and PWM (Pulse Width Modulation) Function Circuit
ST7541 incorporates FRC function and PWM circuits to display a 4-level gray scale. The FRC function and PWM utilize
liquid crystal characteristics whose transmittance is changed by an effective value of applied voltage. ST7541 provides
palette-registers to assign the desired gray level. These registers are set by the instructions and the RST.
4FRC & 3FRC vs. 9PWM, 12PWM, 15PWM
– Gray Scale Table of 4 FRC (Frame Rate Control)
Gray scale level
MSB (DB7 to DB4)
LSB (DB3 to DB0)
2nd FR (FR2)
1st FR (FR1)
White
4th FR (FR4)
3rd FR (FR3)
2nd FR (FR2)
1st FR (FR1)
Light gray
4th FR (FR4)
3rd FR (FR3)
2nd FR (FR2)
1st FR (FR1)
Dark gray
4th FR (FR4)
3rd FR (FR3)
2nd FR (FR2)
1st FR (FR1)
Black
4th FR (FR4)
3rd FR (FR3)
– Gray Scale Table of 3 FRC (Frame Rate Control)
Gray scale level
MSB (DB7 to DB4)
LSB (DB3 to DB0)
2nd FR (FR2)
1st FR (FR1)
White
XXXX
3rd FR (FR3)
2nd FR (FR2)
1st FR (FR1)
Light gray
XXXX
3rd FR (FR3)
2nd FR (FR2)
1st FR (FR1)
Dark gray
XXXX
3rd FR (FR3)
2nd FR (FR2)
1st FR (FR1)
Black
XXXX
3rd FR (FR3)
– Gray Scale Table of PWM (Pulse Width Modulation)
Frame Parameter (FRn)
15-PWM
12-PWM
9-PWM
Dec
Hex
4-bit
PWM width
Note
PWM width
Note
PWM width
Note
0
00
0000
0(0/15)
Brighter
0(0/12)
Brighter
0(0/9)
Brighter
1
01
0001
1/15
1/12
1/9
2
02
0010
2/15
2/12
2/9
3
03
0011
3/15
3/12
3/9
4
04
0100
4/15
4/12
4/9
5
05
0101
5/15
5/12
5/9
6
06
0110
6/15
6/12
6/9
7
07
0111
7/15
7/12
7/9
8
08
1000
8/15
8/12
8/9
9
09
1001
9/15
9/12
1(9/9)
Darker
10
0A
1010
10/15
10/12
11
0B
1011
11/15
11/12
12
0C
1100
12/15
1(12/12)
Darker
13
0D
1101
13/15
14
0E
1110
14/15
15
0F
1111
1(15/15)
Darker
0/12
This field is
OFF level
0/9
This field is
OFF level



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