SSD1789A Solomon Systech, SSD1789A Datasheet - Page 50

• Manufacturer Part Number: SSD1789A
• Description: CSTN LCD Driver
• Manufacturer: Solomon Systech

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OTP Example program
Find the OTP offset:
1.
2.
3.
4.
5.
6.
7.
OTP programming:
8.
9.
10.
11.
12.
13.
14.
Verify the result:
15.
Solomon Systech
Hardware reset by sending an active low reset pulse to
COMMAND(0XD1);
COMMAND(0X94);
COMMAND(0X20);
DATA(0x0F);
COMMAND(0XFB)
DATA(0X2)
COMMAND(0X81)
DATA(0X14)
DATA(0X05)
\\ Set target display contents
COMMAND(0X15)
DATA(0x00)
DATA(0X83)
COMMAND(0X75)
DATA(0X00)
DATA(0X83)
COMMAND(0X5C)
DATA(…)
COMMAND(0xAF)
OTP offset calculation… target OTP offset value is +3
Hardware reset by sending an active low reset pulse to
COMMAND(0XD1)
COMMAND(0x94)
Connect a external V
COMMAND(0XF6)
DATA(0X11)
DATA(0x2A)
COMMAND(0XF8)
Wait at least 2 seconds for programming wait time.
After OTP programming, procedure 2 to 5 are repeated for inspection of the contrast on the panel.
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\\ 00011 X
OUT
\\Enable oscillator;
\\ exit sleep mode;
\\ turn on the reference voltage generator, internal regulator and voltage follower; Select booster level.
\\ Set Biasing ratio
\\ 1/9
\\Set target gain and contrast.
\\ contrast = 20
\\ Internal Regulator Gain = 11.57
\\ set column address
\\ set start column address at 0
\\ set end column address at 131
\\ set page address
\\ set start page address at 0
\\ set end page address at 131
\\ write target content to GDDRAM
\\ display on
\\ Enable Oscillator
\\ Exit Sleep Mode
\\ Set OTP offset value to +3 (0011)
\\ Send the OTP programming command.
(14.5V~15.5V)
3
X
2
X
1
X
0
Y
5
, where X
3
X
2
X
1
X
RES
RES
0
Y
5
is the OTP offset value
pin
pin
Jul 2004
P 50/69 Rev 1.0
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