SSD1789A Solomon Systech, SSD1789A Datasheet - Page 48

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

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Figure 15 - OTP programming circuitry
Solomon Systech
SSD1789A
Step 2. OTP programming
V
RES
Example 1:
Contrast value of original initialization = 0x20
Contrast value of the best original initialization = 0x24
OTP offset value = 0x24 - 0x20 = +4
OTP setting command should be (C: 0xF6, D: 0x12, D: 0x0A)
Example 2:
Contrast value of original initialization = 0x20
Contrast value of the best original initialization = 0x1B
OTP setting = 0x1B - 0x20 = -5
OTP setting command should be (C:0xF6, D: 0x1D, D: 0x2A)
Step 1. Find OTP offset
(1) Hardware Reset (sending an active low reset pulse to
(2) Send original initialization routines
(3) Set and display any test patterns
(4) Adjust the contrast value (C:0x81, D:0x00~0x3F, D: 0x00 ~ 0x07) until there is the best visual
(5) OTP setting steps = Contrast value of the best visual contrast - Contrast value of original
(6) Hardware Reset (sending an active low reset pulse to
(7) Enable Oscillator (C: 0xD1) and Exit Sleep Mode (C: 0x94)
(8) Connect an external V
(9) Send OTP setting commands that we find in step 1 (C: 0xF6, D: 0x10~0x1F, D: 0x0A~0x2A)
(10) Send OTP programming command (C: 0xF8)
(11) Wait at least 2 seconds
(12) Hardware Reset
(13) Verify the result by repeating step 1. (2) – (3)
OUT
contrast
initialization
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GND
+
-
C
(1) & (6) & (12)
(8)
OUT
(see diagram below)
Note: R = 1K ~ 2K ohm
R
C = 1u ~ 4.7u F
Jul 2004
RES pin)
RES pin)
GND
14.5-15.5V
P 48/69 Rev 1.0
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