SSD1298 Crystalfontz America, Inc.,, SSD1298 Datasheet - Page 48

• Manufacturer Part Number: SSD1298
• Description: 240 Rgb X 320 Tft Lcd Controller Driver Integrated Power Circuit, Gate And Source Driver With Built-in Ram
• Manufacturer: Crystalfontz America, Inc.,

Vcom OTP (R28h – R29h)
When OTP is access, these registers must be set accordantly.
OTP programming sequence
Reg# R/W
R28h
R29h
Solomon Systech
W
W
Note: nOTP must set to “0” to activate the OTP effect.
Precaution:
Step
DC
1
1
1
2
3
4
5
6
7
8
9
1. All capacitors on OTP machine should be discharged completely before placing the LCD module.
2. The OTP programming voltage should not be applied when placing and removing the LCD module.
3. The OTP programming voltage should not be applied before VDDIO/VCI.
4. After OTP is finished, the capacitors at VGH and VCIX2 must be discharged completely before
IB15 IB14 IB13 IB12 IB11 IB10
0
1
removing the LCD module.
Power up the module at VCI = 2.7V, VDDIO = 1.8V.
Turn on the display as normal to 65k/262k color mode (displaying a test
pattern if any).
Set nOTP to “1” (R1Eh) and optimizes VcomH by adjusting VCM[5:0]
(R1Eh).
Power down the whole module.
Connect a supply to the module at VCI = 2.7V, VDDIO = 1.8V
Write below commands for OTP initialization and wait for 200ms for
activate the OTP :
Connect a 14.5V supply to VGH through a current limiting resistor, see
figure below.
Write the optimized value found in Step 2 to VCM[5:0] (R1Eh) and set
nOTP to “1”.
Fire the OTP by write HEX code “000Ah” to register R28h.
Wait 500ms.
OTP complete. Power down the whole module and remove 14.5V
supply.
0
0
0
0
0
0
0
0
Index
R00h
R28h
R29h
0
0
Operation
IB9
0
0
IB8
0
0
0x80C0
0x0001
0x0006
Value
IB7
0
1
IB6
Mar 2008 P 48/82
0
1
IB5
0
0
IB4
0
0
IB3
Rev 1.1
0
0
IB2
1
0
IB1
1
0
SSD1298
IB0
0
0