SSD1805TR1 ETC2 [List of Unclassifed Manufacturers], SSD1805TR1 Datasheet - Page 33

• Manufacturer Part Number: SSD1805TR1
• Description: 132 x 68 STN LCD Segment / Common Monochrome Driver with Controller
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

OTP Example program
Find the OTP offset:
Hardware reset by sending an active low reset pulse to
0X2F \\ turn on the internal voltage booster & output op-amp buffer.
0XA2
0XA9
0X62
0X81
0X20
0X24
\\ Set target display contents
0x00
0X10
0XB0
0xAF
OTP offset calculation… target OTP offset value is +6
OTP programming:
Hardware reset by sending an active low reset pulse to
Connect a external V
0X82
0X06
0X83
Wait at least 2 seconds for programming wait time.
Verify the result:
After OTP programming, procedure 2 to 5 are repeated for inspection of the contrast on the panel.
9.24 Set Multiplex Ratio
This command switches default multiplex ratio to any multiplex mode from 2 to the maximum multiplex ratio
(POR value), including the icon line.
Max. MUX ratio: 68 for 68 MUX mode
The chip pins ROW0 - ROW67 will be switched to corresponding COM signal output, see Table 12 on Page
35 for examples with and without 8 lines display offset for different MUX. It should be noted that after
changing the display multiplex ratio, the bias ratio need to be adjusted to make display contrast consistent.
9.25 Set Bias Ratio
Except the 1/4 bias, all other available bias ratios could be selected using this command plus the “Set LCD
Bias” command. For detail setting values and POR default, please refer to the extended command table,
Table 9 on Page 26.
9.26 Set Temperature Coefficient (TC) Value
One out of 4 different temperature coefficient settings is selected by this command in order to match various
liquid crystal temperature grades. Please refer to the extended command table, Table 9 on Page 26, for
detailed TC values.
9.27 Modify Oscillator Frequency
The oscillator frequency can be fine tuned by applying this command. Since the oscillator frequency will be
affected by some other factors, this command is not recommended for general usage. Please contact
Solomon Systech application engineers for more detail explanation on this command.
SSD1805 Series
\\ Set Biasing ratio
\\ 1/9 for 68/64 MUX mode
\\Set target gain and contrast.
\\ contrast = 20 Hex.
\\ IR4 =>
\\ set start column address at 0000 binary for lower nibble
\\ set start column address at 0000 binary for upper nibble
\\ set page address at page 0
\\ display on
\\ Set OTP offset value to +6 (0110)
\\ 0000 X
\\ Send the OTP programming command.
65 for 64 MUX mode including icon line
55 for 54 MUX mode including icon line
33 for 32 MUX mode including icon line
3
Rev 1.1
X
2
X
OUT
1
X
0
(14.5V~15.5V)
, where X
P 33/52
3
X
Jun 2004
2
X
1
X
0
is the OTP offset value
RES
RES
pin
pin
Solomon Systech