SSD1881T1R1 Ver la hoja de datos (PDF) - Solomon Systech
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SSD1881T1R1 Datasheet PDF : 34 Pages
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10. FUNCTIONAL BLOCK DESCRIPTIONS
Controller and Data Register
Based on the input signal of FR, F1, F2 and LP, this Controller will generate signals to control the Data Register.
Then, the Data Register will latch the data to the Common Cell Level Shifter according to the signals from the
Controller and the data from the Shift Register. The data is latched to the Common Cell Level Shifter at the falling
edge of LP.
Bi-directional Shift Register
This Shift Register will shift the input signals YD and CIO input according to the setting of SHL, SEL, LSEL and
CSEL. When SHL is set at “L” level, CIO1 is input and CIO2 is output. When SHL is set at “H” level, CIO1 is
output and CIO2 is input. The output transition occurs on the falling edge of LP.
Common Cell Level Shifter
This is a level interface circuit which is used to convert the signal voltage level from a logic system level to the LCD
driver system voltage level. When DOFF# is at “L” level, all common output voltage will be at VC level. When
DOFF# is at “H” level, the common output voltage will be changed according to the status of input signals of FR,
F1 and F2.
Table 7 shows the relationship among the common output voltage and the input signals FR, F1 and F2. Table 8
shows the relationship between line number and Common.
When DOFF# = H and FR = L
F1
1
0
1
0
F2
1
1
0
0
line r
+V1
+V1
-V1
+V1
line (r + 1)
-V1
+V1
+V1
+V1
line (r + 2)
+V1
-V1
+V1
+V1
line (r + 3)
+V1
+V1
+V1
-V1
When DOFF# = H and FR = H
F1
1
0
1
0
F2
1
1
0
0
line r
-V1
-V1
+V1
-V1
line (r + 1)
+V1
-V1
-V1
-V1
line (r + 2)
-V1
+V1
-V1
-V1
line (r + 3)
-V1
-V1
-V1
+V1
Table 7 – Relationship among COM voltage, F1, F2 and FR
Line number
r
r+1
r+2
r+3
Formula
Multiples of 4
1 + multiples of 4
2 + multiples of 4
3 + multiples of 4
Table 8 - Relationship between line number and Common.
Common
0, 4, 8, 12, ... , 148, 152, 156
1, 5, 9, 13, ... , 149, 153, 157
2, 6, 10, 14, ... , 150, 154, 158
3, 7, 11, 15, ... , 151, 155, 159
SOLOMON
Rev 2.1
09/2002
SSD1881
14
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