UPD16647 Просмотр технического описания (PDF) - NEC => Renesas Technology
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UPD16647 Datasheet PDF : 16 Pages
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µ PD16647
4. RELATION BETWEEN INPUT DATA AND OUTPUT VOLTAGE VALUE
The 10 major points on the γ -characteristic curve of the LCD panel are arbitrarily set by external power supplies V0
through V9. If the display data is 00H or 3FH, gray scale voltage V0 or V9 is output. If the display data is in the range
01H to 3EH, the high-order 3 bits select an external power pair Vn+1, Vn. The low-order 3 bits evenly divide the range
of Vn+1 to Vn into eight segments by means of D/A conversion (however, the ranges from V8 to V7 and from V1 to V0
are divided into seven segments) to output a 64 gray scale voltage.
DX5(MSB)
DX4
DX3
DX2
DX1
DX0 (LSB)
High-order 3 bits
: γ-corrected power selected
(Vn, Vn+1)
Low-order 3 bits
: 3-bit D/A (range Vn to Vn+1 is divided to 7 or 8 segments)
DX5
DX4
DX3
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Vn+1-Vn
V1-V2
V2-V3
V3-V4
V4-V5
V5-V6
V6-V7
V7-V8
V8-V9
Vn
1
2
3
4
5
6
7
8
Vn+1
000 001 010 011 100 101 110 111
VDD2 V0
Figure4-1. Relationship between Input Data and γ-corrected Voltage
gray scale supply specified
by 00H
7 segments
V1
8 segments
V2
8 segments
V3
8 segments
V4
8 segments
V5
8 segments
V6
8 segments
V7
7 segments
V8
VSS2 V9
gray scale supply specified
0
7
F
17
1F
27
2F
37
3F
by 3FH
Input data (HEX)
Data Sheet S13607EJ2V0DS00
5
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