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UPD16680 bảng dữ liệu(PDF) 13 Page - NEC

tên linh kiện UPD16680
Giải thích chi tiết về linh kiện  1/53, 1/40 DUTY, LCD CONTROLLER/DRIVER WITH BUILT-IN RAM
PDF  44 Pages
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nhà sản xuất  NEC [NEC]
Trang chủ  http://www.nec.com/
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UPD16680 bảng dữ liệu(HTML) 13 Page - NEC

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Data Sheet S12694EJ2V0DS00
13
µµµµPD16680
5.3 REFERENCE VOLTAGE CIRCUIT
5.3.1 To use internal reference voltage circuit ( VEXT = L )
When internal driving circuit is chosen, 6 levels for LCD reference voltage (VLC1, VLC2, VLC3, VLC4, VLC5, VSS) is
generate by internal breeder resister.
5.3.2 To use external driving circuit ( VEXT = H )
When external driving circuit is chosen, operational amplifier incorporated IC is Off. It is necessary to input voltage
to VLC1, VLC2, VLC3, VLC4 and VLC5 directly.
Generally, These levels are made by external breeder resister. The display dignity of LCD declines when these
resistance values are big, it is necessary to choose the resistance value which corresponds with the LCD panel.
There is an effect that improves display dignity when connecting a capacitor with each level pins and the ground. It is
necessary to choose the condenser value which corresponds with the LCD panel.
Figure 5-3. Reference voltage circuit
VLC1
R
to SEG, COM Outputs
VLC2
R
to COM Output
VLC3
R
to SEG Output
R
R
VLCBS3
VLCBS2
VLC4
R
to SEG Output
VLC5
−
R
to COM Output
AMPOUT
to SEG, COM Output
VLCBS1
VSS
Voltage follower for level voltage
+
−
+
−
+
−
+
−
+
5



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