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UPD7225 데이터시트(PDF) 21 Page - Renesas Technology Corp

부품명 UPD7225
상세설명  MOS INTEGRATED CIRCUIT
PDF  50 Pages
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제조업체  RENESAS [Renesas Technology Corp]
홈페이지  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

UPD7225 데이터시트(HTML) 21 Page - Renesas Technology Corp

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Data Sheet S14308EJ6V1DS
19
µµµµPD7225
4.
LCD DRIVE POWER SUPPLY PIN VOLTAGE SETTING
The bias method for setting the LCD drive power supply pin allows a different voltage to be supplied to each pin.
Figure 4-1. Voltage Setting
VLC1
VLC2
VLC3
Static
VDD
VDD
− VLCD
VDD
− VLCD
1/2 bias
VDD
−
VLCD
VDD
−
VLCD
VDD
− VLCD
1/3 bias
VDD
−
VLCD
VDD
−
VLCD
VDD
− VLCD
Remark
VLCD : LCD voltage
The following shows a circuit example which supplies voltages between VDD and VSS as the LCD drive reference
voltage.
(1) Static
VLCD
R1 =
× R2
VDD
− VLCD
• VLCD: LCD drive voltage
• R2 is used for contrast adjustment.
(2) Divide-by-2, -3 time division (1/2 bias)
VLCD
R1 =
× R2
2(VDD
− VLCD)
1
2
1
3
1
2
1
3
VDD
VDD
VLC1
VLC2
VLC3
R1
R2
VSS
GND
PD7225
µ
VDD
VDD
VLC1
VLC2
VLC3
R1
R1
R2
VSS
GND
PD7225
µ



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