參數(shù)資料
型號： HCD44780UA00
廠商： Hitachi,Ltd.
英文描述： 320 x 240 pixel format, CFL backlight available with power harness
中文描述： 點陣式液晶顯示控制器/驅(qū)動器
文件頁數(shù)： 37/59頁
文件大?。?/td> 316K
代理商： HCD44780UA00
HD44780U
37
Power Supply for Liquid Crystal Display Drive
Various voltage levels must be applied to pins V1 to V5 of the HD44780U to obtain the liquid crystal
display drive waveforms. The voltages must be changed according to the duty factor (Table 10).
VLCD is the peak value for the liquid crystal display drive waveforms, and resistance dividing provides
voltages V1 to V5 (Figure 21).
Table 10
Duty Factor and Power Supply for Liquid Crystal Display Drive
Duty Factor
1/8, 1/11
1/16
Bias
Power Supply
1/4
1/5
V1
V
CC
–1/4 VLCD
V
CC
–1/2 VLCD
V
CC
–1/2 VLCD
V
CC
–3/4 VLCD
V
CC
–VLCD
V
CC
–1/5 VLCD
V
CC
–2/5 VLCD
V
CC
–3/5 VLCD
V
CC
–4/5 VLCD
V
CC
–VLCD
V2
V3
V4
V5
V
CC
V1
V2
V4
V5
V3
V
CC
V1
V2
V3
V4
V5
R
R
R
R
VR
–5 V
V
CC
(+5 V)
–5 V
V
CC
(+5 V)
R
R
R
R
R
VR
VLCD
VLCD
1/4 bias
(1/8, 1/11 duty cycle)
1/5 bias
(1/16, duty cycle)
Figure 21 Drive Voltage Supply Example
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