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參數(shù)資料
| 型號(hào)： | HD66720 |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function |
| 中文描述： | 低功耗點(diǎn)陣液晶顯示控制器/鍵掃描功能驅(qū)動(dòng)程序 |
| 文件頁數(shù)： | 66/97頁 |
| 文件大小： | 513K |
| 代理商： | HD66720 |
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HD66727
66
Contrast Adjuster
Multiplexing Drive System
Contrast for an LCD controlled by the multiplexing drive method can be adjusted by varying the liquid-
crystal drive voltage (potential difference between V
CC
and V5) through the CT bits of the contrast control
instruction (electron volume function). See Figure 38 and Table 30. The value of a variable resistor (VR)
can be adjusted within the range from 0.4 x R through 6.4 x R, where R is a reference resistance obtained
by dividing the total resistance between V
CC
and V5.
The HD66727 incorporates a voltage-follower operational amplifier for each of V1 to V5 to reduce current
flowing through the internal bleeder-resistors, which generate different levels of liquid-crystal drive
voltages. Thus, potential differences between V
CC
and V1 and between V
EE
and V5 must be 0.4V or greater.
Note that the OPOFF pin must be grounded when using the operational amplifiers.
1/6 bias (V2 and V3 pins left open):
LCD drive voltage VLCD: 6R
×
(V
CC
– V
EE
)/(6R + VR) (VR = a value within the range from 0.4R to
6.4R)
VLCD adjustable range: 0.484
×
(V
CC
– V
EE
)
≤
VLCD
≤
0.938
×
(V
CC
– V
EE
)
Potential difference between V
CC
and V1: R
×
(V
CC
– V
EE
)/(6R + VR)
≥
0.4 (V)
Potential difference between V5 and V
EE
: VR
×
(V
CC
– V
EE
)/(6R + VR)
≥
0.4 (V)
1/4 bias (V2 and V3 pins short-circuited):
LCD drive voltage VLCD: 4R
×
(V
CC
– V
EE
)/(4R + VR) (VR = a value within the range from 0.4R to
6.4R)
VLCD adjustable range: 0.385
×
(V
CC
– V
EE
)
≤
VLCD
≤
0.909
×
(V
CC
– V
EE
)
Potential difference between V
CC
and V1: R
×
(V
CC
– V
EE
)/(4R + VR)
≥
0.4 (V)
Potential difference between V5 and V
EE
: VR
×
(V
CC
– V
EE
)/(4R + VR)
≥
0.4 (V)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| HD66720A01TF | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
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| HD66724RA03TA0L | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD CONTROLLER |
| HD66725 | 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:112 x 80-dot Graphics LCD Controller/Driver |
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