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參數(shù)資料
| 型號： | HCD66717A03 |
| 廠商： | Hitachi,Ltd. |
| 元件分類： | 晶體 |
| 英文描述： | (Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver) |
| 中文描述： | （低功耗點陣液晶顯示控制器/驅(qū)動器） |
| 文件頁數(shù)： | 57/90頁 |
| 文件大小： | 716K |
| 代理商： | HCD66717A03 |
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HD66717
509
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 35 and Table 20. The value of a variable resistor (VR)
can be adjusted within the range from 0.4R through 6.4R, where R is a reference resistance obtained by
dividing the total resistance between V
CC
and V5.
The HD66717 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) 3 0.4 (V)
Potential difference between V5 and V
EE
: VR
×
(V
CC
– V
EE
)/(4R + VR) 3 0.4 (V)
Static Drive System
Contrast for a statically-driven LCD, that is, annunciator display, can be adjusted through the AGND pin.
The annunciators are driven statically by the potential difference between V
CC
and AGND. The AGND
pin level must be equal to or greater than the GND level.
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