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參數(shù)資料
| 型號： | HD667B66R |
| 廠商： | Hitachi,Ltd. |
| 英文描述： | 132 x 176-dot Graphics LCD Controller/Driver for 65K Colors |
| 中文描述： | 132 × 176點(diǎn)圖形LCD控制器/驅(qū)動器的65K色 |
| 文件頁數(shù)： | 73/97頁 |
| 文件大小： | 681K |
| 代理商： | HD667B66R |
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HD66766R Rev. 1.0-1 / September 2002
73
Notes: 1. Generate an output voltage (VOUT) from step-up circuit 1 within the range from 4.0 to 5.75V.
2.
Do not allow the output voltage (VCH) from step-up circuit 2 to exceed 22 V.
3.
Do not allow the output from Vci2 to exceed VOUT voltage .
4.
When capacitor with polarity is used, be sure that an inverted voltage is not applied to it in
any state of the system.
5.
Vci1 is used as both the reference voltage input and power supply in the step-up circuit.
Keep sufficient LCD drive current.
6.
Rated voltage of capacitors possible to be used are as described below. Required voltage
depends on used panels. When actual voltage is less than 16V, capacitors with 16V rated
voltage can be used.
6.3V: VREFM, VciOUT, C11, C12, VOUT, BIASC, Vci2, C21, C22, C23, VSH, VM
25V(16V): VCH, CE, VCL
LCD Drive Voltage
The required voltage can be calculated by applying the following expressions. Drive voltages are
standard; generate a voltage to suit the panel to be used.
1
2
LCD Drive Bias
An optimal bias can be calculated by applying the following expression. The value that has been
calculated is theoretically optimal. If a lower bias value than the optimal value is used to drive the LCD,
contrast may be reduced depending on lighting conditions. However, the power consumption can be
reduced by lowering the drive voltage. Adjust the value according to the system to be used.
How to determine the VCH voltage
VCH = N
B
x N
D2
x VSH
N
B
: Bias ratio
N
D2
: Step-up factor of the step-up circuit 2
Contrast adjustment
R
B
: Contrast resistance (0.000R to 1.016R)
VSH = VREFM x 2R / (Rb + 2R)
Table 40
Bias value =
1
N
VSH-VM, VM-VSL
N
- 1
2
N
- 1
2N N
2
N
VCH-VM, VM-VCL
1
Vth: Threshold voltage of the LCD panel to be used.
N: Display duty cycle.
x Vth
x Vth
0.992R
1
1
0
0
0
0
0
1.000R
0
1
0
0
0
0
0
0.008R
0
1
1
1
1
1
1
Rb resist value
0.984R
1.008R
0.000R
1.016R
1
1
1
1
1
1
1
0
0
1
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
CT setting value
CT0
CT1
CT2
CT3
CT4
CT5
CT6
Rb Resist for adjusting contrast
(0.000R
VSH
1.016R)
VM
VSL
VREFM
R
Rb
R
VCH=VM
VCH
step-up
circuit 2
VCI2
VCI2=VM
N
B
N
B
N
2
Figrue 56
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