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參數(shù)資料
| 型號： | OM6211F1 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 48 X 84 dot matrix LCD driver |
| 中文描述： | 48 × 84點陣LCD驅動器 |
| 文件頁數(shù)： | 10/48頁 |
| 文件大?。?/td> | 243K |
| 代理商： | OM6211F1 |
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2002 Jan 17
10
Philips Semiconductors
Product specification
48
×
84 dot matrix LCD driver
OM6211
9.9
Bias system
The bias voltage levels are set in the ratio of
R - R - nR - R - R. Different multiplex rates require
different factors of n. This is programmed by BS
2
to BS
0
.
For optimum bias values, n can be calculated from the
following equation:
; where Mux rate is 48.
Changing the bias system from the optimum setting will
have a consequence on the contrast and viewing angle.
One reason to depart from the optimum would be to
reduce the required V
LCD
voltage. A compromise between
contrast and V
LCD
must be found for any particular
application.
In the OM6211 one of three possible values of the bias
system can be selected. The value
1
7
is default.
n
Mux rate
3
–
=
Table 1
Programming the required bias system
Table 2
LCD bias voltages for
1
6
bias,
1
7
bias and
1
8
bias.
9.10
Voltage multiplier control
The OM6211 incorporates a software configurable voltage multiplier. After reset (RES) the voltage multiplier is set to
4V
DD2
. Other voltage multiplier factors are set via the serial interface (S
1
and S
0
).
Table 3
HV generator multiplication
BS
2
BS
1
BS
0
n
BIAS MODE
TYPICAL MUX
RATES
0
1
1
1
0
0
1
0
1
4
3
2
1
8
1
7
1
6
1 : 55 and 1 : 48
1 : 33
1 : 24
SYMBOL
BIAS VOLTAGE
FOR
1
6
BIAS
V
LCD
5
6
V
LCD
4
6
V
LCD
2
6
V
LCD
1
6
V
LCD
V
SS
FOR
1
7
BIAS
V
LCD
6
7
V
LCD
5
7
V
LCD
2
7
V
LCD
1
7
V
LCD
V
SS
FOR
1
8
BIAS
V
LCD
7
8
V
LCD
6
8
V
LCD
2
8
V
LCD
1
8
V
LCD
V
SS
V1
V2
V3
V4
V5
V6
S
1
0
0
1
1
S
0
0
1
0
1
MULTIPLICATION
2V
DD2
3V
DD2
4V
DD2
not available
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