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參數(shù)資料
| 型號： | OM62112 |
| 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(qū)動器 |
| 文件頁數(shù)： | 11/48頁 |
| 文件大?。?/td> | 243K |
| 代理商： | OM62112 |
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2002 Jan 17
11
Philips Semiconductors
Product specification
48
×
84 dot matrix LCD driver
OM6211
9.11
Temperature compensation
Due to the temperature dependency of the liquid crystals viscosity, the LCD controlling voltage (V
LCD
) must be increased
at lower temperatures to maintain optimum contrast. Figure 4 shows V
LCD
as a function of temperature for a typical high
multiplex rate liquid.
In the OM6211 the temperature coefficient of V
LCD
can be selected from 4 values by setting bits TC
1
and TC
0
,
see Tables 4 and 8.
handbook, full pagewidth
MGT848
T
VLCD
Fig.4 V
LCD
as a function of liquid crystal temperature (typical values).
9.12
V
LCD
generator
ThebinarynumberV
OP
representingtheoperatingvoltage
can be set by the serial interface command and can be
adjusted (calibrated) by 5 input pins according to the
following formula:
V
OP
V
PR
V
OS
+
=
(1)
where:
V
PR
is an 8-bit unsigned number set by the serial
interface command
V
OS
is a 5-bit two’s complement number set by the
5 input pins V
OS4
to V
OS0
, see Table 9
V
OP
is an 8-bit unsigned number used internally for
generation of the LCD supply voltage V
LCD
.
To avoid numerical overflow the allowed values of V
PR
should be limited to the range 32 to 225 (decimal).
The corresponding voltage at the reference temperature,
T
nom
, can be calculated as follows:
V
LCD(Tnom)
a
V
OP
b
×
+
(
)
=
(2)
The generated voltage at V
LCD
is dependent on the
temperature, programmed Temperature Coefficient (TC)
and the programmed voltage at the reference temperature
(T
nom
).
(3)
T
nom
, a and b for each temperature coefficient are given in
Table 4. The maximum voltage that can be generated is
dependent on the voltage of V
DD2
and the display load
current.
As the programming range for the internally generated
V
LCD
allows values above the maximum allowed V
LCD
, the
user has to ensure while setting the V
PR
register and
selecting the Temperature Compensation, that under all
conditions and including all tolerances the V
LCD
limit of
maximum 9 V will never be exceeded.
For a particular liquid crystal, the optimum value of V
LCD
can be calculated for a given multiplex rate. For a Mux rate
of 1 : 48, the optimum operating voltage of the liquid
crystal can be calculated as follows;
(4)
where V
th
is the threshold voltage of the liquid crystal used.
V
LCD
a
V
OP
+
b
×
(
)
1
TC
T
T
nom
–
(
)
×
+
[
]
×
=
V
LCD
48
+
2
1
48
--1
–
×
--------1
V
th
×
6.06
V
th
×
=
=
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