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參數資料
| 型號： | PCF8531 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 34×128 pixel matrix driver(34×128 像素矩陣驅動器) |
| 中文描述： | 34 × 128像素矩陣驅動器（34 × 128像素矩陣驅動器） |
| 文件頁數： | 14/44頁 |
| 文件大?。?/td> | 212K |
| 代理商： | PCF8531 |
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2000 Feb 11
14
Philips Semiconductors
Product specification
34
×
128 pixel matrix driver
PCF8531
8.18.8
LCD
BIAS VOLTAGE
Table 3
Intermediate LCD bias voltages
8.18.9
S
ET
V
OP
VALUE
:
The operating voltage V
LCD
can be set by software.
The voltage at reference temperature [V
LCD
(T = T
cut
)] can
be calculated as: V
LCD
(T
cut
) = (a + V
OP
×
b).
The generated voltage is dependent on the temperature,
programmed Temperature Coefficient (TC) and the
programmed voltage at reference temperature (T
cut
).
V
LCD
= V
LCD
(T
cut
)
×
[1 + TC
×
(T
T
cut
)].
The parameter values are given in Table 4.
Two overlapping V
LCD
ranges can be selected via the
command ‘HV-gen control’ (see Table 4 and Fig.8).
The maximum voltage that can be generated depends on
the V
DD2
and V
DD3
voltages and the display load current.
For Mux 1 : 34, the optimum operating voltage of the liquid
can be calculated as:
Where V
th
is the threshold voltage of the liquid crystal
material used.
The practical value for V
OP
is determined by equating
V
off(rms)
with a defined LCD threshold voltage (V
th
),
typically when the LCD exhibits approximately
10% contrast.
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
OP
register and
selecting the temperature compensation, that the V
LCD
limit of maximum 9 V will never be exceeded under all
conditions and including all tolerances.
SYMBOL
BIAS
VOLTAGES
EXAMPLE FOR
1
7
BIAS
V1
V
LCD
V
LCD
V2
6
7
×
V
LCD
V3
5
7
×
V
LCD
V4
2
7
×
V
LCD
V5
1
7
×
V
LCD
V6
V
SS
V
SS
n
3
4
+
+
n
V
LCD
×
n
2
4
+
+
n
V
LCD
×
+
n
4
-----2
V
LCD
×
+
n
4
-----1
V
LCD
×
V
LCD
34
+
2
1
34
--1
–
×
--------1
V
th
×
5.30
V
th
×
=
=
Table 4
Parameter values for the HV generator programming
SYMBOL
VALUE
UNIT
PRS = 0
PRS = 1
T
cut
a
b
Programming range
27
2.94
0.03
27
6.75
0.03
°
C
V
V
V
2.94 to 6.75
6.75 to 10.56
相關PDF資料 |
PDF描述 |
|---|---|
| PCF8533 | Universal LCD driver for low multiplex rates |
| PCF8535 | 65 x 133 pixel matrix driver |
| PCF8535U | 65 x 133 pixel matrix driver |
| PCF8548 | 65 x 102 pixels matrix LCD driver |
| PCF8549 | 65 x 102 pixels matrix LCD driver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PCF8531_1008 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:34 x 128 pixel matrix driver |
| PCF8531_11 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:34 x 128 pixel matrix driver Single-chip LCD controller and driver |
| PCF8531U | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver |
| PCF8531U/2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:34 x 128 pixel matrix driver |
| PCF8531U/2/F1 | 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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