參數(shù)資料
型號(hào): PCF8535
廠商: NXP Semiconductors N.V.
英文描述: 65 x 133 pixel matrix driver
中文描述: 65 × 133像素矩陣驅(qū)動(dòng)程序
文件頁(yè)數(shù): 13/52頁(yè)
文件大?。?/td> 1765K
代理商: PCF8535
1999 Aug 24
13
Philips Semiconductors
Objective specification
65
×
133 pixel matrix driver
PCF8535
handbook, halfpage
MGS473
T
VLCD
0
°
C
Fig.4 V
LCD
as function of liquid crystal temperature (typical values).
Table 5
Selectable temperature coefficients
7.13
V
OP
7.13.1
S
ET
V
OP
VALUE
The voltage at the reference temperature can be
calculated as: [V
LCD
(T = T
cut
)]
V
LCD
Tcut
(
)
(4)
The operating voltage, V
OP
, can be set by software.
The generated voltage is dependent on the temperature,
programmed Temperature Coefficient (TC) and the
programmed voltage at the reference temperature (T
cut
):
V
LCD
a
V
OP
b
×
+
(
)
1
(
×
=
(5)
The values for T
cut
, a and b are given in Table 6.
The maximum voltage that can begenerated isdependent
on the voltage V
DD2
and the display load current.
Two overlapping V
OP
ranges are selectable via the
command page “Hv-gen control”, see Fig.5.
The low range offers programming from 4.5 to 10.215 V,
with the high range from 10.215 to 15.93 V at the cut point
temperature, T
cut
. Care must be taken, when using
temperature coefficients, that the programmed voltage
does not exceed the maximum allowed V
LCD
voltage,
see Chapter 10.
For a particular liquid, the optimum V
LCD
can be calculated
for a given multiplex rate. For a Mux rate of 1 : 65, the
optimum operating voltage of the liquid can be calculated
as:
(6)
where V
th
is the threshold voltage of the liquid crystal
material used.
Table 6
Values for parameters of the HV generator
programming
TC[2]
TC[1]
TC[0]
TC VALUE
UNIT
1/
°
C
1/
°
C
1/
°
C
1/
°
C
1/
°
C
1/
°
C
1/
°
C
1/
°
C
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
0.44
×
10
3
1.10
×
10
3
1.45
×
10
3
1.91
×
10
3
2.15
×
10
3
2.32
×
10
3
2.74
×
10
3
a
V
OP
b
×
+
(
)
=
T
T
cut
(
)
TC
×
(
)
+
)
SYMBOL
BITS
VALUE
UNIT
a
PRS = 0
PRS = 1
4.5
V
V
V
°
C
10.215
0.045
27
b
T
cut
V
LCD
65
+
2
1
65
----1
×
--------1
V
th
×
6.85
V
th
×
=
=
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