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參數(shù)資料
| 型號(hào)： | PCF8548 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 65 x 102 pixels matrix LCD driver |
| 中文描述： | 65 × 102像素矩陣LCD驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 20/40頁 |
| 文件大?。?/td> | 206K |
| 代理商： | PCF8548 |
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1999 Aug 16
20
Philips Semiconductors
Product specification
65
×
102 pixels matrix LCD driver
PCF8548
Table 4
Programming the required bias system
BS[2]
BS[1]
BS[0]
n
RECOMMENDED MUX RATE
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
7
6
5
4
3
2
1
0
1 : 100
1 : 81
1 : 64
1 : 49
1 : 36
1 : 24
1 : 16
1 : 9
Table 5
LCD bias voltage
12.10 Set V
OP
value
The voltage at reference temperature can be calculated
as: [V
LCD
(T = T
cut
)]
V
LCD
Tcut
(
)
(1)
The operating voltage V
LCD
can be set by software.
The generated voltage is dependent on the temperature,
programmed Temperature Coefficient (TC) and the
programmed voltage at reference temperature (T
cut
).
V
LCD
a
V
OP
b
×
+
(
)
1
+
[
×
=
(2)
SYMBOL
BIAS VOLTAGES
BIAS VOLTAGES
FOR
1
9
BIAS
V
LCD
8
9
×
V
LCD
7
9
×
V
LCD
2
9
×
V
LCD
1
9
×
V
LCD
V
SS
V1
V2
V3
V4
V5
V6
V
LCD
(n + 3)/(n + 4)
(n + 2)/(n + 4)
2/(n + 4)
1/(n + 4)
V
SS
a
V
OP
b
×
+
(
)
=
T
T
cut
–
(
)
TC
×
]
The parameters are explained in Fig.16 and Table 6.
The maximum voltage that can begenerated is dependent
on the V
DD2
voltage and the display load current.
Two overlapping V
LCD
ranges are selectable via the
command ‘HV-gen control’. For the LOW (PRS = 0) range
a = a
1
and for the HIGH (PRS = 1) range a = a
2
with steps
equal to b in both ranges. It should be noted that the
chargepumpisturnedoffifV
OP
[6;0]andbitPRSareallset
to zero. For Mux 1 : 65 the optimum operation voltage of
the liquid can be calculated as follows:
where V
th
is the threshold voltage of the liquid crystal
material used.
V
LCD
65
+
2
1
1
65
----------
–
×
--------1
V
th
6.85
V
th
×
=
×
=
Table 6
Typical values for parameters for the HV-generator programming
SYMBOL
BITS
VALUE
UNIT
a
1
a
2
b
T
cut
2.94 (PRS = 0)
6.75 (PRS = 1)
0.03
27
V
V
V
°
C
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相關(guān)代理商/技術(shù)參數(shù) |
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| PCF8548U/2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:65 x 102 pixels matrix LCD driver |
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| PCF8549U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:65 x 102 pixels matrix LCD driver |
| PCF8549U/2 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:65 x 102 pixels matrix LCD driver |
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