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參數(shù)資料
| 型號： | PCF8820U |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | 67 x 101 Grey-scale/ECB colour dot matrix LCD driver |
| 中文描述： | LIQUID CRYSTAL DISPLAY DRIVER, UUC235 |
| 封裝： | BUMP, DIE-235 |
| 文件頁數(shù)： | 25/60頁 |
| 文件大?。?/td> | 316K |
| 代理商： | PCF8820U |
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2000 Dec 07
25
Philips Semiconductors
Product specification
67
×
101 Grey-scale/ECB colour dot matrix
LCD driver
PCF8820
Table 5
Programming the required bias system
Table 6
Examples of LCD bias voltages
BS2
BS1
BS0
BS
1
/
2
0
0
0
0
0
0
0
0
1
n
BIAS SYSTEM
COMMENT
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
X
7
6
5
4
3
2
1
0
2
1
/
11
1
/
10
1
/
9
1
/
8
1
/
7
1
/
6
1
/
5
1
/
4
1
/
2
recommended at multiplex rate 1 : 67
recommended at multiplex rate 1 : 8
allows a lower V
LCDIN
at multiplex rate 1 : 8
BIAS VOLTAGE
LEVEL ON PAD
CALCULATING BIAS
VOLTAGE
BIAS SYSTEM
1
/
9
(n = 5)
V
LCDIN
1
/
4
(n = 0)
V
LCDIN
1
/
2
(n =
2)
V
LCDIN
V
LCDOUT
V
LCDIN
3
4
V
2
8
/
9
×
V
LCDIN
3
/
4
×
V
LCDIN
1
/
2
×
V
LCDIN
V
3
7
/
9
×
V
LCDIN
1
/
2
×
V
LCDIN
V
SS1
V
4
2
/
9
×
V
LCDIN
1
/
2
×
V
LCDIN
V
LCDIN
V
5
1
/
9
×
V
LCDIN
1
/
4
×
V
LCDIN
1
/
2
×
V
LCDIN
V
SS1
V
SS1
V
SS1
V
SS1
V
SS1
n
+
+
n
V
LCDIN
×
n
2
4
+
+
n
V
LCDIN
×
+
n
4
-----2
V
LCDIN
×
+
n
4
-----1
V
LCDIN
×
8.1.5
H
IGH VOLTAGE GENERATOR CONFIGURATION
The PCF8820 incorporates a software configurable
voltage multiplier which uses a charge pump circuit
supplied by V
DD2
and V
DD3
. After a reset the voltage
multiplier factor is set to 2 (V
LCDOUT
= 2
×
V
DD2
). Other
voltage multiplier factors are set by bits S
2
to S
0
.
To reduce high current peaks at voltage multiplier start-up,
itisrecommendedthatthevoltagemultiplierisswitchedon
using the following procedure:
1.
Set bit DM = 1 and bit PD = 1
2.
Set multiplication factor to 2 by setting bits S
2
to S
0
to
logic 0
3.
Set register value V
OP
to the desired value,
bit PRS = 1 and bit HVE = 1
4.
Set bit PD = 0, which switches on the charge pump
(at multiplication factor 2)
5.
Increment the multiplication factor to the desired value
for V
LCDOUT
using bits S
2
to S
0
.
8.1.6
T
EMPERATURE READ
-
OUT
The PCF8820 has a built-in temperature sensor. At the
end of a temperature measurement, the sensor writes a
temperature value to the status register. The temperature
value is an 8-bit number represented by bits TR
7
to TR
0
in
the status register which can be read via the I
2
C-bus.
To save power, the sensor need only be enabled when a
measurement is required. A measurement is initialized by
setting bit SM = 1 which will be automatically cleared after
5 clock cycles (from internal oscillator or external clock).
The internal oscillator will be initialized and allowed to
warm-up for approximately 2 frame periods, after which a
measurement will be initiated at the start of the next frame
and completing after 2 frames.
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