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參數(shù)資料
| 型號(hào)： | PCF8820 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 67 x 101 Grey-scale/ECB colour dot matrix LCD driver |
| 中文描述： | 67 × 101 Grey-scale/ECB彩色點(diǎn)陣LCD驅(qū)動(dòng)器 |
| 文件頁數(shù)： | 45/60頁 |
| 文件大?。?/td> | 316K |
| 代理商： | PCF8820 |
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2000 Dec 07
45
Philips Semiconductors
Product specification
67
×
101 Grey-scale/ECB colour dot matrix
LCD driver
PCF8820
13.3
High voltage generator
The high voltage generator contains a voltage multiplier
which uses a charge pump circuit supplied by V
DD2
and
V
DD3
. The multiplier is software programmable with a
factor from 2 to 8. In the direct drive mode the output
voltage V
LCDOUT
= V
DD2
.
When the charge pump is used the total supply current of
the PCF8820 at a supply voltage of 3, 4 and 5 V is shown
in Figs 27, 28 and 29.
The separate graphs are shown for each voltage multiplier
factor with the following conditions:
At T
amb
V
DD1
, V
DD2
and V
DD3
connected to the same power
supply
Supply line resistors of 50
(typical value)
Internal clock not calibrated
No LCD connected to the PCF8820
All pixels defined at grey-scale level 32; this is the worst
case
Bias system
1
9
Full screen mode (bit PS = 0) at a multiplex rate of 1 : 67
Normal display mode.
The characteristics shown for each voltage multiplier
factor are terminated before V
LCDOUT
has been reached
the maximum value to indicate that the voltage cannot be
increased any further. If a higher voltage is required, a
higher voltage multiplier factor must be selected.
Connecting a LCD may increase the current into
pad V
LCDIN
which may affect the current taken by the
chargepumpandalsoits efficiency.Theamountof current
load may depend on the type of LCD used.
It is advisable to evaluate the PCF8820 connected to the
desired LCD and set to the required mode(s) to produce
characteristics similar to Figs 27, 28 and 29. The
customer can then use these graphs to select the most
efficient and safe voltage multiplier factor for each mode
required.
handbook, full pagewidth
(mA)
16
programmed VLCDOUT (V)
0
4
5
6
7
8
12
9
13
10
14
11
15
MGT132
0.8
0.4
1.0
0.6
0.2
x 8
x 7
x 2
x 3
x 4
x 5
x 6
Fig.27 Charge pump characteristics for V
DD
= 3 V.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCF8820U | 67 x 101 Grey-scale/ECB colour dot matrix LCD driver |
| PCF8831 | STN RGB - 160 output row driver |
| PCF8831U | STN RGB - 160 output row driver |
| PCF8833 | STN RGB - 132 X 132 X 3 driver |
| PCF88331 | STN RGB - 132 X 132 X 3 driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCF8820U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:67 x 101 Grey-scale/ECB colour dot matrix LCD driver |
| PCF8831 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STN RGB - 160 output row driver |
| PCF8831U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STN RGB - 160 output row driver |
| PCF8832 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:STN RGB - 384 output column driver |
| PCF8833 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STN RGB - 132 X 132 X 3 driver |
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