參數(shù)資料
型號(hào)： PCF8820U
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 顯示驅(qū)動(dòng)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(yè)數(shù)： 27/60頁(yè)
文件大?。?/td> 316K
代理商： PCF8820U
2000 Dec 07
27
Philips Semiconductors
Product specification
67
×
101 Grey-scale/ECB colour dot matrix
LCD driver
PCF8820
handbook, full pagewidth
MGT128
00
01
02
a
VLCD
(V)
03
04
05
06
. . .
7D
7E
7F
00
01
02
03
04
05
06
. . .
7D
7E
7F
register
value
b
LOW
(1)
HIGH
(2)
Fig.20 Generated V
LCDOUT
set by programming V
LCD
control register value (bits V
OP6
to V
OP0
).
(1) Bit PRS = 0: V
LCD
programming range is LOW.
(2) Bit PRS = 1: V
LCD
programming range is HIGH.
The programming range for the generated V
LCDOUT
allows
values above the maximum value of V
LCD
. Therefore, the
user must ensure that the V
LCD
control register value and
the temperature coefficient selected, will never allow the
maximum V
LCD
limit to be exceeded for all conditions and
including all tolerances. The customer must also ensure
that the V
LCD
control register value will never be lower than
V
DD1
or V
DD2
, except in the Power-down mode, for all
conditions and including all tolerances.
8.1.8
G
REY
-
SCALE REGISTER AND GREY
-
SCALE LEVEL
The PCF8820 has 4 grey-scale registers selected by bits
GR
0
and GR
1
, which define the four grey intensity levels.
Eachofthe4 registerscontain6 bitsallowing toselectone
out of the 64 grey levels. A grey-scale register must be
addressed before it can be written to by using the
instruction ‘Grey-scale register’ (see Table 2). The content
of the grey-scale register (bits GS
5
to GS
0
) is set by the
instruction ‘Grey-scale level control’ (see Table 2). It
should be noted that a grey-scale register setting of 63 is
internally converted to 64. Even numbers are preferred;
odd numbers produce a small DC component in the
waveform of the respective column (see Fig.3).
Thegrey-scalelevelforeachpixeliseffectedbywritingthe
resultant grey-scale register value into the DDRAM (see
Fig.6).
One of the grey-scale registers can be used to create a
blinking cursor. The intensity of the pixels comprising the
cursor are to be defined by the value in the grey-scale
register. The brightness/colour of the cursor pixels can be
changed by selecting a different grey-scale register
containing a different grey-scale value.
A blinking cursor can be effected by continuously
switching the content of one grey-scale register between
the two grey-scales from e.g. white to black and back
again with a frequency of 2 Hz giving the impression of a
blinking cursor. This procedure causes less load for the
microcontroller than changing all pixels which form the
desired cursor. This implies the display has 3 grey-scale
levels left e.g. off, grey and on.
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PCF8831 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STN RGB - 160 output row driver
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