參數(shù)資料
型號(hào)： PCF8578
廠(chǎng)商： NXP Semiconductors N.V.
英文描述： LCD row/column driver for dot matrix graphic displays
中文描述： 液晶行/列驅(qū)動(dòng)點(diǎn)陣圖形顯示
文件頁(yè)數(shù)： 9/44頁(yè)
文件大?。?/td> 323K
代理商： PCF8578
1998 Sep 08
9
Philips Semiconductors
Product specification
LCD row/column driver for dot matrix
graphic displays
PCF8578
7.3
Multiplexed LCD bias generation
The bias levels required to produce maximum contrast
depend on the multiplex rate and the LCD threshold
voltage (V
th
). V
th
is typically defined as the RMS voltage at
which the LCD exhibits 10% contrast. Table 2 shows the
optimum voltage bias levels for the PCF8578 as functions
of V
op
(V
op
= V
DD
V
LCD
), together with the discrimination
ratios (D) for the different multiplex rates. A practical value
for V
op
is obtained by equating V
off(rms)
with V
th
. Figure 4
shows the first 4 rows of Table 2 as graphs. Table 3 shows
the relative values of the resistors required in the
configuration of Fig.5 to produce the standard multiplex
rates.
Table 2
Optimum LCD voltages
Table 3
Multiplex rates and resistor values for Fig.5
PARAMETER
MULTIPLEX RATE
1 : 8
1 : 16
1 : 24
1 : 32
0.739
0.800
0.830
0.850
0.522
0.600
0.661
0.700
0.478
0.400
0.339
0.300
0.261
0.200
0.170
0.150
0.297
0.245
0.214
0.193
0.430
0.316
0.263
0.230
1.447
1.291
1.230
1.196
3.370
4.080
4.680
5.190
RESISTORS
MULTIPLEX RATE (n)
n = 8
n = 16, 24, 32
R1
R2
R3
R
–
R
R
–
V
2
V
op
--------
V
3
V
op
--------
V
4
V
op
--------
V
5
V
op
--------
V
op
)
-------V
V
V
op
)
----------------------
D
V
V
off rms
)
)
-----------------------
=
V
V
th
--------
n
–
2
n
(
(
)
R
)
R
3
n
3
(
)
R
7.4
Power-on reset
At power-on the PCF8578 resets to a defined starting
condition as follows:
1.
Display blank
2.
1 : 32 multiplex rate, row mode
3.
Start bank, 0 selected
4.
Data pointer is set to X, Y address 0, 0
5.
Character mode
6.
Subaddress counter is set to 0
7.
I
2
C-bus interface is initialized.
Data transfers on the I
2
C-bus should be avoided for 1 ms
following power-on, to allow completion of the reset action.
Fig.4
V
bias
/V
op
as a function of the multiplex rate.
1:8
1:16
1:32
1.0
0
0.8
MSA838
1:24
multiplex rate
0.6
0.4
0.2
Vbias
Vop
V5
V4
V3
V2
V
bias
= V
2
, V
3
, V
4
, V
5
. See Table 2.
相關(guān)PDF資料
PDF描述
PCF8578H LCD row/column driver for dot matrix graphic displays
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8578_03 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:LCD row/column driver for dot matrix graphic displays
PCF8578H 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:LCD row/column driver for dot matrix graphic displays
PCF8578H/1 功能描述:LCD 驅(qū)動(dòng)器 LCD DRVR DOT MATRIX RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
PCF8578H/1,118 功能描述:LCD 驅(qū)動(dòng)器 DOT MATRIX LCD DRIV (R/COLM) RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
PCF8578H/1,157 功能描述:LCD 驅(qū)動(dòng)器 LCD DRVR DOT MATRIX RoHS:否 制造商:Maxim Integrated 數(shù)位數(shù)量:4.5 片段數(shù)量:30 最大時(shí)鐘頻率:19 KHz 工作電源電壓:3 V to 3.6 V 最大工作溫度:+ 85 C 最小工作溫度:- 20 C 封裝 / 箱體:PDIP-40 封裝:Tube
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