參數(shù)資料
型號(hào)： PCF8566
廠商： NXP Semiconductors N.V.
英文描述： Universal LCD driver for low multiplex rates
中文描述： 通用LCD驅(qū)動(dòng)器的低復(fù)用率
文件頁數(shù)： 7/40頁
文件大?。?/td> 243K
代理商： PCF8566
1998 May 04
7
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex
rates
PCF8566
6.1
Power-on reset
At power-on the PCF8566 resets to a defined starting
condition as follows:
1.
All backplane outputs are set to V
DD
2.
All segment outputs are set to V
DD
3.
The drive mode ‘1 : 4 multiplex with
1
3
bias’ is selected
4.
Blinking is switched off
5.
Input and output bank selectors are reset (as defined
in Table 5)
6.
The I
2
C-bus interface is initialized
7.
The data pointer and the subaddress counter are
cleared.
Data transfers on the I
2
C-bus should be avoided for 1 ms
following power-on to allow completion of the reset action.
6.2
LCD bias generator
The full-scale LCD voltage (V
op
) is obtained from
V
DD
V
LCD
. The LCD voltage may be temperature
compensated externally through the V
LCD
supply to pin 12.
Fractional LCD biasing voltages are obtained from an
internal voltage divider of three series resistors connected
between V
DD
and V
LCD
. The centre resistor can be
switched out of circuit to provide a
1
2
bias voltage level for
the 1 : 2 multiplex configuration.
6.3
LCD voltage selector
The LCD voltage selector coordinates the multiplexing of
the LCD according to the selected LCD drive
configuration. The operation of the voltage selector is
controlled by MODE SET commands from the command
decoder. The biasing configurations that apply to the
preferred modes of operation, together with the biasing
characteristics as functions of V
op
= V
DD
V
LCD
and the
resulting discrimination ratios (D), are given in Table 2.
A practical value of V
op
is determined by equating V
off(rms)
with a defined LCD threshold voltage (V
th
), typically when
the LCD exhibits approximately 10% contrast. In the static
drive mode a suitable choice is V
op
≥
3 V
th
. Multiplex drive
ratios of 1 : 3 and 1 : 4 with
1
2
bias are possible but the
discrimination and hence the contrast ratios are smaller
(
1 : 4 multiplex). The advantage of these modes is a
reduction of the LCD full scale voltage V
op
as follows:
for 1 : 3 multiplex or
for
1 : 3 multiplex (
1
2
bias):
1 : 4 multiplex (
1
2
bias):
These compare with V
op
= 3 V
off(rms)
when
1
3
bias is used.
3
1.732
=
21 3
1.528
=
V
op
6V
op(mrs)
2.449V
off rms
)
=
=
V
op
3
4
3
V
off rms
)
2.309V
off rms
)
=
=
Table 2
Preferred LCD drive modes: summary of characteristics
LCD DRIVE MODE
LCD BIAS
CONFIGURATION
Static (1 BP)
1 : 2 MUX (2 BP)
static (2 levels)
1
2
(3 levels)
0
1
=
∞
1 : 2 MUX (2 BP)
1
3
(4 levels)
1
3
= 0.333
1 : 3 MUX (3 BP)
1
3
(4 levels)
1
3
= 0.333
1 : 4 MUX (4 BP)
1
3
(4 levels)
1
3
= 0.333
V
op
)
------V
V
V
op
)
----------------------
D
V
V
off rms
)
)
-----------------------
=
2 4
0.354
=
10 4
0.791
5
2.236
=
5 3
0.745
=
5
2.236
=
33 9
0.638
=
33 3
1.915
=
3 3
0.577
=
3
1.732
=
相關(guān)PDF資料
PDF描述
PCF8573 Clock/calendar with Power Fail Detector
PCF8573P Clock/calendar with Power Fail Detector
PCF8573T Clock/calendar with Power Fail Detector
PCF8574 Remote 8-bit I/O expander for I2C-bus
PCF8578 LCD row/column driver for dot matrix graphic displays
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8566P 制造商:NXP Semiconductors 功能描述:LCD DRIVER LOW-MUX 40DIP 制造商:NXP Semiconductors 功能描述:LCD DRIVER, LOW-MUX, 40DIP
PCF8566P,112 功能描述:LCD 驅(qū)動(dòng)器 LCD DVR UNVRSL LOW-MUX 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
PCF8566P-1 制造商:PHILIPS-SEMI 功能描述:
PCF8566PN 制造商:未知廠家 制造商全稱:未知廠家 功能描述:LCD Display Driver
PCF8566T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。

采購需求

(若只采購一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購

我的聯(lián)系方式

*
*
*