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| 型號(hào)： | PCF85176T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類(lèi)： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Universal LCD driver for low multiplex rates |
| 中文描述： | LIQUID CRYSTAL DISPLAY DRIVER, PDSO56 |
| 封裝： | 6.10 MM, PLASTIC, MO-153, SOT364-1, TSSOP-56 |
| 文件頁(yè)數(shù)： | 9/47頁(yè) |
| 文件大?。?/td> | 405K |
| 代理商： | PCF85176T |
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PCF85176
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 27 June 2011
9 of 47
NXP Semiconductors
PCF85176
Universal LCD driver for low multiplex rates
Using
Equation 3
, the discrimination for an LCD drive mode of 1:3 multiplex with
1
2
bias is
and the discrimination for an LCD drive mode of 1:4 multiplex with
1
2
bias is
.
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage V
LCD
as follows:
1:3 multiplex (
1
2
bias):
1:4 multiplex (
1
2
bias):
These compare with
when
1
3
bias is used.
It should be noted that V
LCD
is sometimes referred as the LCD operating voltage.
7.3.1
Electro-optical performance
Suitable values for V
on(RMS)
and V
off(RMS)
are dependent on the LCD liquid used. The
RMS voltage, at which a pixel will be switched on or off, determine the transmissibility of
the pixel.
For any given liquid, there are two threshold values defined. One point is at 10 % relative
transmission (at V
th(off)
) and the other at 90 % relative transmission (at V
th(on)
), see
Figure 6
. For a good contrast performance, the following rules should be followed:
(4)
(5)
V
on(RMS)
and V
off(RMS)
are properties of the display driver and are affected by the selection
of a, n (see
Equation 1
to
Equation 3
) and the V
LCD
voltage.
V
th(off)
and V
th(on)
are properties of the LCD liquid and can be provided by the module
manufacturer.
It is important to match the module properties to those of the driver in order to achieve
optimum performance.
3
1.732
=
3
---21
1.528
=
V
LCD
6
V
off
RMS
2.449V
off
RMS
=
=
V
LCD
3
-4
3
2.309V
off
RMS
=
=
V
LCD
3V
off
RMS
=
V
on RMS
V
th on
V
off RMS
V
th off
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| PCF85176T/1,118 | 功能描述:LCD 驅(qū)動(dòng)器 40 SGMT 2640Hz 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 |
| PCF8522EP | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:I2C Serial EEPROM |
| PCF8522ET | 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:I2C Serial EEPROM |
| PCF8523 | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Real-Time Clock (RTC) and calendar |
| PCF8523T | 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Save power with small, ultra-efficient RTCs |
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