参数资料
| 型号： | PCA8576CH/Q900,157 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 9/54页 |
| 文件大小： | 0K |
| 描述： | IC LCD DRIVER UNIV 64LQFP |
| 产品培训模块： | I²C Bus Fundamentals |
| 标准包装： | 800 |
| 显示器类型： | LCD |
| 配置： | 40 段 |
| 接口： | I²C |
| 电流 - 电源： | 120µA |
| 电源电压： | 2 V ~ 6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 64-LQFP |
| 供应商设备封装： | 64-LQFP（10x10） |
| 包装： | 托盘 |
| 其它名称： | 568-5218 |
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NXP Semiconductors
PCA8576C
Automotive LCD driver for low multiplex rates
The RMS off-state voltage (V off(RMS) ) for the LCD is calculated with Equation 2 :
a 2 – 2a + n
n ? ? 1 + a ?
V off ? RMS ? =
V LCD
------------------------------
2
(2)
Discrimination is the ratio of V on(RMS) to V off(RMS) and is determined from Equation 3 :
----------------------- ?
? a + 1 ? + ? n – 1 ?
? a – 1 ? + ? n – 1 ?
V on ? RMS
D = =
V off ? RMS ?
2
--------------------------------------------
2
(3)
Using Equation 3 , the discrimination for an LCD drive mode of 1:3 multiplex with
1 ?
2
bias is
3 = 1.732 and the discrimination for an LCD drive mode of 1:4 multiplex with
bias is ---------- = 1.528 .
1 ?
2
21
3
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): V LCD =
6 ? V off ? RMS ? = 2.449V off ? RMS ?
? 1:4 multiplex ( 1 ? 2 bias): V LCD = = 2.309V off ? RMS ?
? 4 ? 3 ?
----------------------
3
These compare with V LCD = 3V off ? RMS ? when 1 ? 3 bias is used.
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
V on ? RMS ? ? V th ? on ?
V off ? RMS ? ? V th ? off ?
(4)
(5)
V on(RMS) and V off(RMS) are properties of the display driver and are affected by the selection
of a (see Equation 1 ), n (see 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. V th(off) is sometimes named V th . V th(on) is sometimes named saturation
voltage V sat .
It is important to match the module properties to those of the driver in order to achieve
optimum performance.
PCA8576C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 2 — 16 December 2013
? NXP B.V. 2013. All rights reserved.
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相关代理商/技术参数 |
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|---|---|
| PCA8576D | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Automotive 40 x 4 LCD segment driver for low multiplex rates up to 1:4 |
| PCA8576DU | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Automotive 40 x 4 LCD segment driver for low multiplex rates up to 1:4 |
| PCA8576DU/2DA/Q2,0 | 功能描述:IC LCD DRIVER AUTO 40X4 UNCASED RoHS:是 类别:未定义的类别 >> 其它 系列:* 标准包装:1 系列:* 其它名称:MS305720A |
| PCA8576Q2 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Automotive 40 x 4 LCD segment driver for low multiplex rates up to 1:4 |
| PCA8581 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:128 x 8-bit EEPROM with I2C-bus interface |
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