参数资料
| 型号： | PCA8576CH/Q900,157 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 8/54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 |
第1页第2页第3页第4页第5页第6页第7页当前第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页第46页第47页第48页第49页第50页第51页第52页第53页第54页
NXP Semiconductors
PCA8576C
Automotive LCD driver for low multiplex rates
7.2 LCD bias generator
The full-scale LCD voltage (V oper ) is obtained from V DD ? V LCD . The LCD voltage may be
temperature compensated externally through the V LCD supply to pin V LCD .
Fractional LCD biasing voltages are obtained from an internal voltage divider comprising
three series resistors connected between V DD and V LCD . The center resistor can be
switched out of the circuit to provide a 1 ? 2 bias voltage level for the 1:2 multiplex
configuration.
7.3 LCD voltage selector
The LCD voltage selector coordinates the multiplexing of the LCD in accordance with the
selected LCD drive configuration. The operation of the voltage selector is controlled by the
mode-set command from the command decoder. The biasing configurations that apply to
the preferred modes of operation, together with the biasing characteristics as functions of
Table 6.
Biasing characteristics
V off ? RMS ?
V on ? RMS ?
D = ------------------------- ?
LCD drive
mode
Number of: LCD bias
Backplanes Levels configuration
-------------------------
V LCD
------------------------
V LCD
V on ? RMS
V off ? RMS ?
static
1
2
static
0
1
?
1:2 multiplex 2
1:2 multiplex 2
1:3 multiplex 3
1:4 multiplex 4
3
4
4
4
1 ? 2
1 ? 3
1 ? 3
1 ? 3
0.354
0.333
0.333
0.333
0.791
0.745
0.638
0.577
2.236
2.236
1.915
1.732
Bias is calculated by ------------- , where the values for a are
A practical value for V LCD 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 LCD > 3V th .
Multiplex drive modes of 1:3 and 1:4 with 1 ? 2 bias are possible but the discrimination and
hence the contrast ratios are smaller.
1
1 + a
a = 1 for 1 ? 2 bias
a = 2 for 1 ? 3 bias
The RMS on-state voltage (V on(RMS) ) for the LCD is calculated with Equation 1 :
a 2 + 2a + n
n ? ? 1 + a ?
V on ? RMS ? =
V LCD
------------------------------
2
(1)
where the values for n are
n = 1 for static drive mode
n = 2 for 1:2 multiplex drive mode
n = 3 for 1:3 multiplex drive mode
n = 4 for 1:4 multiplex drive mode
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.
8 of 54
相关PDF资料 |
PDF描述 |
|---|---|
| PCF1175CT/S420/2:1 | IC LCD CAR CLOCK 4DIGIT 28SOIC |
| PCF1178CT,112 | IC LCD CAR CLOCK 4DIGIT 28SOIC |
| PCF1179CT,118 | IC LCD CAR CLOCK 4DIGIT 28SOIC |
| PCF2112CP/F1,112 | IC LCD DRIVER 32SEG 40-DIP |
| PCF85132U/2DA/1,02 | IC LCD DISPLAY DRVR UNCASED |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
发布紧急采购，3分钟左右您将得到回复。