参数资料
型号: PCF8579H/1:118
厂商: NXP Semiconductors
文件页数: 8/41页
文件大小: 0K
描述: IC LCD COLUMN DRIVER 64-LQFP
标准包装: 1,500
显示器类型: LCD
配置: 点阵
接口: I²C
电流 - 电源: 9µA
电源电压: 2.5 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: 带卷 (TR)
其它名称: 935276303118
PCF8579H/1-T
PCF8579H/1-T-ND
NXP Semiconductors
PCF8579
LCD column driver for dot matrix graphic displays
Remark: Do not transfer data on the I 2 C-bus for at least 1 ms after power-on to allow the
reset action to complete.
8.2 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 de?ned as the RMS voltage at which the
LCD exhibits 10 % contrast. Table 4 shows the optimum voltage bias levels and Table 5
the discrimination ratios (D) for the different multiplex rates as functions of V oper .
V oper = V DD – V LCD
The RMS on-state voltage (V on(RMS) ) for the LCD is calculated with the equation
(1)
n ( n + 1 )
V on ( RMS ) =
V oper
1 n – 1
--- + ------------------------
n
(2)
and the RMS off-state voltage (V off(RMS) ) with the equation
------------------------------ 2 -
V off ( RMS ) =
V oper
2 ( n – 1 )
n ( n + 1 )
(3)
where the values for n are determined by the multiplex rate (1:n). Valid values for n are:
n = 8 for 1:8 multiplex
n = 16 for 1:16 multiplex
n = 24 for 1:24 multiplex
n = 32 for 1:32 multiplex
Table 4.
Optimum LCD voltages
Bias ratios
Multiplex rate
1:8
1:16
1:24
1:32
V 2
--------------
V oper
V 3
--------------
V oper
V 4
--------------
V oper
V 5
--------------
V oper
0.739
0.522
0.478
0.261
0.800
0.600
0.400
0.200
0.830
0.661
0.339
0.170
0.850
0.700
0.300
0.150
PCF8579_5
? NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 11 May 2009
8 of 41
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