参数资料
型号: PCF8578H/1,118
厂商: NXP Semiconductors
文件页数: 10/46页
文件大小: 0K
描述: IC LCD DRVR ROW/CLMN 64-LQFP
标准包装: 1,500
显示器类型: LCD
配置: 点阵
接口: I²C
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: 935276284118
PCF8578H/1-T
PCF8578H/1-T-ND
NXP Semiconductors
PCF8578
LCD row/column driver for dot matrix graphic displays
Table 5 shows the relative values of the resistors required in the con?guration of Figure 5
to produce the standard multiplex rates.
Table 5.
Resistors
Multiplex rates and resistor values for Figure 5
Multiplex rate (1:n)
n=8
n = 16, 24, 32
R1
R2
R3
R
( n – 2 ) R
( 3 – n ) R
R
R
( n – 3 ) R
8.2 Power-on reset
At power-on the PCF8578 resets to a de?ned starting condition as follows:
1. Display blank
2. 1:32 multiplex rate, row mode
3. Start bank 0 selected
4. Data pointer is set to X, Y address 0, 0
5. Character mode
6. Subaddress counter is set to 0
7. I 2 C-bus interface is initialized
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.
8.3 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 6 shows the optimum voltage bias levels and Table 7
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 -
PCF8578_6
Product data sheet
V off ( RMS ) =
V oper
2 ( n – 1 )
n ( n + 1 )
Rev. 06 — 5 May 2009
(3)
? NXP B.V. 2009. All rights reserved.
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