參數(shù)資料
型號(hào)： PCF8562
廠商： NXP Semiconductors N.V.
英文描述： Universal LCD driver for low multiplex rates
中文描述： 通用LCD驅(qū)動(dòng)器的低復(fù)用率
文件頁(yè)數(shù)： 8/36頁(yè)
文件大?。?/td> 928K
代理商： PCF8562
November 22, 2004
8
Philips Semiconductors
Preliminary specification
Universal LCD driver
for low multiplex rates
PCF8562
6.1
Power-on reset
At power-on the PCF8562 resets to the following starting conditions:
All backplane outputs are set to V
LCD
All segment outputs are set to V
LCD
Drive mode ‘1 : 4 multiplex with
1
3
bias’ is selected
Blinking is switched off
Input and output bank selectors are reset (as defined in Table 4)
The I
2
C-bus interface is initialized
The data pointer and the subaddress counter are cleared
Display is disabled.
Data transfers on the I
2
C-bus should be avoided for 1 ms following power-on to allow completion of the reset action.
6.2
LCD bias generator
Fractional LCD biasing voltages are obtained from an internal voltage divider comprising three resistors connected in
series between V
LCD
and V
SS
. The middle resistor can be bypassed to provide a
1
2
bias voltage level for the 1 : 2
multiplex configuration. The LCD voltage can be temperature compensated externally via the supply to pin V
LCD
.
6.3
LCD voltage selector
The LCD voltage selector co-ordinates the multiplexing of the LCD in accordance with the selected LCD drive
configuration. The operation of the voltage selector is controlled by MODE SET commands from the command decoder.
The biasing configurations that apply to the preferred modes of operation, together with the biasing characteristics as
functions of V
LCD
and the resulting Discrimination ratios (D), are given in Table 2.
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.
6.3.1
LCD
BIAS
FORMULAE
Bias is calculated by the formula
where for
1
2
bias, a = 1; for
1
3
bias, a = 2.
The LCD on voltage (V
on
) is calculated by the formula
The LCD off voltage (V
off
) is calculated by the formula
where V
op
is the resultant voltage at the LCD segment; N is the LCD drive mode: 1 = static, 2 = 1 : 2, 3 = 1 : 3, 4 = 1 : 4.
+
1
a
---1
1
N
---------------------------N
---
N
1
–
(
)
a
1
2
+
V
op
2
N
2a
1
N
)
2
+
a
(
(
)
–
+
a
V
op
相關(guān)PDF資料
PDF描述
PCF8832 STN RGB - 384 output column driver
PCF8890 240 + 1 outputs TFT LCD gate driver
PCF93C110 32-Bit Microcontroller
PCB93C110 32-Bit Microcontroller
PCG3N60C3W TRANSISTOR | IGBT | N-CHAN | 600V V(BR)CES | CHIP
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PCF8562_09 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates
PCF8562_11 制造商:PHILIPS 制造商全稱(chēng):NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates
PCF8562DTT/2,518 制造商:NXP Semiconductors 功能描述:Tape & Reel
PCF8562TT/2 制造商:NXP Semiconductors 功能描述:
PCF8562TT/2,118 功能描述:LCD 驅(qū)動(dòng)器 LCD DRIVER 32/128SEG 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
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*