- 您現在的位置：買賣IC網 > PDF目錄382382 > PCF8576C (NXP Semiconductors N.V.) Universal LCD driver for low multiplex rates PDF資料下載
參數資料
| 型號： | PCF8576C |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Universal LCD driver for low multiplex rates |
| 中文描述： | 通用LCD驅動器的低復用率 |
| 文件頁數： | 8/40頁 |
| 文件大小： | 243K |
| 代理商： | PCF8576C |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁當前第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁
1998 Feb 06
8
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex
rates
PCF8576
6.1
Power-on reset
At power-on the PCF8576 resets to a starting condition as
follows:
1.
All backplane outputs are set to V
DD
.
2.
All segment outputs are set to V
DD
.
3.
The drive mode ‘1 : 4 multiplex with
1
3
bias’ is selected.
4.
Blinking is switched off.
5.
Input and output bank selectors are reset (as defined
in Table 5).
6.
The I
2
C-bus interface is initialized.
7.
The data pointer and the subaddress counter are
cleared.
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
The full-scale LCD voltage (V
op
) is obtained from
V
DD
V
LCD
. The LCD voltage may be temperature
compensated externally through the V
LCD
supply to pin 12.
Fractional LCD biasing voltages are obtained from an
internal voltage divider of the three series resistors
connected between V
DD
and V
LCD
. The centre resistor can
be switched out of the circuit to provide a
1
2
bias voltage
level for the 1 : 2 multiplex configuration.
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
op
= V
DD
V
LCD
and the
resulting discrimination ratios (D), are given in Table 2.
A practical value for V
op
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
op
> 3V
th
approximately.
Multiplex drive ratios of 1 : 3 and 1 : 4 with
1
2
bias are
possible but the discrimination and hence the contrast
ratios are smaller (
= 1.732 for 1 : 3 multiplex or
= 1.528 for 1 : 4 multiplex).
The advantage of these modes is a reduction of the LCD
full-scale voltage V
op
as follows:
1 : 3 multiplex (
1
2
bias):
×
V
op
=
= 2.449 V
off(rms)
1 : 4 multiplex (
1
2
bias):
V
op
=
= 2.309 V
off(rms)
These compare with V
op
= 3 V
off(rms)
when
1
3
bias is used.
3
3
----21
6
V
off rms
3
×
)
3
--4
Table 2
Preferred LCD drive modes: summary of characteristics
LCD DRIVE MODE
NUMBER OF
LCD BIAS
CONFIGURATION
BACKPLANES
LEVELS
static
1 : 2
1 : 2
1 : 3
1 : 4
1
2
2
3
4
2
3
4
4
4
static
1
2
1
3
1
3
1
3
0
1
∞
0.354
0.333
0.333
0.333
0.791
0.745
0.638
0.577
2.236
2.236
1.915
1.732
V
op
----V
V
op
----V
D
V
off(rms)
V
=
相關PDF資料 |
PDF描述 |
|---|---|
| PCF8576CH | Universal LCD driver for low multiplex rates |
| PCF8576U | Universal LCD driver for low multiplex rates |
| PCF8577C | LCD direct/duplex driver with I2C-bus interface |
| PCF8577CP | LCD direct/duplex driver with I2C-bus interface |
| PCF8591 | 8-bit A/D and D/A converter |
相關代理商/技術參數 |
參數描述 |
|---|---|
| PCF8576C_10 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
| PCF8576CH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
| PCF8576CH/1 | 功能描述:LCD 驅動器 160 SEGMENT LCD SEGMENT DRIVER RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率: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 |
| PCF8576CH/1,118 | 功能描述:LCD 驅動器 160 SEGMENT LCD SEGMENT DRIVER RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率: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 |
| PCF8576CH/1,157 | 功能描述:LCD 驅動器 160 SEGMENT LCD RoHS:否 制造商:Maxim Integrated 數位數量:4.5 片段數量:30 最大時鐘頻率: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 |
發布緊急采購，3分鐘左右您將得到回復。