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参数资料
| 型号： | PCF8576T/1,118 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 8/44页 |
| 文件大小： | 0K |
| 描述： | IC LCD DRV UNVRSL LOW-MUX 56VSOP |
| 产品培训模块： | LCD Driver |
| 标准包装： | 1 |
| 显示器类型： | LCD |
| 配置： | 8 段，15 段，160 元件 |
| 接口： | I²C，2 线串口 |
| 数字或字符： | 10 字符，20 字符，160 元件 |
| 电流 - 电源： | 180µA |
| 电源电压： | 2 V ~ 9 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 56-BSOP（0.435"，11.50mm 宽） |
| 供应商设备封装： | 56-VSOP |
| 包装： | 标准包装 |
| 其它名称： | 568-8087-6 |
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Philips Semiconductors
Universal LCD driver for low multiplex rates
Product speci?cation
PCF8576
6.1
Power-on reset
6.3
LCD voltage selector
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 4).
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.
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 1.
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 ( 3 = 1.732 for 1 : 3 multiplex or
21
---------- = 1.528 for 1 : 4 multiplex).
3
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 = 6 × V off ? rms ? = 2.449 V off(rms)
? 1 : 4 multiplex ( 1 ? 2 bias):
( 4 × 3 )
V op =
----------------------
3
= 2.309 V off(rms)
These compare with V op = 3 V off(rms) when 1 ? 3 bias is used.
Table 1
Preferred LCD drive modes: summary of characteristics
LCD DRIVE MODE
NUMBER OF
BACKPLANES LEVELS
LCD BIAS
CONFIGURATION
V off(rms)
---------------------
V op
V on(rms)
---------------------
V op
V on(rms)
D = ---------------------
V off(rms)
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
0.354
0.333
0.333
0.333
1
0.791
0.745
0.638
0.577
∞
2.236
2.236
1.915
1.732
2001 Oct 02
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCF8576T112 | 制造商:NXP Semiconductors 功能描述:LCD DRIVER 40 SEGMENT SMD 8576 |
| PCF8576TD | 功能描述:LCD 驱动器 LCD DVR UNVRSL LOW-MUX RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| PCF8576TD-T | 功能描述:LCD 驱动器 160 SEGMENT LCD SEGMENT DRIVER RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| PCF8576U | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
| PCF8576U/10 | 制造商:PHILIPS 制造商全称:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
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