参数资料
| 型号： | PCF8562TT/S400/2,1 |
| 厂商： | NXP Semiconductors |
| 文件页数： | 8/43页 |
| 文件大小： | 0K |
| 描述： | IC LCD DRIVER 48-TSSOP |
| 标准包装： | 2,000 |
| 显示器类型： | LCD |
| 配置： | 7段 + DP，14段 + DP + AP，点阵 |
| 接口： | I²C，2 线串口 |
| 数字或字符： | 8 个字符，16 个字符 |
| 电流 - 电源： | 8µA |
| 电源电压： | 1.8 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-TFSOP（0.240"，6.10mm 宽） |
| 供应商设备封装： | 48-TSSOP |
| 包装： | 带卷 (TR) |
| 其它名称： | PCF8562TTS40021 |
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NXP Semiconductors
PCF8562
Universal LCD driver for low multiplex rates
Discrimination is a term which is defined as the ratio of the on and off RMS voltage across
a segment. It can be thought of as a measurement of contrast.
Table 5.
Biasing characteristics
V off ? RMS ?
V on ? RMS ?
D = ------------------------- ?
LCD drive
mode
Number of: LCD bias
Backplanes Levels configuration
-------------------------
V LCD
------------------------
V LCD
V on ? RMS
V off ? RMS ?
static
1
2
static
0
1
?
1:2 multiplex 2
1:2 multiplex 2
1:3 multiplex 3
1:4 multiplex 4
3
4
4
4
1 ? 2
1 ? 3
1 ? 3
1 ? 3
0.354
0.333
0.333
0.333
0.791
0.745
0.638
0.577
2.236
2.236
1.915
1.732
Bias is calculated by ------------- , where the values for a are
A practical value for V LCD is determined by equating V off(RMS) with a defined LCD
threshold voltage (V th(off) ), typically when the LCD exhibits approximately 10 % contrast. In
the static drive mode a suitable choice is V LCD > 3V th(off) .
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.
1
1 + a
a = 1 for 1 ? 2 bias
a = 2 for 1 ? 3 bias
The RMS on-state voltage (V on(RMS) ) for the LCD is calculated with Equation 1 :
a 2 + 2a + n
n ? ? 1 + a ?
V on ? RMS ? =
V LCD
------------------------------
2
(1)
where the values for n are
n = 1 for static drive mode
n = 2 for 1:2 multiplex drive mode
n = 3 for 1:3 multiplex drive mode
n = 4 for 1:4 multiplex drive mode
The RMS off-state voltage (V off(RMS) ) for the LCD is calculated with Equation 2 :
a 2 – 2a + n
n ? ? 1 + a ?
V off ? RMS ? =
V LCD
------------------------------
2
(2)
Discrimination is the ratio of V on(RMS) to V off(RMS) and is determined from Equation 3 :
D = ----------------------- ? =
a + 2a + n
a – 2a + n
V on ? RMS
V off ? RMS ?
2
---------------------------
2
(3)
PCF8562
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 6 — 16 June 2011
? NXP B.V. 2011. All rights reserved.
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