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| 型號(hào)： | PCF85176T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顯示驅(qū)動(dòng)器 |
| 英文描述： | Universal LCD driver for low multiplex rates |
| 中文描述： | LIQUID CRYSTAL DISPLAY DRIVER, PDSO56 |
| 封裝： | 6.10 MM, PLASTIC, MO-153, SOT364-1, TSSOP-56 |
| 文件頁(yè)數(shù)： | 8/47頁(yè) |
| 文件大?。?/td> | 405K |
| 代理商： | PCF85176T |
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PCF85176
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2 — 27 June 2011
8 of 47
NXP Semiconductors
PCF85176
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.
LCD drive
mode
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
a
+
Bias is calculated by
, where the values for a are
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
:
(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
:
(2)
Discrimination is the ratio of V
on(RMS)
to V
off(RMS)
and is determined from
Equation 3
:
(3)
Biasing characteristics
Number of:
Backplanes
LCD bias
configuration
Levels
static
1:2 multiplex
1:2 multiplex
1:3 multiplex
1:4 multiplex
1
2
2
3
4
2
3
4
4
4
static
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
1
2
1
3
1
3
1
3
V
V
LCD
------------------------
V
V
LCD
-----------------------
D
V
V
off
RMS
------------------------
=
---1
V
on RMS
n
1
n
2
a
+
-----------------------------
V
LCD
=
V
off RMS
n
1
2
a
+
-----------------------------
V
LCD
=
D
V
V
off RMS
----------------------
2
a
2a
n
n
–
+
---------------------------
=
=
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| PCF85176T/1,118 | 功能描述:LCD 驅(qū)動(dòng)器 40 SGMT 2640Hz 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 |
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