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參數(shù)資料
| 型號： | PCF8533 |
| 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)動器的低復(fù)用率 |
| 文件頁數(shù)： | 7/36頁 |
| 文件大小： | 158K |
| 代理商： | PCF8533 |
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1999 Jul 30
7
Philips Semiconductors
Product specification
Universal LCD driver for low multiplex rates
PCF8533
6.1
Power-on reset
At Power-on the PCF8533 resets to a starting condition as
follows:
1.
All backplane outputs are set to V
LCD
.
2.
All segment outputs are set to V
LCD
.
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.
8.
Display 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 of the three series resistors
connected between V
LCD
and V
SS
. 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
and the resulting
discrimination ratios (D), are given in Table 2.
ApracticalvalueforV
OP
isdeterminedbyequatingV
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
.
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):
×
2.449V
off(rms)
=
=
1 : 4 multiplex (
1
2
bias):
-4
=
These compare with V
OP
= 3V
off(rms)
when
1
3
bias is used.
Note: V
OP
= V
LCD
.
3
--3
V
OP
6
V
off(rms)
V
OP
3
×
)
3
2.309V
off(rms)
=
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
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
V
OP
---V
V
OP
---V
D
V
off(rms)
V
=
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相關(guān)代理商/技術(shù)參數(shù) |
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| PCF8533U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal LCD driver for low multiplex rates |
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| PCF8533U/2/F2026 | 制造商:Rochester Electronics LLC 功能描述: 制造商:NXP 功能描述: 制造商:NXP Semiconductors 功能描述: |
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