參數(shù)資料
型號(hào)： PCF8576U
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, UUC56
封裝： DIE
文件頁(yè)數(shù)： 8/40頁(yè)
文件大?。?/td> 243K
代理商： PCF8576U
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
=
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