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参数资料
| 型号： | 933740730112 |
| 厂商： | NXP SEMICONDUCTORS |
| 元件分类： | 显示驱动器 |
| 英文描述： | LIQUID CRYSTAL DISPLAY DRIVER, PDSO56 |
| 封装： | PLASTIC, VSOP-56 |
| 文件页数： | 43/44页 |
| 文件大小： | 192K |
| 代理商： | 933740730112 |
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2001 Oct 02
8
Philips Semiconductors
Product specication
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 VDD.
2. All segment outputs are set to VDD.
3. The drive mode ‘1 : 4 multiplex with 1
3bias’ is selected.
4. Blinking is switched off.
5. Input and output bank selectors are reset (as defined
in Table 4).
6. The I2C-bus interface is initialized.
7. The data pointer and the subaddress counter are
cleared.
Data transfers on the I2C-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 (Vop) is obtained from
VDD VLCD. The LCD voltage may be temperature
compensated externally through the VLCD supply to pin 12.
Fractional LCD biasing voltages are obtained from an
internal voltage divider of the three series resistors
connected between VDD and VLCD. The centre resistor can
be switched out of the circuit to provide a 1
2bias 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 Vop =VDD VLCD and the
resulting discrimination ratios (D), are given in Table 1.
A practical value for Vop is determined by equating Voff(rms)
with a defined LCD threshold voltage (Vth), typically when
the LCD exhibits approximately 10% contrast. In the static
drive mode a suitable choice is Vop >3Vth approximately.
Multiplex drive ratios of 1 : 3 and 1 : 4 with 1
2bias 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 Vop as follows:
1 : 3 multiplex (12bias):
Vop =
= 2.449 Voff(rms)
1 : 4 multiplex (12bias):
Vop =
= 2.309 Voff(rms)
These compare with Vop =3Voff(rms) when 13bias is used.
3
21
3
----------
6V
off rms
×
43
×
()
3
----------------------
Table 1
Preferred LCD drive modes: summary of characteristics
LCD DRIVE MODE
NUMBER OF
LCD BIAS
CONFIGURATION
BACKPLANES
LEVELS
static
1
2
static
0
1
∞
1:2
2
3
1
2
0.354
0.791
2.236
1:2
2
4
1
3
0.333
0.745
2.236
1:3
3
4
1
3
0.333
0.638
1.915
1:4
4
1
3
0.333
0.577
1.732
V
off(rms)
V
op
---------------------
V
on(rms)
V
op
---------------------
D
V
on(rms)
V
off(rms)
---------------------
=
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