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參數資料
| 型號： | 935261851026 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 顯示驅動器 |
| 英文描述： | LIQUID CRYSTAL DISPLAY DRIVER, UUC56 |
| 封裝： | DIE-56 |
| 文件頁數： | 18/46頁 |
| 文件大小： | 246K |
| 代理商： | 935261851026 |
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1998 Jul 30
25
Philips Semiconductors
Product specication
Universal LCD driver for low multiplex
rates
PCF8576C
Table 10 Load data pointer option 1
Table 11 Device select option 1
Table 12 Bank select option 1
Table 13 Bank select option 2
DESCRIPTION
BITS
6 bit binary value of 0 to 39
P5 P4 P3 P2 P1 P0
DESCRIPTION
BITS
3 bit binary value of 0 to 7
A0
A1
A2
STATIC
1 : 2 MUX
BIT I
RAM bit 0
RAM bits 0 and 1
0
RAM bit 2
RAM bits 2 and 3
1
STATIC
1 : 2 MUX
BIT O
RAM bit 0
RAM bits 0 and 1
0
RAM bit 2
RAM bits 2 and 3
1
Table 14 Blink option 1
Table 15 Blink option 2
BLINK FREQUENCY
BITS
BF1
BF0
Off
0
2Hz
0
1
1Hz
1
0
0.5 Hz
1
BLINK MODE
BIT A
Normal blinking
0
Alternation blinking
1
7.9
Display controller
The display controller executes the commands identified
by the command decoder. It contains the status registers
of the PCF8576C and co-ordinates their effects.
The controller is also responsible for loading display data
into the display RAM as required by the filling order.
7.10
Cascaded operation
In large display configurations, up to 16 PCF8576Cs can
be distinguished on the same I2C-bus by using the 3-bit
hardware subaddress (A0, A1 and A2) and the
programmable I2C-bus slave address (SA0). When
cascaded PCF8576Cs are synchronized so that they can
share the backplane signals from one of the devices in the
cascade. Such an arrangement is cost-effective in large
LCD applications since the backplane outputs of only one
device need to be through-plated to the backplane
electrodes of the display. The other PCF8576Cs of the
cascade contribute additional segment outputs but their
backplane outputs are left open-circuit (Fig.18).
The SYNC line is provided to maintain the correct
synchronization between all cascaded PCF8576Cs. This
synchronization is guaranteed after the power-on reset.
The only time that SYNC is likely to be needed is if
synchronization is accidentally lost (e.g. by noise in
adverse electrical environments; or by the definition of a
multiplex mode when PCF8576Cs with differing SA0
levels are cascaded). SYNC is organized as an
input/output pin; the output selection being realized as an
open-drain driver with an internal pull-up resistor.
A PCF8576C asserts the SYNC line at the onset of its last
active backplane signal and monitors the SYNC line at all
other times. Should synchronization in the cascade be
lost, it will be restored by the first PCF8675C to assert
SYNC. The timing relationship between the backplane
waveforms and the SYNC signal for the various drive
modes of the PCF8576C are shown in Fig.19.
For single plane wiring of packaged PCF8576Cs and
chip-on-glass cascading, see Chapter “Application
information”.
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