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參數(shù)資料
| 型號： | PCF8820 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 67 x 101 Grey-scale/ECB colour dot matrix LCD driver |
| 中文描述： | 67 × 101 Grey-scale/ECB彩色點陣LCD驅(qū)動器 |
| 文件頁數(shù)： | 7/60頁 |
| 文件大?。?/td> | 316K |
| 代理商： | PCF8820 |
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2000 Dec 07
7
Philips Semiconductors
Product specification
67
×
101 Grey-scale/ECB colour dot matrix
LCD driver
PCF8820
6.2.12
S
LAVE ADDRESS INPUTS
These inputs (SA0 and SA1) allow up to four PCF8820
drivers to be controlled on the same I
2
C-bus. Inputs SA0
and SA1 represent respectively bit 0 and bit 1 of the slave
address.
6.2.13
O
SCILLATOR SIGNAL INPUT
Pad OSC must be connected directly to V
DD1
when the
on-chip oscillator is used. No external components are
required. It should be noted that any voltage drop of V
DD1
may affect the performance of the on-chip oscillator.
An external clock must be connected to input OSC.
6.2.14
E
XTERNAL RESET INPUT
A LOW-level on input RES initializes the chip.
6.2.15
T
EST PADS
The test pads (T1, T2, T3, T4, T5 and T6) must not be
accessible to the user.
Pads T1, T3 and T4 must be connected to V
SS1
, pad T5
must be connected to V
DD1
, and pads T2 and T6 must be
left open-circuit.
7
FUNCTIONAL DESCRIPTION
7.1
Oscillator
Theon-chiposcillatorprovidestheclocksignalfortheLCD
system. The clock mode is controlled via the I
2
C-bus
interface. A clock signal must always be present, except in
the Power-down mode, to prevent the LCD entering a
DC state.
7.2
I
2
C-bus interface controller
The I
2
C-bus interface controller receives and executes the
commands sent via the I
2
C-bus. The PCF8820 acts as an
I
2
C-bus slave receiver/transmitter and therefore it cannot
control the bus communication.
7.3
Input filters
RC low-pass filters are provided on inputs SDA_IN, SCL
and RES to enhance noise immunity in electrically
adverse environments.
7.4
Display Data RAM (DDRAM)
The PCF8820 contains a 67
×
101
×
2-bit static RAM,
which stores the display data. The RAM comprises
17 banks of 101 bytes (17
×
101
×
8 bits). Not all of the
last bank is implemented. During RAM access, data is
transferred to the RAM via the I
2
C-bus interface controller.
7.5
Timing generator
The timing generator produces the various signals
required to drive the internal circuitry. Internal chip
operation is not affected by operations on the I
2
C-bus.
7.6
Address counter
The address counter generates write addresses to the
DDRAM. During a write operation, display data is stored at
the addressed locations.
7.7
Display address counter
The display address counter generates read addresses to
the DDRAM. During a read operation, display data is read
out to the LCD.
7.8
Command decoder
The command decoder receives command words which
are followed by data byte(s) from the I
2
C-bus. The
command decoder identifies the command words and
determines the destination for the data byte(s).
7.9
Column driver outputs
The LCD driver section has 101 outputs (C0 to C100)
which should be connected directly to the column drive
inputs of the LCD. The column driver signals are
generated in accordance with the multiplexed row signals
and with the data in the display data latch.
The programmed grey-scale levels are built-up in the LCD
over four frames (N1
1
, N1
2
, N1
3
and N1
4
) as shown in
Figs 3, 4 and 5.
7.10
Row driver outputs
The LCD driver section has 67 outputs (R0 to R66) which
should be connected directly to the row drive inputs of the
LCD. The row driver signals are generated in accordance
with the selected LCD drive mode.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| PCF8820U | 67 x 101 Grey-scale/ECB colour dot matrix LCD driver |
| PCF8831 | STN RGB - 160 output row driver |
| PCF8831U | STN RGB - 160 output row driver |
| PCF8833 | STN RGB - 132 X 132 X 3 driver |
| PCF88331 | STN RGB - 132 X 132 X 3 driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PCF8820U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:67 x 101 Grey-scale/ECB colour dot matrix LCD driver |
| PCF8831 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STN RGB - 160 output row driver |
| PCF8831U | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STN RGB - 160 output row driver |
| PCF8832 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:STN RGB - 384 output column driver |
| PCF8833 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STN RGB - 132 X 132 X 3 driver |
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