pca8576d NXP Semiconductors, pca8576d Datasheet - Page 5

• Manufacturer Part Number: pca8576d
• Description: Automotive 40 X 4 Lcd Segment Driver For Low Multiplex Rates Up To 1 4
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
PCA8576D
Product data sheet
7.1 Power-on reset
The PCA8576D is a versatile peripheral device designed to interface any microcontroller
with a wide variety of LCDs. It can directly drive any static or multiplexed LCD containing
up to four backplanes and up to 40 segments.
The possible display configurations of the PCA8576D depend on the number of active
backplane outputs required. A selection of display configurations is shown in
of these configurations can be implemented in the typical system shown in
Table 4.
The host microprocessor or microcontroller maintains the 2-line I
channel with the PCA8576D. The internal oscillator is enabled by connecting
pin OSC to pin V
are generated internally. The only other connections required to complete the system are
to the power supplies (V
At power-on the PCA8576D resets to the following starting conditions:
Number of
Backplanes
4
3
2
1
Fig 3.
•
•
•
•
All backplane outputs are set to V
All segment outputs are set to V
The selected drive mode is: 1:4 multiplex with
Blinking is switched off
V
V
SS
DD
CONTROLLER
PROCESSOR/
The resistance of the power lines must be kept to a minimum.
For chip-on-glass applications, due to the Indium Tin Oxide (ITO) track resistance, each supply line
must be routed separately between the chip and the connector.
Typical system configuration
MICRO-
MICRO-
Selection of possible display configurations
HOST
R ≤
All information provided in this document is subject to legal disclaimers.
SS
2C
Icons
160
120
80
40
t
. The appropriate biasing voltages for the multiplexed LCD waveforms
r
B
Automotive 40 x 4 LCD segment driver for low multiplex rates
DD
Rev. 1 — 4 April 2011
, V
SS
OSC
and V
SDA
SCL
LCD
Digits/Characters
7-segment
20
15
10
5
LCD
LCD
A0
) and the LCD panel chosen for the application.
PCA8576D
A1
V
DD
A2
V
LCD
SA0
1

3
bias
14-segment
10
7
5
2
V
SS
40 segment drives
4 backplanes
2
C-bus communication
PCA8576D
© NXP B.V. 2011. All rights reserved.
Dot matrix/
Elements
160 (4  40)
120 (3  40)
80 (2  40)
40 (1  40)
LCD PANEL
(up to 160
elements)
Figure
013aaa469
Table
3.
4. All
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