PCA8534AH-Q900 NXP [NXP Semiconductors], PCA8534AH-Q900 Datasheet - Page 6

• Manufacturer Part Number: PCA8534AH-Q900
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
7. Functional description
Table 4.
PCA8534A_2
Product data sheet
Number of
Backplanes
4
3
2
1
Selection of display configurations
Elements
240
180
120
60
7.1 Power-On Reset (POR)
The PCA8534A is a versatile peripheral device designed to interface any microprocessor
or microcontroller to a wide variety of LCDs. It can directly drive any static or multiplexed
LCD containing up to four backplanes and up to 60 segments.
The possible display configurations of the PCA8534A 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
The host microprocessor or microcontroller maintains the 2-line I
channel with the PCA8534A.
Biasing voltages for the multiplexed LCD waveforms are generated internally, removing
the need for an external bias generator. The internal oscillator is selected by connecting
pin OSC to V
power supplies (V
At power-on the PCA8534A resets to a default starting condition:
Fig 3.
•
•
•
•
•
All backplane and segment outputs are set to V
The selected drive mode is: 1:4 multiplex with
Blinking is switched off
Input and output bank selectors are reset
The I
7-segment alphanumeric
Digits
30
22
15
7
V
V
DD
SS
2
Typical system configuration
C-bus interface is initialized
CONTROLLER
PROCESSOR/
MICRO-
MICRO-
SS
HOST
. The only other connections required to complete the system are the
All information provided in this document is subject to legal disclaimers.
R
DD
≤
Indicator symbols
30
26
15
11
2C
, V
t
r
b
SS
Rev. 02 — 1 June 2010
, and V
LCD
OSC
SDA
SCL
) and the LCD panel selected for the application.
A0
14-segment alphanumeric
Characters
16
12
8
4
PCA8534A
Universal LCD driver for low multiplex rates
A1
V
DD
A2
V
1
LCD
SA0
⁄
LCD
3
bias
Indicator symbols
16
12
8
4
V
SS
60 segment drives
4 backplanes
2
C-bus communication
PCA8534A
© NXP B.V. 2010. All rights reserved.
LCD PANEL
(up to 240
elements)
Figure
Dot matrix
240 (4 × 60)
180 (3 × 60)
120 (2 × 60)
60 (1 × 60)
013aaa270
Table
3.
4. All
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