pca85176 NXP Semiconductors, pca85176 Datasheet - Page 6

• Manufacturer Part Number: pca85176
• Description: Universal Lcd Driver For Low Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
Table 4.
PCA85176_1
Product data sheet
Number of:
Backplanes
4
3
2
1
Display configurations
Elements
160
120
80
40
7.1 Power-On Reset (POR)
The PCA85176 is a versatile peripheral device designed to interface any
microprocessor or 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 PCA85176 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 PCA85176. 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
the power supplies (V
At power-on the PCA85176 resets to the following starting conditions:
Fig 4.
•
•
•
•
•
•
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
The data pointer and the subaddress counter are cleared (set to logic 0)
7-segment alphanumeric
Digits
20
15
10
5
V
V
SS
DD
CONTROLLER
PROCESSOR/
2
The resistance of the power lines must be kept to a minimum.
Typical system configuration
C-bus interface is initialized
MICRO-
MICRO-
HOST
Indicator symbols
20
15
10
5
R ≤
All information provided in this document is subject to legal disclaimers.
SS
2C
. The appropriate biasing voltages for the multiplexed LCD waveforms
t
r
B
DD
Rev. 01 — 14 April 2010
, V
SS
, and V
SDA
OSC
SCL
14-segment alphanumeric
Characters
10
8
5
2
LCD
A0
) and the LCD panel chosen for the application.
PCA85176
A1
V
DD
Universal LCD driver for low multiplex rates
A2
V
LCD
SA0
Indicator symbols
20
8
10
12
1
⁄
LCD
3
V
bias
SS
40 segment drives
4 backplanes
2
C-bus communication
PCA85176
Dot matrix
160 dots (4 × 40)
120 dots (3 × 40)
80 dots (2 × 40)
40 dots (1 × 40)
© NXP B.V. 2010. All rights reserved.
LCD PANEL
(up to 160
elements)
013aaa051
Figure
Table
4.
4. All
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