PCF85134HL-1 NXP [NXP Semiconductors], PCF85134HL-1 Datasheet - Page 6

• Manufacturer Part Number: PCF85134HL-1
• Description: Universal LCD driver for low multiplex rates
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
7. Functional description
Table 4.
PCF85134_1
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 PCF85134 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 display configurations possible with the PCF85134 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 PCF85134.
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 (pins V
At power-on, the PCF85134 resets to the following default starting conditions:
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
Input and output bank selectors are reset
7-segment alphanumeric
Digits
30
22
15
7
V
V
DD
SS
Typical system configuration
CONTROLLER
PROCESSOR/
SS
MICRO-
MICRO-
HOST
. The only other connections required to complete the system are the
R
Indicator symbols
30
26
15
11
2C
Rev. 01 — 17 December 2009
t
r
DD
b
, V
SS
and V
OSC
SDA
SCL
LCD
LCD
LCD
A0
) and the LCD panel selected for the application.
14-segment alphanumeric
Characters
16
12
8
4
Universal LCD driver for low multiplex rates
PCF85134
A1
V
DD
A2
V
1
LCD
SA0
3
bias
Indicator symbols
16
12
8
4
V
SS
60 segment drives
4 backplanes
2
C-bus communication
PCF85134
© NXP B.V. 2009. All rights reserved.
LCD PANEL
(up to 240
elements)
Figure
Dot matrix
240 (4
180 (3
120 (2
60 (1
013aaa206
Table
3.
60)
4. All
6 of 40
60)
60)
60)