pcf8534 NXP Semiconductors, pcf8534 Datasheet - Page 6

• Manufacturer Part Number: pcf8534
• Description: Universal Driver Multiplex Rates
• Manufacturer: NXP Semiconductors

NXP Semiconductors
6. Functional description
Table 4.
PCF8534_0
Preliminary datasheet
Number of
Backplanes
4
3
2
1
Selection of display configurations
Segments
240
180
120
60
Table 3.
The PCF8534 is a versatile peripheral device designed to interface any
microprocessor/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 PCF8534 depend on the number of active
backplane outputs required; a selection of display configurations is given in
All of the display configurations given in
shown in
The host microprocessor / microcontroller maintains the 2-line I
channel with the PCF8534. The internal oscillator is selected by connecting pad OSC
to V
generated internally. The only other connections required to complete the system are the
power supplies (V
Symbol
OSC
A0, A1 and A2
SA0
V
V
BP0, BP1, BP2 and BP3
S0 to S59
SS
LCD
SS
. The appropriate biasing voltages for the multiplexed LCD waveforms are
Figure
7 segment numeric
Digits
30
22
15
7
Pin description
3.
DD
Rev. 00.05 — 20 February 2007
, V
SS
and V
Indicator
symbols
30
26
15
11
Pin
43
44 to 46
47
48
49
30 to 33
50 to 80
and 1 to 29
LCD
) and the LCD panel selected for the application.
Table 4
Universal LCD driver for low multiplex rates
Description
internal oscillator enable input
subaddress inputs
I
logic ground
LCD supply voltage
LCD backplane outputs
LCD segment outputs
14 segment numeric
Characters
16
12
8
4
2
C-bus slave address input: [0]
can be implemented in the typical system
Indicator
symbols
16
12
8
4
2
C-bus communication
PCF8534
© NXP B.V. 2007. All rights reserved.
Dot matrix
240 (4 x 60)
180 (3 x 60)
120 (2 x 60)
Table
60 (1 x 60)
4.
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