NXP Semiconductors
PCF8566
Universal LCD driver for low multiplex rates
Pin description
…continued
Pin
13
14
15
16
17 to 40
LCD segment outputs
Description
LCD backplane outputs
Table 3.
Symbol
BP0
BP2
BP1
BP3
S0 to S23
[1]
The substrate (rear side of the die) is wired to V
DD
but should not be electrically connected.
7. Functional description
The PCF8566 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 4 backplanes and up to 24 segments.
The display configurations possible with the PCF8566 depend on the number of active
backplane outputs required. Display configuration selection is shown in
All of the
display configurations given in
can be implemented in the typical system shown in
The host microprocessor or microcontroller maintains the 2-line I
2
C-bus communication
channel with the PCF8566.
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
SS
. The only other connections required to complete the system are the
power supplies (pins V
DD
, V
SS
and V
LCD
) and the LCD panel selected for the application.
Table 4.
Display configurations
7-segment numeric
Digits
4
3
2
1
96
72
48
24
12
9
6
3
Indicator
symbols
12
9
6
3
14-segment numeric
Characters
6
4
3
1
Indicator
symbols
12
16
6
10
96 (4
×
24)
72 (3
×
24)
48 (2
×
24)
24
Dot matrix
Backplanes Elements
PCF8566_7
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 07 — 25 February 2009
6 of 48
PHILIPS [ NXP SEMICONDUCTORS ]
