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PC8533-2 Datasheet PDF : 45 Pages
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NXP Semiconductors
PCF8533
Universal LCD driver for low multiplex rates
7. Functional description
The PCF8533 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 80 segments.
The display configurations possible with the PCF8533 depend on the number of active
backplane outputs required. A selection of display configurations is given in Table 4; all of
these configurations can be implemented in the typical system shown in Figure 3.
Table 4. Selection of display configurations
Number of
8-segment alphanumeric
Backplanes Elements Digits
Indicator symbols
4
320
40
40
3
240
30
30
2
160
20
20
1
80
10
10
15-segment alphanumeric
Characters
Indicator symbols
20
40
16
16
10
20
5
10
Dot matrix
320 (4 × 80)
240 (3 × 80)
160 (2 × 80)
80 (1 × 80)
VDD
R
≤
tr
2Cb
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
SDAACK
SDA
SCL
OSC
VDD VLCD
PCF8533
80 segment drives
4 backplanes
LCD PANEL
(up to 320
elements)
A0 A1 A2 SA0 VSS
mgl744
VSS
Fig 3. Typical system configuration
The host microprocessor or microcontroller maintains the 2-line I2C-bus communication
channel with the PCF8533.
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 VSS. The only other connections required to complete the system are the
power supplies (pins VDD, VSS and VLCD) and the LCD panel selected for the application.
7.1 Power-on reset
At power-on the PCF8533 resets to the following starting conditions:
1. All backplane outputs are set to VLCD.
2. All segment outputs are set to VLCD.
3. The selected drive mode is: 1:4 multiplex with 1⁄3 bias.
4. Blinking is switched off.
5. Input and output bank selectors are reset.
PCF8533_4
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 04 — 5 March 2010
© NXP B.V. 2010. All rights reserved.
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