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PCF8576D Datasheet(PDF) 7 Page - NXP Semiconductors

Part No. PCF8576D
Description  Universal LCD driver for low multiplex rates
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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PCF8576D Datasheet(HTML) 7 Page - NXP Semiconductors

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PCF8576D
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 10 — 14 February 2011
7 of 50
NXP Semiconductors
PCF8576D
Universal LCD driver for low multiplex rates
7.
Functional description
The PCF8576D 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 PCF8576D depend on the number of active
backplane outputs required. A selection of display configurations is shown in Table 4. All
of these configurations can be implemented in the typical system shown in Figure 4.
The host microprocessor or microcontroller maintains the 2-line I2C-bus communication
channel with the PCF8576D. The internal oscillator is enabled by connecting
pin OSC to pin VSS. The appropriate biasing voltages for the multiplexed LCD waveforms
are generated internally. The only other connections required to complete the system are
to the power supplies (VDD, VSS and VLCD) and the LCD panel chosen for the application.
7.1 Power-on reset
At power-on the PCF8576D resets to the following starting conditions:
All backplane outputs are set to VLCD
All segment outputs are set to VLCD
The selected drive mode is: 1:4 multiplex with 13 bias
Blinking is switched off
Table 4.
Selection of possible display configurations
Number of
Backplanes
Icons
Digits/Characters
Dot matrix/
Elements
7-segment
14-segment
4
160
20
10
160 (4
× 40)
3
120
15
7
120 (3
× 40)
280
10
5
80 (2
× 40)
140
5
240 (1
× 40)
The resistance of the power lines must be kept to a minimum.
For chip-on-glass applications, due to the Indium Tin Oxide (ITO) track resistance, each supply line
must be routed separately between the chip and the connector.
Fig 4.
Typical system configuration
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
tr
2CB
SDA
SCL
OSC
40 segment drives
4 backplanes
LCD PANEL
(up to 160
elements)
PCF8576D
A0
A1
A2
SA0
VDD
VSS
VSS
VDD
VLCD
mdb079
R


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