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PCF8576CU/2 Datasheet(PDF) 9 Page - NXP Semiconductors

Part # PCF8576CU/2
Description  Universal LCD driver for low multiplex rates
PDF  56 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCF8576CU/2 Datasheet(HTML) 9 Page - NXP Semiconductors

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PCF8576C_9
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 09 — 9 July 2009
9 of 56
NXP Semiconductors
PCF8576C
Universal LCD driver for low multiplex rates
7.
Functional description
The PCF8576C 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 40 segments.
The display configurations possible with the PCF8576C depend on the number of active
backplane outputs required. Display configuration selection is shown in Table 4. All of the
display configurations given in Table 4 can be implemented in the typical system shown in
Figure 6.
The host microprocessor or microcontroller maintains the 2-line I2C-bus communication
channel with the PCF8576C.
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 PCF8576C resets to the following starting conditions:
• All backplane and segment outputs are set to VDD
• The selected drive mode is 1:4 multiplex with 1
⁄3 bias
• Blinking is switched off
• Input and output bank selectors are reset (as defined in Table 8)
Table 4.
Display configurations
Number of:
7 segment numeric
14-segment numeric
Dot matrix
Backplanes Elements
Digits
Indicator
symbols
Characters
Indicator
symbols
4
160
20
20
10
20
160 (4
× 40)
3
120
15
15
8
8
120 (3
× 40)
2
80
10
10
5
10
80 (2
× 40)
140
55212
40 (1
× 40)
Fig 6.
Typical system configuration
HOST
MICRO-
PROCESSOR/
MICRO-
CONTROLLER
R
≤
tr
2CB
SDA
SCL
OSC
40 segment drives
4 backplanes
LCD PANEL
(up to 160
elements)
PCF8576C
A0
A1
A2
SS
SA0 V
VSS
VDD
DD
V
LCD
V
013aaa098



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