NXP Semiconductors
UM10300
User Manual OM6290
UM10300_1
© NXP B.V. 2008. All rights reserved.
User manual
Rev. 1.0— 8 August 2008
9 of 30
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Resolutions that are not common in the market:
34 x 128, 65 x 133, 80 x 128.
3.1 Segment Driver PCF8576D
3.1.1 General
Description
The PCF8576D is a peripheral device which interfaces to almost any Liquid Crystal
Display (LCD) with low multiplex rates. It generates the drive signals for any static or
multiplexed LCD containing up to four backplanes and up to 40 segments. It can be
easily cascaded for larger LCD applications. The PCF8576D is compatible with most
microprocessors / microcontrollers and communicates via a two-line bidirectional I2C-
bus. Communication overheads are minimized by a display RAM with auto-incremented
addressing, by hardware sub-addressing and by display memory switching (static and
duplex drive modes). It has a lot in common with other NXP Segment Drivers such as
PCF8532 (4 x 160 segments), PCF8533 (4 x 80 segments), PCF8534A (4 x 60),
PCF8562 (4 x 32) and PCF8566 (4 x 24).
3.1.2 Features
single chip LCD controller / driver
selectable backplane drive configuration: static or 2 / 3 / 4 backplane multiplexing
selectable display bias configuration: static, 1/2 or 1/3
internal LCD bias generation with voltage-follower buffers
40 segment drives:
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up to twenty 8-segment numeric characters
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up to ten 15-segment alphanumeric characters
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any graphics of up to 160 elements
40 x 4-bit RAM for display data storage
auto-incremented display data loading across device subaddress boundaries
display memory bank switching in static and duplex drive modes
versatile blinking modes
independent supplies possible for LCD and logic voltages
wide power supply range: from 1.8 to 5.5 V
wide logic LCD supply range:
from 2.5 V for low-threshold LCDs
up to 6.5 V for guest-host LCDs and high-threshold (automobile) TN LCDs
low power consumption
400 kHz I
2
C-bus interface
compatible with 4, 8 or 16-bit microprocessors or microcontrollers
may be cascaded for large LCD applications (up to 2560 elements possible)
no
external
components
compatible with chip-on-glass and chip-on-board technology