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PDF PCF8576C Data sheet ( Hoja de datos )
| Número de pieza | PCF8576C | |
| Descripción | Universal LCD driver for low multiplex rates | |
| Fabricantes | NXP Semiconductors | |
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PCF8576C
Universal LCD driver for low multiplex rates
Rev. 13 — 16 December 2013
Product data sheet
1. General description
The PCF8576C is a peripheral device which interfaces to almost any Liquid Crystal
Display (LCD)1 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 and can easily
be cascaded for larger LCD applications. The PCF8576C is compatible with most
microcontrollers and communicates via the two-line bidirectional I2C-bus. Communication
overheads are minimized by a display RAM with auto-incremented addressing and by
hardware subaddressing.
For a selection of NXP LCD segment drivers, see Table 24 on page 52.
2. Features and benefits
Single-chip LCD controller and driver
40 segment drives:
Up to twenty 7-segment alphanumeric characters
Up to ten 14-segment alphanumeric characters
Any graphics of up to 160 elements
Versatile blinking modes
No external components required (even in multiple device applications)
Selectable backplane drive configuration: static, 2, 3, or 4 backplane multiplexing
Selectable display bias configuration: static, 1⁄2, or 1⁄3
Internal LCD bias generation with voltage-follower buffers
40 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
Wide logic LCD supply range:
From 2 V for low-threshold LCDs
Up to 6 V for high-threshold twisted nematic LCDs
Low power consumption
May be cascaded for large LCD applications (up to 2560 elements possible)
No external components required
Separate or combined LCD and logic supplies
Optimized pinning for plane wiring in both single and multiple PCF8576C applications
Power-saving mode for extremely low power consumption in battery-operated and
telephone applications
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 20.
1 page  
NXP Semiconductors
PCF8576C
Universal LCD driver for low multiplex rates
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Top view. For mechanical details, see Figure 34.
Fig 3. Pin configuration for VSO56 (PCF8576CT/1)
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PCF8576C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 13 — 16 December 2013
© NXP B.V. 2013. All rights reserved.
5 of 62
5 Page 
NXP Semiconductors
PCF8576C
Universal LCD driver for low multiplex rates
D
=
-V----o---n----R---M----S---
VoffRMS
=
---a-----+-----1------2----+-------n-----–----1----
a – 12 + n – 1
(3)
Using Equation 3, the discrimination for an LCD drive mode of 1:3 multiplex with
1⁄2 bias is 3 = 1.732 and the discrimination for an LCD drive mode of 1:4 multiplex with
1⁄2 bias is
-----2---1--
3
=
1.528 .
The advantage of these LCD drive modes is a reduction of the LCD full scale voltage VLCD
as follows:
• 1:3 multiplex (1⁄2 bias): VLCD = 6 VoffRMS = 2.449VoffRMS
• 1:4 multiplex (1⁄2 bias): VLCD =
---4--------------3----
3
= 2.309VoffRMS
These compare with VLCD = 3VoffRMS when 1⁄3 bias is used.
VLCD is sometimes referred as the LCD operating voltage.
7.3.1 Electro-optical performance
Suitable values for Von(RMS) and Voff(RMS) are dependent on the LCD liquid used. The
RMS voltage, at which a pixel will be switched on or off, determine the transmissibility of
the pixel.
For any given liquid, there are two threshold values defined. One point is at 10 % relative
transmission (at Vth(off)) and the other at 90 % relative transmission (at Vth(on)), see
Figure 7. For a good contrast performance, the following rules should be followed:
VonRMS Vthon
VoffRMS Vthoff
(4)
(5)
Von(RMS) and Voff(RMS) are properties of the display driver and are affected by the selection
of a (see Equation 1), n (see Equation 3), and the VLCD voltage.
Vth(off) and Vth(on) are properties of the LCD liquid and can be provided by the module
manufacturer. Vth(off) is sometimes named Vth. Vth(on) is sometimes named saturation
voltage Vsat.
It is important to match the module properties to those of the driver in order to achieve
optimum performance.
PCF8576C
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 13 — 16 December 2013
© NXP B.V. 2013. All rights reserved.
11 of 62
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet PCF8576C.PDF ] | |
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