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PDF PCF85162 Data sheet ( Hoja de datos )
| Número de pieza | PCF85162 | |
| Descripción | Universal LCD driver | |
| Fabricantes | NXP Semiconductors | |
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PCF85162
Universal LCD driver for low multiplex rates
Rev. 3 — 16 June 2011
Product data sheet
1. General description
The PCF85162 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 32 segments. It can be easily
cascaded for larger LCD applications. The PCF85162 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, by
hardware subaddressing, and by display memory switching (static and duplex drive
modes).
2. Features and benefits
Single chip LCD controller and driver
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
32 segment drives:
Up to sixteen 7-segment numeric characters
Up to eight 14-segment alphanumeric characters
Any graphics of up to 128 elements
32 4-bit RAM for display data storage
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 V 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 twisted nematic LCDs
Low power consumption
400 kHz I2C-bus interface
No external components required
Manufactured in silicon gate CMOS process
1. The definition of the abbreviations and acronyms used in this data sheet can be found in Section 17.
1 page  
NXP Semiconductors
PCF85162
Universal LCD driver for low multiplex rates
7. Functional description
The PCF85162 is a versatile peripheral device designed to interface between any
microcontroller to a wide variety of LCD segment or dot matrix displays (see Figure 3). It
can directly drive any static or multiplexed LCD containing up to four backplanes and up to
32 segments.
dot matrix
7-segment with dot
14-segment with dot and accent
Fig 3. Example of displays suitable for PCF85162
013aaa312
The possible display configurations of the PCF85162 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.
Table 4. Selection of possible display configurations
Number of
Backplanes
Icons
Digits/Characters
7-segment[1]
14-segment[2]
4
128 16
8
3 96 12 6
2 64 8 4
1 32 4 2
[1] 7 segment display has 8 elements including the decimal point.
[2] 14 segment display has 16 elements including decimal point and accent dot.
Dot matrix/
Elements
128 dots (4 32)
96 dots (3 32)
64 dots (2 32)
32 dots (1 32)
PCF85162
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 16 June 2011
© NXP B.V. 2011. All rights reserved.
5 of 46
5 Page 
NXP Semiconductors
PCF85162
Universal LCD driver for low multiplex rates
7.4.2 1:2 Multiplex drive mode
When two backplanes are provided in the LCD, the 1:2 multiplex mode applies. The
PCF85162 allows the use of 1⁄2 bias or 1⁄3 bias in this mode as shown in Figure 7 and
Figure 8.
BP0
BP1
Sn
Sn+1
VLCD
VLCD/2
VSS
VLCD
VLCD/2
VSS
VLCD
VSS
VLCD
VSS
state 1
state 2
VLCD
VLCD/2
0V
−VLCD/2
−VLCD
VLCD
VLCD/2
0V
−VLCD/2
−VLCD
Tfr
LCD segments
state 1
state 2
(a) Waveforms at driver.
(b) Resultant waveforms
at LCD segment.
013aaa208
Fig 7.
Vstate1(t) = VSn(t) VBP0(t).
Von(RMS) = 0.791VLCD.
Vstate2(t) = VSn(t) VBP1(t).
Voff(RMS) = 0.354VLCD.
Waveforms for the 1:2 multiplex drive mode with 1⁄2 bias
PCF85162
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 3 — 16 June 2011
© NXP B.V. 2011. All rights reserved.
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| Páginas | Total 30 Páginas | |
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