NXP in-cell touch
display demo with
PCF8576E &
PCF8885
Segmented 4 x 40 display with in-cell
touch technology
This demoboard, developed through a partnership with Truly Semiconductors Ltd,
showcases touch-sensitive display technology that enhances user experiences and lowers
overall cost in industrial, medical, and consumer applications.
KEY FEATURES
`
Twisted Nematic (TN) display with 56 display elements and
5 touch buttons, designed and manufactured by Truly
`
In-cell ITO touch layer
`
LCD driver PCF8576E
- Bare die with bumps for COG applications
- Resolution: 4 x 40
`
Capacitive sensor PCF8885
- TSSOP28 package
- Eight sensor channels
APPLICATIONS
`
Industrial
- Small appliances
- White goods
- Measuring equipment
- General-purpose displays
`
Medical
- Blood pressure meters
- Blood glucose meters
- Digital thermometers
`
Consumer
- Entertainment devices
- Healthcare devices
The in-cell touch display demo makes it easy for engineers to
experiment with the latest technologies for touch-sensitive
passive LCD.
The demo highlights the features of the NXP Chip-on-Glass (COG)
LCD driver PCF8576E and the capacitive sensor PCF8885. The
PCF8576E requires no external components to generate the drive
signals for the LCD, and supports up to four backplanes and
40 segment drivers. The PCF8885, which offers adjustable
response times and continuous auto-calibration, provides dynamic
touch sensing with eight sensor channels. Both devices use the
I
2
C bus for serial communications. The NXP technology allows
avoiding any interference between the LCD driving signals and the
cap sensor signals, thus enabling the in-cell touch technology with
no need for expensive and complicated solutions.
IN-CELL TECHNOLOGY
Benefits of in-touch technology
`
Simpler structure
`
Lower build height
`
Easier assembly
`
Lower cost
Unlike on-cell technology, which adds an ITO touch layer on top
of the display glass, in-cell technology integrates touch-sensing
circuitry into the LCD array. The result is a simpler structure (two
ITO layers instead of three), a slimmer touch-sensitive screen, and
therefore a low-cost solution.
PCF8576E KEY FEATURES
`
40 segments and four backplane outputs
- Graphics with up to 160 display elements
- Up to 20 seven-segment numeric characters
- Up to 10 fourteen-segment alphanumeric characters
`
Multiplex rates selectable for static, 1:2, 1:3, and 1:4
`
LCD bias configuration selectable for static, 1/2 and 1/3
`
Independent supplies for LCD and logic voltages
`
Wide power supply range: 1.8 to 5.5 V
`
Wide LCD supply range: 2.5 to 6.5 V
`
Selectable internal or external oscillator
`
Frame frequency: 77 Hz (typ.)
`
Blinking function
`
Cascadable with up to 16 ICs to drive displays up to
16 x 160 elements
`
I
2
C-bus interface up to 400 kHz
`
Operating temperature range: -40 to 85 °C
`
Enhanced ESD/EMC performance
`
Bare die with bumps for cost-saving COG applications
`
AEC-Q100 compliant for automotive applications
(PCA8576D and PCA8576F versions only)
PCF8885TS KEY FEATURES
`
8-channel touch and proximity sensor with auto-calibration
`
Adjustable sensitivity and response time
`
Three sensing modes: one-key, two-keys, N-keys
- Up to eight sensors in one-key mode
- Up to 28 sensors in two-keys mode
`
Two event handling modes: push-button and toggle
`
I
2
C Fast-mode plus interface, up to 1 MHz
`
One sub-address for cascading two ICs (up to 64 sensors)
`
Power supply range: 2.5 to 5.5 V
`
Low power consumption
- 10 μA in operating mode
- 100 nA in sleep mode (activated via I
2
C or external input)
`
Operating temperature range: -40 to +85 °C
`
TSSOP28 package: 9.7 x 4.4 x 0.9 mm
`
AEC-Q100 compliant for automotive applications (PCA8885TS
version only)
ORDERING INFORMATION
Type
PCF8576EUG/2DA/1
PCF8885TS/1
Package and description
Bare die; 59 bumps; 2.2 x 2.0 x 0.4 mm
TSSOP28: plastic small outline package; 28 leads;
body size: 9.7 x 4.4 x 0.9 mm
Delivery format
Chip in tray
Tape and reel, 13 inch
IC version
1
1
www.nxp.com
© 2013 NXP Semiconductors N.V.
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The
information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and
may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof
does not convey nor imply any license under patent- or other industrial or intellectual property rights.
Date of release: September 2013
Document order number: 9397 750 17476
Printed in the Netherlands
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