New touchscreen technology aims to stifle electrical noise
June 13, 2011 // Paul Buckley
STMicroelectronics has unveiled the company's new FingerTip technology, which enables a single-chip solution for capacitive touchscreens up to 10 inches in diameter with multi-touch capability.
ST's MEMS sensors and FingerTip technology share a similar architecture, in which a sensing element is connected to a high-performance capacitance-sensing circuit. ST has applied its know-how in analog and mixed-signal interface technology to develop an innovative analog-front-end that is able to detect variations of capacitance in atto-Farads (10- F) and to immunize the system against noise.
Touchscreen applications are subject to noise coming from various sources, including the display, the system, human touch, or battery chargers. Low-cost and poor-quality chargers, in particular, are a source of noise that can be as high as tens of volts and can affect normal operations when a finger touches the screen. When this happens, a strong periodic noise - which could be in the range of 100 V (peak-to-peak) and in the frequency range from 1kHz to 1MHz - will enter into the touchscreen controller's analog front-end and result in 'false' finger touches.
The new FingerTip capacitive sensing technology with its powerful 32-bit DSP (Digital Signal Processing) engine is able to eliminate this sort of charger noise effect and reach higher immunity levels without reducing performance in terms of accuracy, frame rate and power consumption. FingerTip has also been designed to eliminate noises from displays and works with both 'in-cell' and 'on-cell' display technologies.
"Noise from battery chargers pose a special issue for touchscreens, resulting in a poor user experience," said Benedetto Vigna, General Manager of MEMS, Sensors and High Performance Analog Division. "Our leadership in analog capacitive interface IP, developed for MEMS sensors, will allow us to achieve higher noise rejection prior to digital filtering. This new FingerTip technology is able to achieve faster response time, low-power consumption and higher noise rejection required for high-end portable applications."
ST's new product family, based on the new technology, is under evaluation with major customers that can benefit from the FingerTip's: hand writing capability with a small stylus; fast response time; ultra-low power consumption; best linearity and accuracy in noisy conditions; and tiny package suitable for smart phones and 10-inch tablets.
Visit STMicroelectronics at www.st.com.
Optimized RF Silicon-On-Insulator (SOI) drives monolithic integration of multi-band radios
June 19, 2013
STMicroelectronics has developed a silicon-on-insulator (SOI) CMOS process that can integrate all the RF functions of multi-band ...
Fully certified FlexRay transceiver enables ESD robust in-vehicle communication
IoT will be next silver screen, says media exec
Hard drives to hit billion-dollar mark by 2017 in video-surveillance applications, says IHS
Li-ion energy storage technology helps make smart grid for Pellworm Island even smarter
Data Fusion: the next frontier of software integration
June 19, 2013
In the last few years, the functionality of our mobile devices has come so far that consumers now treat them more like personal ...
“Prototype to Production”, the new Digi-Key trademark
STMicro signs memory design agreement with Rambus
X-FAB optimizes 180nm process for portable analog applications
InterviewSilica moves to fast lane in Europe's LED market
In the booming market for LED lighting, electronics distributor Silica intends to lead the pack by offering technological excellence at application level. The company is currently planning to offer tailor-made ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
The SoCKIT evaluation kit is Arrow's latest development tool, featuring an Altera Cyclone V SoC with a dual-core ARM Cortex-A9 MPCore processor integrated within its 28nm FPGA fabric.
Altera SoCs allow embedded system developers to differentiate their end product with customized hardware and software, and extend the product lifecycle through hardware and software updates in the field. This month, Arrow Electronics is giving away five SoCKIT evaluation kits featuring Altera’s ARM-Based SoCs, worth €249 each, together with the free entrance to one of Arrow’s SoC workshops organized throughout Europe.
And the winners are...
In our previous reader offer, Freescale Semiconductor was giving away five IMX6Q, Sabre-lite kits, worth £128.06 each.
Lucky winners include Mr. X. Salada Sole from the UK, Mrs A. Peric from Germany, Mr Z. Janosy from Hungary, Mr D. Gacina from Croatia and Mr B. Boris from France. All should be receiving their packages soon. Let's wish them some interesting findings with their projects.
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.