June, 2016
www.us-
tech.com
used to create an alternative to pressure cuffs or could be embedded in future fitness and smart watches that currently only measure heart rate. Even within the realm of capacitive sensors,
there are different methods to detect a person’s input. In the most familiar use, capacitive touch- screens used in smartphones utilize a layer of capacitive material to hold an electrical charge. Touching the screen changes the amount of charge at a specific point of contact. PPS sensors, however, differ by incorporating
two built-in electrodes separated by a compressible gap, eliminating the need to use the electrical charge delivered by the human finger. As a result, sensor activation can be performed by a user with a gloved hand, for example medical or laboratory personnel, or any other object that can apply force. In some applications, this can protect against
unintended activation of a sensor by a user acci- dentally brushing past it. It also facilitates the measurement of pro- portional force, data which can be utilized to improve the user interface and perform different functions, such as accelerated scrolling, based on the amount of force applied.
Complexity of Design If there has been a barrier to
adoption of capacitive-based force sensors, it can be attributed to the complexity of design, adding to the costs, vs. resistive technologies. However, with the decreasing cost of capacitive sensor ICs and microcon- trollers, due to its broad adoption for touch screen applications as well as advancements in capacitive sensors manufacturing techniques, more affordable capacitive force sensors are now available. PPS, for example, has devel-
oped a new breed of miniature capac- itive force sensors called SingleTact, which are designed to allow engi- neers to conduct feasibility studies, create prototypes, and even inte- grate into next-generation products. These ultra-thin single-element
sensors accurately and reliably quantify force at a discrete point as low as 1 gram. The SingleTact is aimed for use by inventors, OEMs, and in university research. “These single element sensors deliver supe- rior sensitivity and repeatability over resistive options that have been
JTAG and Boundary Scan
Continued from page 56
offered by proprietary 1149.1 to 1149.1-addressable bridge devices. The path of JTAG development
has not always been straightfor- ward. In the endless maze that encompasses electronics develop- ment, and in built-in self-test (BIST) structures for PCBAs in particular, several dead-ends have been met. Much good work has now been put into everyday use while other devel- opments have withered on the vine. The challenge is to develop viable test methods that can be both stan- dardized and used profitably. Contact: JTAG Technologies,
111 N. West Street, Suite A, Easton, Maryland 21601 % 410-770-4415 fax: 410-770-4774 E-mail:
info@jtag.com Web:
www.jtag.com r
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the only choice on the market,” says Dr. Son. The miniature force sensor is available in two
Page 59
Next-Gen Product Designs Using Capacitive Force Sensors Continued from previous page
sizes, each with three force options, and comes with a small microcontroller that performs the capacitance conversion. For more sophisticated applications, up to 128 single element sensors can
be daisy-chained together with a single interface. To further facilitate the integration of the
technology, PPS is providing all the schematics, data acquisition software, and open source sample code for Arduino and Windows PC. For those engi- neers who require it, the SingleTact can also oper- ate in analog mode. “As capacitive sensors have become more per-
vasive in the industry, more people want to under- stand how to measure different levels of force,” says Dr. Son. “We felt it was important to provide force sensors that were affordable and available in an open source environment, so that product designers can evaluate and experience the technology.” Contact: Pressure Profile Systems, 5757
Calibrated SingleTact package.
Century Boulevard, Suite 600, Los Angeles, CA 90045 % 310-641-8100 fax: 310-507-0229 E-mail:
info@pressureprofile.com or e-mail
info@singletact.com Web:
www.singletact.com r
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