Technical Session on Freescale most scalable MCU: Kinetis based on ARM Cortex M4 core. Presentation covers Key Positioning, Key differentiators, Kinetis overview along with Tools and Enablement offering from Freesale.
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How often are homeowners approached by a salesperson at the doorstep selling a device that can go in a wall and supposedly save energy or reduce the monthly electricity bill substantially? The so-called "power-saver device" (known by different names) is nothing but power-factor correction (PFC) device that connects to the mains and improves power factor, and thus the apparent power measured by the meter. However, it's important to notice that a residential user's utilities bill is based on real power rather than apparent power, and thus none of these devices really reduce their monthly bills. In this article, I explain the different power types that an electricity meter measures, power factor, and power factors' implications on power measurement. Although a PFC device may be useful for industrial applications, the additional cost does not really justify this device to be used in residential applications, contrary to the claims.
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Analog-to-digital converters (ADC) are advertised as having "n" bit resolution, which often is misunderstood to mean accuracy. Resolution does not imply accuracy nor does accuracy imply resolution. Application determines if missing codes are allowed and degree of accuracy required. This article illustrates some of the application examples to show significant difference between accuracy and resolution
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