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MSP430 Microcontrollers with FRAM Slide 9

Nothing conveys the benefits previously discussed like real world applications. One of the key end pieces of equipment where FRAM is useful today is in wireless sensor networks. This presentation will examine a few of these in detail. First, civil engineers are working to make bridges smarter by embedding stress sensors. One limitation faced is the cost of replacement or maintenance. Systems that utilize the energy generated from the vibrations of passing vehicles require a battery with an extremely long life. FRAM enables this long life with low power active power consumption. In addition, the guaranteed write allows designers to be much more comfortable working with variable power supplies like mechanical transducers. Another energy harvesting application are light switches that use the flick of a switch to power an RF transmission. Once again, FRAM is the best choice in that case because of the ability to turn on, record, and transmit information much more quickly than a typical flash microcontroller. The second type of challenge is in monitoring life critical applications like seismology. Because crucial signals can fluctuate in a matter of milliseconds during seismic events, the high write endurance and low power consumption of FRAM microcontrollers ensure that seismic sensors can continuously record and transmit these signals with greater accuracy while maximizing battery life. The final challenge in data logging has to do with the limited write cycles and high power requirements of conventional non-volatile memory. This means the designer has to limit the frequency of sampling to account for the desired life of the sensor node. Desired product life divided by the number of write cycles, in this case 10,000, gives the highest frequency of measurement and recording. With FRAM, users are dividing by a number 109 times greater than with Flash. This removes the limit that many designers face today who have to slow down their sensors or practice wear leveling.

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