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In the winter of 2006, I joined Logitech to become the manager responsible for electrical engineering/ rmware development for the Harmony remote control division. Previously, I had worked on big iron servers and workstations in which the power consumption of a few chips was insigni cant, especially when compared with the system processors that consumed 100 W of power or more. The Harmony remote controls operated at the other end of the spectrum; in order to get the best possible battery life, I had to calculate and measure every microamp of current when the unit was sending infrared (IR) or radiofrequency (RF) control codes and when it was in standby mode; this focus on detail resulted in products that lasted for a month or so on a single battery charge and was a far cry from my server experience, where things would come to a crashing halt if there was any interruption or sag in the power coming into the system. In my tenure at Logitech s Harmony remote controls, I really learned the value of understanding component current and power consumption and how to use this information to evaluate components or usage models to ensure that the product worked. In the following sections I would like to impart some of this knowledge to you and help you to think about how you can maximize the life of your designs.
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The three basic operating requirements for the PIC microcontroller are power, reset, and clocking. The PIC microcontroller is extremely tolerant of wide variances in power input and is quite tolerant of noise or sags in the supplied power, but this does not mean that you cannot avoid adding decoupling capacitors to the PIC microcontroller power input pins. These capacitors are used to lter the voltage both within and without the microcontroller, and during circuit transitions from one state to another, the internal voltages inside the chip will uctuate, which could cause the chip to lock up, reset, or behave unpredictably. Connecting a PIC microcontroller is very simple and only requires a 0.01- to 0.1- F decoupling capacitor across the Vdd and Vss pins (see Fig. 15.3). The capacitor is shown as being polarized because I normally use tantalum capacitors for decoupling, although ceramic disk or polyester capacitors can be used for this purpose. Electrolytic capacitors should not be used for this purpose because they cannot react quickly enough to quickly uctuating voltage levels. Tantalum capacitors are the best type of capacitor for decoupling, but there are a few things to watch for. The rst is the polarity of the capacitor; tantalum capacitors inserted backwards, like electrolytic capacitors, can catch re or explode. This is not an issue with ceramic disk or polyester caps. The second thing to watch for is to make sure that you derate the speci ed voltage of the part to 40 percent or less for your application. Derating capacitors means that instead of using them at their rated voltage, you choose capacitors that are rated at three times or more the voltage in the application in which you plan to use them. For my applications,
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Figure 15.3 A 0.01- to 0.1- F capacitor across the Vdd and Vss (and very close to the Vdd pin) will provide noise and current transition immunity to the PIC microcontroller.
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which use tantalum decoupling capacitors at 5 V, I use parts that are rated at 16 V (which is a derated value less than one-third of the rated value) to ensure proper and safe operation. When tantalum capacitors are rst powered up in an application, voltage spikes (which are caused by power supply startup and current transients within chips) can cause them to develop pinhole breakthroughs in the dielectric, which can cause the plates to touch. When the plates touch, heat is generated by the short circuit, which boils away more dielectric. This process snowballs until the part explodes or catches re. By derating the capacitor values, the dielectric layer is thicker, minimizing the opportunity for pinholes to develop.
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