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82 AVR HARDWARE DESIGN ISSUES
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FIGURE 5.1 A minimum configuration AVR circuit.
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Batteries are of two types: primary batteries (nonrechargeable) and secondary batteries (these can be recharged). These are available in various shapes and sizes. While selecting a battery for your application, the following issues need to be considered:
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1. Energy content or capacity. This is expressed in Ah (or mAh) (Ampere Hour or
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milliAmpere Hour). This is an important characteristic that indicates how long the battery can last before it discharges and becomes useless. For a given battery type, the capacity also dictates the battery size. A battery with a larger Ah rating will necessarily be bigger in volume than a similar battery with a smaller Ah rating. Voltage. The voltage provided by the battery. Storage. This indicates how the battery needs to be stored when not being used. Shelf life. This indicates how long the battery will last before it discharges on its own. There is no point in buying a stock of batteries for the next 10 years if the shelf life of the batteries is, say, only 1 year. Operating temperature. Batteries have notoriously poor temperature characteristics. This is because the batteries depend upon chemical reaction to produce power and the chemical reaction is temperature dependent. Batteries perform rather poorly at low temperatures. Duty cycle. Some batteries perform for a longer period of actual usage time if they are used intermittently. The duty cycle of the battery indicates if the battery can be used continuously or not, without loss of performance.
Primary batteries
Primary batteries are those that cannot be recharged. Once they lose energy, they have to be replaced. Primary batteries are of different types. Most common are the zinc chloride with carbon electrodes dry cells. The cell voltage is 1.5 V These . are the cheapest of all the primary batteries. Increasingly, alkaline cells also of 1.5 V are becoming popular. They have a higher capacity compared to the zinc chloride cells. Alkaline cells also have higher shelf life than the zinc chloride cells. Another type of primary battery is the lithium battery with a cell voltage of 3.0 V These batteries are .
POWER SOURCE 83
expensive compared to the zinc chloride and the alkaline batteries but have much higher energy density and shelf life of up to 10 years.
Secondary batteries Secondary batteries have the advantage that they can be recharged
after being discharged. Most popular of these batteries is the NiCd (nickel cadmium) and the lead acid batteries. The NiCd batteries have a cell voltage of 1.2 V the so-called 9-V box type , NiCd batteries are actually about 8.2 V The lead-acid batteries have a cell voltage of 2.0 V . . Lead-acid batteries of the so-called sealed variety are safe for use in portable instruments. Contrary to the lead-acid batteries used in cars, these do not pose any danger of leaking. Lead-acid batteries have higher energy density than NiCd. The lead-acid batteries also have a relatively larger retention compared to the NiCd batteries. Secondary batteries perform well if they are recharged regularly. If these batteries are discharged more than a certain minimum, their operational life reduces drastically. Batteries are charged at a fraction of their Ah rating. Typically, lead-acid batteries are charged at a tenth of the Ah rating of the battery. NiCd batteries, on the other hand, are quite quirky. NiCd batteries are recommended to be initially charged at a tenth of the Ah rating and then switched over to trickle charging at a fraction (1/50) of the Ah rating.
MAIN OPERATING SUPPLY
Using AC wall supply is another alternative (and another being solar cells) to batteries. For embedded applications, a step-down transformer can either be integrated into the application or provided as a wall plug-in unit. Such units are very popular for small applications requiring a couple of watts of power. Figure 5.2 illustrates the rectifier and filter unit that can be fed by a wall plug-in transformer. The rectifier could be built with discrete rectifier diodes (such as 1N4001), or even a complete rectifier unit be used. The rectifier should be suitably rated, keeping in mind the current requirements. If the power supply unit is to provide 500 mA of current, the diodes should be rated at at least 1A. The other rating of the diode to consider is the PIV (peak inverse voltage). This is the maximum peak reverse voltage that the diode can withstand before breaking down. An 1N4001 diode has a PIV of 50 V and 1N4007 is rated to 1000 V , .
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