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FIGURE 5.2 A rectifier and filter unit.
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The peak rectified voltage that appears at the filter capacitor is 1.4 times the AC input voltage (AC input voltage is a RMS figure). A 10-V AC input will generate about 14 V DC voltage on the filter capacitor. The filter capacitor must be of sufficiently large capacity to provide sustained current. The filter capacitor must also be rated to handle the DC voltage. For a 14-V DC, at least a 25 V rating capacitor should be employed.
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Another source of power that is available most often if you are using a PC together with your application is the PC port signal lines, such as the parallel port and the serial RC232 port. If the PC is equipped with a USB port, it can be used to provide 5 V that is available on a USB connector. I have used the RS-232 signal power in many low-power applications. The RS-232 signals can provide up to 10 mA each. The output signals of the RS-232 port that can be used to provide supply voltage are:
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1. TxD: Output data signal from the RS-232 port. When idling, this signal is at
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12 V and can be used to provide -ve voltage to the circuit. 2. DTR: Data Terminal Ready. Output signal used for communicating with a modem. This can be used to provide either 12 or 12 V supply. However, when the signal is loaded, the voltage drops. Usually, a micropower regulator or even a zener diode can be used to get a lower supply voltage for the AVR processor. 3. RTS: Request to Send. Output control signal used for communicating with an external device. Can be used in a fashion similar to the DTR signal. The DTR and the RTS signals are controlled by the Modem Control Register (MCR) in a PC. The MCR is at an address offset 4 from the RS-232 base address. By writing $01 to the MCR, the DTR is set to 12 V and by writing $02, the RTS is set to 12 V while writ, ing $03 to the MCR, both the RTS and the DTR are set to 12. Table 5.1 illustrates all the combinations of voltages that you can get on the DTR and the RTS signal pins by writing the appropriate control word to the MCR. The following C code (rspower.c) shows how to put both the DTR and the RTS signal to 12 V .
TABLE 5-1 MCR CONTROL VALUES FOR DTR AND RTS SIGNAL VOLTAGES MCR VALUE RTS VOLTAGE DTR VOLTAGE
0 1 2 3
12 V 12 V 12 V 12 V
12 V 12 V 12 V 12 V
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/*rspower.c*/ /*Program segment to set DTR and RTS signal pins of the RS-232 port (COM1) to +12V*/ #include <stdio.h> #include <dos.h> main() { int MCR; MCR = peek(0x40, 0) +4; /*get the address of COM1 MCR regsiter*/ printf(`` nCOM1 MCR Address is: %x , MCR); outportb(MCR, 3); /*set MCR to assert DTR and RTS*/ }
Table 5.2 illustrates the voltage variation on the RTS signal pin when it is set to 12 V (nominal voltage) and then loaded with an AVR processor-based circuit. The power supply circuit for this arrangement is illustrated in Figure 5.3.
VOLTAGE REGULATORS
Voltage regulators are important to provide a stable voltage to the processor and the associated circuit, even though the input voltage may vary. Voltage regulators are broadly classified as linear or switching. The switching regulators are of two types: step up or step down. We shall look at some of the voltage regulators, especially the so-called micropower regulators. It is very common to use the 78XX type of three-terminal regulator. This regulator is made by scores of companies and is available in many package options. To power the AVR processor, you would choose the 7805 regulator for 5-V output voltage. It can provide up to 1-A output current and can be fed a DC input voltage between 9 V to 20 V You could . also choose an LM317 three-terminal variable voltage regulator and adjust the output voltage with the help of two resistors between 1.25 V and above. A voltage regulator is an active component, and when you use this to provide a stable output voltage, it also consumes some current. This current may run into tens of milliamperes and is called the quiescent or bias current. Micropower regulators are special voltage regulators that have extremely low quiescent current.
Micropower regulators The LP2950 and LP2951 are linear, micropower voltage regulators from National Semiconductor, with very low quiescent current (75 A typ.) and very low dropout voltage (typ. 40 mV at light loads and 380 mV at 100 mA maximum current).
TABLE 5-2
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