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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ATtiny43U датащи(PDF) 37 Page - ATMEL Corporation |
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ATtiny43U датащи(HTML) 37 Page - ATMEL Corporation |
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37 / 182 page  37 8048B–AVR–03/09 Figure 8-2. Typical Connection of Boost Converter. When the boost converter is not connected the microcontroller can be powered directly from an external source and is then subject to the standard supply voltage limits defined in “Electrical Characteristics” on page 155. It is recommended to disable the Brown-Out Detection (BOD) circuit when using the integrated boost converter. This is because supply voltage of the microcontroller can drop to lowest BOD levels during regular operation. See “Brown-out Detection” on page 50. 8.2 Modes of Operation The boost converter has three main modes of operation; Stop, Start, and Active. Operation begins from Stop Mode and is transferred to Start Mode when input voltage, V BAT, is sufficiently high for stable operation. When the converter has managed to raise the output voltage, V CC, to a sustainable level control is then transferred to the main mode of operation, Active Mode. The modes of operation are illustrated in Figure 8-3, below. Figure 8-3. Operating Modes of Boost Converter. PB0 PB1 PB2 PB3 PB4 PB5 PB6 PB7 VCC GND PA7 PA6 PA5 PA4 PA3 PA2 PA1 PA0 VBAT LSW C4 C3 C2 C1 R1 L1 D1 VIN START MODE STOP MODE < V ST OP FIR MW A VCC < VBOOS T V CC > VBOOST ENTRY REGULATED LOW CURRENT ACTIVE MODE |
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