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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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PIC16F684 датащи(PDF) 57 Page - Microchip Technology |
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PIC16F684 датащи(HTML) 57 Page - Microchip Technology |
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57 / 192 page  © 2007 Microchip Technology Inc. DS41202F-page 55 PIC16F684 8.0 COMPARATOR MODULE Comparators are used to interface analog circuits to a digital circuit by comparing two analog voltages and providing a digital indication of their relative magnitudes. The comparators are very useful mixed signal building blocks because they provide analog functionality independent of the device program execution. The analog Comparator module includes the following features: • Dual comparators • Multiple comparator configurations • Comparator outputs are available internally/ externally • Programmable output polarity • Interrupt-on-change • Wake-up from Sleep • Timer1 gate (count enable) • Output synchronization to Timer1 clock input • Programmable voltage reference 8.1 Comparator Overview A comparator is shown in Figure 8-1 along with the relationship between the analog input levels and the digital output. When the analog voltage at VIN+ is less than the analog voltage at VIN-, the output of the comparator is a digital low level. When the analog voltage at VIN+ is greater than the analog voltage at VIN-, the output of the comparator is a digital high level. FIGURE 8-1: SINGLE COMPARATOR This device contains two comparators as shown in Figure 8-2 and Figure 8-3. The comparators are not independently configurable. Note: Only Comparator C2 can be linked to Timer1. – + VIN+ VIN- Output Output VIN+ VIN- Note: The black areas of the output of the comparator represents the uncertainty due to input offsets and response time. |
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