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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72260G датащи(PDF) 112 Page - STMicroelectronics |
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ST72260G датащи(HTML) 112 Page - STMicroelectronics |
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112 / 171 page  ST72260G, ST72262G, ST72264G 112/171 11.7 10-BIT A/D CONVERTER (ADC) 11.7.1 Introduction The on-chip Analog to Digital Converter (ADC) pe- ripheral is a 10-bit, successive approximation con- verter with internal sample and hold circuitry. This peripheral has 6 multiplexed analog input chan- nels (refer to device pin out description) that allow the peripheral to convert the analog voltage levels from 6 different sources. The result of the conversion is stored in a 10-bit Data Register. The A/D converter is controlled through a Control/Status Register. 11.7.2 Main Features s 10-bit conversion s 6 channels with multiplexed input s Linear successive approximation s Data register (DR) which contains the results s Conversion complete status flag s On/off bit (to reduce consumption) The block diagram is shown in Figure 61. 11.7.3 Functional Description 11.7.3.1 Analog Power Supply VDDA and VSSA are the high and low level refer- ence voltage pins. In some devices (refer to device pin out description) they are internally connected to the VDD and VSS pins. Conversion accuracy may therefore be impacted by voltage drops and noise in the event of heavily loaded or badly decoupled power supply lines. Figure 61. ADC Block Diagram CH2 CH1 EOC SPEED ADON SLOW CH0 ADCCSR AIN0 AIN1 ANALOG TO DIGITAL CONVERTER AINx ANALOG MUX D4 D3 D5 D9 D8 D7 D6 D2 ADCDRH 3 fADC fCPU D1 D0 ADCDRL 0 0 00 00 0 fCPU, fCPU/2, fCPU/4 |
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