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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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ST72734 датащи(PDF) 123 Page - STMicroelectronics |
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ST72734 датащи(HTML) 123 Page - STMicroelectronics |
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123 / 144 page  ST72774/ST727754/ST72734 123/144 4.10 8-BIT A/D CONVERTER (ADC) 4.10.1 Introduction The on-chip Analog to Digital Converter (ADC) peripheral is a 8-bit, successive approximation converter with internal sample and hold circuitry. This peripheral has up to 16 multiplexed analog input channels (refer to device pin out description) that allow the peripheral to convert the analog voltage levels from up to 16 different sources. The result of the conversion is stored in a 8-bit Data Register. The A/D converter is controlled through a Control/Status Register. 4.10.2 Main Features s 8-bit conversion s Up to 16 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 76. 4.10.3 Functional Description 4.10.3.1 Analog Power Supply VDDA and VSSA are the high and low level reference 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. See electrical characteristics section for more details. Figure 76. ADC Block Diagram CH2 CH1 CH3 COCO 0 ADON 0 CH0 ADCCSR AIN0 AIN1 ANALOG TO DIGITAL CONVERTER AINx ANALOG MUX RADC CADC D2 D1 D3 D7 D6 D5 D4 D0 ADCDR 4 DIV 4 fADC fCPU HOLD CONTROL |
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