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ST72P63BE1M1 Datasheet(PDF) 98 Page - STMicroelectronics |
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ST72P63BE1M1 Datasheet(HTML) 98 Page - STMicroelectronics |
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98 / 145 page 
ST7263BDx ST7263BHx ST7263BKx ST7263BE 98/145 12.6 8-bit A/D converter (ADC) 12.6.1 Introduction The on-chip Analog to Digital Converter (ADC) pe- ripheral is a 8-bit, successive approximation con- verter 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. 12.6.2 Main features ■ 8-bit conversion ■ Up to 12 channels with multiplexed input ■ Linear successive approximation ■ Data register (DR) which contains the results ■ Conversion complete status flag ■ On/off bit (to reduce consumption) The block diagram is shown in Figure 47. 12.6.3 Functional description 12.6.3.1 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. See electrical characteristics section for more de- tails. Figure 47. 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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