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ST7DALI 데이터시트(PDF) 90 Page - STMicroelectronics |
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90 / 141 page ST7DALI 90/141 11.6 10-BIT A/D CONVERTER (ADC) 11.6.1 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 up to 7 multiplexed analog input channels (refer to device pin out description) that allow the peripheral to convert the analog voltage levels from up to 7 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. 11.6.2 Main Features ■ 10-bit conversion ■ Up to 7 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 52. 11.6.3 Functional Description 11.6.3.1 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. Figure 52. ADC Block Diagram CH2 CH1 EOC SPEED ADON 0 CH0 ADCCSR AIN0 AIN1 ANALOG TO DIGITAL CONVERTER AINx ANALOG MUX D4 D3 D5 D9 D8 D7 D6 D2 ADCDRH 3 D1 D0 ADCDRL 00 0 AMP SLOW AMP 0 RADC CADC HOLD CONTROL x 1 or x 8 AMPSEL bit SEL fADC fCPU 0 1 1 0 DIV 2 DIV 4 SLOW bit CAL 1 |
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