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ST7MC1 Datasheet(PDF) 235 Page - STMicroelectronics |
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ST7MC1 Datasheet(HTML) 235 Page - STMicroelectronics |
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235 / 308 page  ST7MC1/ST7MC2 235/308 10.8 10-BIT A/D CONVERTER (ADC) 10.8.1 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 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 2 8-bit Data Registers. The A/D converter is controlled through a Control/Status Register. 10.8.2 Main Features ■ 10-bit conversion ■ Up to 16 channels with multiplexed input ■ 2 software-selectable sample times ■ External positive reference voltage VREF+ can be independent from supply ■ Linear successive approximation ■ Data registers (DR) which contain the results ■ Conversion complete status flag ■ Maskable interrupt ■ On/off bit (to reduce consumption) The block diagram is shown in Figure 127. 10.8.3 Functional Description 10.8.3.1 Analog References VREF+ and VREF- are the high and low level refer- ence voltage pins. Conversion accuracy may therefore be impacted by voltage drops and noise on these lines. VREF+ can be supplied by an inter- mediate supply between VDDA and VSSA to change the conversion voltage range. VREF- must be tied to VSSA. An internal resistor bridge is im- plemented between VREF+ and VREF- pins, with a typical value of 15kΩ 10.8.3.2 Analog Power Supply VDDA and VSSA are the supply and ground pins providing power to the converter part. They must be tied to VDD and VSS respectively. Figure 127. ADC Block Diagram CS2 CS1 EOC PRSC1PRSC0 ADON CS0 ADCCSR AIN0 AIN1 ANALOG TO DIGITAL CONVERTER AINx ANALOG MUX D4 D3 D5 D9 D8 D7 D6 D2 ADCDRMSB 4 fADC D1 D0 ADCDRLSB PRESCALER 0 0 00 00 CS3 MCCBCR IT request ADCIE ADSTS |
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