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STX-RLINK2 Datasheet(PDF) 70 Page - STMicroelectronics |
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STX-RLINK2 Datasheet(HTML) 70 Page - STMicroelectronics |
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70 / 124 page  ST7LITE0xY0, ST7LITESxY0 70/124 11.4 8-BIT A/D CONVERTER (ADC) 11.4.1 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 5 multiplexed analog input channels (refer to device pin out description) that allow the peripheral to convert the analog voltage levels from up to 5 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. 11.4.2 Main Features ■ 8-bit conversion ■ Up to 5 channels with multiplexed input ■ Linear successive approximation ■ Dual input range –0 to VDD or – 0V to 250mV ■ Data register (DR) which contains the results ■ Conversion complete status flag ■ On/off bit (to reduce consumption) ■ Fixed gain operational amplifier (x8) (not available on ST7LITES5 devices) 11.4.3 Functional Description 11.4.3.1 Analog Power Supply The block diagram is shown in Figure 44. VDD and VSS are the high and low level reference voltage pins. Conversion accuracy may therefore be impacted by voltage drops and noise in the event of heavily loaded or badly decoupled power supply lines. For more details, refer to the Electrical character- istics section. 11.4.3.2 Input Voltage Amplifier The input voltage can be amplified by a factor of 8 by enabling the AMPSEL bit in the ADAMP regis- ter. When the amplifier is enabled, the input range is 0V to 250 mV. For example, if VDD = 5V, then the ADC can con- vert voltages in the range 0V to 250mV with an ideal resolution of 2.4mV (equivalent to 11-bit res- olution with reference to a VSS to VDD range). For more details, refer to the Electrical character- istics section. Note: The amplifier is switched on by the ADON bit in the ADCCSR register, so no additional start- up time is required when the amplifier is selected by the AMPSEL bit. 1 |
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