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C8051F300 Datasheet(PDF) 34 Page - List of Unclassifed Manufacturers |
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C8051F300 Datasheet(HTML) 34 Page - List of Unclassifed Manufacturers |
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34 / 174 page  C8051F300/1/2/3/4/5 34 Rev. 2.6 5.1. Analog Multiplexer and PGA The analog multiplexers (AMUX0) select the positive and negative inputs to the PGA, allowing any Port pin to be measured relative to any other Port pin or GND. Additionally, the on-chip temperature sensor or the positive power supply (VDD) may be selected as the positive PGA input. When GND is selected as the negative input, ADC0 operates in Single-ended Mode; all other times, ADC0 operates in Differential Mode. The ADC0 input channels are selected in the AMX0SL register as described in SFR Definition 5.1. The conversion code format differs in Single-ended versus Differential modes, as shown below. When in Single-ended Mode (negative input is selected GND), conversion codes are represented as 8-bit unsigned integers. Inputs are measured from ‘0’ to VREF x 255/256. Example codes are shown below. When in Differential Mode (negative input is not selected as GND), conversion codes are represented as 8-bit signed 2s complement numbers. Inputs are measured from –VREF to VREF x 127/128. Example codes are shown below. Important Note About ADC0 Input Configuration: Port pins selected as ADC0 inputs should be config- ured as analog inputs and should be skipped by the Digital Crossbar. To configure a Port pin for analog input, set to ‘0’ the corresponding bit in register P0MDIN. To force the Crossbar to skip a Port pin, set to ‘1’ the corresponding bit in register XBR0. See Section “12. Port Input/Output” on page 99 for more Port I/ O configuration details. The PGA amplifies the AMUX0 output signal as defined by the AMP0GN1-0 bits in the ADC0 Configuration register (SFR Definition 5.2). The PGA is software-programmable for gains of 0.5, 1, 2, or 4. The gain defaults to 0.5 on reset. 5.2. Temperature Sensor The typical temperature sensor transfer function is shown in Figure 5.2. The output voltage (VTEMP) is the positive PGA input when the temperature sensor is selected by bits AMX0P2-0 in register AMX0SL; this voltage will be amplified by the PGA according to the user-programmed PGA settings. Input Voltage ADC0 Output (Conversion Code) VREF x 255/256 0xFF VREF x 128/256 0x80 VREF x 64/256 0x40 0 0x00 Input Voltage ADC0 Output (Conversion Code) VREF x 127/128 0x7F VREF x 64/128 0x40 0 0x00 –VREF x 64/128 0xC0 –VREF 0x80 |
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