This register selects the trigger source, enables the common ADC interrupt, and allows software trigger generation for Analog Input Pair 8 and Pair 9.ĪDCPC5: ADC Convert Pair Control Register 5 This register selects the trigger source, enables the common ADC interrupt, and allows software trigger generation for Analog Input Pair 6 and Pair 7.ĪDCPC4: ADC Convert Pair Control Register 4 This register selects the trigger source, enables the common ADC interrupt, and allows software trigger generation for Analog Input Pair 4 and Pair 5.ĪDCPC3: ADC Convert Pair Control Register 3
This register selects the trigger source, enables the common ADC interrupt, and allows software trigger generation for Analog Input Pair 2 and Pair 3.ĪDCPC2: ADC Convert Pair Control Register 2 This register selects the trigger source, enables the common ADC interrupt, and allows software trigger generation for Analog Input Pair 0 and Pair 1.ĪDCPC1: ADC Convert Pair Control Register 1 This register configures the analog input pins as analog inputs or digital I/O.ĪDPCFG2: ADC Port Configuration Register 2ĪDCPC0: ADC Convert Pair Control Register 0 It is read in the common ADC interrupt to branch to the specific analog pair handler. This register contains a unique offset value based on the analog input pair that caused the common ADC interrupt. The Pair Data Ready flag is cleared in the specific pair handler. This register contains the Pair Data Ready (PxRDY) flag to indicate the analog input pair that caused the common ADC interrupt. This register configures the sample conversion sequence, enables the ADC module, and is used to set up the clock divider for the ADC clock. The following lists the specific functions of the high-speed 10-Bit ADC module registers: Register Name On a conversion request, the dedicated S&H circuit allows the corresponding analog input to be sampled without any latency (zero latency). For example, the dedicated S&H circuit ( SH0) samples AN0 (see figure below). The first four even numbered analog inputs in both single and dual SAR devices have a dedicated Sample & Hold (S&H) circuit. The technique of using pairs is particularly useful in power conversion applications that require voltage and current measurements for each PWM control loop. Each analog input pair is a combination of an even and odd numbered analog input, such as AN0 and AN1, AN2 and AN3, and so on. The 26 analog inputs available on the ADC module are grouped into thirteen analog input pairs. To monitor the reference voltages, two internal inputs: AN24 and AN25, are connected to the external reference source (EXTREF) and internal bandgap voltages (1.2V), respectively. This module supports up to 24 external analog inputs and two internal analog inputs.
The high-speed 10-bit ADC module converts the analog inputs in pairs. Without PFC, the ratio of the power factor deviates from a constant, the input contains phase displacement, harmonic distortion, or both, which ultimately degrades the Power Factor. The results of these are energy consumption reduction and an increase in power efficiency. These waveforms show that the PFC can improve the input current drawn from the main supply and reduce the DC voltage ripple. The waveforms of the current with and without PFC are shown below. Power Factor becomes an important measurable quantity because it often results in significant economic savings. Because Power Factor (PF) is a parameter that gives the amount of working power used by any system in terms of the total apparent power. This leads to the implementation of the Power Factor Correction (PFC) using dsPIC® DSC. At power levels of more than 500 watts (W), these problems become more pronounced. When this type of current is drawn from the mains supply, the resulting network losses, the total harmonic content, and the radiated emissions become significantly higher. The current drawn is of short duration regardless of the load connected to the system and discontinuous. Please refer to the input current waveform of the PFC boost converter above. Current pulses with high peak amplitude are drawn from this rectified voltage source. Since many applications demand a DC voltage source, a rectifier with a capacitive filter is necessary.
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