43 ADC - Analog-to-Digital Converter with Computation and Context Module

The Analog-to-Digital Converter with Computation and Context module allows conversion of an analog input signal to a 12-bit binary representation of that signal. This device uses analog inputs that are multiplexed into a single Sample-and-Hold circuit. The output of the Sample-and-Hold (S/H) is connected to the input of the converter. The converter generates a 12-bit binary result via successive approximation and stores the conversion result into the ADC Result registers.

Additionally, the following features are provided within the ADC module:

• Acquisition timer
• Hardware Capacitive Voltage Divider (CVD) support:
  • Precharge timer
  • Adjustable Sample-and-Hold capacitor array
  • Guard ring digital output drive
• Automatic repeat and sequencing:
  • Automated double sample conversion for CVD
  • Two sets of Result registers (Current Result and Previous Result)
  • Auto-conversion trigger
  • Internal re-trigger
• Computation features:
  • Averaging and low-pass filter functions
  • Reference comparison
  • 2-level threshold comparison
  • Selectable interrupts
• Automated channel scanning and context switching
  • Supports up to four unique configurations
  • Each configuration is saved as a context
  • Stop on threshold interrupt during a scan
  • Unique threshold interrupt for each configuration

The ADC voltage reference is software selectable to be either internally generated or externally supplied.

The ADC can generate an interrupt upon completion of a conversion and upon threshold comparison. These interrupts can be used to wake up the device from Sleep.