32.4 ADC Charge Pump

The ADC module has a dedicated charge pump that can be controlled through the ADCPCON0 register. The primary purpose of the charge pump is to supply a constant voltage to the gates of transistor devices in the A/D converter, signal and reference input pass-gates, to prevent degradation of transistor performance at low operating voltage.

The charge pump can be enabled by setting the CPON bit. Once enabled, the pump will undergo a start-up time to stabilize the charge pump output. Once the output stabilizes and is ready for use, the CPRDY bit will be set.