SPRUJ71 august 2023
The analog subsystem of the F28P65x allows for flexible voltage reference sources. The ADC modules are referenced to the VREFHIx and VREFLOx pin voltages. VREFHIx can either be driven externally or can be generated by an internal bandgap voltage reference. The on-board REF6230 device provides a high-precision 3.0 V reference with integrated buffer and is actively connected to the C2000 device when J15 is populated with a shunt. Otherwise, an external voltage can be supplied to the right-side pin of header J15 as an external voltage source for VREFHIx. Note that there is no signal conditioning circuitry in place for an external voltage reference. For best performance, some additional circuitry may be required.