SPRUIZ1B July 2023 – August 2024 TMS320F28P650DH , TMS320F28P650DK , TMS320F28P650SH , TMS320F28P650SK , TMS320F28P659DH-Q1 , TMS320F28P659DK-Q1 , TMS320F28P659SH-Q1
In internal reference mode, the device drives a voltage out onto the VREFHI pin. The VREFHI and VREFLO pins then set the ADC conversion range.
The internal reference voltage can be configured to be either 2.5V or 1.65V. When the 1.65V internal reference voltage is selected, the ADC input signal is internally divided by 2 before conversion, which effectively makes the ADC conversion range from VREFLO to 3.3V.
The 1.65V internal reference mode is not supported when the ADC is configured for 16-bit resolution.