SPRACK2A September   2019  – March 2020 TMS320F280021 , TMS320F280021-Q1 , TMS320F280023 , TMS320F280023-Q1 , TMS320F280023C , TMS320F280025 , TMS320F280025-Q1 , TMS320F280025C , TMS320F280025C-Q1 , TMS320F280040-Q1 , TMS320F280040C-Q1 , TMS320F280041 , TMS320F280041-Q1 , TMS320F280041C , TMS320F280041C-Q1 , TMS320F280045 , TMS320F280048-Q1 , TMS320F280048C-Q1 , TMS320F280049 , TMS320F280049-Q1 , TMS320F280049C , TMS320F280049C-Q1

 

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2.1 Internal DC-DC Regulator

F28002x does not have the internal DC-DC regulator. Due to this, GPIO22 and GPIO23 do not have the alternate functions of VFBSW and VSW, respectively. Also, VDDIO_SW is just another VDDIO and VSS_SW is just another VSS.

If using a F28002x device in a F28004x board, DC-DC is not available so VFBSW (GPIO22) and VSW (GPIO23) can be used as regular GPIOs.

If using a F28004x device in a F28002x board, DC-DC is available so GPIO22 and GPIO23 can be used as the alternate functions VFBSW and VSW, respectively, for the DC-DC. However, due to how sensitive the DC-DC is to board layout, if the F28002x board was not built with a DC-DC layout in mind, it should not be used as such.