SPRACK2 Application note

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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2.2 VREGENZ Pin

F28002x does not have a VREGENZ pin. The VREGENZ pin is converted to a GPIO (GPIO39) and the VREGENZ signal is internally tied low. Due to this, the internal VREG is always enabled and hence supplying the 1.2 V externally is not an option.

If using a F28002x device in a F28004x board, the VREGENZ pin can be used as GPIO39 or you can follow the unused pins practice for GPIOs found in the device-specific data sheet.

If using a F28004x device in a F28002x board, tie GPIO39 to VDDIO to supply the 1.2 V externally or tie GPIO39 to VSS to use the internal VREG.