SPRACP6 December   2019 TMS320F2800132 , TMS320F2800133 , TMS320F2800135 , TMS320F2800137 , TMS320F2800152-Q1 , TMS320F2800153-Q1 , TMS320F2800154-Q1 , TMS320F2800155 , TMS320F2800155-Q1 , TMS320F2800156-Q1 , TMS320F2800157 , TMS320F2800157-Q1 , 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

 

  1.   How to Maximize GPIO Usage in C2000 Devices
    1.     Trademarks
    2. 1 Introduction
    3. 2 Zero Pin Boot Mode Option
      1. 2.1 Weak Pull-Up Method
      2. 2.2 Zero Pin Boot Mode Method
    4. 3 cJTAG Option
    5. 4 Zero Pin Internal Oscillator Option
    6. 5 CMPSS to Save Extra GPIO for Fast Protection
    7. 6 AIO Option
    8. 7 Using the GPDACs as General Purpose Outputs
    9. 8 Optional 1.2-V Internal DCDC
    10. 9 References

8 Optional 1.2-V Internal DCDC

The F28004x device has three options for supplying the 1.2 V VDD voltage:

  • An external supply (not available for 56-pin RSH package configurations)
  • Internal 1.2-V LDO Voltage Regulator (VREG)
  • Internal 1.2-V Switching Regulator (DC-DC)

The internal DC-DC regulator offers increased efficiency over the LDO for converting 3.3 V to 1.2 V. For detailed information on the DC-DC, see the TMS320F28004x Piccolo™ Microcontrollers Data Manual. Figure 4 shows the schematic implementation. If the internal DC-DC regulator is not used, VFBSW and VSW pin can be configured as GPIO22 and GPIO23, respectively. Note that VSW pin has an internal capacitance of approximately 100 pF, so it is suggested to use this pin only for applications that do not require a fast switching response.

dcdc.gifFigure 4. DC-DC Circuit Schematic