SPRUIC4D January   2017  – June 2022

 

  1.   Piccolo F280049C controlCARD Information Guide
  2. 1Introduction
  3. 2Errata
    1. 2.1 Warnings, Notes, and Errata
  4. 3Getting Familiar With the controlCARD
    1. 3.1 F280049C controlCARD Features
    2. 3.2 F28004x Device Description
    3. 3.3 Assumed Operating Conditions
    4. 3.4 Using the controlCARD
    5. 3.5 Software Development
  5. 4Special Notes
    1. 4.1 XDS100v2 Emulator and SCI/UART Connectivity
    2. 4.2 cJTAG Usage
    3. 4.3 Evaluation of the Programmable Gain Amplifier (PGA)
    4. 4.4 Evaluation of the Analog-to-Digital Converters (ADCs)
    5. 4.5 Evaluation of the Internal DC/DC Converter
  6. 5Hardware References
  7. 6Revision History

4.5 Evaluation of the Internal DC/DC Converter

The controlCARD, by default, assumes the F280049C internal VREG will be used to generate the 1.2-V power supply required by the MCU. The controlCARD enables the user to use the internal DC/DC converter capabilities, with some soldering.

To enable the internal DC/DC converter:

  • R18 and R19 must be unpopulated.
  • R21 and R22 must be populated with a 0-Ω resistor.
  • C19 must be populated with a 2.2-µF X5R/X7R capacitor.
  • C20 and C21 must each be populated with a 10-µF X5R/X7R capacitor.

Functionally, the F280049C powers up the 1.2-V power rail using the internal VREG, then requires software to change from the VREG to the DC/DC. See the F28004x Technical Reference Manual for more details.