SPRZ292S December   2008  – November 2020 TMS320F28020 , TMS320F280200 , TMS320F28021 , TMS320F28022 , TMS320F28022-Q1 , TMS320F280220 , TMS320F28023 , TMS320F28023-Q1 , TMS320F280230 , TMS320F28026 , TMS320F28026-Q1 , TMS320F28026F , TMS320F28027 , TMS320F28027-Q1 , TMS320F280270 , TMS320F28027F , TMS320F28027F-Q1

 

  1.   TMS320F2802x, TMS320F2802xx MCUs Silicon Revisions B, A, 0
  2. 1Introduction
  3. 2Device and Development Support Tool Nomenclature
  4. 3Device Markings
  5. 4Usage Notes and Known Design Exceptions to Functional Specifications
    1. 4.1 Usage Notes
      1. 4.1.1 PIE: Spurious Nested Interrupt After Back-to-Back PIEACK Write and Manual CPU Interrupt Mask Clear Usage Note
      2. 4.1.2 Flash: MAX "Program Time” and “Erase Time” in Revision O of the TMS320F2802x Microcontrollers Data Manual are only Applicable for Devices Manufactured After October 2020
    2. 4.2 Known Design Exceptions to Functional Specifications
      1.      Advisory to Silicon Variant / Revision Map
      2.      Advisory
      3.      Advisory
      4.      Advisory
      5.      Advisory
      6.      Advisory
      7.      Advisory
      8.      Advisory
      9.      Advisory
      10.      Advisory
      11.      Advisory
      12.      Advisory
      13.      Advisory
      14.      Advisory
      15.      Advisory
      16.      Advisory
      17.      Advisory
      18.      Advisory
      19.      Advisory
      20.      Advisory
      21.      Advisory
      22.      Advisory
  6. 5Documentation Support
  7. 6Trademarks
  8. 7Revision History

Advisory

ADC: Out-of-Specification Current Consumption on Power Up

Revision(s) Affected

0, A, B

Details

When the ADC module is powered up for the first time, it can consume 2x the current listed (IDDA) in the data manual until a sample is initiated.

Workaround(s)

Before the ADC is initially powered up, initiate a single conversion. Once the timing of the conversion has been satisfied, an ADC reset is recommended to restore the native state of the ADC before setting up the ADC as done before this addition. (Code is shown below.) If this amount of current can be tolerated by the system, then no change needs to be made to the setup code. Note that the current will go back to within data manual limits once the first conversion is processed by the ADC.


EALLOW;
SysCtrlRegs.PCLKCR0.bit.ADCENCLK=1;       //Enable Clocks to ADC module
AdcRegs.ADCSOCFRC1.bit.SOC0 = 1;          //Issue dummy conversion
asm(" rpt #19 || nop");                   //Wait for conversion to propagate
AdcRegs.SOCPRICTL.bit.SOCPRIORITY = 1;    //Change Priority Control to reset
AdcRegs.SOCPRICTL.bit.SOCPRIORITY = 0;    //round robin pointer
EDIS;