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SPRZ423K October 2014 – May 2024 TMS320F28075 , TMS320F28075-Q1 , TMS320F28076

1
Abstract
1Usage Notes and Advisories Matrices
1. 1.1 Usage Notes Matrix
2. 1.2 Advisories Matrix
2Nomenclature, Package Symbolization, and Revision Identification
3Silicon Revision C Usage Notes and Advisories
1. 3.1 Silicon Revision C Usage Notes
2. 3.2 Silicon Revision C Advisories
  1. Advisory
  2. Advisory
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  30. Advisory
  31. Advisory
  32. Advisory
  33. Advisory
  34. Advisory
  35. Advisory
  36. Advisory
4Silicon Revision B Usage Notes and Advisories
1. 4.1 Silicon Revision B Usage Notes
2. 4.2 Silicon Revision B Advisories
  1. Advisory
  2. Advisory
  3. Advisory
  4. Advisory
  5. Advisory
  6. Advisory
  7. Advisory
  8. Advisory
  9. Advisory
5Documentation Support
6Trademarks
7Revision History

Advisory

Analog Bandgap References

Revisions Affected

B, C

Details

The Analog Subsystem includes internal bandgap reference circuits that are shared by the embedded analog modules. Table 3-1 shows the bandgap usage by module.

Table 3-1 Bandgap Usage by Module

BANDGAP	ADC	BUFFERED DAC	CMPSS
BGA	ADCA	DACA DACB	CMPSS1 CMPSS2
BGB	ADCB	DACC	CMPSS3 CMPSS4
BGC	ADCC		CMPSS5 CMPSS6
BGD	ADCD		CMPSS7 CMPSS8

Each bandgap reference—BGA, BGB, BGC, or BGD—will power up when one or more of the dependent modules are enabled. An active bandgap reference will power down if all dependent modules are disabled.

For example, bandgap B (BGB) is powered down unless one or more of the following register bits are set:

AdcbRegs.ADCCTL1.bit.ADCPWDNZ
DaccRegs.DACOUTEN.bit.DACOUTEN
Cmpss3Regs.COMPCTL.bit.COMPDACE
Cmpss4Regs.COMPCTL.bit.COMPDACE

The CMPSS and GPDAC power-up time specification in the TMS320F2807x Real-Time Microcontrollers data sheet previously did not account for the bandgap power-up time. This 10-µs value has been increased to 500 µs to account for the bandgap power-up time.

Workarounds

If your application was utilizing a power-up time of 10 µs for the CMPSS and GPDAC, you do not need to increase it to 500 µs if the respective ADC on that bandgap was turned on before the CMPSS and GPDAC, and the ADC power-up time of 500 µs was adhered to.

For simplicity, it is recommended that 500 µs be used as the power-up time for both CMPSS and GPDAC.