SLAA419C October   2009  – April 2019 MSP430F5418 , MSP430F5418A , MSP430F5419 , MSP430F5419A , MSP430F5435 , MSP430F5435A , MSP430F5436 , MSP430F5436A , MSP430F5437 , MSP430F5437A , MSP430F5438 , MSP430F5438A

 

  1.   Migrating From MSP430F541x and MSP430F543x MCUs to MSP430F541xA and MSP430F543xA MCUs
    1.     Trademarks
    2. 1 Device Comparison
    3. 2 Hardware Considerations
      1. 2.1 PMM Settings and Low Power Consumption
      2. 2.2 Operating Frequency vs Supply Voltage
      3. 2.3 Internal Voltage Reference
      4. 2.4 Unified Clock System (UCS) Settings
      5. 2.5 Cyclic Redundancy Check Module
      6. 2.6 Device Errata
    4. 3 Firmware Considerations
      1. 3.1 PMM Default States
        1. 3.1.1 PMM Defaults for F543x
          1. 3.1.1.1 Power Management Module Control Register 0 (PMMCTL0)
          2. 3.1.1.2 Supply Voltage Supervisor and Monitor High-Side Control Register (SVSMHCTL)
          3. 3.1.1.3 Supply Voltage Supervisor and Monitor Low-Side Control Register (SVSMLCTL)
          4. 3.1.1.4 Power Management Module Reset and Interrupt Enable Register (PMMRIE)
        2. 3.1.2 PMM Defaults for F543xA
      2. 3.2 Internal Voltage Reference
        1. 3.2.1 ADC12 Temperature Sensor Equation
      3. 3.3 Bootloader (BSL)
    5. 4 References
  2.   Revision History

2.3 Internal Voltage Reference

One significant difference in the architecture of the F543xA MCUs is the replacement of the internal 1.5-V or 2.5-V reference (se the ADC12 block diagram in the MSP430F5xx and MSP430F6xx Family User's Guide) with a separate, general-purpose REF module that can provide voltages to the various analog peripherals on a given F5xx MCU. The implications to the application can be minimal, as the F543xA REF module includes a setting that is backward compatible with the F543x revisions of silicon (see Section 3 for details on enabling this mode). For the purpose of future compatibility, TI recommends using the REF module as a separate module and not in a backward-compatible mode.

At a high level, the improved features that the REF module provides are:

  • Centralized trimmed bandgap with excellent PSRR, temperature coefficient, and initial accuracy
  • 1.5-V, 2.0-V, and 2.5-V user selectable internal references
  • Buffered bandgap voltage available to rest of system
  • Power saving features
  • Backward compatibility to existing reference system

For details on how to use the REF module, see the MSP430F5xx and MSP430F6xx Family User's Guide.