SLAA558A November   2012  – October 2018 MSP430F5212 , MSP430F5214 , MSP430F5217 , MSP430F5219 , MSP430F5222 , MSP430F5224 , MSP430F5229 , MSP430F5252 , MSP430F5253 , MSP430F5254 , MSP430F5255 , MSP430F5256 , MSP430F5257 , MSP430F5258 , MSP430F5259


  1.   Designing With MSP430F522x and MSP430F521x Devices
    1.     Trademarks
    2. 1 Split-Supply I/O Systems
    3. 2 DVIO Supplied I/Os
    4. 3 Secondary Digital Functions on DVIO Supplied I/Os
    5. 4 Split-Supply Power-Up or Power-Down Sequence
    6. 5 Reset and NMI Pin Functionality
    7. 6 XT1 and XT2 Oscillators in Bypass Mode
    8. 7 Bootloader (BSL)
      1. 7.1 BSL Entry Sequence for DVIO Supplied BSL Interface
      2. 7.2 BSL Exit Sequence for DVIO Supplied BSL Interface
    9. 8 Debugger Connections
      1. 8.1 JTAG Standard Interface
      2. 8.2 Spy-Bi-Wire Interface
      3. 8.3 Debugging Without DVIO
    10. 9 References
  2.   Revision History

Designing With MSP430F522x and MSP430F521x Devices

The MSP430F522x and MSP430F521x devices support a split supply I/O system that is essential in systems in which the MCU is required to interface with external devices (such as sensors or other processors) that operate at different voltage level compared to the MCU device supply. Additionally, the split supply input voltage range of the F522x and F521x devices starts as low as 1.62 V (see the device data sheet specifications), and this allows for nominal 1.8-V I/O interface without the need for external level translation. This application report describes the various design considerations to keep in mind while designing the F522x and F521x devices in an application.

The application report discusses the new features of F522x and F521x devices, which mainly include the split-supply I/O system and the various digital functions supplied from the split-supply I/O rail.