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

1 Split-Supply I/O Systems

For split-supply I/O systems, the split supplies are connected to the VCC (DVCC and AVCC) and DVIO pins. Supply voltage at DVCC and AVCC pins (VCC) is used to provide device power, and the supply voltage at the DVIO pin (VIO) is used to supply the I/O rail of the "DVIO supplied I/O pins". The recommended VCC supply voltage ranges from 1.8 V to 3.6 V (see note A on Figure 1) and, therefore, these devices do not operate at nominal 1.8 V (that is, 1.8 V ± 10%) supply voltage level. The VIO supply voltage ranges from 1.62 V to VCC and is useful in applications that interface with nominal 1.8-V I/O interface (that is, 1.8 V ± 10%).

split_supply_io_systems_slaa558.gif
A. The recommended VCC supply voltage range of 1.8 V to 3.6 V is applicable to the VCORE setting of PMMCOREVx = 0. See the device data sheet for the VCC supply voltage ranges at different VCORE settings.
B. It is recommended to power AVCC and DVCC from the same source. A maximum difference of 0.3 V between AVCC and DVCC can be tolerated during power-up and operation.
C. See the MSP430F522x, MSP430F521x Mixed-Signal Microcontrollers data sheet for the VIO supply voltage range.
Figure 1. Split Supply I/O Systems