SDAA132 December   2025 MSPM33C321A

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 MSPM33C Hardware Design Check List
  5. 2 Power Supplies in MSPM33C Devices
    1. 2.1 Digital Power Supply
    2. 2.2 Analog Power Supply
    3. 2.3 Built-in Power Supply and Voltage Reference
    4. 2.4 Recommended Decoupling Circuit for Power Supply
    5. 2.5 Recommended Decoupling Circuit for VBAT
  6. 3 Reset and Power Supply Supervisor
    1. 3.1 Digital Power Supply
    2. 3.2 Power Supply Supervisor
  7. 4 Clock System
    1. 4.1 Internal Oscillators
    2. 4.2 External Oscillators
    3. 4.3 External Clock Output (CLK_OUT)
    4. 4.4 Frequency Clock Counter (FCC)
  8. 5 Debugger
    1. 5.1 Debug Port Pins and Pinout
    2. 5.2 Debug Port Connection With Standard JTAG Connector
  9. 6 Key Analog Peripherals
    1. 6.1 ADC Design Considerations
    2. 6.2 COMP Design Considerations
  10. 7 Key Digital Peripherals
    1. 7.1 Timer Resources and Design Considerations
    2. 7.2 UART and LIN Resources and Design Considerations
    3. 7.3 MCAN Design Considerations
    4. 7.4 I2C and SPI Design Considerations
    5. 7.5 I2S/TDM Design Considerations
    6. 7.6 QSPI Design Considerations
  11. 8 GPIOs
    1. 8.1 GPIO Output Switching Speed and Load Capacitance
    2. 8.2 GPIO Current Sink and Source
    3. 8.3 High-Speed GPIOs (HSIO)
    4. 8.4 High-Drive GPIOs (HDIO)
    5. 8.5 Communicate With a 1.8V Device Without a Level Shifter
    6. 8.6 Unused Pins Connection
  12. 9 Layout Guides
    1. 9.1 Power Supply Layout
    2. 9.2 Considerations for Ground Layout
    3. 9.3 Traces, Vias, and Other PCB Components
    4. 9.4 How to Select Board Layers and Recommended Stack-up
  13. 10Bootloader
    1. 10.1 Bootloader Introduction
    2. 10.2 Bootloader Hardware Design Considerations
      1. 10.2.1 Physical Communication interfaces
      2. 10.2.2 Hardware Invocation
  14. 11Summary
  15. 12References

8.1 GPIO Output Switching Speed and Load Capacitance

When using the GPIO as I/O, design considerations must be made to verify correct operation. As load capacitance becomes larger, the rise and fall time of the I/O pin increases. This capacitance includes pin parasitic capacitance (Ci = 5pF (typical)) and the effects of the board traces. I/O characteristics are available in the device-specific data sheet. Table 8-1 lists the I/O output frequency characteristics of the MSPM33C device.

Table 8-1 MSPM33C GPIO Switching Characteristics
PARAMETERTEST CONDITIONSMINTYPMAXUNIT
fmax Port output frequency SDIO VDD ≥ 1.71V, CL = 20pF 16 MHz
VDD ≥ 2.7V, CL = 20pF 32
HSIO VDD ≥ 1.71V, DRV = 0, CL = 20pF 16
VDD ≥ 1.71V, DRV = 1, CL = 20pF 24
VDD ≥ 2.7V, DRV = 0, CL = 20pF 32
VDD ≥ 2.7V, DRV = 1, CL = 20pF 40
HDIOVDD ≥ 1.71V, DRV = 0, CL = 20pF16
VDD ≥ 2.7V, DRV = 0, CL = 20pF20
Note:
  • The output voltage reaches at least 10% and 90% VDD at the specified toggle frequency.