SLAAE75A November   2022  – March 2023 MSPM0L1105 , MSPM0L1106 , MSPM0L1227 , MSPM0L1228 , MSPM0L1228-Q1 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346 , MSPM0L2227 , MSPM0L2228 , MSPM0L2228-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1 MSPM0L Hardware Design Check List
  4. 2 Power Supplies in MSPM0L 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. 3 Reset and Power Supply Supervisor
    1. 3.1 Digital Power Supply
    2. 3.2 Power Supply Supervisor
  6. 4 Clock System
    1. 4.1 Internal Oscillators
    2. 4.2 External Clock Output (CLK_OUT)
    3. 4.3 Frequency Clock Counter (FCC)
  7. 5 Debugger
    1. 5.1 Debug Port Pins and Pinout
    2. 5.2 Debug Port Connection With Standard JTAG Connector
  8. 6 Key Analog Peripherals
    1. 6.1 ADC Design Considerations
    2. 6.2 OPA Design Considerations
    3. 6.3 DAC Design Considerations
    4. 6.4 COMP Design Considerations
    5. 6.5 GPAMP Design Considerations
  9. 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 I2C and SPI Design Considerations
  10. 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
    4. 8.4 Open-Drain GPIOs Enable 5-V Communication Without a Level Shifter
    5. 8.5 Communicate With 1.8-V Devices Without a Level Shifter
    6. 8.6 Unused Pins Connection
  11. 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
  12. 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
  13. 11References
  14. 12Revision History

2.2 Analog Power Supply

Analog Mux VBOOST

The VBOOST circuit in the PMU generates an internal VBOOST supply which is used by the analog muxes in COMP, GPAMP, and OPA, if present on a device. The VBOOST circuit enables consistent analog mux performance across the external supply voltage (VDD) range.

Enabling and Disabling VBOOST

SYSCTL automatically manages the enable request for the VBOOST circuit based on the following parameters:

  1. The COMP, OPA, and GPAMP peripheral PWREN settings
  2. The MODE setting of any COMP which is enabled (FAST vs. ULP mode).
  3. The ANACPUMPCFG control bits in the GENCLKCFG register in SYSCTL.

VBOOST is disabled by default following a SYSRST. It is not necessary for application software to enable the VBOOST circuit before using the COMP, OPA, or GPAMP. When a COMP, OPA, or the GPAMP is enabled by application software, SYSCTL will also enable the VBOOST circuit to support the analog peripheral.

The VBOOST circuit has a startup time requirement (12 µs typical) to transition from a disabled state to an enabled state. In the event that the startup time of the COMP, OPA, or GPAMP is less than the VBOOST startup time, the peripheral startup time is extended to account for the VBOOST startup time.

Bandgap Reference

The PMU provides a temperature and supply voltage stable bandgap voltage reference which is used by the device for internal functions, including:

  • Driving the brownout reset circuit thresholds.
  • Setting the output voltage for the core regulator.
  • Driving the on-chip VREF levels for on-chip analog peripherals.

The bandgap reference is enabled in RUN, SLEEP, and STOP modes. It operates in a sampled mode in STANDBY to reduce power consumption. It is disabled in SHUTDOWN mode. SYSCTL manages the bandgap state automatically; no user configuration is required.