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

4.1 Internal Oscillators

Internal Low-Frequency Oscillator (LFOSC)

LFOSC is an on-chip low power oscillator that is factory trimmed to a frequency of 32.768 kHz. It provides a low-frequency clock that can be used to help the system achieve low-power. LFOSC can provide higher accuracy when used over a reduced temperature range. See the device-specific data sheet for details.

GUID-6F9FAF5C-CAE2-45EB-B121-3EF60842C773-low.png Figure 4-1 MSPM0L Series LFOSC

Internal System Oscillator (SYSOSC)

SYSOSC is an on-chip, accurate, and configurable oscillator with factory-trimmed frequencies of 32 MHz (base frequency) and 4 MHz (low frequency), as well as support for user-trimmed operation at either 24 MHz or 16 MHz. It provides a high-frequency clock that lets the CPU run at high speed for executing code and processing performance.

GUID-7C3445B4-3C5F-44E2-BD56-9182C3C24C8D-low.png Figure 4-2 MSPM0L Series SYSOSC

SYSOSC Frequency Correction Loop

The additional hardware setting for this oscillator is an external resistor, populated between the ROSC pin and VSS, to increase SYSOSC from a base accuracy of ±2.5% across temperature.

The overall SYSOSC application accuracy is determined by combining the following error sources to determine the total error:

  1. The ROSC reference resistor error (due to tolerance and temperature drift)
  2. The SYSOSC circuit error in FCL mode (±0.75% for -40°C to 85°C or ±0.90% for -40°C to 125°C)

#GUID-A8A7C48C-A7E1-460B-9687-642B5C2DEB96/GUID-F6EEBED2-F653-4C16-A93E-B1BFC9DF65CB shows how to calculate the SYSOSC application accuracy for two different ROSC resistor specs across two temperature ranges. For more details, refer to the MSPM0 L-Series 32-MHz Microcontrollers Technical Reference Manual.

Table 4-1 SYSOSC Accuracy With FCL, by ROSC Tolerance, RSOC TCR, and Ambient Temperature (TA)
Ambient Temperature (TA) -40 ≤ TA ≤ 125°C -40 ≤ TA ≤ 85°C
ROSC Resistor Parameters ±0.1% 25 ppm/°C ±0.5% 25 ppm/°C ±0.1% 25 ppm/°C ±0.5% 25 ppm/°C
Nominal ROSC resistance (ROSCnom) 100 kΩ
Maximum ROSC resistance (at 25°C) 100.1 kΩ 100.5 kΩ 100.1 kΩ 100.5 kΩ
Minimum ROSC resistance (at 25°C) 99.9 kΩ 99.5 kΩ 99.9 kΩ 99.5 kΩ
ROSC resistor TCR 25 ppm/°C
ROSC temperature drift -0.16% to 0.25% -0.16% to 0.15%
Maximum ROSC resistance (at high temperature) (ROSCmax) 100.35 kΩ 100.75 kΩ 100.25 kΩ 100.65 kΩ
Minimum ROSC resistance (at low temperature) (ROSCmin) 99.74 kΩ 99.34 kΩ 99.74 kΩ 99.34 kΩ
ROSC resistance error (high temperature) (ROSCerr+) +0.35% +0.75% + 0.25% +0.65%
ROSC resistance error (low temperature) (ROSCerr-) -0.26% -0.66% -0.26% -0.66%
SYSOSC circuit error (SYSOSCerr) ±0.9% ±0.75%
Total accuracy (TOTerr-, TOTerr+) -1.2% to +1.3% -1.6% to +1.7% -1.0% to +1.0% -1.4% to +1.4%