SLAAE72 December   2022 MSPM0L1105 , MSPM0L1106 , MSPM0L1303 , MSPM0L1304 , MSPM0L1304-Q1 , MSPM0L1305 , MSPM0L1305-Q1 , MSPM0L1306 , MSPM0L1306-Q1 , MSPM0L1343 , MSPM0L1344 , MSPM0L1345 , MSPM0L1346

 

  1.   Abstract
  2.   Trademarks
  3. 1Overview
  4. 2Low-Power Features in PMCU
    1. 2.1 Overview
      1. 2.1.1 Power Domains and Power Modes
    2. 2.2 Power Management (PMU)
      1. 2.2.1 Supply Supervisors
      2. 2.2.2 Peripheral Power Control
      3. 2.2.3 VBOOST for Analog Muxes
    3. 2.3 Clock Module (CKM)
      1. 2.3.1 Oscillators
      2. 2.3.2 Clocks
      3. 2.3.3 Asynchronous Fast Clock Requests
      4. 2.3.4 Shutdown Mode Handling
  5. 3Low-Power Optimization
    1. 3.1 Low-Power Basics
    2. 3.2 MSPM0 Low-Power Feature Use
      1. 3.2.1 Low-Power Modes
      2. 3.2.2 System Clock and Peripheral Operation Frequency
      3. 3.2.3 I/O Configuration
      4. 3.2.4 Event Manager
      5. 3.2.5 Analog Peripheral Low-Power Features
      6. 3.2.6 Run Code From RAM
    3. 3.3 Software Coding Strategies
    4. 3.4 Hardware Design Strategies
  6. 4Power Consumption Measurement and Evaluation
    1. 4.1 Current Evaluation
    2. 4.2 Current Measurement
      1. 4.2.1 Current Measurement

2.2.3 VBOOST for Analog Muxes

The VBOOST circuit in the PMU generates an internal VBOOST supply that is used by the analog peripherals. It is automatically managed by SYSCTL module as well.

As the VBOOST circuit has a startup time requirement (12 μs typical), users need to choose between analog peripherals’ power-on speed and low static current. Table 2-2 gives the behavior of the VBOOST control.

Table 2-2 VBOOST Control
Mode VBOOST Enable
ONDEMAND VBOOST is automatically enabled by SYSCTL only when a COMP, OPA, or the GPAMP is enabled.
ONACTIVE VBOOST is forced to be enabled when the device is in RUN or SLEEP mode. VBOOST is also kept enabled in STOP or STANDBY mode if a COMP, OPA, or the GPAMP is enabled.
ONALWAYS VBOOST is forced to be enabled in all operating modes except SHUTDOWN.

The VBOOST circuit requires a functional clock to operate, which can be the SYSOSC (4 MHz output) or the LFCLK (32 kHz) based on the currently active MCLK/ULPCLK tree source, which is selected automatically by SYSCTL. However, certain VBOOST operating conditions require it to be 4 MHz (sourced from SYSOSC) and not 32 kHz (sourced from LFCLK). Such conditions include:

  1. OPA operation or fast mode COMP operation
  2. VBOOST is starting up (transitioning from disabled to enabled)