SLAA890A December   2019  – August 2021 MSP430FR2000 , MSP430FR2032 , MSP430FR2033 , MSP430FR2100 , MSP430FR2110 , MSP430FR2111 , MSP430FR2153 , MSP430FR2155 , MSP430FR2310 , MSP430FR2311 , MSP430FR2353 , MSP430FR2355 , MSP430FR2422 , MSP430FR2433 , MSP430FR2475 , MSP430FR2476 , MSP430FR2512 , MSP430FR2522 , MSP430FR2532 , MSP430FR2533 , MSP430FR2632 , MSP430FR2633 , MSP430FR2672 , MSP430FR2673 , MSP430FR2675 , MSP430FR2676 , MSP430FR4131 , MSP430FR4132 , MSP430FR4133

 

  1.   Trademarks
  2. 1Overview of the MSP430FR4xx and MSP430FR2xx ADC Module
  3. 2Comparison Between the FR2xx/FR4xx ADC and ADC12_B
    1. 2.1 Outline of ADC12_B
    2. 2.2 Outline of FR2xx/FR4xx ADC
    3. 2.3 FR2xx/FR4xx ADC Pin Selection and Board Design
    4. 2.4 Key Parameters Comparison
  4. 3Tailoring the ADC and Reference Voltages to Your Application
    1. 3.1 Reference Voltages
    2. 3.2 Internal and External Reference Voltage
    3. 3.3 Signal Resolution
    4. 3.4 Selecting the Right Sampling and Conversion Time to Achieve the Target Conversion Rate
    5. 3.5 Clock Selection
  5. 4Using the Window Comparator to Monitor a Signal Without CPU Intervention
  6. 5Calibration of VREF and the Internal Temperature Sensor to Improve Performance
  7. 6FR2xx/FR4xx ADC Example Code and Resources
  8. 7References
  9. 8Revision History

1 Overview of the MSP430FR4xx and MSP430FR2xx ADC Module

The ADC module of the MSP430FR4xx and MSP430FR2xx microcontrollers (MCUs) supports fast 10-bit or 12-bit analog-to-digital conversions. Depending on the device (see the device-specific data sheet for details), the module implements a 10-bit or 12-bit SAR core together with sample select control and a window comparator. The ADC IP described here is called the FR2xx/FR4xx ADC to distinguish it from the ADC12_B module that is used in the MSP430FR58xx, MSP430FR59xx, and MSP430FR6xx devices.

FR2xx/FR4xx ADC features include:

  • Greater than 200-ksps maximum conversion rate
  • Monotonic 10-bit or 12-bit converter with no missing codes
  • Sample-and-hold with programmable sampling periods controlled by software or timers
  • Conversion initiation by software or different timers
  • Software-selectable on-chip reference or external reference
  • Twelve individually configurable external input channels
  • Conversion channel for on-chip temperature sensor
  • Selectable conversion clock source
  • Single-channel, repeat-single-channel, sequence, and repeat-sequence conversion modes
  • Window comparator for low-power monitoring of input signals
  • Interrupt vector register for fast decoding of six ADC interrupts