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