MSP430AFE221

ACTIVE

12 MHz metering AFE with 1 24-bit Sigma-Delta ADC, 4KB Flash, 256B RAM

MSP430AFE221

ACTIVE

Product details

CPU MSP430 Frequency (MHz) 12 Flash memory (kByte) 4 RAM (kByte) 0.25 ADC type 16-bit Sigma Delta Features Advanced sensing UART 1 Number of ADC channels 1 SPI 1 USB No Operating temperature range (°C) -40 to 85 Rating Catalog Communication interface SPI, UART Operating system BareMetal (No OS), TI RTOS Hardware accelerators 0 Nonvolatile memory (kByte) 4 Number of GPIOs 11 Number of I2Cs 0 Security Secure debug
CPU MSP430 Frequency (MHz) 12 Flash memory (kByte) 4 RAM (kByte) 0.25 ADC type 16-bit Sigma Delta Features Advanced sensing UART 1 Number of ADC channels 1 SPI 1 USB No Operating temperature range (°C) -40 to 85 Rating Catalog Communication interface SPI, UART Operating system BareMetal (No OS), TI RTOS Hardware accelerators 0 Nonvolatile memory (kByte) 4 Number of GPIOs 11 Number of I2Cs 0 Security Secure debug
TSSOP (PW) 24 49.92 mm² 7.8 x 6.4
  • Low Supply Voltage Range: 1.8 V to 3.6 V
  • Ultra-Low Power Consumption
    • Active Mode: 220 µA at 1 MHz, 2.2 V
    • Standby Mode: 0.5 µA
    • Off Mode (RAM Retention): 0.1 µA
  • Five Power-Saving Modes
  • Ultra-Fast Wake-up From Standby Mode in Less Than 1 µs
  • 16-Bit RISC Architecture, up to 12-MHz System Clock
  • Basic Clock Module Configurations
    • Internal Frequencies up to 12 MHz With Two Calibrated Frequencies
    • Internal Very-Low-Power Low-Frequency (LF) Oscillator
    • High-Frequency (HF) Crystal up to 16 MHz
    • Resonator
    • External Digital Clock Source
  • Up to Three 24-Bit Sigma-Delta Analog-to-Digital Converters (ADCs) With Differential PGA Inputs
  • 16-Bit Timer_A With Three Capture/Compare Registers
  • Serial Communication Interface (USART), Asynchronous UART or Synchronous SPI Selectable by Software
  • 16-Bit Hardware Multiplier
  • Brownout Detector
  • Supply Voltage Supervisor and Monitor With Programmable Level Detection
  • Serial Onboard Programming, No External Programming Voltage Needed Programmable Code Protection by Security Fuse
  • On-Chip Emulation Module
  • Device Comparison Summarizes the Available Family Members
  • For Complete Module Descriptions, See the MSP430x2xx Family User’s Guide
  • Low Supply Voltage Range: 1.8 V to 3.6 V
  • Ultra-Low Power Consumption
    • Active Mode: 220 µA at 1 MHz, 2.2 V
    • Standby Mode: 0.5 µA
    • Off Mode (RAM Retention): 0.1 µA
  • Five Power-Saving Modes
  • Ultra-Fast Wake-up From Standby Mode in Less Than 1 µs
  • 16-Bit RISC Architecture, up to 12-MHz System Clock
  • Basic Clock Module Configurations
    • Internal Frequencies up to 12 MHz With Two Calibrated Frequencies
    • Internal Very-Low-Power Low-Frequency (LF) Oscillator
    • High-Frequency (HF) Crystal up to 16 MHz
    • Resonator
    • External Digital Clock Source
  • Up to Three 24-Bit Sigma-Delta Analog-to-Digital Converters (ADCs) With Differential PGA Inputs
  • 16-Bit Timer_A With Three Capture/Compare Registers
  • Serial Communication Interface (USART), Asynchronous UART or Synchronous SPI Selectable by Software
  • 16-Bit Hardware Multiplier
  • Brownout Detector
  • Supply Voltage Supervisor and Monitor With Programmable Level Detection
  • Serial Onboard Programming, No External Programming Voltage Needed Programmable Code Protection by Security Fuse
  • On-Chip Emulation Module
  • Device Comparison Summarizes the Available Family Members
  • For Complete Module Descriptions, See the MSP430x2xx Family User’s Guide

The TI MSP family of ultra-low-power microcontrollers consists of several devices featuring different sets of peripherals targeted for various applications. The architecture, combined with five low-power modes, is optimized to achieve extended battery life in portable measurement applications. The device features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency. The digitally controlled oscillator (DCO) allows the device to wake up from low-power modes to active mode in less than 1 µs.

The MSP430AFE2x3 devices are ultra-low-power mixed signal microcontrollers integrating three independent 24-bit sigma-delta ADCs, one 16-bit timer, one 16-bit hardware multiplier, USART communication interface, watchdog timer, and 11 I/O pins.

The MSP430AFE2x2 devices are identical to the MSP430AFE2x3, except that there are only two 24-bit sigma-delta ADCs integrated.

The MSP430AFE2x1 devices are identical to the MSP430AFE2x3, except that there is only one 24-bit sigma-delta ADC integrated.

The TI MSP family of ultra-low-power microcontrollers consists of several devices featuring different sets of peripherals targeted for various applications. The architecture, combined with five low-power modes, is optimized to achieve extended battery life in portable measurement applications. The device features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency. The digitally controlled oscillator (DCO) allows the device to wake up from low-power modes to active mode in less than 1 µs.

The MSP430AFE2x3 devices are ultra-low-power mixed signal microcontrollers integrating three independent 24-bit sigma-delta ADCs, one 16-bit timer, one 16-bit hardware multiplier, USART communication interface, watchdog timer, and 11 I/O pins.

The MSP430AFE2x2 devices are identical to the MSP430AFE2x3, except that there are only two 24-bit sigma-delta ADCs integrated.

The MSP430AFE2x1 devices are identical to the MSP430AFE2x3, except that there is only one 24-bit sigma-delta ADC integrated.

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Technical documentation

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* Data sheet MSP430AFE2x3, MSP430AFE2x2, MSP430AFE2x1 Mixed-Signal Microcontrollers datasheet (Rev. B) PDF | HTML 11 Jun 2018
* Errata MSP430AFE221 Microcontroller Errata (Rev. I) PDF | HTML 17 Jun 2021
* User guide MSP430F2xx, MSP430G2xx Family User's Guide (Rev. K) PDF | HTML 25 Aug 2022
Application note Migration Guide From MSP430 MCUs to MSPM0 MCUs (Rev. B) PDF | HTML 02 Jun 2025
Application note Implementation of a Single-Phase Electronic Watt-Hour Meter Using MSP430AFE2xx (Rev. B) PDF | HTML 17 Aug 2023
Application note Design Considerations When Using the MSP430 Graphics Library (Rev. A) PDF | HTML 09 Aug 2023
Application brief Add Housekeeping Functions to Your MSP430™ MCU: Power Sequencer PDF | HTML 07 Sep 2021
Application note ESD Diode Current Specification (Rev. B) PDF | HTML 23 Aug 2021
User guide MSP430 MCUs Development Guide Book (Rev. A) PDF | HTML 13 May 2021
Application note Answers to Common Sigma-Delta ADC Questions on MSP MCUs PDF | HTML 11 Aug 2020
Application note MSP430 System ESD Troubleshooting Guide PDF | HTML 13 Dec 2019
Application note Migrating from the MSP430F2xx,G2xx Family to the MSP430FR58xx/FR59xx/68xx/69xx (Rev. E) PDF | HTML 03 Nov 2016
Application note MSP Code Protection Features PDF | HTML 07 Dec 2015
Application note Interfacing the MSP430AFE2xx Based Single-Phase E-Meter with a Host Processor 24 Sep 2014
Application note Programming With the MSP430AFE2xx Family and the MSP430i20xx Family 10 Aug 2014
Application note Design Considerations When Using the MSP430 Graphics Library 05 Oct 2012
Application note Energy Measurement Results for TI Designed Meter Using MSP430AFE2xx Devices 30 Jul 2012
White paper Sub-Metering Made Easy Using Texas Instruments Energy Measurement ICs 22 May 2012
White paper Power Management Solutions for Ultra-Low-Power 16-Bit MSP430 MCUs (Rev. D) 28 Mar 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

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Not available on TI.com
Hardware programming tool

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Software development kit (SDK)

MSP430-SDK MSP430-SDK for MSP430 Microcontrollers

MSP430-SDK is a collection of resources that help users to write effective code for MSP430 microcontrollers (MCUs). These resources support ALL MSP430 microcontrollers. As one user mentioned, “It’s essentially everything developers need to become MSP430 microcontroller experts!”

This collection of (...)

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Code example or demo

SLAC487 MSP430AFE2x3, MSP430AFE2x2, MSP430AFE2x1 Code Examples

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Driver or library

MSP-DSPLIB Digital Signal Processing (DSP) Library for MSP Microcontrollers

The TI MSP430™ Digital Signal Processing library is a set of optimized functions to perform common signal processing operations for MSP430 microcontrollers. These functions are used in applications where processing-intensive transforms are done in real-time for minimal energy and with very (...)

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Driver or library

MSP-GRLIB MSP Graphics Library

The MSP Graphics Library is a royalty-free set of graphics primitives for displaying images or creating graphical user interfaces (GUIs) on MSP430 and MSP432 microcontroller-based boards that use a graphical display. The graphics library consists of two functional layers: 1) the display driver (...)

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Getting started

TI-DEVELOPER-ZONE Start embedded development on your desktop or in the cloud

From evaluation to deployment the TI Developer Zone provides a comprehensive range of software, tools and training to ensure that you have everything you need for each stage of the development process.
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IDE, configuration, compiler or debugger

CCSTUDIO Code Composer Studio™ integrated development environment (IDE)

Code Composer Studio is an integrated development environment (IDE) for TI's microcontrollers and processors. It is comprised of a rich suite of tools used to build, debug, analyze and optimize embedded applications. Code Composer Studio is available across Windows®, Linux® and macOS® platforms.

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IDE, configuration, compiler or debugger

ENERGYTRACE — EnergyTrace Technology

EnergyTrace™ software for MSP430™ MCUs, MSP432™ MCUs, CC13xx wireless MCUs and CC26xx wireless MCUs is an energy-based code analysis tool that measures and displays the energy profile of an application and helps optimize it for ultra-low-power consumption.

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IDE, configuration, compiler or debugger

IAR-KICKSTART — IAR Embedded Workbench

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Online training

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MSP430™ academy delivers easy-to-use training modules that span a wide range of topics and LaunchPads in the MSP430 MCU portfolio.
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Operating system (OS)

WHIS-3P-SAFERTOS — WITTENSTEIN SAFERTOS Pre-certified safety RTOS

SAFERTOS® is a unique real time operating system designed for embedded processors. It is precertified to IEC 61508 SIL3 and ISO 26262 ASILD standards by TÜV SÜD. SAFERTOS® was crafted specifically for safety by WHIS' team of experts and is used globally in safety critical applications. WHIS and (...)
Software programming tool

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MSPFlasher is an open-source, shell-based (command line) interface for programming MSP430™ and MSP432™ microcontrollers (MCUs) through JTAG and provides the most common programming functions. MSP Flasher can be used to download binary files directly to memory without the need of an IDE (...)

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Software programming tool

UNIFLASH UniFlash for most TI microcontrollers (MCUs) and mmWave sensors

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Design tool

MSP-3P-SEARCH — MSP Third party search tool

TI has partnered with multiple companies to offer a wide range of solutions and services for TI MSP devices. These companies can accelerate your path to production using MSP devices. Download this search tool to quickly browse third-party details and find the right third-party to meet your needs.

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Package Pins CAD symbols, footprints & 3D models
TSSOP (PW) 24 Ultra Librarian

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