Texas Instruments MSP430AFE232IPW

Overview

MSP430AFE232IPW from Texas Instruments is an ultra-low-power mixed-signal microcontroller integrating two independent 24-bit sigma-delta ADCs, a 16-bit RISC CPU, 8 KB flash, 512 B RAM, USART (UART/SPI), Timer_A3 with three capture/compare registers, and hardware multiplier. It operates from 1.8 V to 3.6 V and supports single-phase electricity metering with differential PGA inputs and programmable supply monitoring.

For engineers reviewing the MSP430AFE232IPW datasheet, MSP430AFE232IPW pinout, MSP430AFE232IPW application, or MSP430AFE232IPW equivalent, key selection factors include dual 24-bit SD24_A ADC channel count, TSSOP-24 package compatibility, LPM4 current of 0.1 µA at 2.2 V, 12-MHz max system clock, and integrated SVS/SVM for metrology-grade power supervision.

Technical Context

The MSP430AFE232IPW implements a 16-bit RISC architecture with five low-power modes and sub-1-µs wake-up from standby. Its SD24_A module supports differential PGA inputs per ADC channel, external reference input (VREF), and built-in voltage reference with buffer output - all optimized for high-precision analog front-end acquisition in energy measurement systems.

It features a digitally controlled oscillator (DCO) calibrated at factory for 1 MHz and 12 MHz operation, HF crystal support up to 16 MHz via XT2IN/XT2OUT, and dual supply domains (AVCC/AVSS and DVCC/DVSS) with independent brownout detection and supply voltage supervisor/monitor (SVS/SVM) configurable via software.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package, 7.8 mm × 4.4 mm body size, with exposed pad not electrically connected. Pin functions are validated per TI SLAS701B Rev. JUNE 2018, Figure 4-2 and Table 4-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar mixed-signal microcontroller applications.

Compared with MSP430AFE252IPW, the MSP430AFE232IPW trades flash capacity for lower unit cost while retaining identical metrology performance; versus MSP430F232IPW, it delivers integrated 24-bit SD24_A capability essential for Class 0.2 compliance - eliminating external AFE design risk and layout complexity.

Availability

MSP430AFE232IPW is available at Aetrix Electronics and suitable for single-phase electricity metering, digital power monitoring, and industrial energy submetering requiring stable component supply across multi-year production cycles.

Supply support for MSP430AFE232IPW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer applications.

The MSP430AFE2xx product line is designed specifically for ultra-low-power, high-precision analog measurement in utility metering and energy monitoring systems - integrating metrology-grade ADCs, supply supervision, and robust packaging for harsh environments.

FAQ

What is the maximum system clock frequency supported by the MSP430AFE232IPW?

The MSP430AFE232IPW supports a maximum system clock (MCLK) frequency of 12 MHz when operating at VCC ≥ 3.3 V. At 1.8 V, the maximum safe frequency is 4.15 MHz per the recommended operating conditions in SLAS701B. This limit ensures reliable flash execution and peripheral timing margins across temperature and voltage ranges. The DCO is factory-calibrated for both 1 MHz and 12 MHz operation.

How many analog input channels does the MSP430AFE232IPW support, and what is their configuration?

The MSP430AFE232IPW integrates two independent 24-bit sigma-delta ADCs (SD24_A), each with fully differential PGA inputs - supporting four dedicated analog pins: A0.0+, A0.0−, A1.0+, and A1.0−. These channels operate simultaneously with programmable gain and data rate, enabling true concurrent voltage and current sampling required for accurate power calculations in single-phase meters.

Does the MSP430AFE232IPW include hardware support for secure firmware updates?

The MSP430AFE232IPW includes a security fuse and programmable code protection, but no cryptographic acceleration hardware (e.g., AES engine). Secure firmware updates require external implementation using software-based signing/verification and the built-in serial bootloader accessed via UART or Spy-Bi-Wire. TI recommends pairing with external secure elements for production-grade OTA security.

What is the purpose of the VREF pin on the MSP430AFE232IPW, and how is it used in metrology designs?

The VREF pin on the MSP430AFE232IPW serves dual roles: it accepts an external reference voltage (e.g., precision 2.5 V) for SD24_A conversion or outputs the internal bandgap reference (1.2 V) buffered to drive external circuitry. In metrology designs, it commonly supplies mid-supply bias to shunt-based current sensors or sets ADC reference for ratiometric measurements - improving accuracy and reducing component count.

Can the MSP430AFE232IPW operate from a 1.8-V supply while running its ADCs at full 24-bit resolution?

Yes, the MSP430AFE232IPW supports full 24-bit SD24_A operation at 1.8 V supply, provided AVCC is within the specified 2.5 V to 3.6 V range for the SD24_A module (per Section 5.25). Since AVCC is separate from DVCC, designers must regulate AVCC to ≥2.5 V (e.g., 2.5 V or 3.0 V) while DVCC may remain at 1.8 V - enabling ultra-low-power digital operation alongside high-precision analog acquisition.