Texas Instruments MSP430AFE232IPWR

Overview

MSP430AFE232IPWR 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 and digital power monitoring applications.

For engineers reviewing the MSP430AFE232IPWR datasheet, MSP430AFE232IPWR pinout, MSP430AFE232IPWR application, or MSP430AFE232IPWR equivalent, key selection criteria include dual 24-bit SD24_A ADC channel count, TSSOP-24 package compatibility, LPM4 current of 0.1 µA, 12-MHz max system clock, and integrated supply voltage supervisor with programmable level detection.

Technical Context

The MSP430AFE232IPWR 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, external reference input, built-in voltage reference, and temperature sensing - all optimized for metrology-grade analog front-end precision.

It features a digitally controlled oscillator (DCO) with two calibrated frequencies, HF crystal support up to 16 MHz, internal VLO, and configurable clock routing to MCLK, SMCLK, and ACLK. The device uses Spy-Bi-Wire for on-chip emulation and programming without external voltage.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (PW), 7.8 mm × 4.4 mm body size, lead pitch 0.65 mm. Designed for surface-mount assembly in space-constrained metering PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430AFE232IPWR, MSP430AFE233IPWR offers higher integration for advanced metrology, while MSP430AFE222IPWR trades memory resources for lower BOM cost - both retain identical ADC performance, power profile, and TSSOP-24 footprint.

Availability

MSP430AFE232IPWR is available at Aetrix Electronics and suitable for single-phase electricity metering, digital power monitoring, and low-power sensor signal conditioning requiring stable component supply across long-lifecycle industrial programs.

Supply support for MSP430AFE232IPWR 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 leader specializing in analog, embedded processing, and connectivity technologies for industrial, automotive, and consumer applications.

The MSP430AFE2xx product line is designed specifically for high-precision, ultra-low-power metrology applications - integrating sigma-delta ADCs, metrology-grade references, and low-power MCUs in a single chip for electricity meters and power analyzers.

FAQ

What is the maximum system clock frequency supported by the MSP430AFE232IPWR?

The MSP430AFE232IPWR supports a maximum system clock (MCLK) frequency of 12 MHz when powered at ≥3.3 V. At 2.7 V, the maximum is 9 MHz, and at 1.8 V it is 4.15 MHz. This frequency scaling ensures stable operation across its 1.8 V to 3.6 V supply range while maintaining timing integrity for ADC sampling and communication peripherals. The DCO is factory-calibrated at two frequencies to enable accurate clock generation without external components.

How many analog input channels does the MSP430AFE232IPWR support?

The MSP430AFE232IPWR integrates two independent 24-bit sigma-delta ADCs (SD24_A), each with differential PGA inputs - supporting two fully isolated analog measurement channels (A0.0± and A1.0±). Unlike the MSP430AFE233IPWR variant, it does not include the third channel (A2.0±). Each channel supports programmable gain, external reference input, and built-in temperature sensing - making it ideal for dual-parameter metering such as voltage + current acquisition.

Does the MSP430AFE232IPWR include a hardware multiplier?

Yes, the MSP430AFE232IPWR includes a 16-bit hardware multiplier (MPY, MPYS, MAC, MACS) capable of signed/unsigned multiply and multiply-accumulate operations. This peripheral significantly accelerates computationally intensive metrology functions such as RMS calculation, harmonic analysis, and energy accumulation - reducing CPU load and enabling deterministic real-time performance without external co-processors.

What debug interface does the MSP430AFE232IPWR use?

The MSP430AFE232IPWR uses the Spy-Bi-Wire (SBW) interface via pins TEST/SBWTCK (Pin 10) and RST/NMI/SBWTDIO (Pin 11) for programming and debugging. This two-wire interface replaces full JTAG, minimizing PCB footprint and connector requirements while supporting flash programming, breakpoint setting, and real-time register inspection. No external programming voltage is needed - all operations run from the core supply rail.

What is the standby current consumption of the MSP430AFE232IPWR in LPM4 mode?

The MSP430AFE232IPWR consumes 0.1 µA typical current in LPM4 mode (RAM retention, clocks disabled) at 2.2 V and 25°C, with a maximum of 0.7 µA at 85°C. This ultra-low quiescent current enables decade-long battery operation in tamper-detection circuits and real-time clock subsystems - a key requirement for ANSI C12.1 and IEC 62053-compliant electricity meters.