Texas Instruments MSP430AFE233IPWR

Overview

MSP430AFE233IPWR from Texas Instruments is an ultra-low-power mixed-signal microcontroller integrating three independent 24-bit sigma-delta ADCs, a 16-bit RISC CPU, 8 KB flash, 512 B RAM, and USART with UART/SPI support - designed for high-accuracy energy metering in single-phase electricity meters.

For engineers reviewing the MSP430AFE233IPWR datasheet, MSP430AFE233IPWR pinout, MSP430AFE233IPWR application, or MSP430AFE233IPWR equivalent, key selection criteria include 24-bit ADC resolution with differential PGA inputs, ultra-low active current (220 µA at 1 MHz/2.2 V), LPM4 standby current of 0.1 µA, TSSOP-24 package compatibility, and integrated supply voltage supervisor with programmable level detection.

Technical Context

The MSP430AFE233IPWR implements a 16-bit RISC architecture clocked up to 12 MHz via DCO, HF crystal (≤16 MHz), or VLO oscillator, with five low-power modes enabling sub-1 µs wake-up from standby. Its SD24_A module supports simultaneous 24-bit sigma-delta conversion across three differential analog input channels (A0.0±, A1.0±, A2.0±) with built-in PGA, reference buffer, and temperature sensing.

It integrates Timer_A3 with three capture/compare registers, a 16-bit hardware multiplier, brownout detector, and Spy-Bi-Wire/JTAG debug interface. All I/O pins feature Schmitt-trigger inputs, programmable pullup/pulldown resistors, and operate across 1.8–3.6 V with guaranteed functionality at –40°C to +85°C.

Key Specifications

Pinout & Package

The MSP430AFE233IPWR is housed in a 24-pin TSSOP (PW) package measuring 7.8 mm × 4.4 mm, with exposed pad not present. Pin functions are validated per TI SLAS701B Rev JUNE 2018, Figure 4-1 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 MSP430AFE253IPWR and MSP430AFE223IPWR, the MSP430AFE233IPWR delivers optimal balance of code capacity (8 KB), metrology performance (three 24-bit ADCs), and power efficiency - making it the preferred choice for mid-tier single-phase meters requiring field-upgradable firmware and dual-communication support.

Availability

MSP430AFE233IPWR is available at Aetrix Electronics and suitable for single-phase electricity meters, digital power monitors, and industrial energy loggers requiring stable component supply across multi-year production cycles.

Supply support for MSP430AFE233IPWR 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 with over 50 years of innovation in precision analog and ultra-low-power design.

The MSP430AFE2xx product line targets high-accuracy, battery-operated metering applications - integrating metrology-grade ADCs, low-power MCUs, and system-level features to reduce bill-of-materials and simplify compliance with IEC 62053 standards.

FAQ

What is the maximum system clock frequency supported by the MSP430AFE233IPWR?

The MSP430AFE233IPWR 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 - all specified under recommended operating conditions with 50% ±10% duty cycle. This scaling ensures reliable operation across the full 1.8–3.6 V supply range without derating.

Does the MSP430AFE233IPWR include an internal voltage reference for the SD24_A ADCs?

Yes, the MSP430AFE233IPWR includes an internal 1.2 V bandgap reference usable by the SD24_A ADCs. It can be buffered and output on the VREF pin, or used internally as the ADC reference. External references up to 2.5 V may also be applied to VREF for improved accuracy in precision metering applications.

How many analog input channels does the MSP430AFE233IPWR support for simultaneous sampling?

The MSP430AFE233IPWR supports three independent 24-bit sigma-delta ADC channels (A0.0±, A1.0±, A2.0±), each with dedicated differential inputs and PGA. While conversions are time-multiplexed within the SD24_A module, the device enables synchronized start and phase-aligned sampling across all three channels - critical for vector-based power calculations.

What debug interface does the MSP430AFE233IPWR use, and how many pins are required?

The MSP430AFE233IPWR uses the Spy-Bi-Wire (SBW) interface, which requires only two pins: TEST/SBWTCK (pin 10) and RST/NMI/SBWTDIO (pin 11). This 2-wire interface provides full JTAG-equivalent debug and programming capability while minimizing PCB footprint and connector count compared to standard 4-pin JTAG.

Is the MSP430AFE233IPWR pin-compatible with other devices in the MSP430AFE2xx family?

Yes, the MSP430AFE233IPWR is pin-compatible with all 24-pin TSSOP variants in the MSP430AFE2xx family (e.g., MSP430AFE253IPWR, MSP430AFE223IPWR), sharing identical pinout, package dimensions, and peripheral mapping. Firmware and hardware designs can be scaled across flash/RAM variants without layout changes.