Texas Instruments MSP430AFE233IPW

Overview

MSP430AFE233IPW 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 (UART/SPI) in a 24-pin TSSOP package. It operates from 1.8 V to 3.6 V, achieves 220 µA active current at 1 MHz/2.2 V, and supports single-phase electricity metering with differential PGA inputs and built-in voltage reference.

For engineers reviewing the MSP430AFE233IPW datasheet, MSP430AFE233IPW pinout, MSP430AFE233IPW application, or MSP430AFE233IPW equivalent, key selection criteria include its triple 24-bit SD24_A ADC architecture, LPM4 current of 0.1 µA, 11 I/O pins with analog input pairing, and TSSOP-24 packaging for compact energy meter designs.

Technical Context

The MSP430AFE233IPW implements a 16-bit RISC CPU with constant generators and digitally controlled oscillator (DCO), enabling sub-1 µs wake-up from standby mode. Its clock system supports HF crystal (up to 16 MHz), internal VLO, and DCO with two calibrated frequencies - all configurable via software.

Three independent SD24_A converters provide differential PGA inputs with programmable gain, external reference support, and bit-stream outputs routed to P1.2–P1.4. The device includes Timer_A3 with three capture/compare registers, hardware multiplier, brownout detector, and supply voltage supervisor with programmable level detection.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (PW), body size 7.8 mm × 4.4 mm, JEDEC MO-153 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430AFE253IPW and MSP430AFE223IPW, the MSP430AFE233IPW provides optimal balance of memory headroom (8 KB flash), ultra-low-power operation (0.1 µA LPM4), and full triple-ADC functionality - making it the preferred choice for mid-tier single-phase meters requiring field-upgradability and long battery life.

Availability

MSP430AFE233IPW is available at Aetrix Electronics and suitable for single-phase electricity meters, digital power monitors, and smart grid sensor nodes requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MSP430AFE233IPW 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 with over 50 years of leadership in low-power design.

The MSP430AFE2xx product line is engineered specifically for precision metrology applications, integrating high-resolution sigma-delta ADCs, ultra-low-power operation, and metrology-grade references to simplify electricity meter development.

FAQ

What is the maximum system clock frequency supported by the MSP430AFE233IPW?

The MSP430AFE233IPW supports a maximum MCLK frequency of 12 MHz when VCC ≥ 3.3 V and duty cycle is 50% ±10%. At lower supply voltages, the maximum frequency is reduced: 9 MHz at 2.7 V and 4.15 MHz at 1.8 V. This specification ensures reliable timing for metrology calculations and ADC sampling synchronization in the MSP430AFE233IPW.

Does the MSP430AFE233IPW include an internal voltage reference for the ADCs?

Yes, the MSP430AFE233IPW integrates a 1.2 V bandgap voltage reference with ±1% accuracy over temperature, usable as the SD24_A reference source. It also supports external reference input via the VREF pin (2.5 V to 3.6 V), enabling higher precision when paired with a dedicated reference IC. This dual-reference capability is confirmed in Section 5.29 of the MSP430AFE233IPW datasheet.

How many analog input channels does the MSP430AFE233IPW support?

The MSP430AFE233IPW supports three independent 24-bit sigma-delta ADC channels (SD24_A), each with differential PGA inputs: A0.0±, A1.0±, and A2.0±. These are physically mapped to pins 1–4 and 8–9 on the 24-pin TSSOP package. All three channels operate concurrently, enabling simultaneous voltage, current, and neutral measurements in electricity metering applications using the MSP430AFE233IPW.

What power-saving modes are available on the MSP430AFE233IPW?

The MSP430AFE233IPW offers five low-power modes: LPM0 through LPM4. LPM4 achieves 0.1 µA current at 2.2 V with RAM retention, while LPM3 draws 0.5 µA. Wake-up from LPM4 to active mode occurs in less than 1 µs via DCO stabilization. These modes are integral to extending battery life in portable metering devices using the MSP430AFE233IPW.

Is the MSP430AFE233IPW pin-compatible with other devices in the AFE2xx family?

Yes, the MSP430AFE233IPW is pin-compatible with all 24-pin TSSOP variants in the MSP430AFE2xx family, including MSP430AFE253IPW and MSP430AFE223IPW. They share identical pin functions, package dimensions (7.8 mm × 4.4 mm), and thermal characteristics. This allows hardware reuse across different memory configurations while retaining the same PCB layout for the MSP430AFE233IPW.