Texas Instruments MSP430I2031TPW

Overview

MSP430I2031TPW from Texas Instruments is a 16-bit ultra-low-power mixed-signal microcontroller designed for precision energy metering and sensor signal acquisition. It integrates three 24-bit sigma-delta ADCs with differential PGA inputs, operates from 2.2 V to 3.6 V, delivers 16.384-MHz system clock via internal DCO, and supports eUSCI_A (UART/IrDA/SPI) and eUSCI_B (SPI/I²C) interfaces - enabling high-accuracy current/voltage measurement in single-phase AC/DC power monitoring systems.

For engineers reviewing the MSP430I2031TPW datasheet, MSP430I2031TPW pinout, MSP430I2031TPW application, or MSP430I2031TPW equivalent, key selection criteria include its 28-pin TSSOP package, 32 KB Flash / 2 KB RAM configuration, LPM4.5 shutdown current of 75 nA, integrated LDO core regulator, and dedicated SD24 analog front-end optimized for metrology-grade resolution and noise rejection.

Technical Context

The MSP430I2031TPW implements a 16-bit RISC CPU with constant generators and five low-power modes (LPM0–LPM4.5), achieving wake-up from LPM3 in 1 µs and full active mode operation at 275 µA/MHz (3.0 V). Its analog subsystem centers on three independent 24-bit sigma-delta ADCs (SD24), each with programmable gain amplifier (PGA), differential input pairs, and internal/external reference support - directly targeting high-precision DC and low-frequency AC signal digitization.

Digital peripherals include two 16-bit Timer_A modules (each with three capture/compare registers), hardware multiplier (16×16), and dual eUSCI modules: eUSCI_A0 supports UART with auto-baud detection and IrDA encoding/decoding, while eUSCI_B0 provides synchronous SPI and I²C master/slave capability - all coordinated through a flexible clock system featuring DCO, ACLK, SMCLK, and MCLK domains.

Key Specifications

Pinout & Package

Package: 28-pin TSSOP (PW), 9.7 mm × 4.4 mm body size, with thermal pad not present (RHB variant only). Pin assignments conform to Figure 7-4 in SLAS887C Rev. C.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar metrology microcontroller applications.

Compared with MSP430I2030TPW and MSP430I2021TPW, the MSP430I2031TPW provides greater Flash/RAM headroom for complex energy algorithms and an additional SD24 channel for enhanced measurement flexibility - making it optimal for future-proofed, multi-sensor metering designs requiring field-upgradable firmware.

Availability

MSP430I2031TPW is available at Aetrix Electronics and suitable for single-phase energy meters, industrial current sensor nodes, and smart plug power monitoring applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MSP430I2031TPW 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, power efficiency, and system-level innovation.

The MSP430I2031TPW belongs to TI's MSP430™ Metrology and Monitoring portfolio - engineered specifically for ultra-low-power, high-precision analog measurement in utility, industrial, and medical applications where accuracy, longevity, and integration density are critical.

FAQ

What is the maximum system clock frequency supported by the MSP430I2031TPW?

The MSP430I2031TPW supports a maximum system clock frequency of 16.384 MHz, delivered by its internal digitally controlled oscillator (DCO). This frequency is factory-trimmed and stable across voltage and temperature, enabling precise timing for ADC sampling, UART baud rates, and real-time computations without requiring an external crystal - a key advantage for cost-sensitive and space-constrained metering designs using the MSP430I2031TPW.

Does the MSP430I2031TPW include an internal voltage reference for the SD24 ADCs?

Yes, the MSP430I2031TPW includes an internal 1.2-V reference for the SD24 ADCs (enabled via SD24REFS = 1). When using this reference, the VREF pin must remain unloaded and connected only to the recommended decoupling capacitor (CVREF) to AVSS. The internal reference eliminates dependency on external references unless higher accuracy or temperature stability is required - simplifying design for most MSP430I2031TPW-based metering applications.

How many general-purpose I/O pins does the MSP430I2031TPW provide in the 28-pin TSSOP package?

The MSP430I2031TPW in the 28-pin TSSOP (PW) package provides 16 general-purpose I/O pins across Ports P1 and P2. These pins support peripheral multiplexing (eUSCI, Timer_A, SD24 control) and can be individually configured as inputs, outputs, or alternate-function signals via PxDIR and PxSEL registers - offering flexible signal routing for compact metering PCB layouts using the MSP430I2031TPW.

Can the MSP430I2031TPW operate from a single 3.3-V supply without external regulators?

Yes, the MSP430I2031TPW can operate from a single 3.3-V supply applied to VCC. Its integrated LDO generates a regulated 1.8-V VCORE for the CPU and digital logic, while analog circuits (SD24, reference, LDO) share the 3.3-V rail. This architecture eliminates the need for external core regulators - reducing bill-of-materials and board area in designs based on the MSP430I2031TPW.

What debug interface does the MSP430I2031TPW support, and what pins are required?

The MSP430I2031TPW supports the Spy-Bi-Wire (SBW) debug interface using two pins: RST/NMI/SBWTDIO (pin 15) and TEST/SBWTCK (pin 16). This 2-wire interface enables full flash programming, real-time debugging, and memory access via TI's MSP-FET or compatible tools - providing robust development capability without requiring a full 4-wire JTAG connector on the MSP430I2031TPW target board.