Texas Instruments MSP430FE423IPMR

Overview

MSP430FE423IPMR from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller designed for single-phase energy metering applications. It integrates three independent 16-bit sigma-delta ADCs, an embedded signal processor core (ESP430CE1), 8KB flash + 256B RAM, 128-segment LCD driver, and UART/SPI interface - all in a 64-pin LQFP package. It operates from 2.7 V to 3.6 V and supports tamper-resistant 2-wire/3-wire meter designs.

For engineers reviewing the MSP430FE423IPMR datasheet, MSP430FE423IPMR pinout, MSP430FE423IPMR application, or MSP430FE423IPMR equivalent, key selection criteria include integrated ESP430CE1 signal processing for active energy calculation, ultra-low standby current (1.6 µA), LCD segment drive capability (128 segments), and verified operation across –40°C to 85°C industrial temperature range.

Technical Context

The MSP430FE423IPMR implements a 16-bit RISC CPU with constant generators and a digitally controlled oscillator (DCO) enabling sub-6 µs wake-up from LPM3. Its FLL+ frequency-locked loop stabilizes MCLK up to 8.4 MHz using LFXT1 (32.768 kHz watch crystal) or external XT1 sources (up to 8 MHz).

It embeds the ESP430CE1 analog front end with dedicated SD16 sigma-delta converters for I1+, I1−, I2+, I2−, V1+, and V1− inputs - supporting simultaneous current/voltage sampling and on-chip active energy computation per IEC 62053-21/22 standards. The integrated LCD controller drives up to 128 segments with COM0–COM3 backplanes and programmable voltage levels (R03–R33).

Key Specifications

Pinout & Package

Package: 64-pin LQFP (10 mm × 10 mm, PM suffix), RoHS-compliant, with exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar single-phase energy metering applications.

Compared with MSP430FE425IPMR and MSP430FE427IPMR, the MSP430FE423IPMR provides optimal cost-performance balance for basic ANSI C12.20 or IEC 62053-21 compliant meters where 8 KB flash suffices for certified metrology and display logic - avoiding over-provisioned memory and associated validation overhead.

Availability

MSP430FE423IPMR is available at Aetrix Electronics and suitable for 2-wire metering, 3-wire metering, and tamper-resistant utility meter designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MSP430FE423IPMR 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 and embedded processing solutions, with deep expertise in low-power design and precision metrology ICs.

The MSP430FE42x product line was engineered specifically for cost-sensitive, battery-backed single-phase energy meters - integrating metrology-grade ADCs, signal processing, and human-interface peripherals into a single ultra-low-power MCU.

FAQ

What is the maximum operating frequency of the MSP430FE423IPMR?

The MSP430FE423IPMR supports a maximum system clock (MCLK) frequency of 8.4 MHz, achievable via its FLL+ frequency-locked loop using either the internal DCO or external crystal/resonator sources. This frequency is validated across the full 2.7 V–3.6 V supply range and –40°C to 85°C temperature range, ensuring deterministic timing for energy computation and LCD refresh cycles in the MSP430FE423IPMR.

Does the MSP430FE423IPMR include hardware support for energy calculation?

Yes, the MSP430FE423IPMR integrates the ESP430CE1 embedded signal processor core, which performs real-time active energy (kWh) calculation using inputs from its three 16-bit sigma-delta ADCs. This hardware accelerator complies with IEC 62053-21/22 accuracy requirements and eliminates the need for software-based computation, reducing CPU load and improving measurement consistency in the MSP430FE423IPMR.

How many LCD segments can the MSP430FE423IPMR drive directly?

The MSP430FE423IPMR drives up to 128 LCD segments using its integrated controller with four commons (COM0–COM3) and dedicated segment outputs (S0–S31). It supports static, 2-mux, 3-mux, and 4-mux configurations, and includes programmable LCD bias voltage inputs (R03–R33) - enabling direct connection to standard meter displays without external drivers in the MSP430FE423IPMR.

What are the key power-saving features of the MSP430FE423IPMR?

The MSP430FE423IPMR offers five low-power modes, including LPM4 with 0.1 µA RAM retention current at 25°C. Its fast wake-up (<6 µs from LPM3), programmable SVS, and brownout detector enable robust operation during AC line sags. These features collectively extend battery life in backup-powered meters and reduce thermal stress in sealed enclosures - core design advantages of the MSP430FE423IPMR.

Is the MSP430FE423IPMR pin-compatible with other devices in the FE42x family?

Yes, the MSP430FE423IPMR shares identical 64-pin LQFP (PM) packaging, pinout, and peripheral mapping with MSP430FE425IPMR and MSP430FE427IPMR. This allows hardware reuse across meter tiers - for example, designing a single PCB that supports all three variants via flash configuration - simplifying inventory and qualification while scaling functionality in the MSP430FE423IPMR ecosystem.