Texas Instruments MSP430FW423IPMR

Overview

MSP430FW423IPMR from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller with integrated LCD driver (96 segments), scan interface for sensor measurement, two 16-bit timers (Timer0_A3 and Timer1_A5), comparator_A, and 8KB flash/256B RAM in a 64-pin QFP package. It operates from 1.8 V to 3.6 V and targets battery-powered metering applications requiring sub-6 µs wake-up from standby mode.

For engineers reviewing the MSP430FW423IPMR datasheet, MSP430FW423IPMR pinout, MSP430FW423IPMR application, or MSP430FW423IPMR equivalent, key selection criteria include its dedicated scan interface for resistive/GMR sensors, integrated LCD drive capability, ultra-low-power operation (0.1 µA in off mode), and JTAG/BSL programmability without external voltage.

Technical Context

The MSP430FW423IPMR implements a 16-bit RISC CPU with constant generators and 125-ns instruction cycle time, paired with FLL+ frequency-locked loop for stable clock generation from internal DCO or external 32.768 kHz crystal. Its architecture supports five software-selectable low-power modes, enabling rapid wake-up (<6 µs) and extended battery life in portable sensing systems.

It integrates a dedicated Scan Interface (SIF) with four excitation channels (SIFCH0–SIFCH3), comparator output (SIFCAOUT), 10-bit DAC (SIFDACOUT), and sensor common (SIFCOM) - all optimized for background volume measurement in gas, heat, and water meters. The SIF operates independently of CPU execution, enabling continuous analog front-end monitoring during LPM3/LPM4.

Key Specifications

Pinout & Package

Package: 64-pin Quad Flat Pack (QFP), 10 mm × 10 mm, 0.5 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FW423IPMR, the MSP430FW425IPMR offers double flash capacity with identical SIF and LCD functionality, while the MSP430FR4133IPM replaces SIF with FRAM and Sigma-Delta ADC - making it suitable for general-purpose sensing but not for legacy scan-interface meter designs.

Availability

MSP430FW423IPMR is available at Aetrix Electronics and suitable for gas metering, water metering, heat metering, and industrial counter applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MSP430FW423IPMR 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 decades of expertise in ultra-low-power microcontrollers for industrial and metering markets.

The MSP430FW42x product line was designed specifically for utility metering applications, integrating scan interface, LCD driver, and ultra-low-power operation to replace discrete analog front-ends and reduce system-level BOM cost.

FAQ

What is the maximum LCD segment count supported by the MSP430FW423IPMR?

The MSP430FW423IPMR supports up to 96 LCD segments with 1/2–1/4 bias in static, 2-MUX, 3-MUX, or 4-MUX configurations. This is implemented via dedicated hardware registers and automatic COM/SEG signal generation - no CPU intervention is required during active display refresh. The MSP430FW423IPMR uses COM0–COM3 and 96 individual segment pins mapped across Ports P1–P6 to achieve this capability.

Does the MSP430FW423IPMR include hardware support for sensor excitation and signal conditioning?

Yes, the MSP430FW423IPMR integrates a dedicated Scan Interface (SIF) with four excitation outputs (SIFCH0–SIFCH3), four comparator inputs (SIFCI0–SIFCI3), a 10-bit DAC (SIFDACOUT), and common termination (SIFCOM). This hardware block operates autonomously during low-power modes and is explicitly designed for resistive, LC, and GMR sensor interfaces in metering applications - confirmed in the SLAS383E datasheet functional block diagram and Table 1 terminal functions.

What programming interfaces are available for the MSP430FW423IPMR?

The MSP430FW423IPMR supports JTAG (via TCK/TMS/TDI/TDO pins) and UART-based Bootstrap Loader (BSL) programming through P1.0 (TXD) and P1.1 (RXD). The BSL requires no external programming voltage and is protected by a user-defined password stored in information memory. Both interfaces allow full flash and RAM programming, and the BSL is accessible even after code protection fuse activation - per SLAU319 and SLAS383E documentation.

What is the wake-up time from lowest-power mode on the MSP430FW423IPMR?

The MSP430FW423IPMR wakes up from Standby mode (LPM3) in less than 6 µs, as specified in the SLAS383E datasheet. This includes full stabilization of the FLL+ clock system and readiness of all peripherals. The wake-up latency is deterministic and independent of clock source - whether using internal DCO or external 32.768 kHz crystal - enabling reliable event-triggered response in battery-operated meters.

How does the MSP430FW423IPMR handle power-supply supervision and brownout protection?

The MSP430FW423IPMR includes an integrated Supply Voltage Supervisor (SVS) with programmable threshold detection. It supports both automatic reset (brownout) and flag-only monitoring modes. SVSIN (P6.7) accepts external analog input for custom threshold setting, while SVSOUT (P1.3) provides a digital output indicating supply status. The module ensures safe initialization and prevents erratic operation during voltage ramp-up or sag - critical for metering reliability.