Texas Instruments MSP430F423AIPMR

Overview

MSP430F423AIPMR from Texas Instruments is an ultra-low-power 16-bit mixed-signal microcontroller featuring three independent 16-bit sigma-delta ADCs with differential PGA inputs, integrated 128-segment LCD driver, 8KB Flash + 256B RAM, and UART/SPI serial interface - designed for battery-powered metering applications including energy meters and handheld weighing scales.

For engineers reviewing the MSP430F423AIPMR datasheet, MSP430F423AIPMR pinout, MSP430F423AIPMR application, or MSP430F423AIPMR equivalent, key selection criteria include its 1.8–3.6 V supply range, sub-6 μs wake-up from standby, FLL+ clock system, SD16 ADC resolution and gain programmability, and QFP-64 package compatibility with industrial LCD display interfaces.

Technical Context

The MSP430F423AIPMR implements a 16-bit RISC CPU with constant generators and seven addressing modes, executing register-to-register instructions in one cycle. Its FLL+ module locks DCO frequency to multiples of a 32.768 kHz crystal, enabling stable MCLK up to 8 MHz while maintaining ultra-low power operation.

Three SD16 sigma-delta ADCs operate independently with fully differential inputs, programmable gain (1× to 16×), internal reference, and integrated temperature sensor. The LCD controller supports static to 4-MUX configurations with dedicated segment/common drive outputs and hardware timing control via Basic Timer1.

Key Specifications

Pinout & Package

Package: 64-pin Plastic Quad Flat Pack (QFP), surface-mount, 10 mm × 10 mm body, 0.5 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430F425AIPMR and MSP430F427AIPMR, the MSP430F423AIPMR provides optimal cost-performance balance for fixed-function metering where 8KB Flash suffices - avoiding over-provisioned memory while retaining identical ultra-low-power behavior, ADC precision, and LCD integration.

Availability

MSP430F423AIPMR is available at Aetrix Electronics and suitable for energy metering, handheld instrumentation, and industrial LCD display systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MSP430F423AIPMR 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 design.

The MSP430F42xA product line was engineered specifically for high-accuracy, battery-operated measurement systems - integrating precision analog front-ends, LCD drivers, and intelligent power management into a single chip for metering and portable instrumentation.

FAQ

What is the maximum operating frequency of the MSP430F423AIPMR's CPU?

The MSP430F423AIPMR features a 16-bit RISC CPU with a 125-ns instruction cycle time, supporting up to 8 MHz MCLK derived from the FLL+ module. This frequency is achievable using the internal digitally controlled oscillator locked to a 32.768 kHz crystal, enabling deterministic real-time execution while maintaining ultra-low power consumption in active mode.

Does the MSP430F423AIPMR support hardware UART communication?

Yes, the MSP430F423AIPMR includes one USART0 peripheral that supports asynchronous UART mode with programmable baud rates, double-buffered transmit/receive, and automatic error detection. It uses P2.4 (UTXD0) and P2.5 (URXD0) pins for hardware UART communication - no software bit-banging required for standard serial protocols.

How many analog input channels does the MSP430F423AIPMR have?

The MSP430F423AIPMR integrates three independent 16-bit sigma-delta ADCs (SD16 modules), each with a fully differential analog input pair (e.g., A0.0+/A0.0--) and programmable gain amplifier. This provides six physical analog input terminals supporting true differential measurements - not six single-ended channels - optimized for precision metrology applications.

Can the MSP430F423AIPMR drive a 4-MUX LCD display?

Yes, the MSP430F423AIPMR's integrated LCD controller supports static, 2-MUX, 3-MUX, and 4-MUX LCD configurations using its 32 segment outputs (S0–S31 plus S34–S35) and four common outputs (COM0–COM3). Driving a 4-MUX display requires external resistive voltage divider or charge pump circuitry to generate proper bias voltages - the MCU handles timing and segment mapping in hardware.

What is the purpose of the RST/NMI pin on the MSP430F423AIPMR?

The RST/NMI pin (Pin 58) serves dual functions: as an active-low reset input with built-in Schmitt trigger for reliable power-on reset, and as a non-maskable interrupt source for critical fault conditions like oscillator failure or brownout events. It is directly connected to the SVS and POR circuits - ensuring deterministic recovery from supply anomalies without firmware dependency.