Texas Instruments MSP430F423IPMR

Overview

MSP430F423IPMR from Texas Instruments is an ultra-low-power 16-bit RISC microcontroller with three independent 16-bit sigma-delta ADCs, 8 KB flash + 256 B RAM, integrated 128-segment LCD driver, and UART/SPI serial interface-designed for handheld metering, weigh scales, and energy meters operating from 1.8 V to 3.6 V.

For engineers reviewing the MSP430F423IPMR datasheet, MSP430F423IPMR pinout, MSP430F423IPMR application, or MSP430F423IPMR equivalent, key selection criteria include standby current (1.6 µA), wake-up time (<6 µs), SD16 ADC resolution and PGA support, LCD segment count, and LQFP-64 package compatibility with TI's MSP430x4xx family toolchain.

Technical Context

The MSP430F423IPMR implements a 16-bit CPU with constant generators and a digitally controlled oscillator (DCO), enabling sub-6-µs wake-up from LPM3 and deterministic real-time response in battery-powered measurement systems. Its FLL+ frequency-locked loop stabilizes MCLK up to 8 MHz using internal or external (LFXT1/XT1) clock sources.

All three SD16 ADCs feature differential programmable-gain amplifier inputs, configurable oversampling, and built-in temperature sensor/voltage reference-enabling high-precision DC measurements without external signal conditioning. The integrated LCD controller drives up to 128 segments with software-selectable multiplexing (1–4 COM).

Key Specifications

Pinout & Package

LQFP-64 (10 mm × 10 mm) package with exposed thermal pad; RoHS-compliant, industrial temperature range (–40°C to 85°C).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power metrology microcontroller applications.

Compared with MSP430F425IPMR and MSP430F427IPMR, the MSP430F423IPMR provides optimal cost/performance balance for entry-level handheld meters where 8 KB flash suffices and BOM cost sensitivity is high-without sacrificing ADC precision, LCD capability, or ultra-low-power operation.

Availability

MSP430F423IPMR is available at Aetrix Electronics and suitable for handheld metering equipment, weigh scales, and energy meters requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MSP430F423IPMR 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 precision measurement.

The MSP430F423IPMR belongs to the MSP430x4xx ultra-low-power MCU family, engineered specifically for high-resolution, battery-operated metrology applications requiring integrated analog front-ends, LCD control, and deterministic real-time response.

FAQ

What is the maximum system clock frequency supported by the MSP430F423IPMR?

The MSP430F423IPMR supports a maximum processor frequency of 8 MHz on MCLK, achieved via the FLL+ using either internal DCO or external XT1 crystal (up to 8 MHz). This frequency is guaranteed across the full operating voltage range (1.8 V to 3.6 V) and temperature range (–40°C to 85°C), as specified in Section 5.3 of the SLAS421B datasheet. The MSP430F423IPMR maintains timing integrity at this speed while consuming only 400 µA in active mode at 1 MHz/3 V.

Does the MSP430F423IPMR support hardware-based UART communication?

Yes, the MSP430F423IPMR includes USART0, which can be configured in asynchronous UART mode using P2.4/UTXD0 and P2.5/URXD0 pins. It supports standard baud rates, parity, stop bits, and automatic baud-rate detection-enabling reliable communication with modems, host processors, or PC interfaces. UART functionality is fully integrated and requires no external transceiver for TTL-level operation, as confirmed in Section 1.1 and Table 4-1 of the SLAS421B datasheet.

How many analog input channels does the MSP430F423IPMR provide for its sigma-delta ADCs?

The MSP430F423IPMR integrates three independent 16-bit sigma-delta ADC modules (SD16), each with a dedicated differential programmable-gain amplifier input stage. These are accessed via six pins: A0.0+/A0.0−, A1.0+/A1.0−, and A2.0+/A2.0−-supporting three simultaneous differential analog inputs. This architecture enables concurrent high-precision acquisition from multiple sensors, such as current and voltage channels in energy meters, as detailed in Section 1.1 and Figure 1-1 of the SLAS421B datasheet.

Can the MSP430F423IPMR drive a 128-segment LCD directly without external components?

Yes, the MSP430F423IPMR includes a fully integrated LCD controller capable of driving up to 128 segments using four commons (COM0–COM3) and 32 segment lines (S0–S31). It supports static, 2-, 3-, and 4-mux configurations and generates internal bias voltages-eliminating the need for external LCD bias ICs or resistor networks. This capability is explicitly stated in Section 1.1 and verified in the functional block diagram (Figure 1-1) of the SLAS421B datasheet.

What is the typical wake-up time from standby mode for the MSP430F423IPMR?

The MSP430F423IPMR wakes up from standby mode (LPM3) in less than 6 µs, as confirmed in Section 1.1 of the SLAS421B datasheet. This fast wake-up is enabled by the FLL+ and DCO architecture, allowing the device to rapidly resume ADC sampling or timer operations after interrupt events-critical for duty-cycled metrology applications where responsiveness and power efficiency must coexist.