Texas Instruments MSP430FR6035IPZR

Overview

MSP430FR6035IPZR from Texas Instruments is an ultrasonic sensing SoC MCU optimized for battery-powered water metering, featuring integrated Ultrasonic Sensing Solution (USS), 128KB FRAM, 8KB RAM, 16-bit RISC CPU up to 16 MHz, and <25-ps differential time-of-flight accuracy with ~3-µA average current per measurement.

For engineers reviewing the MSP430FR6035IPZR datasheet, MSP430FR6035IPZR pinout, MSP430FR6035IPZR application, or MSP430FR6035IPZR equivalent, this page delivers verified technical context, real-world timing performance metrics, low-power mode behavior, USS subsystem architecture, and validated alternative options for ISO 4064-compliant metering designs.

Technical Context

The MSP430FR6035IPZR implements a dedicated ultrasonic sensing signal chain: programmable pulse generator (PPG) drives transducers up to 2.5 MHz; low-impedance (4-Ω) PHY ensures precise impedance matching; PGA offers –6.5 dB to 30.8 dB gain; and high-speed 12-bit sigma-delta ADC (SDHS) samples at up to 8 Msps for sub-5-ps time resolution.

It integrates a low-energy accelerator (LEA) for FFT-based signal processing independent of CPU, enabling 256-point complex FFT up to 40× faster than Cortex-M0+; supports LPM3.5 (450 nA) with RTC and MTIF active; and uses FRAM for unified nonvolatile program/data storage with 10¹⁵ write endurance and radiation resistance.

Key Specifications

Pinout & Package

Package: 100-pin LQFP (PZ), 14 mm × 14 mm body size, with dedicated ultrasonic I/O pins (CH0_IN/CH0_OUT/CH1_IN/CH1_OUT/USSXTIN/USSXTOUT), MTIF signals (MTIF_OUT_IN, MTIF_PIN_EN), and LCD segment drivers (LCDS0–LCDS38, COM0–COM7).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MSP430FR6035IPZR, the MSP430FR6037IPZR provides double FRAM capacity for expanded metrology data history, while the MSP430FR6045IPZR adds UART BSL for secure firmware updates-both retain identical ultrasonic sensing performance and LPM3.5 current draw.

Availability

MSP430FR6035IPZR is available at Aetrix Electronics and suitable for ultrasonic water metering, heat metering, liquid level sensing, and leak detection applications requiring stable component supply across multi-year production cycles.

Supply support for MSP430FR6035IPZR 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 energy efficiency, reliability, and system-level integration.

The MSP430FR603x family targets battery-operated utility metering applications, combining ultrasonic sensing precision, FRAM durability, and ultra-low-power operation to replace electromechanical and magnetic flow meters.

FAQ

What is the primary metrology function of the MSP430FR6035IPZR in water metering systems?

The MSP430FR6035IPZR performs ultrasonic time-of-flight (dTOF) measurement using its integrated USS module-including PPG, 4-Ω PHY, PGA, and 8-Msps SDHS ADC-to calculate flow rate with <25-ps accuracy. It processes echo signals via LEA-accelerated FFT and computes ISO 4064-compliant flow values while consuming ~3 µA average current per measurement, enabling multi-year battery life in sealed meters.

Does the MSP430FR6035IPZR support external ultrasonic transducers operating above 1 MHz?

Yes, the MSP430FR6035IPZR directly interfaces standard ultrasonic sensors up to 2.5 MHz via its dedicated CH0_IN/CH0_OUT and CH1_IN/CH1_OUT pins. Its programmable pulse generator (PPG) and low-impedance (4-Ω) PHY output driver ensure optimal excitation and impedance matching for high-frequency transducers, critical for achieving low zero-flow drift in cold-water applications.

How does the MTIF module operate in low-power modes on the MSP430FR6035IPZR?

The MTIF module on the MSP430FR6035IPZR operates in LPM3.5 with only 200 nA typical current, generating or counting pulses independently of the CPU. It features a 16-bit counter (65535 max) and pulse generator capable of up to 1016 pulses per second-meeting EN 1434 requirements for utility billing outputs without waking the core, preserving battery life in always-on metering deployments.

What memory architecture does the MSP430FR6035IPZR use, and why is it advantageous for metering?

The MSP430FR6035IPZR uses 128KB ferroelectric RAM (FRAM) with unified program/data/storage space, 125 ns write speed, and 10¹⁵ write-cycle endurance. This eliminates flash erase delays and wear leveling complexity, enabling reliable hourly log writes, secure firmware updates, and tamper-proof calibration storage-critical for 15+ year utility meter lifespans where data integrity and longevity are mandated.

Is the MSP430FR6035IPZR pin-compatible with other devices in the MSP430FR603x/604x family?

Yes, the MSP430FR6035IPZR shares the same 100-pin LQFP (PZ) package, pinout, and footprint with MSP430FR6037IPZR, MSP430FR6045IPZR, and MSP430FR6047IPZR. All variants maintain identical I/O mapping, power pin locations, and ultrasonic channel assignments-allowing hardware reuse across accuracy tiers and feature sets without PCB redesign.