TI MSP430FR5043IPMR

The MSP430FR604x and MSP430FR504x SoCs belong to the MSP430 ultrasonic sensing microcontroller (MCU) series. They are powerful and highly integrated, designed for various industrial applications. These MCUs offer an integrated ultrasonic sensing solution (USS_A) module, which can provide high-precision measurements for multiple flow rates. The USS module is highly integrated and requires very few external components, which helps achieve ultra-low-power metering and reduces system cost.

The MSP430FR604x and MSP430FR504x devices use a low-power accelerator (LEA), enabling high-speed signal acquisition based on ADC and subsequent optimized digital signal processing. They provide an ideal ultra-low-power, high-precision metering solution for battery-powered metering applications.

The USS_A module includes a programmable pulse generator (PPG) and a physical interface (PHY) with a low-impedance output driver to achieve optimal sensor excitation and accurate impedance matching, thus achieving the best results in zero-flow drift (ZFD). The USS_A module also contains a programmable gain amplifier (PGA) and a high-speed 12-bit 8Msps Σ - Δ ADC (SDHS), facilitating accurate signal acquisition through industry-standard ultrasonic sensors.

In addition, the MSP430FR604x and MSP430FR504x also integrate other peripherals to improve the system's integration in metering. It has a metering test interface (MTIF) module, which can indicate the flow rate measured by the meter through pulse generation. It also has an on-chip 8-channel multiplexed LCD driver (MSP430FR604x only), a real-time clock (RTC), a 12-bit SAR ADC, an analog comparator, an advanced encryption (AES256) module, and a cyclic redundancy check (CRC) module.

The MSP430FR604x and MSP430FR504x MCUs are supported by a wide range of hardware and software ecosystems, with reference designs and code examples provided for quick start of design. The development kits include the MSP - TS430PN80C 80-pin target development board and the EVM430 - FR6043 ultrasonic air flow meter EVM. Free software is also available, including the ultrasonic sensing design center, the ultrasonic sensing software library, and the MSP430Ware software.

The MSP430FR604x and MSP430FR504x MCU series integrate FRAM (ferroelectric RAM) and an MSP system architecture with overall ultra-low power consumption, enabling system designers to improve performance while reducing energy consumption. FRAM technology combines the low-power fast writing, flexibility, and durability of RAM with the non-volatility of flash memory.

• Best-in-class ultralow-power ultrasonic water and gas flow measurement
• Differential time-of-flight (dToF) accuracy of ±12.5μs across low-to-high flow rates and operating temperature range
• ±1% accuracy over wide 500:1 dynamic range
• Maximum measurable flow rate of 8800 L/hr (40 GPM) on a 25mm diameter pipe
• Minimum detectable flow rate below 1 L/hr (0.005 GPM)
• High-precision time measurement resolution below 5ps
• Total current consumption of approximately 3μA at one result set per second
• Wide pipe diameter support from 15mm to 1000mm
• Gas: dToF accuracy of ±250ps across low-to-high flow rates and operating temperature range
• ±1% accuracy at flow rates up to 12000 L/hr with wide 200:1 dynamic range
• Measurable flow rates exceeding 25000 L/hr
• Minimum detectable flow rate below 3 L/hr
• High-precision time measurement resolution below 100ps
• Total current consumption of approximately 20μA at one result set per second
• Low Energy Accelerator (LEA): operates independently of CPU, shares 8KB RAM with CPU, efficient 256-point complex FFT — up to 40× faster than Arm Cortex-M0+ core
• Embedded MCU: 16-bit RISC architecture up to 16MHz, wide supply voltage range: 1.8V to 3.6V
• Optimized ultralow-power modes — Active mode: ~120 µA/MHz; Standby with RTC (LPM3.5): 450nA; Shutdown (LPM4.5): 30nA
• FRAM: up to 64KB non-volatile memory, ultralow-power writes, fast write at 125ns/word (64KB in 4ms), unified memory = program + data + storage in a single memory space, 10^15-cycle write endurance, radiation-tolerant and non-magnetic
• Smart digital peripherals: 32-bit hardware multiplier (MPY), 6-channel internal DMA, RTC with calendar and alarm, six 16-bit timers each with up to 7 capture/compare registers, 32-bit and 16-bit CRC
• High-performance analog: 12-channel analog comparator, 12-bit ADC with window comparator, internal reference, and sample-and-hold with up to 8 external input channels, integrated LCD driver with up to 248-segment contrast control
• Versatile I/O ports: all pins support capacitive touch without external components, bit/byte/word access (paired access), edge-selectable LPM wakeup on all ports, configurable pull-up/pull-down resistors on all ports
• Code security and encryption: 128-bit or 256-bit AES encryption/decryption coprocessor, random seed for random number generation algorithms, IP encapsulation for memory protection against external access, inherent security advantages of FRAM
• Enhanced serial communications: up to 4 eUSCI_A ports with UART supporting automatic baud rate detection, IrDA encoding/decoding; up to 2 eUSCI_B ports with I2C supporting multi-slave addressing; hardware UART or I2C bootloader (BSL)
• Flexible clock system: fixed-frequency DCO with 10 factory-trimmed selectable frequencies, low-power low-frequency internal clock source (VLO), 32kHz crystal (LFXT), high-frequency crystal (HFXT)

• Ultrasonic smart water meter
• Ultrasonic smart gas meter
• Ultrasonic smart heat meter
• Flow transmitter