MSP430™ ultrasonic & rotary flow sensing MCUs
Ultra-low-power SoCs for water, gas and heat meters
System-on-chip MSP430™ ultrasonic and performance sensing MCUs are designed for high-accuracy water, heat and gas flow measurement applications. The MCUs feature integrated peripherals including an ultrasonic sensing analog front end, extended scan interface and DSP capabilities, and all MCUs feature a real time clock, LCD driver, 12-bit SAR ADC and comparator.
Ultrasonic sensing SoCs
- High-precision ultrasonic flow sensing
- Ultrasonic MCUs with integrated AFE
- Integrated 8 MSPS sigma-delta ADC
- Metering test interface (MTIF)
Rotary flow sensing SoCs
- Ultra-low power extended scan interface peripheral
- Supports up to 3 LC rotation detection sensors
- Supports TMR, GMR, Hall-effect and optical sensors
Signal processing MCUs
- Integrated low-energy accelerator (LEA)
- 40x the performance of Arm Cortex M0+ MCUs
- Efficient FIR and FFT filter implementations
Why ultrasonic sensing for flow meters?
Ultrasonic sensing uses the time of flight (TOF) of an ultrasonic wave within any liquid or gas medium and its dependency on the flow rate to measure and calculate volume flow. This technique uses the difference in the propagation time of the ultrasonic wave when transmitted into and against the direction of the flow. This technology is robust and accurate in measuring volume flow rates across a wide dynamic range.
Ultrasonic flow meter features
Ultrasonic sensing provides:
- High accuracy <±1% of flow measurement
- No moving parts or wear and tear for longer operational life and cost effectiveness with less service/maintenance
- Resistant to vibration, infrared radiation and EMI
Works well on fluids including:
Works well on gases including:
- Carbon dioxide
TI’s waveform capture-based approach for ultrasonic sensing
MSP430 ultrasonic sensing SoCs facilitate a unique waveform capture based technique, where the entire response of the transducer is captured in time domain for both the upstream and downstream conditions. Post-processing on these waveforms determine the differential time of flight (TOF).
Benefits of the waveform approach
- Robustness to signal amplitude variation (transducer-transducer variation, different material compositions, high flow rates, noise, temperature variation, etc.)
- Leak detection combined with very high accuracies at low-flow rates
- Suppression of noise to achieve higher accuracy and reduced variations
- 3V drive capabilities for transducers using standard MCU voltage levels
- Ability to extend to material and composition analysis
- Additional capabilities for meter diagnostics over time to:
- Detect slow variation in envelop due to transducer aging, adjusts transducer-transducer resonant frequency variation
- Eliminate periodic calibration over the lifetime of a product
Ultrasonic sensing solution analog front end (AFE)
The Ultrasonic sensing sub-system peripheral is a integrated analog front end which can directly excite a wide range of transducers and has a integrated PHY for impedance matching. It also has a integrated programmable gain amplifier (PGA) and a high speed 8MSPS sigma-delta ADC in the receive section, which enables waveform capture in real time.
Features of the ultrasonic sensing AFE
- Direct interface to a variety of transducers
- Programmable pulse excitation for a wide range of transducers
- PHY for transducer impedance matching
- Programmable gain amplifier (PGA) for signal amplification up to 35dB
- Real-time waveform capture using an integrated high-speed 8MSPS sigma-delta analog-to-digital converter (ADC)
Get started with MSP430 ultrasonic sensing SoCs
Unique high-speed ADC-based ultrasonic sensing technique
High accuracy, high precision measurements
Low power (~ 3uA) for 1meas/ sec
Low flow rate detection (<1L/h)
One-stop-shop for ultrasonic sensing development
Real-time waveform capture and plot of key parameters for added intelligence
GUI for ease of development
Easy interface to ultrasonic transducers
BoosterPack™ connectors to add functionality: RF, battery management, temperature measurement, etc.
Power consumption analysis and LCD display capabilities
On-board programming and debug
Signal processing MCUs
The low-energy accelerator (LEA) module is a 32-bit hardware engine designed for operations that involve vector-based signal processing such as FIR, IIR and FFT. These operations are done without CPU intervention and trigger an interrupt when the operation is completed. The LEA module supports multiple commands, which are issued by the CPU and performs vector math operations up to 40x faster than Arm® Cortex®-M0+ MCUs running the CMSIS DSP library and minimal energy consumption.
Benefits of signal processing MCUs
- 32-bit hardware engine
- No CPU intervention – triggers an interrupt when operation is complete
- Performs math operations up to 40x faster than Arm Cortex-M0+ MCUs
- Little DSP expertise required with free optimized DSP Library
- Vector-based signal processing: FIR, IIR, FFT
- Supports 16-bit and 32-bit fixed point operations in both the real and complex domains
Rotary flow sensing SoCs
For water, gas and heat meters that use conventional mechanical technologies, flow is determined by a spinning wheel that rotates at a speed proportional to the flow rate. Extended Scan Interface (ESI) is an analog-front-end (AFE) integrated in the MSP430FR6989 MCU family to automatically measure linear or rotational motion of sensors with the lowest possible power consumption.
Benefits of rotary flow sensing SoCs
- Robust state machine enables run-time calibration and sensor detection, etc.
- Direct interface with different sensors including inductive (LC), Hall-effect, magneto-resistive (GMR and TMR) and optical transducers.
- Accurately measures linear or circular motion across a wide-dynamic range of flow rates
- Works with sensors without CPU intervention to deliver measurements at the lowest power