1 Features

Best-in-class ultrasonic water and gas flow measurement with ultra-low power consumption
- Water
  - ±12.5-ps differential time of flight (dToF) accuracy at low to high flow rates and across operating temperature
  - Achieves ±1% accuracy for a wide dynamic range of 500:1
  - Ability to measure a maximum flow rate of 8800 liters/hour (40 gallons/minute) on 25‑mm diameter pipe
  - Ability to detect a minimum flow rate of <1 liter/hour (0.005 gallons/minute)
  - High-precision time measurement resolution of <5 ps
  - Approximately 3-µA overall current consumption with 1 set of results per second
  - Ability to support a wide pipe sizes with 15‑mm to 1000-mm diameter
- Gas
  - ±250-ps differential time of flight (dToF) accuracy at low to high flow rates and across operating temperature
  - Achieves ±1% accuracy up to 12000 liters/hour with a wide dynamic range of 200:1
  - Ability to measure a flow rate >25000 liters/hour
  - Ability to detect a minimum flow rate of <3 liters/hour
  - High-precision time measurement resolution of <100 ps
  - Approximately 20-µA overall current consumption with 1 set of results per second
Compliant to and exceeds ISO4064, OIML R49, EN 14236 and EN 1434 accuracy standards
Ability to directly interface standard ultrasonic sensors (up to 2.5 MHz)
Integrated analog front end – Ultrasonic Sensing Solution (USS_A) that includes
- Programmable pulse generator (PPG) to generate multi-tone pulses at various frequencies
- Integrated PHY with low-impedance output driver (4 Ω) to control input and output channels
- High-performance high-speed 12-bit analog-to-digital converter (SDHS) with output data rates up to 8 Msps
- Programmable gain amplifier (PGA) with gain of –6.5 dB to 30.8 dB
- High-performance PLL with output range of 68 to 80 MHz
Metering test interface (MTIF)
- Pulse generator and pulse counter
- Pulse rates up to 1024 pulses per second (p/s)
- Count capacity up to 65535 (16 bit)
- Operates in LPM3.5 with 200 nA (typical)
Low-energy accelerator (LEA)
- Operation independent of CPU
- 8KB of RAM shared with CPU
- Efficient 256-point complex FFT: Up to 40x faster than Arm® Cortex®-M0+ core
Embedded microcontroller
- 16-bit RISC architecture up to 16‑MHz clock
- Wide supply voltage range: 1.8 V to 3.6 V ⁽¹⁾
Optimized ultra-low-power modes
- Active mode: approximately 120 µA/MHz
- Standby mode with real-time clock (RTC) (LPM3.5): 450 nA ⁽²⁾
- Shutdown (LPM4.5): 30 nA
Ferroelectric random access memory (FRAM)
- Up to 64KB of nonvolatile memory
- Ultra-low-power writes
- Fast write at 125 ns per word (64KB in 4 ms)
- Unified memory = program + data + storage in one single space
- 10¹⁵ write cycle endurance
- Radiation resistant and nonmagnetic
Intelligent digital peripherals
- 32-bit hardware multiplier (MPY)
- 6-channel internal DMA
- RTC with calendar and alarm functions
- 6 16-bit timers with up to 7 capture/compare registers each
- 32-bit and 16-bit cyclic redundancy check (CRC)
High-performance analog
- 12-channel analog comparator
- 12-bit ADC featuring window comparator, internal reference, and sample-and-hold, with up to 8 external input channels
- Integrated LCD driver with contrast control for up to 248 segments
Multifunction input/output ports
- All pins support capacitive-touch capability with no need for external components
- Accessible bit-, byte-, and word-wise (in pairs)
- Edge-selectable wake from LPM on all ports
- Programmable pullup and pulldown on all ports
Code security and encryption
- 128- or 256-bit AES security encryption and decryption coprocessor
- Random number seed for random number generation algorithms
- IP encapsulation protects memory from external access
- FRAM provides inherent security advantages
Enhanced serial communication
- Up to 4 eUSCI_A serial communication ports
  - UART with automatic baud-rate detection
  - IrDA encode and decode
- Up to 2 eUSCI_B serial communication ports
  - I²C with multiple-slave addressing
- Hardware UART or I²C bootloader (BSL)
Flexible clock system
- Fixed-frequency DCO with 10 selectable factory-trimmed frequencies
- Low-power low-frequency internal clock source (VLO)
- 32-kHz crystals (LFXT)
- High-frequency crystals (HFXT)
Development tools and software
Device Comparison summarizes the available device variants and package options

1. Minimum supply voltage is restricted by SVS levels (see the SVS specifications)

2. The RTC is clocked by a 3.7-pF crystal.