MSKSEMI MSK1922

High-precision time measurement circuit with integrated analog comparator, analog switch, Schmitt trigger, and other components, greatly simplifying the peripheral circuitry. An internal first-wave detection function is incorporated to significantly enhance noise immunity. By reading the relative width of the first echo pulse, users can obtain an indication of the received signal strength. This indication enables detection of abnormal conditions such as ultrasonic transducer faults, increased pipe wall deposits, and air bubbles in the water. A single command can complete one ultrasonic transit-time (downstream and upstream) measurement and data readout, greatly reducing software overhead and power consumption.

• Dual-channel single-precision mode 90ps; single-channel dual-precision mode 45ps; measurement range 3.5ns (0ns) to 2.4μs; 20ns minimum pulse interval, up to 4 pulses receivable
• First-wave detection; pulse width measurement of first wave; integrated analog switch for input selection
• Single-channel single-precision mode 90ps; dual-precision mode 45ps; quad-precision mode 22.5ps; measurement range 500ns to 4ms (at 4M high-speed clock); up to 3 pulses measurable with automatic processing of 3 data sets
• 2 or 4 temperature sensors, PT500/PT1000 or higher; integrated Schmitt trigger
• Ultra-low power consumption (0.08μA at one measurement per 30 seconds)

• Ultrasonic heat meters, water meters
• Laser ranging