Product Overview
The MSK1922 is a high-precision time measurement circuit that integrates analog comparators, analog switches, and Schmitt triggers, significantly simplifying peripheral circuitry. It features a first echo detection function for enhanced anti-interference capabilities. By reading the relative width of the first echo pulse, users can receive a signal strength indication, useful for identifying anomalies like abnormal ultrasonic transducers, increased wall coverings, or air bubbles in water. The device supports ultrasonic time-of-flight measurements (flow and reverse flow) and data reading via commands, reducing software operations and power consumption.
Product Attributes
- Brand: Msksemi
- Model: MSK1922
- Copyright: Msksemi Incorporated
- Website: www.msksemi.com
Technical Specifications
| Feature | Specification | Details |
| Measurement Range | Range 1 | Single-channel single-precision mode: 90ps; Single-channel double-precision mode: 45ps |
| Range 2 | 3.5ns (0ns) to 2.4s; Minimum pulse interval, up to 4 pulses received | |
| Range 3 | 500ns to 4ms (at 4M high-speed clock) | |
| Precision | Single-channel single-precision mode | 90ps |
| Double-precision mode | 45ps | |
| Quadruple-precision mode | 22.5ps | |
| Pulse Reception | Range 2 | Can measure 3 pulses, automatically process 3 data points |
| First Wave Detection | Can measure the pulse width of the first wave | |
| Temperature Measurement | Sensors | 2 or 4 temperature sensors (PT500/PT1000 or higher) |
| Functionality | Supports temperature measurement | |
| Analog Input Circuit | Components | Integrated analog switches for input selection, integrated Schmitt trigger |
| Power Consumption | 0.08A (when measuring every 30 seconds) | |
| Application Scope | Ultrasonic heat meters, water meters, Laser ranging | |
| Package | QFN-32(5x5) | |
| Ordering Information | MSK1922, QFN-32(5x5), 5000PCS | |
| Pin Description | XIN/XOUT | High-speed crystal oscillator input/output |
| VIO | Port power supply | |
| Control Registers | Configuration Register 0 | Settings for fire port pulse count, clock division, calibration cycles, crystal startup time, temperature measurement ports, etc. |
| Configuration Register 1 | Settings for ALU calculation results, fast initialization, stop channel pulse count, start/fire pin function selection. | |
| Configuration Register 2 | Interrupt trigger settings, edge sensitivity for channels, delay values for stop pulses. | |
| Configuration Register 3 | Settings for auto-calculation of pulse measurements, first wave detection, overflow handling, measurement range 2 overflow time, relative delay for stop pulses. | |
| Configuration Register 4 | Settings for delay of third stop pulse, pulse width measurement enable/disable, first wave detection edge sensitivity, comparator offset. | |
| Read Registers | Result Registers (RES_0 to RES_3) | Measurement results (fixed-point, 16-bit integer, 16-bit fractional). Negative values only in Measurement Range 1. |
| Status Register (STAT) | Indicates temperature measurement short/open circuit, received pulse counts, coarse count overflow, TDC unit overflow, result address pointer. | |
2509051530_MSKSEMI-MSK1922_C50385426.pdf
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