Time measurement circuit MSKSEMI MSK1022 with ultrasonic TOF measurement and signal strength indication
Product Overview
The MSK1022 is a high-precision time measurement circuit that integrates analog comparators, analog switches, and Schmitt triggers to simplify external 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, which helps identify anomalies such as abnormal ultrasonic transducers, increased wall coverings, or air bubbles in water. The device allows for ultrasonic time-of-flight (TOF) measurements (downstream and upstream) and data reading via commands, reducing software operation and power consumption.
Product Attributes
- Brand: Msksemi
- Origin: Incorporated
Technical Specifications
| Feature | Details |
| Core Functionality | High-precision time measurement circuit with integrated analog comparator, analog switch, Schmitt trigger. First echo detection for improved anti-interference. |
| Measurement Capabilities | Ultrasonic time-of-flight (TOF) measurements (downstream and upstream). Reading of first echo pulse width for signal strength indication. |
| Measurement Range 1 | Dual-channel single-precision mode: 90ps Single-channel dual-precision mode: 45ps Measurement range: 3.5ns (0ns) to 2.4s Minimum pulse interval: 20ns, up to 4 pulses receivable. |
| Measurement Range 2 | 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 data processing. |
| Analog Input Circuit | Integrated analog switch for input selection. Integrated Schmitt trigger. |
| Temperature Measurement | 2 or 4 temperature sensors (PT500/PT1000 or higher). Measures first echo pulse width. Ultra-low power consumption (0.08A when measuring every 30 seconds). |
| Application Scenarios | Ultrasonic heat meters, water meters, laser rangefinders. |
| Package | QFN-32 (5x5) |
| Ordering Information | MSK1022 QFN-32(5x5) 5000PCS |
| Pin Count | 32 |
| Power Supply | VIO (Port Power), VCC (Core Power) |
| Clock Input/Output | XIN, XOUT (High-speed crystal oscillator) CLK32OUT (32kHz clock output), CLK32IN (32kHz clock input) |
| Control Signals | FIRE_UP, FIRE_DOWN, FIRE_IN, INTN, SSN, SCK, SI, SO, RSTN, EN_STOP2, EN_STOP1, STOP2, GND, VCC, STOP1, START, EN_START |
| Temperature Sensing Pins | SENSET, LOADT, PT4, PT3, PT2, PT1 |
| Configuration Registers | 7 groups of 32-bit configuration registers (Address 0-6) for setting operation modes, pulse counts, clock division, crystal startup time, measurement ranges, interrupt triggers, delay values, etc. |
| Result Registers | RES_0 to RES_3 (32-bit each) for measurement results (fixed-point format). |
| Status Register | STAT (13 bits) indicating temperature measurement shorts/opens, pulse counts, overflow flags, and result address pointers. |
| Pulse Width Measurement | PW1ST (8-bit) for pulse width measurement ratio. |
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