Siproin SSP1922

SSP1922 is a high accurate time measurement (TDC) circuit. SSP1922 integrates analog comparator, analog switch, Schmidt flip-flop and other internal devices, thus greatly simplifying the peripheral circuit. At the same time, the first wave detection function is added inside, so that the anti-interference ability is greatly improved. The programmable offset range of the comparator is increased to ±35mV, the sampling accuracy can be improved. Measuring the relative pulse width of the first wave gives the user an indication of the strength of the received signal. Through this hint, we can judge the abnormal detection of ultrasonic transducer, the increase of wall covering, the presence of bubbles in water and so on. The Start-TOF-Restart command can complete a measurement of ultrasonic time difference (upstream and downstream) and data reading, so as to greatly reduce the software operation and power consumption. Compatible with TDC - GP22.

• Measurement mode 1:
  • 2 channels with typ. 75 ps resolution
  • Channel double resolution with typ. 37 ps
  • Range 3.5 ns (0ns) to 2.5μs
  • 20 ns pulse-pair resolution, 4-fold multihit
• Measurement mode 2:
  • 1 channel with typ. 75 ps resolution
  • Double resolution mode with 37 ps, Quad resolution mode with 19 ps resolution
  • Measurement range 500 ns to 4 ms (4M High speed clock)
  • 3-fold multihit capability with automatic processing of all 3 data
• Analog Input Circuit:
  • Chopper-stabilized low-offset comparator, programmable, ±35mV
  • First-wave detection
  • First-wave pulse-width measurement
  • Integrated analog switches for input selection
  • External circuit is reduced to 2 resistors and 2 capacitors
• Temperature Measurement Unit:
  • 2 or 4 sensors, PT500/PT1000 or higher
  • Schmitt trigger integrated
  • 16-Bit eff. with external Schmitt trigger, 17.5-Bit eff. with integrated low noise Schmitt trigger
  • Ultra low current (0.08 μA when measuring every 30 seconds)
• Special Functions:
  • Fire pulse generator, up to 127 pulses
  • Trigger to rising and/or falling edge
  • Precise stop enable by windowing
  • Low-power 32kHz oscillator (500nA)
  • 7*32 Bit EEPROM
• General:
  • 4-wire SPI interface
  • Operation voltage: 2.5V~3.6V
  • Operation temperature: -40°C~+125°C
  • QFN32/LQFP32 Package

• Ultrasonic Heat meter, water meter
• Laser range finder
• velometer