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TDC-GP22 Time Digital Converter Module 4 Line SPI Interface Time Digital Converter 2.5V to 3.6V 500 KHz for Ultrasonic Water Meter

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Special Features

  • The high-precision timing chip TDC-GP22 is the next generation product of ACAM that is upgraded from the original TDC-GP21. It increases the dynamic range of TDC-GP. At the same time, the performance of the programmable comparator has been further improved in terms of the adjustment range and time measurement accuracy. The time measurement accuracy is up to 90ps, and the offset adjustment range is increased to ± 35mV.
  • Features: The pulse generator of TDC-GP22 can directly drive the ultrasonic transducer in the flow measurement of small pipe diameter, without additional driver chips, simplifying the design and reducing the cost; High precision time measurement, simple external circuit, integrated internal signal processing algorithm, and ultra-low overall power consumption measurement characteristics make it very suitable for the application of ultrasonic water meter.
  • Maximum temperature ：The maximum temperature requirement for the resin surface, given 260ºC as the peak temperature of the package body's surface, is that the resin surface temperature must not exceed 250ºC for more than 10 seconds. This temperature should be kept as low as possible to reduce the load caused by thermal stress on the package, which is why soldering for short periods only is recommended.
  • Printed Circuit Board: Vio and Vcc should be provided by a battery or fixed linear vol tage regulator. Do not use switched regulators to avoid disturbances caused by the I/O supply. Vio and Vcc are connected internally on the chip. The resistance between both is in the range of several Ohms. However, Vio is connected to the pads with significantly lower impedance and therefore can provide this better than Vcc.
  • Note: The write registers of TDC-GP22 are fully upwards compatible with TDC-GP21. In addition, the formerly unused bits 30, 31 in register 3 activate new functionality. Especially with bit 30 the First Wave Mode is switched on and the parameter bits DELVAL2 and DELVAL3 in registers 3 and 4 get a second meaning. For proper work of TDC-GP22, a power-up reset via pin or SPI command is necessary after the power-up of the circuit.

Description

Description: TDC-GP22 is the next generation upgrade of TDC-GP21. It is a 100% pin to pin and functional TDC-GP21 compatible upgrade with extended functionality. Especially, the new first wave detection capability makes TDC-GP22 very suitable for high dynamic ultrasonic water meter. The programmable offset range of the comparator is increased to ± 35 mV After the first wave detection, the offset is automatically set back to zero. The measurement of the pulse width relative to the first wave provides the user with an indication of the received signal strength. This can be used for long-term signal attenuation or bubble detection with the system. Compared with TDC-GP21, multi hit data processing and data readout are simplified.
All in all, the TDC-GP22 is a further improvement and simplification for the design of ultrasonic heat meters and a necessary step for compact ultrasonic water meters.

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