Maxim Integrated's MAX35104ETL+ is a gas flow meter system-on-chip (SoC) designed as an analog front-end solution for the medical ventilator and ultrasonic gas meter markets. MAX35104ETL+ has a measurement accuracy of 700 ps and an automatic differential time of flight (TOF) that allows for simplified computation of gaseous flow. An early edge detection ensures measurements are made with consistent wave patterns that allows improved accuracy and eliminate erroneous measurements. A built-in arithmetic logic unit provides TOF difference measurements and programmable receiver hit accumulators to minimize the host microprocessor access. For temperature measurement, the device supports a single 2-wire PT1000 platinum resistive temperature detector (RTD) or NTC thermistor. A simple 4-wire SPI interface allows any microcontroller to effectively configure the device for its intended measurement.

MAX35104EVKIT# is an evaluation kit that provides the hardware and graphical user interface (GUI) software necessary to evaluate the MAX35104ETL+. The EV kit includes the MAX35104ETL+ installed, as well as the required USB-to-SPI interface needed to communicate with the IC. The USB-to-SPI master section of the EV kit, along with the EV kit software, provides a quick approach to test the device’s functionality.