ZHCSKL1A December 2019 – May 2022 TUSS4440
PRODUCTION DATA
The TUSS4440 device must be paired with an external ultrasonic transducer. The TUSS4440 device drives the transducer to generate an ultrasonic echo and applies logarithmic gain scaling to the received echo signal in the analog front end. The transducer should be chosen based on the resonant frequency, input voltage requirements, sensitivity, beam pattern, and decay time. The TUSS4440 device is flexible enough to meet most transducer requirements by adjusting the driving frequency, driving current limit, and center frequency of the band-pass filter.An external transformer should be chosen to meet the driver voltage requirements of the transducer and have a saturation current rated equal to or greater than the configured driving current limit of the TUSS4440 device. The only available interface to configure the device registers is SPI. During the burst-and-listen cycles, an external ADC or analog receiver should be used to capture the echo envelope from the VOUT pin to compute time of flight (ToF), distance, amplitude, and/or width of the return echo.