HOW DOES IT WORK?

Ultrasonic 5 Click is based on the TUSS4470, a transformer-drive ultrasonic sensor IC with a logarithmic amplifier from Texas Instruments. This highly integrated driver and receiver IC is designed especially for ultrasonic transducers operating in a range of 40KHz up to 1MHz, with pre-driver mode. It has three configurable drive stages: a direct drive using an internal H-bridge for transducer excitation, a pre-driver configuration to use an internal H-bridge to drive external FETs for the higher current drive, and configurable burst patterns over the SPI interface. Also, it has a configurable bandpass filter, wide-band logarithmic amplifier, and first-stage adjustable low-noise amplifier.

The cut-off frequency of the low-pass filter can be set over the left frequency selection FREQ SEL jumper with options 40K and 1M, where the 40K(Hz) is set by default. The negative transducer receive path has a frequency selection FREQ SEL jumper on the right side with the same values as the left FREQ SEL jumper. It is also set to 40K as default. It is possible to select some other frequency for both sides by replacing the CINN capacitors (C7, C8) and the CFLT capacitors (C5, C6).

Users can choose a burst pattern from an integrated pulse generator to feed the output driver. There are 4 IO_MODEs that supply the desired frequency through an external clock. This enables you to supply a highly precise clock calibrated to the center frequency of the transducer to enable the highest sound pressure level generation.

Ultrasonic 5 Click has a 3-pin terminal (OUTB, GND, OUTA) to connect with the ultrasonic sensor (one UTR-1440K ultrasonic sensor comes with the board). The UTR-1440K ultrasonic sensor comes in an aluminum housing, and its terminal material is tin-plated copper. Its echo sensitivity is ≥200 millivolts. In addition, a zero-crossing signal output (OUT3 header) can be used to validate the frequency of the received echo signal to provide robustness against interference from other signals. It is derived from a row amplified input signal from a particular stage as it is demodulated in the log amp block.

The ultrasonic sensor can work on different voltages. Over the VPWR SEL jumper, you can power the transformer-drive IC and the ultrasonic sensor itself with 5V or higher voltages by setting the VOUT option. The 5V from the mikroBUS™ socket power rail is set by default. If you want to use 12V or 24V to power the sensor and the IC, you must set the VOUT option and choose an appropriate voltage over the VOUT SEL just below (12V is set by default). The TLV61046A, an output voltage boost converter with a power diode and isolation switch from Texas Instruments, provides the 12V and 24V voltages.

Ultrasonic 5 Click uses a standard 4-Wire SPI interface to communicate with the host MCU and provide full-duplex communication. The demodulated echo analog output of the IC is available on the AN pin. The echo interrupt signal is available on the INT pin, which goes HIGH logic when the signal on the demodulated echo analog output pin crosses a defined threshold. The configurable burst patterns can be chosen over the IO1 and IO2 pins.

This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the VIO SEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. Also, this Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development.

SPECIFICATIONS