Mouser Electronics is now stocking the PGA460 and PGA460-Q1 ultrasonic signal processors and drivers from Texas Instruments. There are automotive (PGA460-Q1) and non-automotive (PGA460) processor options. These devices are ultrasonic sensors that support wide-distance object detection at low power. This makes them suited to address a range of ultrasonic position sensing and robotics applications.
The TI PGA460 and PGA460-Q1 devices are highly integrated system-on-chip (SoC) ultrasonic transducer drivers and signal conditioners with an advanced DSP core. The devices have two driver-based topologies. One is a transformer-based topology that uses a complimentary low-side driver pair that can drive up a transducer using a step-up transformer. The other is a direct-drive topology that utilized external high-side FETs.
The devices have an echo signal for object detection that reliably detects at distances as low as 5 cm to as high as 11 m. This is possible through the devices’ analog front-end (AFE), with a low-noise amplifier followed by a programmable time-varying gain stage that feeds into an analog-to-digital converter (ADC). This digitized signal is processed in the DSP core for both near-field and far-field object detection using time-varying thresholds.
Communication interfaces include a time-command interface (TCI), a one-wire USART asynchronous interface and a CMOS-level USART. The devices have on-chip system diagnostics that provide information like transducer voltage, frequency and decay time. TI P0GA460 devices are supported by the BOOSTXL-PGA460 evaluation module that works with TI MSP430 USB LaunchPad evaluation kit to create a USB-to-PC graphical user interface (GUI) communication bridge.
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