TI PGA460TPW

The PGA460 device is a highly integrated system-on-chip ultrasonic transmitter driver and signal conditioner equipped with an advanced DSP core. The device features a complementary low-side driver pair that can drive the transducer using a step-up transformer in a transformer-based topology or an external high-side FET in a direct-drive topology. The device can receive and condition the reflected echo signals for reliable object detection. This functionality is achieved using an analog front end (AFE) that includes a low-noise amplifier and a programmable time-varying gain stage feeding into an ADC. The digitized signals are processed in the DSP core using time-varying thresholds for near-field and far-field object detection. The main communication with an external controller will be achieved through the Time Command Interface (TCI) on the IO pins or the 1-wire USART asynchronous interface, or the CMOS-level USART interface on the RXD and TXD pins. The PGA460 can enter an ultra-low quiescent current low-power mode to reduce power consumption during idle periods and can be woken up using commands on the communication interface. The PGA460 also includes system-on-chip diagnostics (which can monitor the transducer voltage, the transducer's frequency, and the decay time during a burst to provide information about the excitation integrity) and power-supply-side and transceiver-side diagnostics for overvoltage, undervoltage, overcurrent, and short-circuit conditions.

• Fully integrated solution for ultrasonic sensing
• Complementary low-side drivers with configurable current limiting, supporting transformer-based and direct-drive topologies for transducer excitation; single transducer for burst/listen, or a transducer pair with one for burst and one for listen operation
• Programmable 6-point time-varying gain (32 to 90 dB) low-noise receiver with DSP for echo envelope detection (BPF, demodulation)
• Two presets of 12-point time-varying thresholds for object detection
• Timer for measuring multi-echo distance and duration
• Integrated temperature sensor
• Recording time for object detection up to 11 m; 128-byte RAM for echo recording
• 42-byte user EEPROM for storing fast initialization configuration
• 1-wire high-voltage time command interface or USART asynchronous interface
• CMOS-level USART interface
• Sensor diagnostics (damping frequency and time, excitation voltage), power supply and transceiver diagnostics

• Ultrasonic Radar
• Object distance and position sensing
• Presence and proximity detection
• Drone and robot landing assistance and obstacle detection
• Occupancy sensors and motion sensors