Texas Instruments PGA460/PGA460-Q1 Ultrasonic Processor & Driver
Texas Instruments PGA460/PGA460-Q1 Ultrasonic Processor and Driver is a highly integrated system-on-chip ultrasonic transducer driver and a signal conditioner with an advanced DSP core. The device has a complimentary low-side driver pair that can drive a transducer in a transformer-based topology using a step-up transformer or in a direct-drive topology using external high-side FETs. The PGA460/PGA460-Q1 can receive and condition the reflected echo signal for reliable object detection. This feature is accomplished using an analog front-end (AFE) consisting of a low-noise amplifier followed by a programmable time-varying gain stage feeding into an ADC. The digitized signal is then processed in the DSP core for near-field and far-field object detection using time-varying thresholds.
The Texas Instruments PGA460-Q1 variant of this device is AEC-Q100 qualified for use in automotive applications with the following results:
- Device Temperature Grade 2: –40°C to +105°C ambient operating temperature
- Device HBM ESD Classification Level 2
- Device CDM ESD Classification Level C4B
Features
- Fully integrated solution for ultrasonic sensing
- Complimentary low-side drivers with configurable current limit supporting both transformers based and direct drive topology for transducer excitation
- Single transducer for both burst/listen or a transducer pair, one for burst and the other for listen operation
- Low-noise receiver with programmable 6-point time-varying gain (32 to 90dB) with DSP (BPF, demodulation) for echo envelope detection
- Two presets of the 12-point time-varying threshold for object detection
- Timers to measure multiple echo distance and duration
- Integrated temperature sensor
- Record time for object detection up to 11m
- 128 Bytes of RAM for echo recording
- 42 Bytes of user EEPROM to store configuration for fast initialization
- One-wire high-voltage time-command interface or USART asynchronous interface
- CMOS level USART interface
- Sensor diagnostics (Decay frequency and time, excitation voltage), supply, and transceiver diagnostics
Applications
- Ultrasonic radar
- Object distance and position sensing
- Presence and proximity detection
- Drone and robotics landing assist and obstacle detection
- Occupancy and motion sensors
Additional Resources
Functional Block Diagram
Related Development Tools
Texas Instruments PGA460PSM-EVM Proximity-Sensing Evaluation Module
Solution showcasing double-sided printed circuit board (PCB) spacing & requirements for the PGA460.
Texas Instruments BOOSTXL-PGA460 Evaluation Module (EVM)
Enables users to fully evaluate the PGA460-Q1 ultrasonic sensor signal conditioner.
Published: 2017-06-02
| Updated: 2023-10-25