|Package | PIN:||TSSOP (PW) | 16|
|Temp:||T (-40 to 105)|
- Fully Integrated Solution for Ultrasonic Sensing
- Complimentary Low-Side Drivers With Configurable Current Limit Supporting Both Transformer 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 90 dB) With DSP (BPF, Demodulation) for Echo Envelope Detection
- Two Presets of 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 11 m
- 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.
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Texas Instruments PGA460TPWR
The PGA460 device is a highly-integrated system on-chip ultrasonictransducer driver and signal conditioner with an advanced DSP core. The device has a complimentarylow-side driver pair that can drive a transducer either in a transformer based topology using astep-up transformer or in a direct-drive topology using external high-side FETs. The device canreceive and condition the reflected echo signal for reliable object detection. This feature isaccomplished using an analog front-end (AFE) consisting of a low-noise amplifier followed by aprogrammable time-varying gain stage feeding into an ADC. The digitized signal is processed in theDSP core for both near-field and far-field object detection using time-varying thresholds.
The main communication with an external controller is achieved by either a time-commandinterface (TCI) or a one-wire USART asynchronous interface on the IO pin, or a CMOS-level USARTinterface on the RXD and TXD pins. The PGA460 can be put in ultra-lowquiescent current low-power mode to reduce power consumption when not in use and can be woken up bycommands on the communication interfaces.
The PGA460 also includes on-chip system diagnostics which monitortransducer voltage during burst, frequency and decay time of transducer to provide informationabout the integrity of the excitation as well as supply-side and transceiver-side diagnostics forovervoltage, undervoltage, overcurrent and short-circuit scenarios.