PGA460 Ultrasonic signal processor and transducer driver | TI.com

PGA460
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Ultrasonic signal processor and transducer driver

 

Description

The PGA460 device is a highly-integrated system on-chip ultrasonic transducer driver and signal conditioner with an advanced DSP core. The device has a complimentary low-side driver pair that can drive a transducer either in a transformer based topology using a step-up transformer or in a direct-drive topology using external high-side FETs. The device 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 processed in the DSP 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-command interface (TCI) or a one-wire USART asynchronous interface on the IO pin, or a CMOS-level USART interface on the RXD and TXD pins. The PGA460 can be put in ultra-low quiescent current low-power mode to reduce power consumption when not in use and can be woken up by commands on the communication interfaces.

The PGA460 also includes on-chip system diagnostics which monitor transducer voltage during burst, frequency and decay time of transducer to provide information about the integrity of the excitation as well as supply-side and transceiver-side diagnostics for overvoltage, undervoltage, overcurrent and short-circuit scenarios.

Features

  • 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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Parametrics

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Part number Order Number of input channels Interface Supply voltage (Max) Supply voltage (Min) Rating Operating temperature range (C) Package Group Package size: mm2:W x L (PKG) Approx. price (US$) Features
PGA460 Order now 1     UART / USART
TCI (Time Command Interface)
OWU (One-Wire UART)    
28     6     Catalog     -40 to 105     TSSOP | 16     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     1.95 | 1ku     Fully integrated    
PGA450-Q1 Order now 1     LIN / SCI
UART
GPIO
SPI    
18     7     Automotive     -40 to 125     TSSOP | 28     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     2.60 | 1ku     Fully integrated    
PGA460-Q1 Order now 1     UART / USART
TCI (Time Command Interface)
OWU (One-Wire UART)    
28     6     Automotive     -40 to 105     TSSOP | 16     16TSSOP: 22 mm2: 4.4 x 5 (TSSOP | 16)     2.15 | 1ku     Fully integrated