PGA460 Ultrasonic Signal Processor and Transducer Driver | TI.com

PGA460 (ACTIVE)

Ultrasonic Signal Processor and Transducer Driver

Ultrasonic Signal Processor and Transducer Driver - PGA460
 

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.

All trademarks are the property of their respective owners.

View more

Parametrics Compare all products in Ultrasonic

 
Number of input channels
Interface
Active Supply Current (Typ) (mA)
Sleep Supply Current (Typ) (uA)
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 PGA450-Q1 PGA460-Q1
1     1     1    
UART / USART
TCI (Time Command Interface)
OWU (One-Wire UART)    
LIN / SCI
UART
GPIO
SPI    
UART / USART
TCI (Time Command Interface)
OWU (One-Wire UART)    
12     5     12    
300       300    
28     18     28    
6     7     6    
Catalog     Automotive     Automotive    
-40 to 105     -40 to 125     -40 to 105    
TSSOP | 16     TSSOP | 28     TSSOP | 16    
16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)     28TSSOP: 62 mm2: 6.4 x 9.7 (TSSOP | 28)     16TSSOP: 32 mm2: 6.4 x 5 (TSSOP | 16)    
1.65 | 1ku     2.60 | 1ku     1.82 | 1ku    
Fully integrated     Fully integrated     Fully integrated