Ultrasonic Signal Processor and Transducer Driver - PGA460

PGA460 (ACTIVE)

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 Compare all products in Ultrasonic Sensing

 
# 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$)
Special 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    TSSOP    TSSOP   
16TSSOP: 32 mm2: 6.4 x 5(TSSOP)    28TSSOP: 62 mm2: 6.4 x 9.7(TSSOP)    16TSSOP: 32 mm2: 6.4 x 5(TSSOP)   
1.65 | 1ku    2.60 | 1ku    1.82 | 1ku   
Fully integrated    Fully integrated    Fully integrated   

Other qualified versions of PGA460

Version Part Number Definition
Automotive PGA460-Q1 Q100 devices qualified for high-reliability automotive applications targeting zero defects

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