PGA460 Datasheet, PDF (1/114 Pages) Texas Instruments – Ultrasonic Signal Processor and Transducer Driver

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PGA460
SLASEJ4 – APRIL 2017
PGA460 Ultrasonic Signal Processor and Transducer Driver
1 Features
•1 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 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.
3 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.
2 Applications
• Ultrasonic Radar
• Object distance and Position Sensing
• Presence and Proximity Detection
• Drone and Robotics Landing Assist and Obstacle
Detection
• Occupancy and Motion Sensors
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
PGA460
TSSOP (16)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Diagram (Transformer Drive)
VIN
100 nF
VPWR
To ECU/
IO
BCM
To MCU
(optional)
TXD
RXD
AVDD
100 nF
IOREG
100 nF
GND
OUTA
CT
OUTB
INP
INN
DECPL
GNDP
100 …F
C(INP)
C(INN)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.