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PGA460 Datasheet Preview

PGA460 Datasheet

Ultrasonic Signal Processor and Transducer Driver

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PGA460
SLASEJ4B – APRIL 2017 – REVISED JANUARY 2019
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 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.
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/
BCM
IO
To MCU
(optional)
100 nF
TXD
RXD
AVDD
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.




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PGA460 Datasheet Preview

PGA460 Datasheet

Ultrasonic Signal Processor and Transducer Driver

No Preview Available !

PGA460
SLASEJ4B – APRIL 2017 – REVISED JANUARY 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 6
6.5 Internal Supply Regulators Characteristics............... 6
6.6 Transducer Driver Characteristics ............................ 6
6.7 Transducer Receiver Characteristics........................ 7
6.8 Analog to Digital Converter Characteristics .............. 7
6.9 Digital Signal Processing Characteristics ................. 7
6.10 Temperature Sensor Characteristics ...................... 7
6.11 High-Voltage I/O Characteristics............................. 7
6.12 Digital I/O Characteristics ....................................... 8
6.13 EEPROM Characteristics........................................ 8
6.14 Timing Requirements .............................................. 8
6.15 Switching Characteristics ........................................ 9
6.16 Typical Characteristics ............................................ 9
7 Detailed Description ............................................ 10
7.1 Overview ................................................................. 10
7.2 Functional Block Diagram ....................................... 11
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 54
7.5 Programming .......................................................... 54
7.6 Register Maps ......................................................... 57
8 Application and Implementation ...................... 105
8.1 Application Information.......................................... 105
8.2 Typical Applications .............................................. 105
9 Power Supply Recommendations.................... 111
10 Layout................................................................. 112
10.1 Layout Guidelines ............................................... 112
10.2 Layout Example .................................................. 112
11 Device and Documentation Support ............... 113
11.1 Documentation Support ...................................... 113
11.2 Receiving Notification of Documentation
Updates.................................................................. 113
11.3 Community Resources........................................ 113
11.4 Trademarks ......................................................... 113
11.5 Electrostatic Discharge Caution .......................... 113
11.6 Glossary .............................................................. 113
12 Mechanical, Packaging, and Orderable
Information ......................................................... 113
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision A (August 2017) to Revision B
Page
• Changed Functional Block Diagram's GND and GNDP pin designators for correct grounding of the Output Driver. ......... 11
• Updated tablenotes of Table 3 ............................................................................................................................................. 38
• Added sentence: USART Synchronous Mode is identical to a Serial Peripheral Interface (SPI) without a chip-select
because the addressing is handled by the three-bit UART_ADDR value to enable up to eight devices on a single bus. .. 43
• Added sentence: The temperature measurement's sample and conversion time requires at least 100 us after the
temperature measurement command is issued. Do not send other commands during this time to allow the
temperature value to properly update................................................................................................................................... 51
Changes from Original (April 2017) to Revision A
Page
• Added zero padding information to the CONFIGURATION/STATUS Command section.................................................... 32
• Changed UART interface parameter text from: 1 stop bit to: 2 stop bit .............................................................................. 34
• Changed interfield wait time text from: optional to: required for 1 stop bit ........................................................................... 34
• Added sentence: The sync field (0x55) is not included as part of the checksum calculation. ............................................. 37
• Updated content and added tablenotes to Table 3 .............................................................................................................. 38
• Added sentence: The diagnostic field is included in the slave generated checksum calculation. ...................................... 41
• Added subsection Direct Data Burst Through USART Synchronous Mode......................................................................... 47
• Added Equation 8 ................................................................................................................................................................. 52
• Added sentence: This includes all threshold timing and level values. ................................................................................ 54
• Updated UART and USART Communication Examples content ......................................................................................... 57
• Updated content in Table 101 ........................................................................................................................................... 107
• Added content to Application Curves ................................................................................................................................. 109
2 Submit Documentation Feedback
Product Folder Links: PGA460
Copyright © 2017–2019, Texas Instruments Incorporated


Part Number PGA460
Description Ultrasonic Signal Processor and Transducer Driver
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