TUSS4440 Sensor Datasheet

TUSS4440 Datasheet, PDF, Equivalent


Part Number

TUSS4440

Description

Transformer Drive Ultrasonic Sensor

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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TUSS4440
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TUSS4440
SLDS250 – DECEMBER 2019
TUSS4440 Transformer Drive Ultrasonic Sensor IC With Logarithmic Amplifier
1 Features
1 Integrated driver for transformer driven
transducers and receiver stage with analog output
for ultrasound applications
• 86-dB input dynamic range analog front-end
– First stage low noise amplifier adjustable to 10,
12.5, 15 and 20 V/V
– Configurable bandpass filter from 40 KHz to
500 KHz
– Wide-band logarithmic amplifier
• Supported transducer frequencies (controlled by
external clock)
– 40 KHz to 400 KHz
• For low-power applications
– Standby mode: 1.7 mA (typical)
– Sleep mode: 220 µA (typical)
• Configurable drive stage:
– Complimentary low-side drivers with current
limit for transformer based transducer
excitation
– Configurable burst patterns using IO1 and IO2
pins
• Outputs:
– Voltage output of the demodulated echo
envelope on VOUT
– Input signal zero crossing comparator output
on OUT3 pin
– Programmable VOUT threshold crossing on
OUT4 pin
• Serial Peripheral Interface (SPI) for configuration
by microcontroller (MCU)
2 Applications
Position sensor
Level transmitter
Proximity sensor
3 Description
The TUSS4440 is a highly integrated transformer
drive analog front end for industrial ultrasonic
applications. The transducer drive stage consists of
low-side complementary drivers that can be
configured to drive an ultrasonic transducer through a
step-up transformer. The device delivers constant
current to the primary side of the transformer.
The receive signal path includes a low-noise linear
amplifier, a bandpass filter, followed by a logarithmic
gain amplifier for input dependent amplification. The
logarithmic amplifier allows for high sensitivity for
weak echo signals and offers excellent input dynamic
range over full range of reflected echoes.
The drivers can be controlled directly through the
microcontroller for complete customization of the
burst signal, or can be programmed through SPI with
a customizable burst length. The TUSS4440 can
support a single transducer to send and receive burst
signals, or can set up two transducers to split the
send and receive functions.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TUSS4440
WQFN (20)
4.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
TUSS4440 Application Diagram
D1
VIN >
RPWR
CPWR1
MCU
GPIO
GPIO
GPIO
SPI
LDO
ADC
CVDD
IO2
IO1
OUT3
OUT4
NCS
SDO
SDI
SCLK
VOUT
VDD
OUTA
VDRV
OUTB
FLT
CFLT CPWR2
CT RT
XDCR
INP
INN
CINP
RINP
CINN
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.

TUSS4440
TUSS4440
SLDS250 – DECEMBER 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 ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information ................................................. 5
6.5 Power-Up Characterstics .......................................... 5
6.6 Transducer Drive ..................................................... 5
6.7 Receiver Characteristics ........................................... 6
6.8 Echo Interrupt Comparator Characteristics............... 7
6.9 Digital I/O Characteristics ......................................... 7
6.10 Switching Characteristics ........................................ 7
6.11 Typical Characteristics ............................................ 8
7 Detailed Description ............................................ 11
7.1 Overview ................................................................. 11
7.2 Functional Block Diagram ....................................... 11
7.3 Feature Description................................................. 12
7.4 Device Functional Modes........................................ 21
7.5 Programming .......................................................... 22
7.6 Register Maps ........................................................ 24
8 Application and Implementation ........................ 30
8.1 Application Information............................................ 30
8.2 Typical Application ................................................. 30
9 Power Supply Recommendations...................... 37
10 Layout................................................................... 38
10.1 Layout Guidelines ................................................. 38
10.2 Layout Example .................................................... 39
11 Device and Documentation Support ................. 40
11.1 Receiving Notification of Documentation Updates 40
11.2 Support Resources ............................................... 40
11.3 Trademarks ........................................................... 40
11.4 Electrostatic Discharge Caution ............................ 40
11.5 Glossary ................................................................ 40
12 Mechanical, Packaging, and Orderable
Information ........................................................... 40
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
DATE
December 2019
REVISION
*
NOTES
Initial release.
2 Submit Documentation Feedback
Product Folder Links: TUSS4440
Copyright © 2019, Texas Instruments Incorporated


Features Product Folder Order Now Technical Doc uments Tools & Software Support & Com munity TUSS4440 SLDS250 – DECEMBER 2 019 TUSS4440 Transformer Drive Ultrason ic Sensor IC With Logarithmic Amplifier 1 Features •1 Integrated driver for transformer driven transducers and rec eiver stage with analog output for ultr asound applications • 86-dB input dyn amic range analog front-end – First s tage low noise amplifier adjustable to 10, 12.5, 15 and 20 V/V – Configurabl e bandpass filter from 40 KHz to 500 KH z – Wide-band logarithmic amplifier Supported transducer frequencies (co ntrolled by external clock) – 40 KHz to 400 KHz • For low-power applicatio ns – Standby mode: 1.7 mA (typical) Sleep mode: 220 µA (typical) • Co nfigurable drive stage: – Complimenta ry low-side drivers with current limit for transformer based transducer excita tion – Configurable burst patterns us ing IO1 and IO2 pins • Outputs: – V oltage output of the demodulated echo envelope on VOUT – Input signal zero crossing comparator o.
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