E524.08 Datasheet, PDF (1/2 Pages) ELMOS Semiconductor AG – 2nd Generation Ultrasonic Transducer Driver and Signal Processor

2nd Generation Ultrasonic Transducer Driver and Signal Processor
PRODUCT PREVIEW – Sep 17, 2015
E524.08 / E524.09
Features
• Bi-directional interface in 2-wire & 3-wire variants
• Programmable transducer frequencies between
30kHz and 83kHz
• Programmable driver power and receiver gain
• Excellent short & long range performance due to:
• Wide signal gain range
• Sensitivity time control
• Automatic threshold generation
• Near-field threshold generation
• Fast time constant algorithm
• Echo peak detection
• Flexible IO protocol
• Transducer diagnosis information
• Integrated temperature sensor
• Envelope readout via IO or testmode
• Embedded EEPROM for calibration data
• Chip ID for traceability
Applications
• Ultrasonic park assist systems (USPA, PAS, ...)
• Industrial distance measuring
Ordering Information
Product ID
E524.08
E524.09
Temp. Range
-40°C to +105°C
-40°C to +105°C
Interface
2-wire
3-wire
Package
QFN20L4
QFN20L4
General Description
The device builds the core for a robust and easy-to-handle
distance measurement system, while offering flexibility for
customer applications.
A driver unit stimulates the ultrasonic transducer via a center
tapped transformer. Driver frequency, transmitted burst
power and other parameters are user configurable.
The received echo signal is amplified, converted and digitally
processed. Customized obstacle interpretation is feasible by
a variable detection threshold. A flexible IO protocol com-
bined with STC (Sensitivity time control), ATG (Automatic
threshold generation), NFTG (Near-field threshold genera-
tion), FTC algorithm and EPD (Echo peak detection) optimize
short and long range performance.
Application relevant settings can be stored in EEPROM during
an End-Of-Line calibration by the customer. For evaluation
and debugging purposes, envelope and threshold data can be
read out via test mode and additionally the envelope data
can be read out via IO line as an analog curve.
Communication with the control unit is possible via 2-wire or
3-wire configuration. The E524.08 supports a bi-directional
communication via data modulation on the supply line. The
E524.09 supports a dedicated IO-line for data transfer.
Typical Operating Circuit
ECU
Sensor module
ECU
Sensor module
TR1
DRV1 DRVS DRV2
GNDP
CAIN1
AING
AINS
VSUP_DATA ^RSUP
RTANK
VTANK
DSUP
CSUP3
VSUP
GND
CSUP1 CSUP2
RIO_S
IO
CIO
E524.08
VDDD
GNDD
VDDA
GNDA
CVDDD
CVDDA
TR1
DRV1 DRVS DRV2
GNDP
CAIN1
AING
AINS
Ultrasonic
transducer
RTANK
VTANK
VSUP_LINE ^{RSUP DSUP}
CSUP3
VSUP
GND
DATA
CSUP1 CSUP2
RPU
RIO_S
IO
CIO1
CIO2
E524.09
VDDD
GNDD
VDDA
GNDA
CVDDD
CVDDA
This document contains information on a product under development. Elmos Semiconductor AG reserves the right to change or discontinue this product without notice.
Elmos Semiconductor AG
QM-No.: 25IS0138E.01