This
ultra low power, miniaturized (down to 1.7"x1.7"x 1.1"),
and multi-functional Smart Sensor provides high performance functions
with (i) robust data acquisition, (ii) IEEE 1451 software stack
(standard communication protocol, fault detection awareness, and
TEDS management); (iii) flexible on-board communications (I2C, UART,
IrDA, SPI, and RS232); and (iv) wireless communications (Zigbee).
Main features and smart node specifications as well as a list of
supported IEEE 1451 commands are listed in the tables below. Building
on the baseline features, the CRE-SSN can be customized (optional)
for hosting embedded intelligent functions such as:
- Health monitoring
by processing signals from the attached transducers (single unit
or suites) and feeding pattern recognition software
- Valid data generation
by sensor self-diagnostics
- Calibration
- Self-identification
Designed for Operating Within the IEEE 1451 Standard
Feature |
Specification |
CPU |
RISC (16 bits) with Hardware
Multiplier |
Immunity
to power voltage changes |
Internal modules are designed
to operate properly within an input voltage ranging from 1.8
to 3.6v |
Clock
|
4 MHz (up to 16) |
Program
Memory |
116 KB + 256B Flash Memory |
RAM |
8 KB |
Timers |
2, three outputs available
for PWM control and event period measurement |
DMA |
Three-Channel |
Standard
Ports |
JTAG and RS-232 (2 row connector) |
Powering |
3 configurable sources: (a)
AC/DC (12v); (b) battery; and (c) customizable source |
ADC
|
Up to 200 Ksps, 7 channels,
programmable S&H timing, and 4 core configurable sampling
modes |
Dimensions
|
1.7 x 1.7 x 1.1 " (approximately
w/o casing) |
Available
in the Expansion Connector and Expansion Board |
Digital
Input/Output |
16 interfacing signals (GPIO,
ADC-channels, timer, communications) |
ADC |
12-bit (up to 7 external channels) |
DAC |
2 |
Standard
Communications |
USC1 allows UART, IrDA, and
SPI communications. UCB0 for I2C interface |
CRE-SSN - Main
Specifications
WTIWTIM
or TCh StateM or TCh State |
DDot0 Commandot0
Command |
WTIM
active
TCh in any state |
Query TEDS |
Read TEDS segment |
Write TEDS segment |
Update TEDS |
Run Self-Test |
Write Service request mask |
Read Service request mask |
Read Status-event register |
Read Status-condition register |
Clear status-event register |
Write status-event protocol
state |
TCh
in Idle State |
AddressGroup
definition |
Sampling
Mode |
Calibrate
Transducer Channel |
TCh
in Operating State |
Read TransducerChannel data-set segment |
Write TransducerChannel data-set segment |
Trigger command |
TCh
either Idle or Operating state |
TransducerChannel Operate |
TransducerChannel Idle |
Write TransducerChannel Trigger State |
WTIM Sleep |
Wake-up |
WTIM
Active State |
Read TIM version |
WTIM Sleep |
Read Dot0 version |
Any
State |
Reset |
Supported IEEE 1451 Commands
The CRE-SSN is a
low cost product that can be used as a smart sensor testing node
with advanced & embedded processing, flexible communication
modules, and low power consumption. An MMI provides a fast way to
set up networks of CRE-SSNs, but also an available Application Programming
Interface (API) allows custom software design. Sensor suites are
customizable for containing up to 5 different types of sensors per
module. Within the IEEE 1451 framework, the Zigbee baseline communication
module can be replaced for other types, including IEEE 802.11.x
and Bluetooth (under request). Systems can be deployed in a modular
way (rail mounting) by stacking several modules along with a power
module (that serves several nodes). For distributed configurations,
each CRE-SSN requires a complementary power module for standalone
operation. The CRE-SSN enables customization and flexibility to
configure the module with required sensor suites (selected according
to the application when placing the order).
CRE-SSN Block Diagram
Baseline Modular Enclosure Dimensions
Systems can be implemented
by CRE-SSN networks with new transducers but also existing sensors
can be retrofitted with this node for enhancing system capabilities.
Available options include vibration and general purpose transducers.
Structural
Health Monitoring Vibration Transducer Options:
• coremicro®
Reconfigurable Embedded - Smart Sensor Node for Vibration Measurement
(CRE-SSNF) For extracting vibration information two baseline
transducer types are available providing Structural Health Monitoring
capability. Rugged accelerometers allow monitoring machinery (such
as motors and pumps) vibration levels and track vibration signatures
associated with specific events (failures) during operational conditions.
PZT elements can be bonded to structure surfaces to measure strain
and vibration.
General
Purpose Transducer Options:
To
provide tracking capability of physical parameters in a monitoring
system (such as Condition Base Maintenance and Health Monitoring
type systems) general purpose transducers are available to obtain
single measurement or measurement sets (by configuration of sensor
suites). Available options are:
- coremicro® Reconfigurable Embedded - Smart Sensor Node for
Flow Measurement (CRE-SSNF) based on a hall effect sensor that
delivers a square signal, used for measuring rate flows for a
low cost and ultra low power solution.
- coremicro® Reconfigurable Embedded - Smart Sensor Node for
Temperature Measurement (CRE-SSNTRTD1) baseline is based on accurate
RTD sensors. Combined with embedded calibration functions and
TEDS the CRE-SSNTRTD1 is a product that can be used with advanced
Condition Base Maintenance and provides the same functionality
even with CBM software updates. Customizable for other operational
ranges and requirements.
- coremicro® Reconfigurable Embedded - Smart Sensor Node for
Pressure Measurement (CRE-SSNP-1) baseline pressure sensor provides
a range of 500 psig with an output signal between 0.5 to 4.5.
It requires a supply current with a maximum value of 15 mA. The
sensor is designed for a pressure overload of two times the normal
range (minimum) with an output load of 1 MO. Customizable for
other operational ranges and requirements.
Custom
Sensors:
AGNC
provides diversified design services to meet specific requirements
in advanced applications. Custom design services are also provided.
Please contact us for more information.
Systems Health-Monitoring Design Services
Network
of CRE-SSNs enable distributed hardware platforms, which can be
complemented with AGNC's software toolsets for a fully intelligent
system suitable in high performance health monitoring applications.
Advanced analysis tools include: Optimized Neuro Genetic Fast Estimator
(ONGFE) for designing Artificial Neural Networks; Real-Time Kernels
for feature extraction (time and frequency domain as well as wavelet
analysis); and custom GUIs for complete system visualization and
analysis. This full set of capabilities has been demonstrated successfully
in NASA and DoD applications.
CRE-SSN
Brochure
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