♪ Control ♪
Hello.
Today we're demonstrating the revolutionary new
SM324-10E Smart TMR Magnetometer.
This device combines the precision of Tunneling Magnetoresistance
with sophisticated Digital Signal Processing.
The evaluation kit has a demo board, and
a powerful, intuitive graphic user interface.
The kit comes with a small magnet.
As we move the magnet closer,
the digital output turns on, as indicated by the red LED.
The threshold can be set via the sensor's I²C interface.
It can detect strong magnets more than 150 millimeters away.
And it detects polarity.
The SM324 can also be used as a noncontact current sensor.
When we run a current
through the trace on the demo board,
we can see the sensor output on the computer.
Here the sensor digital output-- the red LED--turns on,
indicating overcurrent, which we set to 75% of full scale,
or about four amps.
the digital output threshold can be adjusted
on the "Settings" tab of the user interface.
There's a "Memory" tab
that lets us look at the sensor memory,
and a "Comm/I²C" tab to configure communications.
At 300 samples per second, it's fast enough
to monitor a DC motor like this windshield washer pump.
We have a simulated washer fluid tank.
As we increase the voltage to the motor,
the current increases.
Suppose we run out of fluid, the hose kinks,
or the outflow's plugged.
The current decreases.
We've set an inverted threshold so the the red LED goes on
when there's a fault.
The demo board has:
• the sensor element
over a current-carrying trace;
• an LED showing the digital threshold output;
• there's a microcontroller to interface
from the sensor I²C to USB to connect to a computer;
• an isolated power supply-- external or USB powered;
• and connectors.
The SM324 sensor has:
• a TMR sensor element;
• an 18-bit ADC with 24-bit calculations;
• second-order linearization;
• a calibrated temperature sensor and temperature compensation;
• nonvolatile calibration memory;
• an I²C interface; and
• a digital threshold output.
SM324 features and specifications include:
• 0 to ±20 Oe magnetic field operating range,
so it can detect magnets more than 50 mm away;
• accuracy of ±0.3% of full scale;
• an I²C interface to connect to almost any microcontroller;
• 300 samples/second conversion rate;
• wide supply range • low supply current
• the full industrial / automotive temperature range;
• and it's ultraminiature
Call, click, or e-mail us for more information,
or to buy SM324 sensors and eval kits.
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