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GMR Switch Precision Digital Sensors
AD8xx-xx to AD9xx-xx
Features:
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Short Circuit Detection and Shutoff of External Power Transistor
Precision Magnetic Operate Point
Excellent Temperature and Voltage Performance
Digital Outputs
Frequency Response 0 to 250kHz
Small, Low-Profile Surface Mount Packages
Applications:
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General Digital Position Sensing
Pneumatic Cylinder Position Sensing
Speed Sensing
Description:
NVE AD8xx and AD9xx GMR Switches are designed specifically for use with an external high
current output transistor in industrial control environments. These parts provide the same precise
magnetic performance NVE’s GMR Switch is known for with the additional functionality of short
circuit protection (SCP) for the output stage of the circuit. The protection circuit is designed to shut off
the output stage when a short circuit condition exists. After a user-specified time interval, the circuit
turns back on. If the short circuit condition still exists, the output stage is again shut off and the cycle
repeats. This sensor, along with external reverse battery protection and overvoltage protection, results
in a “bulletproof” sensor assembly. A functional block diagram of this sensor is shown below:
VDD
GMR
Bridge
Comparator
Vreg
Sink1
Comparator
ShortH
Sink2
Cap2
Cap
SCP Turn
On Delay
Off State
Timer
Ground
These digital sensors with SCP are available for use with current sinking or current sourcing outputs,
in a range of magnetic field operate points. They are provided in an MSOP8 package with the cross-
axis direction of sensitivity. An LED driver to indicate the presence of the magnetic field is also
standard on these products. An SOIC8 package and standard axis sensitivity are available on a special
order basis.
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www.nve.com phone: 952-829-9217 fax: 952-829-9189
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