AD8xx-xx to AD9xx-xx
AD8xx-xx to AD9xx-xx
Features:
? 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:
? 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 NVEs 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 time interval specified by the user, the circuit turns back on. If
the short circuit condition still exists, the output stage is again shut off and the cycle
repeats. The use of 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
Vreg
GMR
Bridge
Sink1
Sink2
ShortH
Cap2
SCP Turn
On Delay
Cap
Off State
Timer
Ground
Comparator
Comparator
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
NVE Corporation 11409 Valley View Road, Eden Prairie, Minnesota 55344 USA
(800) 467-7141 Web: www.nve.com
Email: info@nve.com
11/15/02
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