Wednesday, February 14, 2007

Datasheet Report

Datasheet Report-

Programmable Linear Hall-Effect Sensors

A hall effect sensor is a transducer that varies its output voltage in response to changes in magnetic field density. If an electric current flows through a conductor in a magnetic field, the magnetic field exerts a transverse force on the moving charge carriers which tends to push them to one side of the conductor. This is most evident in a thin flat conductor as illustrated.

A buildup of charge at the sides of the conductors will balance this magnetic influence, producing a measurable voltage between the two sides of the conductor.

[see working theory on wikipedia]


Hall Effect Sensor:
* type: A1373EKB-T (programmable Linear Hall-Effect Sensor)
* manufacturer: Allegro Micro System Inc.

Supply Voltage: 16 V
Reverse Supply Voltage: –16 V
Output Voltage: 16 V
Reverse-Output Voltage: –0.1 V
Output Source Current: 3 mA
Output Sink Current : 10 mA
Operating Ambient Temperature: Range E –40 to 85 oC, Range L –40 to 150 oC
Maximum Junction Temperature: 165 oC
Storage Temperature: –65 to 170 oC

DATASHEET





Key Features Computing Core
* Output pin programming
* Field-programmable for optimal application integration
* Selectable coarse and fine gain and quiescent output voltage
* Selectable sensitivity temperature coefficient
* Selectable output clamp voltage level, including no-clamp (rail-to-rail)
* Selectable output polarity
* Unipolar or bipolar operation
* Ratiometric sensitivity, clamps, and quiescent output voltage
* Chopper-stabilized Hall technique
* Wide operating temperature range
* On-chip regulator for over/under voltage protection
* On-chip regulator provides EMI robustness
* Wide lead-spacing with KB package

This device incorporates a chopper-stabilized amplifier, voltage regulator, programming logic, and an output amplifier on a single IC. The patented dynamic offset cancellation used with a chopper-stabilization technique provides low offset and minimal temperature drift. A high frequency clock is used for chopping, to ensure high frequency signal processing capability.


The design and manufacturing flexibility of the A1373 is emphasized by offering programmable gain, quiescent offset voltage for unipolar or bipolar operation, temperature coefficient, clamps, and polarity. The device can be set up in a magnetic circuit and programmed with a train of serial pulses via the output pin. Once the right combination of gain, quiescent output voltage, and temperature coefficient has been selected, the codes can be locked for one-time programming. In this manner, manufacturing tolerances can be reduced and the assembly process can be simplified.


Application
Hall sensors are used for proximity switching, positioning, speed detection, and current sensing applications. For its accuracy and reliability, its application includes automotive and indtustrial linear position-sensing,such as:

* throttle position sensors
* pedal position sensors
* suspension height sensors



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Note:

Questions:
1) What is the [chopper-stabilized amplifier]?

2)What is [no-clamp (rail-to-rail)]?

3) What is the diagram below telling?


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