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?

Sensor And Time

This [Sensor And Time] project is created base on the project called [Magic DJ].
I made a series of flex sensors, tuck 4 of them into a bendable transparent plastic tube:
















And then I hooked these sensors on Arduino board, and use processing code from Jamie Allen, to generate waveform diagram of the sensor value, which change by time if you bend the tube filled with flex sensors.

The result of bending diagram:





















[ extend reading about Magic DJ]

Sensor Walk

Flushing Journey

Introduction:
I was in a tour going to flushing from New York City to Flushing, Queens, (close to Shea Stadium as the place of American Open and NY Mets) where a lot of Chinese people live in. We drove a car, heading Chinese mall with Chinese market and food court to buy Chinese snack and enjoy a big meal.






On the way to Flushing, I take some time playing with all the marvelous device originally installed on vehicle. In the central console, I saw the air conditioning system which include a thermo sensor, to detect the temperature inside the car, and command the other part of air conditioning system to adjust the temperature to the one set by passenger. the thermo sensor is installed below the indoor back mirror, where the height is not far from the height of passengers head, which is a reasonable height setting. The air conditioning system work well on the trip and supposedly the sensor work well as well.



The second sensor I found on the car is the anti-pinch window sensor. While you press the button to lift up the window in order to close it, the anti-pinch function would be activated to detect if the window closing process counter any resistant. If the resistant is a little bit to high, obviously there is potential risk, a possibility that passenger's body might be pinched and then cause injury. So if the resistant is higher than certain level, it would be seen that the closing process is dangerous and the process would automatically stop the closing process and go backward to the open status. Some funny guy use a banana to test if the anti pinch function work well, but certainly we don't use that way in an official testing.



One more sensor was found in the car, which is an weight sensor, to detect the weight of passenger in order to modify the car seat position for two reasons:
First, safety reason, concerns the size of passenger to determine the suitable timing of airbag explosion. If the passenger is in a big size, the timing of explosion would be faster, not to let the heat to burn passenger's face. Second, comfort reason, in some luxury car is designed to fit different size of passengers to give them a better support cushion of the seat.




Going to outside of the car, you might easily find the distance sensors on the rear bumper, which is part of the parking assistance system. Those distance sensors would measure the distance from your vehicle to the obstacle behind, and send a signal to the buzzer in your car to remind you that you're too close something in behind.







Another sensor could be found outside the car is the rain drop sensor. In some cars, they have the rain drop sensor, which means if it start raining, the sensor would command the wiper to clean up your wind shield.









The last one I wanna talk about is the anti dazzling light sensor. We know sometimes there is some dazzling light in your back mirror from the car behind you, and make you dazzled and cannot clearly observe the situation of your behind. With the help from anti dazzling sensor, it would detect the dazzling light and change the angle of back mirror to eliminate the driver's
blind spot for safety concern.


Sensors I found:
1. anti-pin window sensor
2. AC thermo sensor
3. distance sensor
4. raindrop sensor
5. anti spotlight sensor
6. weight sensor

See some other sensors in your car: http://images.google.com/imgres?imgurl=http://www.sae.org/automag/techbriefs_04-00/images/02b.jpg&imgrefurl=http://www.sae.org/automag/techbriefs_04-00/02.htm&h=236&w=250&sz=20&hl=en&sig2=vdKqq7JAEiQRLVFAqwwHHQ&start=91&tbnid=SrSaTZ_B58Kr-M:&tbnh=105&tbnw=111&ei=w-TARbGGN4WMggTpjZyUCA&prev=/images%3Fq%3Dpassenger%2Bweight%2Bsensor%26start%3D80%26ndsp%3D20%26svnum%3D10%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN

testing

testing Roger yes sensor workshop blog