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A1469LK

Three-Wire True Zero-Speed Differential Peak-Detecting Sensor IC with Continuous Calibration

Allegro MicroSystems 

A1469

Three-Wire True Zero-Speed Differential Peak-Detecting

Sensor IC with Continuous Calibration

FUNCTIONAL DESCRIPTION

Sensing Technology

The single-chip differential Hall effect sensor IC possesses two

Hall elements, which sense the magnetic profile of the ring mag-

net simultaneously, but at different points (spaced at a 2.2 mm

pitch), generating a differential internal analog voltage, VPROC ,

that is processed for precise switching of the digital output signal.

The Hall IC is self-calibrating and also possesses a temperature

compensated amplifier and offset compensation circuitry. Its

voltage regulator provides supply noise rejection throughout the

operating voltage range. Changes in temperature do not greatly

affect this device due to the stable amplifier design and the offset

compensation circuitry. The Hall transducers and signal process-

ing electronics are integrated on the same silicon substrate, using

a proprietary BiCMOS process.

Target Profiling

An operating device is capable of providing digital information

that is representative of the magnetic features on a rotating target.

The waveform diagram shown in Figure 3 presents the automatic

translation of the magnetic profile to the digital output signal of

the device.

Output Polarity

Figure 3 shows the output polarity for the orientation of target

and device shown in Figure 2. The target direction of rotation

shown is: perpendicular to the leads, across the face of the device,

from the pin 1 side to the pin 4 side. This results in the device

output switching from low to high as the leading edge of a north

magnetic pole passes the device face. In this configuration, the

device output voltage switches to its high polarity when a north

pole is the target feature nearest to the device. If the direction of

rotation is reversed, then the output polarity inverts.

Target

(Ring Magnet)

S

N

S

N

Element Pitch

Hall Element 2

Rotating(PTianrg4et Side)

Hall Element 1

Hall IC

(PinoBf1raLnSPdiaedcdekFa)agcee

Figure 1:S RN SelNative MoStiNoSnN of the Target

The relative motion of the target is detected by the dual Hall elements

mounted on tPhien H1 all IC. Pin 4

Rotating Target

Branded Face

of K Package

SNS N

S NSN

Pin 1

Pin 4

Figure 2: Target Rotation

This left-to-right (pin 1 to pin 4) direction of target rotation results

in a high output signal when a target north pole is nearest the face

of the device (see Figure 3). A right-to-left (pin 4 to pin 1) rotation

inverts the output signal polarity.

Allegro MicroSystems, LLC

8

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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