ATS611LSB datasheet(9/16 Pages) ALLEGRO

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ATS610LSA AND ATS611LSB

DYNAMIC, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT

GEAR-TOOTH SENSORS

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DEVICE DESCRIPTION

The ATS610LSA and ATS611LSB dynamic,

peak-detecting, differential Hall-effect gear-tooth sensors

are Hall IC plus magnet modules that are fully optimized

to provide digital detection of gear-tooth edges in a small

package size. Both sensors are packaged in identical

miniature plastic housings that have been optimized for

size, ease of assembly, and manufacturability. High operat-

ing temperature materials are used in all aspects of

construction.

The application of these sensors is uncomplicated.

After power is applied to the device, they are capable of

quickly providing digital information that is representative

of a rotating gear or specially designed target. No addi-

tional optimization or processing circuitry is required. This

ease of use should reduce design time and incremental

assembly costs for most applications.

Sensing Technology. Both gear-tooth sensor modules

contain a single-chip differential Hall-effect sensor IC, a

samarium-cobalt magnet, and a flat ferrous pole piece.

The Hall IC consists of two Hall elements spaced 2.235

mm (0.088") apart, which sense the magnetic gradient

created by the passing of a ferrous object (a gear tooth).

The two Hall voltages are compared and the difference is

then processed to provide a digital output signal.

The processing circuit uses a patented peak-detection

technique to eliminate magnet and system offsets. This

technique allows coupling and filtering of offsets without

the power-up and settling time disadvantages of classical

high-pass filtering schemes. Here, the peak signal of

every tooth and valley is detected and is used to provide

an instant reference for the operate-point and release-

point comparators. In this manner, the thresholds are

adapted and referenced to individual signal peaks and

valleys, thereby providing immunity to zero-line variation

due to installation inaccuracies (tilt, rotation, and

off-center placement), as well as for variations caused by

target and shaft eccentricities. The peak detection

concept also allows extremely low-speed operation when

used with small-value capacitors.

Dwg. WH-011

OUT(SAT)

OPERATE

RELEASE

OPERATE

RELEASE

Power-On Operation. The device will power on in the

OFF state (output high) irrespective of the magnetic field

condition. The power-on time of the circuit is no greater

than 200

µs. The circuit is then ready to accurately detect

the first target edge that results in a HIGH-to-LOW transi-

tion.

Under-Voltage Lockout. When the supply voltage is

below the minimum operating voltage (VCC(UV)), the device

is OFF and stays OFF irrespective of the state of the

magnetic field. This prevents false signals, which may be

caused by under-voltage conditions (especially during turn

on), from appearing at the output.

Output. The device output is an open-collector stage

capable of sinking 25 mA. An external pull-up (resistor) to

a supply voltage of not more than 18 V must be supplied.

Superior Performance. The ATS610LSA and

ATS611LSB peak-detecting differential gear-tooth sen-

sors have several advantages over conventional

Hall-effect gear-tooth sensors.

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