ATS612LSB Datasheet, PDF (1/16 Pages) Allegro MicroSystems – DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING, DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR

ATS612LSB
1
2
3
4
Pin 1 = Supply
Pin 2 = Output
Pin 3 = Capacitor
Pin 4 = Ground
Dwg. AH-006
ABSOLUTE MAXIMUM RATINGS
over operating temperature range
Supply Voltage, V_CC ............................... 24 V*
Reverse Supply Voltage, V_RCC .............. -16 V
Output OFF Voltage, V_OUT ....................... 24 V
Continuous Output Current, I_OUT ...... 25 mA†
Reverse Output Current, I_ROUT ............ 50 mA
Package Power Dissipation,
P_D .......................................... See Graph
Operating Temperature Range,
T_A ................................. -40°C to +150°C*
Storage Temperature, T_S .................. +170°C
* Operation at increased supply voltages with
external circuitry is described in Applications
Information. Devices for operation at increased
temperatures are available on special order.
† Output is current limited at 25 mA to 55 mA.
Continued operation in this mode can cause
excessive device heating and failure. See graph,
next page.
DYNAMIC, SELF-CALIBRATING,
PEAK-DETECTING, DIFFERENTIAL
HALL-EFFECT GEAR-TOOTH SENSOR
The ATS612LSB gear-tooth sensor is a peak detecting device that
uses automatic gain control to provide extremely accurate gear edge
detection down to low operating speeds. Each sensor module consists
of a high-temperature plastic shell that holds together a samarium-
cobalt magnet, a pole piece, and a differential open-collector Hall IC
that has been optimized to the magnetic circuit. This small package
can be easily assembled and used in conjunction with a wide variety of
gear shapes and sizes.
The gear-sensing technology used for this sensor is Hall-effect
based. The sensor incorporates a dual-element Hall IC that switches in
response to differential magnetic signals created by ferrous targets.
The sophisticated processing circuitry contains a 5-bit A/D converter
that self-calibrates (normalizes) the internal gain of the device to
minimize the effect of air-gap variations. The patented peak-detecting
filter circuit eliminates magnet and system offsets and has the ability to
discriminate relatively fast changes such as those caused by tilt, gear
wobble, and eccentricities yet provides stable operation to extremely
low RPM.
These sensor systems are ideal for use in gathering speed, posi-
tion, and timing information using gear-tooth-based configurations. The
ATS612LSB is particularly suited to those applications that require
extremely accurate duty cycle control or accurate edge detection such
as in automotive crank shaft applications. The lower vibration sensitiv-
ity also makes this device extremely useful for transmission speed
sensing.
ATS612LSB: Large/small-tooth gear-position sensing —
crank angle, transmission speed, cam angle.
continued next page…
Always order by complete part number: ATS612LSB .