ATS625LSG Datasheet, PDF (1/21 Pages) Allegro MicroSystems – True Zero-Speed Low-Jitter High Accuracy Gear Tooth Sensor

ATS625LSG
True Zero-Speed Low-Jitter
High Accuracy Gear Tooth Sensor
Features and Benefits
▪ Highly repeatable over operating temperature range
▪ Tight timing accuracy over operating temperature range
▪ True zero-speed operation
▪ Air-gap–independent switchpoints
▪ Vibration immunity
▪ Large operating air gaps
▪ Defined power-on state
▪ Wide operating voltage range
▪ Digital output representing target profile
▪ Single-chip sensing IC for high reliability
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Package: 4 pin SIP (suffix SG)
Description
The ATS625 true zero-speed gear tooth sensor is an optimized
Hall IC and magnet configuration packaged in a molded module
that provides a manufacturer-friendly solution for digital gear
tooth sensing applications. The sensor assembly consists of an
over-molded package that holds together a samarium cobalt
magnet, a pole piece concentrator, and a true zero-speed Hall
IC that has been optimized to the magnetic circuit. This small
package can be easily assembled and used in conjunction with
gears of various shapes and sizes.
The sensor incorporates a dual-element Hall IC that switches
in response to differential magnetic signals created by a ferrous
target. Digital processing of the analog signal provides zero-
speed performance independent of air gap as well as dynamic
adaptation of device performance to the typical operating
conditions found in automotive applications (reduced vibration
sensitivity). High-resolution peak detecting DACs are used to
set the adaptive switching thresholds of the device. Switchpoint
hysteresis reduces the negative effects of any anomalies in
the magnetic signal associated with the targets used in many
automotive applications. This sensor system is optimized
Not to scale
V+
VCC
0.1 F
C_BYPASS
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Functional Block Diagram
Voltage
Regulator
Hall
Amp
Automatic
Gain
Control
V_PROC
PDAC
NDAC
PPeak
NPeak
Reference
Generator
PThresh
NThresh
Threshold
Comparator
Threshold
Logic
ATS625LSG-DS, Rev. 2
GND
(Recommended)
AUX
Current
Limit
Output
Transistor
VOUT