ATS468 Datasheet, PDF (1/15 Pages) Allegro MicroSystems – Wide operating voltage range

ATS468
Three-Wire True Zero-Speed Differential Peak-Detecting
Sensor IC with Continuous Calibration
FEATURES AND BENEFITS
• Wide operating voltage range
• Peak detecting algorithm robust against signal
perturbations
• Capable of sensing a wide range of target types
• Running mode calibration for continuous optimization
• Single chip IC for high reliability
• Precise duty cycle signal throughout operating
temperature range
• Large operating air gaps
• Automatic Gain Control (AGC) for air-gap–independent
switchpoints
• Automatic Offset Adjustment (AOA) for signal
processing optimization
• True zero-speed operation
Continued on the next page…
Packages:
4-Pin SIP (suffix SG)
4-Pin SIP (suffix SJ)
DESCRIPTION
TheATS468 is a true zero-speed gear tooth sensor IC consisting
of an optimized Hall IC and a permanent magnet pellet
configuration in a single overmolded package. The integrated
circuit provides a manufacturer-friendly solution for digital
gear tooth sensing applications. This small package can be
easily assembled and used in conjunction with gears of various
shapes and sizes.
The integrated circuit incorporates dual Hall effect elements
with a 2.2 mm spacing and signal processing that switches
in response to differential magnetic signals created by a
ferromagnetic target. The circuitry contains a sophisticated
digital circuit to reduce system offsets, to calibrate the gain for
air-gap–independent switchpoints, and to achieve true zero-
speed operation. Signal optimization occurs at power-on through
the combination of offset and gain adjust, and is maintained
throughout the operating time with the use of a running-mode
calibration. The running-mode calibration provides immunity
to environmental effects such as micro-oscillations of the target
or sudden air gap changes.
The device is ideally suited to obtaining speed and duty cycle
information in gear tooth–based speed, position, and timing
applications, such as in speedometers.
Continued on the next page…
Not to scale
ATS468-DS
VCC
E1
Hall
Amplifier
E2
Automatic Offset
Adjustment (AOA)
Control
∑
AOA DAC
Gain
Internal
Regulator
Automatic Gain
Control (AGC)
AGC DAC
Test Signals
TEST
Tracking DAC
Peak Hold
+
–
Functional Block Diagram
Current
Limit
OUT
GND