ATS675LSE
Self-Calibrating TPOS Speed Sensor
Optimized for Automotive Cam Sensing Applications
Features and Benefits
Description
▪ Chopper stabilized; optimized for automotive cam
sensing applications
The ATS675 is the next generation of the Allegro® True
Power-On State (TPOS) sensor family, offering improved
accuracy compared to prior generations, gradual TPOS to
Running Mode adjustment for accuracy-shift reduction,
and longer output fall time for improved radiated emissions
performance. The ATS675 provides absolute zero-speed
performance and TPOS information.
▪ Optimized absolute timing accuracy step size through
gradual transition from TPOS to Running Mode
▪ High immunity to signal anomalies resulting from
magnetic overshoot and peak-to-peak field variation
▪ Tight timing accuracy over full operating
temperature range
The sensor incorporates a single-element Hall IC with an
optimized custom magnetic circuit that switches in response
to magnetic signals created by a ferromagnetic target. The IC
contains a sophisticated digital circuit designed to eliminate
the detrimental effects of magnet and system offsets. Signal
processingisusedtoprovidedeviceperformanceatzerotarget
speed, independent of air gap, and which adapts dynamically
to the typical operating conditions found in automotive
applications, particularly camshaft-sensing applications.
▪ True zero-speed operation
▪ Automatic Gain Control circuitry for air gap
independent switchpoints
▪ Operation at supply voltages down to 3.3 V
▪ Digital output representing target profile
▪ Undervoltage lockout (UVLO)
▪ Patented Hall IC-magnet system
▪ Increased output fall time for improved radiated
emissions performance
Highresolutionpeak-detectingDACsareusedtosettheadaptive
switching thresholds of the device, ensuring high accuracy
despite target eccentricity. Internal hysteresis in the thresholds
reducesthenegativeeffectsofanomaliesinthemagneticsignal
(such as magnetic overshoot) associated with targets used in
many automotive applications. The resulting output of the
device is a digital representation of the ferromagnetic target
profile. The ATS675 also includes a low bandwidth filter that
increases the noise immunity and the signal-to-noise ratio of
the sensor.
Package: 4-pin SIP module (suffix SE)
Not to scale
The device package is lead (Pb) free, with 100% matte tin
leadframe plating.
1
2
3
4
Typical Application
VS
CBYPASS
VPU
RPU
0.1 μF
1
VCC
ATS675
TEST
3
2
Sensor
Output
OUT
A
GND
4
CL
A
Recommended
Figure 1. Operational circuit for the ATS675
ATS675LSE-DS