ATS675 Datasheet, PDF (1/14 Pages) Allegro MicroSystems – Self-Calibrating TPOS Speed Sensor IC Optimized for Automotive Cam Sensing Applications

ATS675LSE
Self-Calibrating TPOS Speed Sensor IC
Optimized for Automotive Cam Sensing Applications
Features and Benefits
▪ Optimized for automotive camshaft sensing
▪ True target state recognition at device power-on (TPOS)
and at zero target speed
▪ Chopper stabilization reduces offset drift
▪ Digital output polarity option: follow or invert target profile
▪ Rapid calibration and transition to Running mode
▪ Automatic Gain Control (AGC) during calibration
eliminates effects of air gap variations
▪ Tight timing accuracy over full operating
temperature range
▪ Operation at supply voltages as low as 3.3 V
▪ Undervoltage lockout (UVLO)
Package: 4-pin SIP (suffix SE)
Not to scale
Description
The ATS675 is a next generation member of the Allegro^® True
Power-On State (TPOS) sensor IC family, offering improved
accuracy compared to prior generations, and performing at
absolutely zero target speed. An output polarity option allows
customization for specific applications.
The device incorporates a single Hall-element IC with an
optimized custom magnetic circuit that switches in response to
magnetic signals. The resulting output of the device is a digital
representation of a ferromagnetic target profile.
The IC contains a sophisticated digital circuit designed to
eliminate the detrimental effects of magnetic and system offsets.
Signal processing is used to provide target state recognition
at zero rotational speed, consistent switchpoints regardless
of air gap, and dynamically adapt device performance to the
typical operating conditions found in automotive environments,
particularly cam sensing applications.
High-resolution peak-detecting DACs are used to set the
adaptive switching thresholds of the device. The ATS675 also
includes a filter that increases the noise immunity and the
signal-to-noise ratio of the IC.
The device is provided in a 4-pin SIP package (SE) that is lead
(Pb) free with 100% matte tin leadframe plating.
Typical Application
V_S
C_BYPASS
0.1 μF
1
VCC
ATS675
3
2
TEST
OUT
A
GND
4
A Recommended
V_PU
R_PU
Output
C_L
ATS675LSE-DS, Rev. 2
Figure 1. Operational circuit for the ATS675