ATS128LSE Datasheet, PDF (1/25 Pages) Allegro MicroSystems – Chopper stabilization for stable switchpoints throughout operating temperature range

ATS128LSE
Highly Programmable, Back-Biased, Hall-Effect Switch
with TPOS Functionality
Features and Benefits
• Chopper stabilization for stable switchpoints throughout
operating temperature range
• User-programmable:
▫ Magnetic operate point through the VCC pin:
9 programming bits provide 4-gauss resolution
▫ Output polarity
▫ Output fall time for reduced EMI in
automotive applications
• On-board voltage regulator for 3 to 24 V operation
• On-chip protection against:
▫ Supply transients
▫ Output short-circuits
▫ Reverse battery condition
• True Zero-Speed Operation
• True Power-On State
Package: 4-pin SIP (suffix SE)
Not to scale
Description
The ATS128LSE programmable, true power-on state (TPOS),
sensor IC is an optimized combination of Hall-effect IC and
rare-earth pellet that switches in response to magnetic signals
created by ferromagnetic targets in gear-tooth sensing and
proximity sensing applications.
These devices offer a wide programming range for the magnetic
operate point, B_OP . A fixed hysteresis then sets the magnetic
release point, B_RP , based on the selected B_OP .
The devices are externally programmable. A wide range of
programmability is available on the magnetic operate point,
B_OP , while the hysteresis remains fixed. This advanced
feature allows optimization of the sensor IC switchpoint and
can drastically reduce the effects of mechanical placement
tolerances found in production environments.
A proprietary dynamic offset cancellation technique, with
an internal high-frequency clock, reduces the residual offset
voltage, which is normally caused by device overmolding,
temperature dependencies, and thermal stress. Having the Hall
element and amplifier in a single chip minimizes many problems
normally associated with low-level analog signals.
This device is ideal for use in gathering speed or position
information using gear-tooth–based configurations, or for
proximity sensing with ferromagnetic targets.
The ATS128 is provided in a 4-pin SIP. It is lead (Pb) free,
with 100% matte tin leadframe plating.
ATS128LSE-DS
Functional Block Diagram
VCC
Regulator
To all subcircuits
Trim Control
TC Trim
Switchpoint
GND
Amp Signal Recovery
Program Control
Output Fall Time
Output Polarity
VOUT