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Allegro MicroSystems - Hall Effect Latch for High Temperature Operation

Numéro de référence A1225
Description Hall Effect Latch for High Temperature Operation
Fabricant Allegro MicroSystems 
Logo Allegro MicroSystems 





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A1225 fiche technique
A1225, A1227, and A1229
Hall Effect Latch for High Temperature Operation
Features and Benefits
Symmetrical switchpoints
Superior temperature stability
Operation from unregulated supply
Open-drain 25 mA output
Reverse Battery protection
Activate with small, commercially available
permanent magnets
Solid-state reliability
Small size
Resistant to physical stress
Enhanced ESD structures result in 8 kV HBM ESD
performance without external protection components
Internal protection circuits enable 40 V load dump
compliance without external protection components
Packages:
3-pin SIP
(suffix UA)
Not to scale
3-pin SOT89
(suffix LT)
Description
These Hall-effect latches are extremely temperature-stable
and stress resistant sensor ICs especially suited for operation
over extended temperature ranges to 150°C. Superior high-
temperature performance is made possible through a novel
Schmitt trigger circuit that maintains operate and release
point symmetry by compensating for temperature changes
in the Hall element. Additionally, internal compensation
provides magnetic switchpoints that become more sensitive
with temperature, hence offsetting the usual degradation of
the magnetic field with temperature. The symmetry capability
makes these devices ideal for use in pulse-counting applications
where duty cycle is an important parameter. The three basic
devices (A1225, A1227, and A1229) are identical except for
magnetic switchpoints.
Each device includes on a single silicon chip a voltage regulator,
Hall-voltage generator, temperature compensation circuit,
signal amplifier, Schmitt trigger, and a buffered open-drain
output to sink up to 25 mA. The on-board regulator permits
operation with supply voltages of 3.8 to 24 V.
The first character of the part number suffix determines the
device operating temperature range. Suffix L is for –40°C to
150°C. Two package styles provide a magnetically optimized
package for most applications. Suffix LT is a miniature SOT89/
TO-243AAtransistor package for surface-mount applications,
suffix UAis a three-lead ultra-mini-SIP. Both packages are lead
(Pb) free with 100% matte tin leadframe plating.
Functional Block Diagram
VCC
Regulator
Clock / Logic
To All Subcircuits
VOUT
A1225-DS, Rev. 1
AMP
Anti-aliasing
LP-Filter
Tuned Filter
GND

PagesPages 13
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