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A1184 Datasheet Preview

A1184 Datasheet

Unipolar Hall-Effect Switches

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A1184
Standard Two-Wire Field-Programmable Chopper-Stabilized
Unipolar Hall-Effect Switches
Features and Benefits
Chopper stabilization
Low switchpoint drift over operating
temperature range
Low sensitivity to stress
Field programmable for optimized switchpoints
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 to 24 V operation
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
TheA1184 device is a standard, two-wire, unipolar, Hall effect
switch. The operate point, BOP, can be field-programmed,
after final packaging of the device and placement into the
application. This advanced feature allows the optimization of
the device switching performance, by effectively accounting
for variations caused by mounting tolerances for the device
and the target magnet.
This device is produced on theAllegro MicroSystems advanced
BiCMOS wafer fabrication process, which implements a
high-frequency, chopper-stabilization technique that
achieves magnetic stability and eliminates the offsets
that are inherent in single-element devices exposed to harsh
application environments. Commonly found in a number of
automotive applications, the A1184 is utilized in sensing: seat
track position, seat belt buckle presence, hood/trunk latching,
and shift selector position.
Two-wire unipolar switches are particularly advantageous
in price-sensitive applications, because they require one
less wire than the more traditional open-collector output
switches. Additionally, the system designer gains inherent
diagnostics because output current normally flows in either
Not to scale
V+
VCC
0.01 uF
Continued on the next page…
Functional Block Diagram
Program/Lock
Programming
Logic
Offset
Clock/Logic
Amp
Low-Pass
Filter
Regulator
GND
Package UA Only
GND
A1184-DS, Rev. 8




Allegro

A1184 Datasheet Preview

A1184 Datasheet

Unipolar Hall-Effect Switches

No Preview Available !

A1184
Standard Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switch
Description (continued)
of two narrowly-specified ranges. Any output current level outside
of these two ranges is a fault condition. The A1184 also features
on-chip transient protection, and a Zener clamp to protect against
overvoltage conditions on the supply line.
The output current of the A1184 switches HIGH in the presence of
a south polarity magnetic field of sufficient strength; and switches
LOW otherwise, including when there is no significant magnetic
field present.
Both devices are offered in two package styles: LH, a SOT-23W
miniature low-profile package for surface-mount applications, and
UA, a three-lead ultramini Single Inline Package (SIP) for through-
hole mounting. Each package is available in a lead (Pb) free version
(suffix, –T) with 100% matte tin plated leadframe.
Factory-programmed versions are also available. Refer to: A1140,
A1141, A1142, A1143, A1145, and A1146.
Selection Guide
Part Number
Packing1
Mounting
A1184ELHLT-T 7-in. reel, 3000 pieces/reel
A1184EUA-T
Bulk, 500 pieces/bag
A1184LLHLT-T 7-in. reel, 3000 pieces/reel
A1184LUA-T
Bulk, 500 pieces/bag
1Contact Allegro for additional packing options.
2South (+) magnetic fields must be of sufficient strength.
Surface mount
SIP through hole
Surface mount
SIP through hole
Ambient, TA
(°C)
–40 to 85
–40 to 150
Output
South (+) Field2
Supply Current at
Low Output, ICC(L)
(mA)
High
5 to 6.9
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
B
TA
TJ(max)
Tstg
Range E
Range L
Notes
Rating
28
–18
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
G
ºC
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A1184
Description Unipolar Hall-Effect Switches
Maker Allegro
Total Page 14 Pages
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