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A1183 Datasheet Preview

A1183 Datasheet

Unipolar Hall-Effect Switch

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A1180, A1181, A1182, and A1183
Sensitive 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
The A1180, A1181, A1182, and A1183 devices are sensitive,
two-wire, unipolar, Hall effect switches.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 family of devices are produced on the Allegro
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 A1180-83 family of devices are 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
Not to scale
V+
VCC
0.01 uF
A1180-DS, Rev. 14
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




Allegro MicroSystems

A1183 Datasheet Preview

A1183 Datasheet

Unipolar Hall-Effect Switch

No Preview Available !

A1180, A1181,
A1182, and A1183
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
Description (continued)
wire than the more traditional open-collector output switches.
Additionally, the system designer gains inherent diagnostics
because output current normally ows in either of two narrowly-
specied ranges. Any output current level outside of these two
ranges is a fault condition. The A1180-83 family of devices also
features on-chip transient protection, and a Zener clamp to protect
against overvoltage conditions on the supply line.
The output currents of the A1181 and A1183 switch HIGH in the
presence of a south polarity magnetic eld of sufcient strength;
and switch LOW otherwise, including when there is no signicant
magnetic eld present. The A1180 and A1182 have inverted out-
put current levels: switching LOW in the presence of a south polar-
ity magnetic eld of sufcient strength, and HIGH otherwise. The
devices also differ in their specied LOW current supply levels.
Both devices are offered in two package styles: LH, a SOT-23W
miniature low-prole 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 (sufx, –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
A1180ELHLT-T3
A1180LUA-T4
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Mounting
Surface mount
SIP through hole
Ambient, TA
(°C)
–40 to 85
Output
South (+) Field2
Low
Supply Current at Low
Output, ICC(L) (mA)
2 to 5
A1182ELHLT-T4
A1182EUA-T4
A1182LLHLT-T4
A1182LUA-T4
A1183ELHLT-T4
A1183EUA-T4
A1183LLHLT-T4
A1183LUA-T4
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Surface mount
SIP through hole
Surface mount
SIP through hole
Surface mount
SIP through hole
Surface mount
SIP through hole
–40 to 85
–40 to 150
–40 to 85
–40 to 150
Low
High
5 to 6.9
1Contact Allegro for additional packing options.
2South (+) magnetic fields must be of sufficient strength.
3This variant is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device
will enter its final, Last Time Buy, order phase. Status change: January 31, 2011. Suggested replacement: A1190LLHLX-T.
4Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to
existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples
are no longer available. Status change: January 31, 2011.
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 A1183
Description Unipolar Hall-Effect Switch
Maker Allegro MicroSystems
Total Page 15 Pages
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