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A1185 Datasheet Preview

A1185 Datasheet

Unipolar Hall-Effect Switches

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A1185 and A1186
Ultrasensitive 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 A1185 and A1186 are ultrasensitive, 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 new DABIC5 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 A1185 and
A1186 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 wire
Not to scale
V+
VCC
0.01 uF
Continued on the next page…
Functional Block Diagram
Program/Lock
Programming
Logic
Offset
Adjust
Clock/Logic
Amp
Low-Pass
Filter
Regulator
To all
subcircuits
A1185-DS, Rev. 10
GND
Package UA Only
GND




Allegro MicroSystems

A1185 Datasheet Preview

A1185 Datasheet

Unipolar Hall-Effect Switches

No Preview Available !

A1185 and
A1186
Ultrasensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
Description (continued)
than the more traditional open-collector output switches.Additionally,
the system designer gains inherent diagnostics because output current
normally flows in either of two narrowly-specified ranges. This
provides distinct current ranges for IOUT(H) and IOUT(L). Any output
current level outside of these two ranges is a fault condition.
Other features of the A1185 and A1186 devices include on-chip
transient protection and a Zener clamp on the power supply to protect
against overvoltage conditions on the supply line.
The output current of the A1186 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. The A1185 has an inverted output current level: switching
LOW in the presence of a south polarity magnetic field of sufficient
strength, and HIGH otherwise.
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: A1145
and A1146.
Selection Guide
Part Number
Packing1
A1185ELHLT-T
7-in. reel, 3000 pieces/reel
A1185EUA-T
Bulk, 500 pieces/bag
A1185LUA-T
Bulk, 500 pieces/bag
A1186ELHLT-T
7-in. reel, 3000 pieces/reel
A1186LLHLT-T
7-in. reel, 3000 pieces/reel
A1186LUA-T
Bulk, 500 pieces/bag
1Contact Allegro for additional packing options.
2South (+) magnetic fields must be of sufficient strength.
Mounting
Surface mount
SIP through hole
SIP through hole
Surface mount
Surface mount
SIP through hole
Ambient, TA
(°C)
–40 to 85
–40 to 150
–40 to 85
–40 to 150
Output
South (+) Field2
Supply Current at Low
Output, ICC(L)
(mA)
Low
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 A1185
Description Unipolar Hall-Effect Switches
Maker Allegro MicroSystems
Total Page 14 Pages
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