A1184LUA Allegro Microsystems Inc, A1184LUA Datasheet - Page 2

• Manufacturer Part Number: A1184LUA
• Description: IC SWITCH HALL EFFECT UNI 3-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Unipolar Switchr

Specifications of A1184LUA

• Sensing Range: 300G ~ 600G - Programmable, Fixed Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 6.9mA
• Output Type: Digital, Differential
• Features: Programmable
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 3-SIP
• Magnetic Type: Unipolar
• Operating Supply Voltage (min): 3.5V
• Operating Supply Voltage (typ): 5/9/12/15/18V
• Operating Supply Voltage (max): 24V
• Mag Sensor Operate Point (g): 600Gs
• Mag Sensor Hysteresis(g): 15Gs
• Package Type: Ultra Mini SIP
• Pin Count: 3
• Mounting: Through Hole
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output (max): -
• Lead Free Status / RoHS Status: Not Compliant, Contains lead / RoHS non-compliant

Features and Benefits
▪ Chopper stabilization
▪ Field programmable for optimized switchpoints
▪ On-chip protection
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Not to scale
A1184-DS, Rev. 8
Standard Two-Wire Field-Programmable Chopper-Stabilized
▫ Low switchpoint drift over operating
▫ Low sensitivity to stress
▫ Reverse-battery protection
▫ On-board voltage regulator
▫ 3.5 to 24 V operation
▫ Supply transient protection
temperature range
V+
0.01 uF
VCC
Clock/Logic
Functional Block Diagram
Amp
Program/Lock
Programming
Logic
Low-Pass
Filter
Offset
Unipolar Hall-Effect Switches
Description
The A1184 device is a standard, two-wire, unipolar, Hall effect
switch. The operate point, B
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 the Allegro MicroSystems advanced
BiCMOS wafer fabrication process, which implements a
patented, 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
Continued on the next page…
Package UA Only
Regulator
GND
GND
OP
, can be field-programmed,
A1184