A1185LLHLT-T Allegro Microsystems Inc, A1185LLHLT-T Datasheet - Page 2

• Manufacturer Part Number: A1185LLHLT-T
• Description: IC SWITCH HALL EFFECT UNI SOT-23
• Manufacturer: Allegro Microsystems Inc
• Type: Unipolar Switchr

Specifications of A1185LLHLT-T

• Sensing Range: 10G ~ 60G Trip - Programmable, Fixed Release
• Voltage - Supply: 3.5 V ~ 24 V
• Current - Supply: 6.9mA
• Output Type: Digital, Open Collector
• Features: Programmable
• Operating Temperature: -40°C ~ 150°C
• Package / Case: SOT-23W
• 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): 60Gs
• Mag Sensor Hysteresis(g): 15Gs
• Package Type: SOT-23W
• Pin Count: 3
• Mounting: Surface Mount
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output (max): -
• Lead Free Status / RoHS Status: Compliant, Lead free / RoHS 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
A1185-DS, Rev. 10
▫ 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
Chopper-Stabilized Unipolar Hall-Effect Switches
Ultrasensitive Two-Wire Field-Programmable
Functional Block Diagram
Clock/Logic
Amp
Program/Lock
Programming
Logic
Low-Pass
Filter
Description
The A1185 and A1186 are ultrasensitive, two-wire, unipolar
Hall effect switches. The operate point, B
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 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 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
Continued on the next page…
Offset
Adjust
Regulator
Package UA Only
To all
subcircuits
GND
A1185 and A1186
GND
OP
, can be field-