A1160
Chopper-Stabilized Precision Hall-Effect Switch
With Advanced Diagnostics
Description
Features and Benefits
AEC-Q100 automotive qualified
The A1160 is a unipolar, Hall-effect switch with an externally
Unipolar switchpoints
enabled diagnostic function. In normal operating mode, the
Externally enabled diagnostics feature
A1160 functions as a standard, unipolar Hall-effect switch.
Diagnostics feature exercises the entire magnetic and
The output transistor turns on (output signal switches low)
electrical signal path within the IC
in the presence of a sufficient magnetic field (>B (max)).
OP
Resistant to physical stress
Additionally, the output transistor of the A1160 switches
Superior temperature stability through advanced chopper
off (output signal switches high) when the magnetic field is
stabilization techniques
removed (< B (min)).
RP
Output short-circuit protection
The A1160 includes conductive coils in close proximity to the
Internal regulator enables operation from unregulated
Hall element. When the diagnostic feature is enabled, these
supplies
coils are energized. The energized coils generate an internal
Reverse-battery protection
magnetic field that can be sensed by the Hall element. While
Solid-state reliability
in Diagnostic mode, the output of the A1160 provides a square
Small surface-mount package
wave output, which confirms the IC is properly sensing the
Package: 5-pin SOT23W (suffix LH)
internally generated magnetic field. The Diagnostic mode
exercises the entire magnetic and electrical signal path internal
to the IC, fully confirming functionality. Therefore, use of the
A1160 either eliminates the need for redundant sensors in safety
critical applications or increases robustness in safety critical
applications that require redundant sensors (drive-by-wire
systems and so forth).
The A1160 Hall-effect sensor IC is extremely temperature-
Approximate footprint
stable and stress-resistant, especially suited for operation
Continued on the next page
Functional Block Diagram
VCC V
REG
VOUT
To all subcircuits
Regulator
Hall
Element
Signal
Amplifier
Recovery
Control
Threshold
Normal
Current
Limit
Diagnostic
DIAG
System Diagnostics
GND
A1160-DS, Rev. 2 January 25, 2019
MCO-0000560
Dynamic Offset
CancellationChopper-Stabilized Precision Hall-Effect Switch
A1160
With Advanced Diagnostics
Description (continued)
at temperature ranges up to 150C. Superior high-temperature chopper stabilization, Schmitt trigger, and a open-drain output able
performance is made possible through advanced dynamic offset to sink up to 25 mA. An on-board regulator permits operation with
cancellation techniques, which reduce the residual offset voltage supply voltages of 3.8 to 24 V.
normally caused by device overmolding, temperature dependencies,
The A1160 is provided in a 5-pin SOT23W. The package is lead
and thermal stress. This device includes on a single silicon chip:
(Pb) free, with 100% matte-tin leadframe plating.
a voltage regulator, Hall-voltage generator, small-signal amplifier,
Selection Guide
Part Number Packing*
10,000 pieces
A1160LLHLX-T
per 13-in. reel
*Contact Allegro for additional packing options.
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Unit
Forward Supply Voltage V 30 V
CC
Reverse Supply Voltage V 18 V
RCC
Forward Diagnostic Enable Voltage V 5.5 V
DIAG
Reverse Diagnostic Enable Voltage V 0.5 V
RDIAG
Output-Off Voltage V 30 V
OUT
Continuous Output Current I 25 mA
OUT
Reverse Output Current I 50 mA
ROUT
Operating Ambient Temperature T L temperature range 40 to 150 C
A
Maximum Junction Temperature T (max) 165 C
J
Storage Temperature T 65 to 170 C
stg
Pin-Out Diagram
Terminal List Table
5
Name Number Function
DIAG 1, 3 Diagnostics enable (use either pin 1 or pin 3)
VCC 2 Connects power supply to chip
GND 4 Ground
VOUT 5 Output from circuit
1
2
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com