A1160 Datasheet, PDF (1/13 Pages) Allegro MicroSystems – Chopper-Stabilized Precision Hall Effect Switch With Advanced Diagnostics

A1160
Chopper-Stabilized Precision Hall Effect Switch
With Advanced Diagnostics
Features and Benefits
• Unipolar switchpoints
• Externally enabled diagnostics feature
• Diagnostics feature exercises the entire magnetic and
electrical signal path within the IC
• Resistant to physical stress
• Superior temperature stability through advanced chopper
stabilization techniques
• Output short-circuit protection
• Internal regulator enables operation from unregulated
supplies
• Reverse battery protection
• Solid-state reliability
• Small, surface mount package
Package: 5-pin SOT23W (suffix LH)
Approximate footprint
Description
The A1160 is a unipolar, Hall effect switch with an externally
enabled diagnostic function. In normal operating mode, the
A1160 functions as a standard, unipolar Hall effect switch.
The output transistor turns on (output signal switches low)
in the presence of a sufficient magnetic field (>B_OP(max)).
Additionally, the output transistor of the A1160 switches
off (output signal switches high) when the magnetic field is
removed (< B_RP(min)).
The A1160 includes conductive coils in close proximity to the
Hall element. When the diagnostic feature is enabled, these
coils are energized. The energized coils generate an internal
magnetic field that can be sensed by the Hall element. While
in Diagnostic mode, the output of the A1160 provides a square
wave output, which confirms the IC is properly sensing the
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-
stable and stress-resistant, especially suited for operation
Continued on the next page…
VCC
DIAG
Functional Block Diagram
Regulator
V_REG
Hall
Element
To all subcircuits
Amplifier
Signal
Recovery
Threshold
Normal
Diagnostic
System Diagnostics
Control
Current
Limit
VOUT
GND
A1160-DS