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PDF A1162 Data sheet ( Hoja de datos )
| Número de pieza | A1162 | |
| Descripción | Programmable Precision Hall-Effect Switch | |
| Fabricantes | Allegro | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A1162 (archivo pdf) en la parte inferior de esta página. Total 23 Páginas | ||
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A1162
Programmable Precision Hall-Effect
Switch with Advanced Diagnostics
FEATURES AND BENEFITS
• User-programmable unipolar switchpoints
• Integrated diagnostics for enhanced system safety and
reliability
□□Enabled on demand
□□Integrated electromagnetic coils test the entire sensor
signal path
□□Designed for ISO 26262 / ASIL systems (QM)
• Chopper stabilized
□□Resistant to physical stress
□□Superior temperature stability
• Internal regulator for wide operating voltage range
□□3.8 to 24 V
• Automotive-grade ruggedness
□□Solid-state reliability
□□Reverse-battery protection
□□Output short-circuit protection
□□AEC-Q100 qualified
2
-
• Small surface-mount package
PACKAGE:
8-Pin eTSSOP (Suffix LE)
Not to scale
DESCRIPTION
The A1162 is a unipolar Hall-effect switch with an externally
enabled diagnostic function and user-programmable
switchpoints. On-chip electromagnetic coils are used to
implement self-test of the sensor’s entire magnetic and electrical
signal chain. It is designed for systems where precise magnet
switchpoints and safety, reliability, or both, are critical, such
as those designed to meet the requirements of ISO 26262.
In normal operating mode, the A1162 functions as a standard
unipolar Hall-effect switch. The device output transistor turns
on (output signal switches low) in the presence of sufficient
magnetic field (>BOP max). The output transistor of the A1162
switches off (output signal switches high) when the magnetic
field is removed (<BRP min).
When the diagnostic feature is enabled, the output of theA1162
provides a square wave output which confirms the device
is properly sensing the internally generated magnetic field.
Therefore, use of the A1162 either eliminates the need for
redundant sensors in safety-critical applications or increases
robustness in safety-critical applications that might otherwise
require redundant sensors (drive-by-wire systems, etc.).
This monolithic IC integrates a voltage regulator, Hall voltage
generator, small-signal amplifier, chopper stabilization, Schmitt
trigger, and short-circuit-protected open-collector output able
to sink up to 25 mA. The on-board regulator permits operation
Continued on next page...
VCC
DIAG
A1162-DS
VREG
Regulator
To all subcircuits
AMP
Trim Control
Switchpoint
Programming
Signal
Recovery
Control
VREG
Threshold
NORM
DAIG
Current
Limit
System Diagnostics
VOUT
Functional Block Diagram
GND
1 page  
A1162
Programmable Precision Hall-Effect
Switch with Advanced Diagnostics
THERMAL CHARACTERISTICS: May require derating at maximum conditions; see application information
Characteristic
Symbol
Test Conditions*
Value
Package Thermal Resistance
RθJA
On 4-layer PCB based on JEDEC standard JESD51-7
145
*Additional thermal information available on the Allegro website
Unit
ºC/W
MaximumPoPwoewr DerisDsiipsastiipoantivoenrsvuss. AAmmbbiieennttTTeemmppeerraatuturere
1000
900
800
700
600
500
400
(RqJA = 145 ºC/W)
300
200
100
0
20 40 60 80 100 120 140 160 180
Temperature, TA (°C)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1162
Programmable Precision Hall-Effect
Switch with Advanced Diagnostics
Diagnostic Mode of Operation
The diagnostic mode is accessed by applying a voltage higher
than VIH on the diagnostic enable pin. The diagnostic mode uses
an internally generated magnetic signal to exercise the signal
path. This signal is compared to two reference signals in the
Schmitt Trigger block (refer to Figure 3).
If the diagnostic signal is between the two reference signals, the
part is considered to be working within specifications and a 50%
PWM signal is set at the output pin, as shown in Figure 3. If the
diagnostic signal is above the upper reference or below the lower
reference, the output is set at a fixed value (High/Low).
The diagnostic mode of operation not only detects catastrophic
failures but also drifts in the magnetic switchpoints. If BOP or
BRP drift to values below or above the values stated in the Drift
Detection Threshold table, the output is set at a fixed value when
in the diagnostic mode of operation.
DIAG
DIAG
VOUT
Device OK
Duty Cycle = 50%
Device Failure
Duty Cycle ≠ 50%
Figure 3: Diagnostic Functional Diagram
When the device passes, there will be a 50% duty-cycle signal sent out. In the event of a failure, the output will typically be forced either high
or low. Diagnostic mode is only active when DIAG is pulled high.
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet A1162.PDF ] | |
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