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A3197LLT Schematic ( PDF Datasheet ) - Allegro MicroSystems

Teilenummer A3197LLT
Beschreibung PROTECTED/ HIGH-TEMPERATURE/ OPEN-COLLECTOR HALL-EFFECT LATCH
Hersteller Allegro MicroSystems
Logo Allegro MicroSystems Logo 




Gesamt 12 Seiten
A3197LLT Datasheet, Funktion
3197
PROTECTED, HIGH-TEMPERATURE,
OPEN-COLLECTOR HALL-EFFECT LATCH
PTCT
V
CC
12
3
Dwg. PH-003-2
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC
(100 ms) ................................... 115 V*
(continuous) ............................... 28 V*
Reverse Battery Voltage, VRCC
(100 ms) ................................... -100 V
(continuous) ............................... -35 V
Magnetic Flux Density, B .......... Unlimited
Output OFF Voltage, VOUT ................. 26 V
Reverse Output Voltage VOUT ......... -0.5 V
Continuous Output Current,
IOUT .......................................... 35 mA*
Reverse Output Current,
IOUT ........................................ -100 mA
Package Power Dissipation,
PD ....................................... See Graph
Junction Temperature, TJ ................. 170°C
Operating Temperature Range,
TA .......................................... -40°C to +150°C
Storage Temperature, TS .................. 170°C
*Fault condition, internal overvoltage shutdown
above 28 V; output current limited above 35 mA.
These open-collector Hall-effect latches are capable of sensing magnetic
fields while using an unprotected power supply. The A3197LLT and A3197LU
can provide position and speed information by providing a digital output for
magnetic fields that exceed their predefined switch points. These devices
operate down to zero speed and have switch points that are designed to be
extremely stable over a wide operating temperature and voltage range. The
latching characteristics make them ideal for use in pulse counting applications
when used with a multi-pole ring magnet. Thermal and output short-circuit
protection allow an increased wiring harness fault tolerance. The temperature
compensated switch points, the wide operating voltage range, and the integrated
protection make these devices ideal for use in automotive applications such as
transmission speed sensors and integrated wheel bearing speed sensors.
Each monolithic device contains an integrated Hall-effect transducer, a
temperature-compensated comparator, a voltage regulator, and a buffered 35 mA
output sink stage. Supply protection is made possible by the integration of
overvoltage and undervoltage shutdown circuitry that monitor supply fault
conditions and shut down the IC. Noise shutdown circuitry (patent applied for)
prevents the propagation of supply transients to the logic load. Output protec-
tion circuitry includes a current limit loop that limits the maximum output sink
current, and thermal protection circuitry that shuts down the device during an
over-heating condition such as with a shorted load.
The A3197LLT and A3197LU are rated for operation over an extended
temperature range of -40°C to +150°C. They are supplied in a three-lead SIP
(suffix ‘U’) or a surface-mount SOT-89 (suffix ‘LT’).
FEATURES
I Internal Protection For Automotive (ISO/DIN) Transients
I Operation From Unregulated Supply
I Reverse Battery Protection
I Undervoltage Lockout
I Supply Noise-Suppression Circuitry
I Output Short-Circuit Protection
I Output Zener Clamp
I Thermal Protection
I Symmetrical Latching Switch Points
I Operable with Multipole Ring Magnets
Always order by complete part number, e.g., A3197LU .






A3197LLT Datasheet, Funktion
3197
PROTECTED, HIGH-TEMP.,
OPEN-COLLECTOR
HALL-EFFECT LATCH
Power Up Reset. These devices are de-
signed to power up with the output OFF
without regard to any magnetic field applied.
The output will remain OFF until the flux is
reduced to below BRP (S-N transition) and then
BOP is exceeded, depending on the turn-on
state of the internal latches.
Power Supply Transients (Noise);
Overvoltage and Undervoltage Lockout.
Even in protected devices, positive and
negative power supply transients that would
not normally cause physical damage can cause
logic errors in control systems. The A3197LT
and A3197LU include noise suppression
features to prevent this.
In a typical application, where the output
is externally pulled up to a regulated voltage
<28 V, the effects of power supply transients
on the device output are suppressed by turning
the output driver OFF during the first
undervoltage, VCC(UV), (or negative) condition,
or first overvoltage (positive) condition,
VCC(OV), and maintaining a power up reset
mode until normal power is restored. Note
that after the initial transient, the output does
not change logic state during subsequent
power supply noise pulses.
An external 0.1 µF to 0.5 µF capacitor,
with good high-frequency characteristics,
should be connected between terminals 1 and 2
to bypass high-voltage noise and reduce EMI
susceptibility.
+B
0
-B
VCC
BOP
BRP
0
FIRST BOP AFTER
POWER UP
VOUT
VOUT(SAT)
Dwg. WH-006
BOP
0
BRP
VCC
0
VOUT
FIRST BOP AFTER
TRANSIENT(S)
CLASSICAL OUTPUT RESPONSE
VOUT
A3197OUTPUT RESPONSE
Dwg. WH-007-2A
BOP
0
BRP
VCC
0
VOUT
VOUT
FIRST BOP AFTER
TRANSIENT(S)
CLASSICAL OUTPUT RESPONSE
A3197OUTPUT RESPONSE
Dwg. WH-007-1A
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

6 Page









A3197LLT pdf, datenblatt
3197
PROTECTED, HIGH-TEMP.,
OPEN-COLLECTOR
HALL-EFFECT LATCH
The products described herein are manufactured under one or more
of the following U.S. patents: 5,045,920; 5,264,783; 5,442,283;
5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719;
5,686,894; 5,694,038; 5,729,130; 5,917,320; and other patents
pending.
Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support appliances, devices, or systems without express written
approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibil-
ity for its use; nor for any infringements of patents or other rights of
third parties that may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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