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PDF A3197EU Data sheet ( Hoja de datos )
| Número de pieza | A3197EU | |
| Descripción | PROTECTED/ HIGH-TEMPERATURE/ OPEN-COLLECTOR HALL-EFFECT LATCH | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de A3197EU (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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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 .
1 page  
OPERATION
In operation, the output transistor is OFF
until the strength of the magnetic field
perpendicular to the surface of the chip
exceeds the threshold or operate point (BOP).
When the field strength exceeds BOP, the
output transistor switches ON
(a logic low) and is capable of sinking
35 mA of current.
The output transistor switches OFF (a
logic high) when magnetic field reversal
results in a magnetic flux density below the
OFF threshold (BRP). This is illustrated in
the transfer characteristics graph. Note that
the device latches; that is, a south pole of
sufficient strength will turn the device ON.
Removal of the south pole will leave the
device ON. The presence of a north pole of
sufficient strength is required to turn the
device OFF.
The switch points increase in sensitivity
with increasing temperature to compensate
for the typical ferrite magnet temperature
characteristic. The simplest form of magnet
that will operate these devices is a ring
magnet. Other methods of operation are
possible.
3197
PROTECTED, HIGH-TEMP.,
OPEN-COLLECTOR
HALL-EFFECT LATCH
TEST CIRCUIT AND TYPICAL APPLICATION
VCC(UV) TO 26 V
WITH TRANSIENTS
VCC
REGULATED
< 26 V
VBB
1
RL
3 TO µP
CBYPASS
X
CL
2
Dwg. EH-006A
26 V
MAX
VBB
B RP
B OP
0
-B
0
FLUX DENSITY
VOUT(SAT)
+B
Dwg. GH-034-2A
www.allegromicro.com
5 Page 
3197
PROTECTED, HIGH-TEMP.,
OPEN-COLLECTOR
HALL-EFFECT LATCH
A3197EU and A3197LU
Dimensions in Inches
(controlling dimensions)
Dimensions in Millimeters
(for reference only)
0.183
0.178
0.063
0.059
4.65
4.52
1.60
1.50
0.181
0.176
0.086 1 2 3
MAX
0.600
0.560
SEE NOTE
0.0189
0.0142
45°
0.018
0.0173
0.0138
0.050
0.100
Dwg. MH-003E in
4.60
4.47
2.18 1 2 3
MAX
15.24
14.23
SEE NOTE
0.48
0.36
1.27
2.54
45°
0.46
0.44
0.35
Dwg. MH-003E mm
NOTES: 1. Tolerances on package height and width represent allowable mold offsets.
Dimensions given are measured at the widest point (parting line).
2. Exact body and lead configuration at vendor’s option within limits shown.
3. Height does not include mold gate flash.
4. Recommended minimum PWB hole diameter to clear transition area is 0.035" (0.89 mm).
5. Where no tolerance is specified, dimension is nominal.
www.allegromicro.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A3197EU.PDF ] | |
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