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What is 3046?

This electronic component, produced by the manufacturer "Allegro MicroSystems", performs the same function as "HALL EFFECT GEAR-TOOTH SENSORS ZERO SPEED".


3046 Datasheet PDF - Allegro MicroSystems

Part Number 3046
Description HALL EFFECT GEAR-TOOTH SENSORS ZERO SPEED
Manufacturers Allegro MicroSystems 
Logo Allegro MicroSystems Logo 


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3046, 3056, AND
3058
HALL EFFECT GEAR-TOOTH SENSORS
–ZERO SPEED
XX
V
CC
12
3
Dwg. PH-012
Pinning is shown viewed from branded side.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC . . . . . . . . . . . . . . 28 V
Reverse Battery Voltage,
VRCC . . . . . . . . . . . . . . . . . . . . . . -30 V
Magnetic Flux Density, B . . . . . Unlimited
Output OFF Voltage, VOUT . . . . . . . . . 28 V
Reverse Output Voltage, VOUT . . . . . -0.5 V
Output Current, IOUT . . . . . . . . . . . . 25 mA
Package Power Dissipation, PD . . 500 mW
Operating Temperature Range, TA
Suffix “EU” . . . . . . . . . -40°C to +85°C
Suffix “LU” . . . . . . . . -40°C to +150°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -65°C to +170°C
The A3046EU/LU, A3056EU/LU, and A3058EU/LU Hall effect
gear-tooth sensors are monolithic integrated circuits that switch in
response to differential magnetic fields created by ferrous targets.
These devices are ideal for use in gear-tooth-based speed, position,
and timing applications and operate down to zero rpm over a wide
range of air gaps and temperatures. When combined with a back-
biasing magnet and proper assembly techniques, devices can be
configured to give 50% duty cycle or to switch on either leading,
trailing, or both edges of a passing gear tooth or slot.
The six devices differ only in their magnetic switching values and
operating temperature ranges. The low hysteresis of the A3046/56EU
and A3046/56LU makes them perfectly suited for ABS (anti-lock brake
system) or speed sensing applications where maintaining large air
gaps is important. The A3046EU/LU features improved switch point
stability with temperature over the A3056EU/LU. The high hysteresis
of the A3058EU and A3058LU, with their excellent temperature
stability, makes them especially suited to ignition timing applications
where switch-point accuracy (and latching requirements) is extremely
important.
Continued next page...
BENEFITS
I Senses Ferrous Targets Down to Zero RPM
I Large Effective Air Gap
I Wide Operating Temperature Range
I Operation from Unregulated Supply
I High-Speed Operation
I Output Compatible With All Logic Families
I Reverse Battery Protection
I Solid-State Reliability
I Resistant to Physical Stress
SELECTION GUIDE
Operating Temp. Range
-40°C to +85°C
-40°C to +150°C
Switching Hysteresis
15-90 G
150-250 G
Device Type Number
A3046EU
A3056EU
A3058EU
A3046LU
A3056LU
A3058LU

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3046 equivalent
3046, 3056, AND 3058
HALL EFFECT
GEAR-TOOTH SENSORS
–ZERO SPEED
Sensor Operation. The A3046EU/LU,
A3056EU/LU, and A3058EU/LU sensor ICs
each contain two integrated Hall transducers
(E1 and E2) that are used to sense a mag-
netic field differential across the face of the
IC (see SENSOR LOCATION drawing). Referring
to Figure 2, the trigger switches the output
ON (output LOW) when BE1 BE2 > BOP and
switches the output OFF (output HIGH) when
BE1 BE2 < BRP. The difference between BOP
and BRP is the hysteresis of the device.
Figure 3 relates the output state of a
back-biased sensor IC, with switching
characteristics shown in Figure 2, to the
target gear profile and position. Assume a
north pole back-bias configuration (equivalent
to south pole at the face of the device). The
motion of the gear produces a phase-shifted
field at E1 and E2 (Figure 3 (a)); internal
conditioning circuitry subtracts the field at the
two elements (Figure 3 (b)); and the Schmitt
trigger at the output of the conditioning
circuitry switches at the pre-determined
thresholds (BOP and BRP). As shown (Figure
3 (c)), the IC output is LOW whenever sensor
E1 sees a (ferrous) gear tooth and sensor E2
faces air. The output is HIGH when sensor
E1 sees air and sensor E2 sees the ferrous
target.
A gear-tooth sensor can be configured
(see ASSEMBLY TECHNIQUES) to operate as a
latch, a (positive) switch, or a negative
switch. Note the change in duty cycle in
each of the cases (Figure 4).
A latch is a device where the operate
point is greater than zero gauss and the
release point is less than zero gauss. With
the configuration shown in Figure 3, such a
device will switch ON on the leading edge
and OFF on the trailing edge of the target
tooth.
A (positive) switch is a device where
both the operate and release points are
greater than zero gauss (positive values).
Figure 3
GEAR-TOOTH SENSOR OPERATION
LEADING
EDGE
TRAILING
EDGE
GEAR
DIRECTION
OF ROTATION
E2 E1
NORTH
SOUTH
4300 G
B &B
E1 E2
(a)
4130 G
150 G
BOP= +25 G
B B
E1 E2
0G
BRP= 25 G
-150 G
V
OUT
V
OUT(SAT)
(b)
OUTPUT DUTY CYCLE 50%
(c)
Dwg. WH-003
In the configuration shown in Figure 3, such a device will switch ON
and then switch OFF on the leading or rising edge of the target tooth
(Figure 4 (a)).
A negative switch is a device where both the operate and release
points are less than zero gauss (negative values). In the configuration
shown in Figure 3, such a device will switch OFF and then switch ON
on the trailing or falling edge of the target tooth (Figure 4 (b)).
Speed sensors can use any of the three sensor configurations
described. Timing sensors, however, must use a latch to guarantee
dual-edge detection. Latches are most easily made using the
A3058EU or A3058LU device types.
www.allegromicro.com


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