which implements a patented, high-frequency, chopper-
stabilization technique that achieves magnetic stability and
eliminates the offsets that are inherent in single-element devices
exposed to harsh application environments. Commonly found
in a number of automotive applications, the A1180-83 family
of devices are utilized in sensing: seat track position, seat
belt buckle presence, hood/trunk latching, and shift selector
position.
Two-wire unipolar switches are particularly advantageous
in price-sensitive applications, because they require one less
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Continued on the next page…
Not to scale
Functional Block Diagram
V+
VCC
Program/Lock
Programming
Logic
Offset
Regulator
Clock/Logic
0.01 uF
Sample and Hold
Dynamic Offset
Cancellation
Low-Pass
Filter
Amp
GND
Package UA Only
GND
A1180-DS, Rev. 14
A1180, A1181,
A1182,
and
A1183
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
put current levels: switching
LOW
in the presence of a south polar-
ity magnetic
fi
eld of sufficient strength, and
HIGH
otherwise. The
devices also differ in their specified
LOW
current supply levels.
Both devices are offered in two package styles: LH, a SOT-23W
miniature low-profile package for surface-mount applications,
and UA, a three-lead ultramini Single Inline Package (SIP) for
through-hole mounting. Each package is available in a lead (Pb)
free version (suffix,
–T)
with 100% matte tin plated leadframe.
Factory-programmed versions are also available. Refer to: A1140,
A1141, A1142, A1143, A1145, and A1146.
Description (continued)
wire than the more traditional open-collector output switches.
Additionally, the system designer gains inherent diagnostics
because output current normally
fl
ows in either of two narrowly-
specified ranges. Any output current level outside of these two
ranges is a fault condition. The A1180-83 family of devices also
features on-chip transient protection, and a Zener clamp to protect
against overvoltage conditions on the supply line.
The output currents of the A1181 and A1183 switch
HIGH
in the
presence of a south polarity magnetic
fi
eld of sufficient strength;
and switch
LOW
otherwise, including when there is no significant
magnetic
fi
eld present. The A1180 and A1182 have inverted out-
Selection Guide
Part Number
A1180ELHLT-T
3
A1180LUA-T
4
A1182ELHLT-T
4
A1182EUA-T
4
A1182LLHLT-T
4
A1182LUA-T
4
A1183ELHLT-T
4
A1183EUA-T
4
A1183LLHLT-T
4
A1183LUA-T
4
1
Contact Allegro
2
South
Packing
1
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
7-in. reel, 3000 pieces/reel
Bulk, 500 pieces/bag
Mounting
Surface mount
SIP through hole
Surface mount
SIP through hole
Surface mount
SIP through hole
Surface mount
SIP through hole
Surface mount
SIP through hole
Ambient, T
A
(°C)
–40 to 85
–40 to 85
Output
South (+) Field
2
Low
Supply Current at Low
Output, I
CC(L)
(mA)
2 to 5
Low
–40 to 150
5 to 6.9
–40 to 85
High
–40 to 150
for additional packing options.
(+) magnetic fields must be of sufficient strength.
3
This variant is in production, however, it has been deemed Pre-End of Life. The product is approaching end of life. Within a minimum of 6 months, the device
will enter its final, Last Time Buy, order phase. Status change: January 31, 2011. Suggested replacement: A1190LLHLX-T.
4
Variant is in production but has been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of the variant is currently restricted to
existing customer applications. The variant should not be purchased for new design applications because obsolescence in the near future is probable. Samples
are no longer available. Status change: January 31, 2011.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
B
T
A
T
J
(max)
T
stg
Range E
Range L
Notes
Rating
28
–18
Unlimited
–40 to 85
–40 to 150
165
–65 to 170
Units
V
V
G
ºC
ºC
ºC
ºC
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2
A1180, A1181,
A1182,
and
A1183
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
ELECTRICAL CHARACTERISTICS
over the operating voltage and temperature range, unless otherwise specified
Characteristic
Supply Voltage
1
Symbol
V
CC
I
CC(L)
I
CC(H)
Supply Zener Clamp Voltage
Supply Zener Clamp Current
Reverse Supply Current
Output Slew
Rate
3
V
Z(supply)
I
Z(supply)
I
RCC
di/dt
f
C
t
on
POS
After factory trimming; with and without
bypass capacitor (C
BYP
= 0.01
μF)
t
on
≤
t
on(max)
;
V
CC
slew rate
≥
25 mV/μs
Test Conditions
Device powered on
B >B
OP
for A1180; B <B
RP
for A1181
B >B
OP
for A1182; B <B
RP
for A1183
B >B
OP
for A1181, A1183
B <B
RP
for A1180, A1182
I
CC
= I
CC(L)(max)
+ 3 mA; T
A
= 25°C
V
Z(supply)
= 28 V
V
RCC
= –18 V
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
Min.
3.5
2
5
12
28
–
–
–
–
–
–
Typ.
–
–
–
–
–
–
–
36
200
–
HIGH
Max.
24
5
6.9
17
40
I
CC(L)(max)
+ 3 mA
–1.6
–
–
25
–
Units
V
mA
mA
mA
V
mA
mA
mA/μs
kHz
μs
–
Supply Current
2
Chopping Frequency
Power-On Time
4
Power-On State
5,6
1
V
CC
represents
2
Relative values
the generated voltage between the VCC pin and the GND pin.
of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity
fi
eld (or a weaker north polarity
fi
eld, if present).
3
Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
4
Measured with and without bypass capacitor of 0.01
μF.
Adding a larger bypass capacitor causes longer Power-On Time.
5
POS is defined as true only with a V
CC
slew rate of 25 mV /
μs
or greater. Operation with a V
CC
slew rate less than 25 mV /
μs
can permanently harm
device performance.
6
POS is undefined for t > t or B
on
RP
< B < B
OP
.
MAGNETIC CHARACTERISTICS
1
over the operating voltage and temperature range, unless otherwise specified
Characteristic
Programmable Operate Point Range
Initial Operate Point Range
Switchpoint Step Size
2
Number of Programming Bits
Temperature Drift of B
OP
Hysteresis
1
Relative
Symbol
B
OPrange
B
OPinit
B
RES
–
Test Conditions
I
CC
= I
CC(H)
for A1180 and A1182
I
CC
= I
CC(L)
for A1181 and A1183
V
CC
= 12 V
V
CC
= 5 V, T
A
= 25°C
Switchpoint setting
Programming locking
Min.
60
–
4
–
–
–
Typ.
–
33
8
5
1
–
15
Max.
200
60
12
–
–
±20
30
Units
G
G
G
Bit
Bit
G
G
∆B
OP
B
HYS
B
HYS
= B
OP
– B
RP
5
values of B use the algebraic convention, where positive values indicate south magnetic polarity, and negative values indicate north magnetic
polarity; therefore greater B values indicate a stronger south polarity
fi
eld (or a weaker north polarity
fi
eld, if present).
2
The range of values specified for B
RES
is a maximum, derived from the cumulative programming bit errors.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3
A1180, A1181,
A1182,
and
A1183
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
Characteristic Data
I
CC(L)
versus Ambient Temperature
at Various Levels of V
CC
(A1182, A1183)
10
8
I
CC(L)
(mA)
V
CC
(V)
V
CC
(V)
6
4
2
0
3.5
12
24
3.5
12
I
CC(L)
versus Ambient Temperature
at Various Levels of V
CC
(A1180, A1181)
10
8
I
CC(L)
(mA)
6
4
2
0
-50
0
50
100
150
200
24
-50
0
50
100
150
200
Ambient Temperature, T
A
(°C)
Ambient Temperature, T
A
(°C)
I
CC(H)
versus Ambient Temperature
at Various Levels of V
CC
(A1180, A1181, A1182, A1183)
20
18
I
CC(H)
(mA)
V
CC
(V)
16
14
12
10
-50
3.5
12
24
0
50
100
150
200
Ambient Temperature, T
A
(°C)
Average B
OP
Bits versus Ambient Temperature
(A1180, A1181, A1182, A1183)
Hysteresis versus Ambient Temperature
at Various Levels of V
CC
(A1180, A1181, A1182, A1183)
30
B
OPinit
B
it 1
B
it 2
B
it 3
B
it 4
B
it 5
25
B
HYS
(G)
20
15
10
5
V
CC
(V)
3.5
12
24
200
Average B
OP
(G)
175
150
125
100
75
50
25
0
-50
0
50
100
150
200
-50
0
50
100
150
200
Ambient Temperature, T
A
(°C)
Ambient Temperature, T
A
(°C)
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
A1180, A1181,
A1182,
and
A1183
Sensitive Two-Wire Field-Programmable
Chopper-Stabilized Unipolar Hall Effect Switches
Device Qualification Program
Contact Allegro for information.
EMC (Electromagnetic Compatibility) Requirements
Contact your local representative for EMC results.
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