A1180/81/82/83
Sensitive Two-Wire Field-Programmable Chopper-Stabilized
Unipolar Hall-Effect Switches
The A1180, A1181, A1182, and A1183 devices are sensitive, two-wire, unipolar,
Hall effect switches. The operate point, B
OP
, can be
fi
eld-programmed, after
fi
nal
packaging of the sensor and placement into the application. This advanced feature
allows the optimization of the sensor switching performance, by effectively
accounting for variations caused by mounting tolerances for the device and the
target magnet.
This family of devices are produced on the Allegro MicroSystems advanced
BiCMOS wafer fabrication process, 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 applica-
tion environments. Commonly found in a number of automotive applications,
the A1180-83 family of devices are utilized to sense: seat track position, seat belt
buckle presence, hood/trunk latching, and shift selector position.
Two-wire unipolar switches are particularly advantageous in price-sensitive appli-
cations, because they require one less wire than the more traditional open-collec-
tor 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 output current levels: switching
LOW
in the presence of a south polarity
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.
Package LH, 3-pin SOT
3
1. VCC
2. No connection
3. GND
NC
1
2
Package UA, 3-pin SIP
1. VCC
2. GND
3. GND
1
2
3
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, V
CC
..........................................
28 V
Reverse-Supply Voltage, V
RCC
........................
–18 V
Magnetic Flux Density, B .........................Unlimited
Operating Temperature
Ambient, T
A
, Range E..................
–40ºC to 85ºC
Ambient, T
A
, Range L................
–40ºC to 150ºC
Maximum Junction, T
J(max)
........................165ºC
Storage Temperature, T
S
..................
–65ºC to 170ºC
Features and Benefits
Chopper stabilization
Low switchpoint drift over operating
temperature range
Low stress sensitivity
Field-programmable for optimized
switchpoints
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 V to 24 V operation
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
A1180-DS, Rev. 2
A1180/81/82/83
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
Product Selection Guide
Part Number
A1180ELHLT
A1180ELHLT-T
A1180EUA
A1180EUA-T
A1180LLHLT
A1180LLHLT-T
A1180LUA
A1180LUA-T
A1181ELHLT
A1181ELHLT-T
A1181EUA
A1181EUA-T
A1181LLHLT
A1181LLHLT-T
A1181LUA
A1181LUA-T
A1182ELHLT
3
A1182ELHLT-T
A1182EUA
A1182EUA-T
A1182LLHLT
A1182LLHLT-T
A1182LUA
A1182LUA-T
A1183ELHLT
3
A1183ELHLT-T
A1183EUA
A1183EUA-T
A1183LLHLT
A1183LLHLT-T
A1183LUA
A1183LUA-T
1
Contact
Pb-
free
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
–
Yes
Packing
1
Mounting
Ambient, T
A
(°C)
Output
South (+) Field
2
Supply Current at
Low Output, I
CC(L)
(mA)
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
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
Surface mount
–40 to 85
4-pin SIP through hole
Low
Surface mount
–40 to 150
4-pin SIP through hole
2 to 5
Surface mount
–40 to 85
4-pin SIP through hole
High
Surface mount
–40 to 150
4-pin SIP through hole
Surface mount
–40 to 85
4-pin SIP through hole
Low
Surface mount
–40 to 150
4-pin SIP through hole
5 to 6.9
Surface mount
–40 to 85
4-pin SIP through hole
High
Surface mount
–40 to 150
4-pin SIP through hole
2
South
3
These
Allegro for additional packing options.
(+) magnetic fields must be of sufficient strength.
variants are in production but have been determined to be NOT FOR NEW DESIGN. This classification indicates that sale of this device is cur-
rently restricted to existing customer applications. The device should not be purchased for new design applications because obsolescence in the near
future is probable. Samples are no longer available. Status date change May 2, 2005.
A1180-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
2
A1180/81/82/83
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
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. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
3
A1180/81/82/83
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
Chopping Frequency
Power-On Time
4
Power-On State
5,6
1
V
CC
represents
2
Relative values
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
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
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
V
Z(supply)
I
Z(supply)
I
RCC
di/dt
f
C
t
on
POS
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
ΔB
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.
A1180-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
4
A1180/81/82/83
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
(A1180, A1181)
10
8
I
CC(L)
(mA)
6
4
2
0
-50
0
50
100
150
200
I
CC(L)
(mA)
V
CC
(V)
3.5
12
24
I
CC(L)
versus Ambient Temperature
at Various Levels of V
CC
(A1182, A1183)
10
8
V
CC
(V)
6
4
2
0
-50
0
50
100
150
200
3.5
12
24
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)
A1180-DS, Rev. 2
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
5
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