A1145 Datasheet PDF - Allegro MicroSystems

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A1145
Allegro MicroSystems

Part Number A1145
Description (A1145 / A1146) Ultrasensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
Page 12 Pages


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A1145 and A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Features and Benefits
Chopper stabilization
Low switchpoint drift over operating
temperature range
Low sensitivity to stress
Factory programmed at end-of-line for optimized
switchpoints
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 to 24 V operation
Packages: 3 pin SOT23W (suffix LH), and
3 pin SIP (suffix UA)
Description
The A1145 and A1146 devices are two-wire, unipolar, Hall
effect switches that are factory-programmed at end-of-line to
optimize ultrasensitive magnetic switchpoint accuracy. These
devices use a patented high frequency chopper-stabilization
technique, produced using the Allegro advanced BiCMOS
wafer fabrication process, to achieve magnetic stability and
to eliminate offset inherent in single-element devices exposed
to harsh application environments.
Commonly found in a number of automotive applications,
these switches are utilized to sense seat track position, seat
belt buckle presence, hood/trunk latching, and shift selector
position. Two-wire unipolar switches, such as the A1145
and A1146, are particularly advantageous in price-sensitive
applications because they require one less wire for operation
than do switches with the more traditional open-collector output.
Additionally, the system designer inherently gains diagnostics
because there is always output current flowing, which should
be in either of two narrow ranges. Any current level not within
these ranges indicates a fault condition. These devices also
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Not to scale
V+
VCC
Continued on the next page…
Functional Block Diagram
0.01 uF
Clock/Logic
Amp
Regulator
To All Subcircuits
Low-Pass
Filter
A1145-DS, Rev. 8
GND
Package UA Only
GND



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A1145 and
A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Description (continued)
feature on-chip transient protection and a Zener clamp to protect
against overvoltage conditions on the supply line.
The output currents of the A1146 switches HIGH in the presence
of a south (+) polarity magnetic field of sufficient strength, and
switches LOW otherwise, as in the presence of a weak field or a
north (–) polarity field. The A1145 has an opposite output: the
currents switch LOW in the presence of a south-polarity magnetic
field of sufficient strength, and switch HIGH otherwise.
Both versions are offered in two package styles. The LH is a SOT-
23W, miniature low-profile package for surface-mount applications.
The UA is a three-lead ultramini SIP for through-hole mounting.
Each package is available in a lead (Pb) free version (suffix, –T)
with 100% matte tin plated leadframe. Field-programmable versions
also available: A1185 and A1186.
Selection Guide
Part Number
A1145ELHLT-T
Pb-Free1
Packing2
Yes Tape and Reel, 3000 pieces/reel
Package
Surface Mount
Operating Ambient
Temperature, TA
(°C)
Output Level in
South (+) Field3
A1145EUA-T
A1145EUATI
A1145EUATI-T
A1145LLHLT-T
Yes Bulk Bag, 500 pieces/bag
Tape and Reel, 2000 pieces/reel
Yes
Yes Tape and Reel, 3000 pieces/reel
Through Hole
Surface Mount
–40 to 85
Low
A1145LUA-T
A1145LUATI
A1145LUATI-T
Yes Bulk Bag, 500 pieces/bag
Tape and Reel, 2000 pieces/reel
Yes
Through Hole
–40 to 150
A1146ELHLT-T
Yes Tape and Reel, 3000 pieces/reel
Surface Mount
A1146EUA-T
A1146EUATI
A1146EUATI-T
A1146LLHLT-T
Yes Bulk Bag, 500 pieces/bag
Tape and Reel, 2000 pieces/reel
Yes
Yes Tape and Reel, 3000 pieces/reel
Through Hole
Surface Mount
–40 to 85
High
A1146LUA-T
A1146LUATI
A1146LUATI-T
Yes Bulk Bag, 500 pieces/bag
Tape and Reel, 2000 pieces/reel
Yes
Through Hole
–40 to 150
1Pb-based variants are being phased out of the product line. Certain variants cited in this footnote are in production but have been determined to be
LAST TIME BUY. This classification indicates that sale of this device is currently 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 change:
October 31, 2006. Deadlilne for receipt of LAST TIME BUY ORDERS: April 27, 2007. These variants include: A1145ELHLT, A1145EUA, A1145LLHLT,
A1145LUA, A1146ELHLT, A1146EUA, A1146LLHLT, and A1146LUA.
2Contact Allegro for additional packing options.
3South (+) magnetic fields must be of sufficient strength.
Absolute Maximum Ratings
Characteristic
Supply Voltage
Reverse Supply Voltage
Magnetic Flux Density
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VCC
VRCC
B
TA
TJ(max)
Tstg
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.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com



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A1145 and
A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
ELECTRICAL CHARACTERISTICS over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max. Units
Supply Voltage1
Supply Current2
VCC
ICCL
ICCH
B > BOP for A1145; B < BRP for A1146
B > BOP for A1146; B < BRP for A1145
3.5 – 24 V
5 – 6.9 mA
12 – 17 mA
Reverse Supply Current
Supply Zener Clamp Voltage
Supply Zener Clamp Current3
Output Slew Rate4
IRCC
VZSUPPLY
IZSUPPLY
di/dt
VRCC = –18 V
ICC = ICCL(max) + 3 mA; TA = 25°C
VZSUPPLY = 28 V
Capacitance of the oscilloscope performing
the measurement = 20 pF
28
– –1.6 mA
– 40 V
– 9.9 mA
36 – mA/μs
Chopping Frequency
fC
– 200 – kHz
Power-On Time5
ton CBYPASS = 0.01 μF
– – 25 μs
Power-On State6,7
POS
t < ton; VCC slew rate > 25 mV/μs
– HIGH –
1VCC represents the generated voltage between the VCC pin and the GND pin.
2Relative 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 field (or a weaker north polarity field, if present).
3IZSUPPLY(max) = ICCL(max) + 3 mA.
4Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
5Measured with and without bypass capacitor of 0.01 μF. Adding a larger bypass capacitor causes longer Power-On Time.
6POS is defined as true only with a VCC slew rate of 25 mV / μs or greater. Operation with a VCC slew rate less than 25 mV / μs can permanently harm
device performance.
7POS is undefined for t > ton or BRP < B < BOP.
MAGNETIC CHARACTERISTICS over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min. Typ.* Max. Units
Operate Point
BOP
A1145 ICC = ICCL
A1146 ICC = ICCH
20 37 60 G
Release Point
BRP
A1145 ICC = ICCH
A1146 ICC = ICCL
10 22 55 G
Hysteresis
BHYS
BHYS = BOP – BRP
5 15 30 G
*Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions, such as TA = 25°C and VCC = 12 V.
Performance may vary for individual units, within the specified maximum and minimum limits.
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com



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A1145 and
A1146
Ultrasensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Characteristic Data
Supply Current (Low) versus Ambient Temperature
at Various Levels of VCC
(A1145 and A1146)
10
8
VCC
6 3.5 V
12.0 V
4 24.0 V
2
0
–50 0
50 100 150 200
Ambient Temperature, TA (°C)
Operate Point versus Ambient Temperature
at Various Levels of VCC
(A1145 and A1146)
70
60
50
40
30
20
10
0
–50 0
50 100 150 200
Ambient Temperature, TA (°C)
VCC
3.5 V
12.0 V
24.0 V
Supply Current (High) versus Ambient Temperature
at Various Levels of VCC
(A1145 and A1146)
20
18
VCC
16 3.5 V
12.0 V
14 24.0 V
12
10
–50
0 50 100 150
Ambient Temperature, TA (°C)
200
Switchpoint Hysteresis versus Ambient Temperature
at Various Levels of VCC
(A1145 and A1146)
40
35
30
25 VCC
20
3.5 V
12.0 V
15 24.0 V
10
5
0
–50 0
50 100 150 200
Ambient Temperature, TA (°C)
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com



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