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Электронный компонент: A1185LLHLT

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A1185 and A1186
A1185-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
AB SO LUTE MAX I MUM RAT INGS
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.................. 40C to 85C
Ambient,
T
A
, Range L................ 40C to 150C
Maximum
Junction,
T
J(max)
........................165C
Storage Temperature, T
S
.................. 65C to 170C
On-chip protection
Supply transient protection
Reverse-battery protection
On-board voltage regulator
3.5 V to 24 V operation
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized
Unipolar Hall-Effect Switches
Package LH, 3-pin SOT
Features and Benefits
1. VCC
2. No connection
3. GND
NC
1
2
3
1
2
3
1. VCC
2. GND
3. GND
Package UA, 3-pin SIP
Chopper stabilization
Low switchpoint drift over operating
temperature range
Low stress sensitivity
Field-programmable for optimized
switchpoints
The A1185 and A1186 are ultrasensitive, two-wire, unipolar Hall effect switches.
The operate point, B
OP
, can be field-programmed, after final packaging of the sen-
sor and placement into the application. This advanced feature allows the optimiza-
tion 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 new DABIC5
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 A1185 and A1186 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 flows in either of two narrowly-specified ranges.
This provides distinct current ranges for I
OUT(H)
and I
OUT(L)
. Any output current
level outside of these two ranges is a fault condition.
Other features of the A1185 and A1186 devices include on-chip transient protec-
tion and a Zener clamp on the power supply to protect against overvoltage condi-
tions on the supply line.
The output current of the A1186 switches
HIGH
in the presence of a south polarity
magnetic field of sufficient strength; and switches
LOW
otherwise, including when
there is no significant magnetic field present. The A1185 has an inverted output
current level: switching
LOW
in the presence of a south polarity magnetic field of
sufficient strength, and
HIGH
otherwise.
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: A1145 and A1146.
2
A1185-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1185 and A1186
Product Selection Guide
Functional Block Diagram
Amp
Regulator
Program/Lock
Low-Pass
Filter
GND
VCC
GND
Programming
Logic
Package UA Only
Offset
Adjust
Clock/Logic
Dyna
mic
O
ffse
t
Ca
nce
ll
a
t
i
o
n
Sam
p
le
and
H
old
To all
subcircuits
0.01 uF
V+
Part Number
Pb-
free
Packing
a
Mounting
Ambient, T
A
(C)
Output
South (+) Field
b
Supply Current at
Low Output, I
CC(L)
(mA)
A1185ELHLT
7-in. reel, 3000 pieces/reel
Surface mount
40 to 85
Low
5 to 6.9
A1185ELHLT-T
Yes
A1185EUA
Bulk, 500 pieces/bag
4-pin SIP through hole
A1185EUA-T
Yes
A1185LLHLT
7-in. reel, 3000 pieces/reel
Surface mount
40 to 150
A1185LLHLT-T
Yes
A1185LUA
Bulk, 500 pieces/bag
4-pin SIP through hole
A1185LUA-T
Yes
A1186ELHLT
7-in. reel, 3000 pieces/reel
Surface mount
40 to 85
High
A1186ELHLT-T
Yes
A1186EUA
Bulk, 500 pieces/bag
4-pin SIP through hole
A1186EUA-T
Yes
A1186LLHLT
7-in. reel, 3000 pieces/reel
Surface mount
40 to 150
A1186LLHLT-T
Yes
A1186LUA
Bulk, 500 pieces/bag
4-pin SIP through hole
A1186LUA-T
Yes
a
Contact Allegro for additional packing options.
b
South (+) magnetic fields must be of sufficient strength.
3
A1185-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1185 and A1186
ELECTRICAL CHARACTERISTICS
over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
1
V
CC
Device powered on
3.5
24
V
Supply Current
2
I
CC(L)
B >B
OP
for A1185; B <B
RP
for A1186
5
6.9
mA
I
CC(H)
B >B
OP
for A1186; B <B
RP
for A1185
12
17
mA
Supply Zener Clamp Voltage
V
ZSupply
I
CC
= I
CC(L)(Max)
+ 3 mA; T
A
= 25C
28
40
V
Supply Zener Clamp Current
3
I
ZSupply
V
Supply
= 28 V
9.9
mA
Reverse Supply Current
I
RCC
V
RCC
= 18 V
1.6
mA
Output Slew Rate
4
di/dt
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
36
mA/s
Chopping Frequency
f
C
200
kHz
Power-On Time
5
t
on
After factory trimming; with and without
bypass capacitor (C
BYP
= 0.01 F)
25
s
Power-On State
6,7
POS
t
on
t
on(max)
;
V
CC
slew rate > 25 mV/s
HIGH
1
V
CC
represents the generated voltage between the VCC pin and the GND pin.
2
Relative 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).
3
I
ZSUPPLY(max)
= I
CCL(max)
+ 3 mA.
4
Measured without bypass capacitor between VCC and GND. Use of a bypass capacitor results in slower current change.
5
Measured with and without bypass capacitor of 0.01 F. Adding a larger bypass capacitor causes longer Power-On Time.
6
POS is defined as true only with a V
CC
slew rate of 25 mV / s or greater. Operation with a V
CC
slew rate less than 25 mV / s can permanently harm
device performance.
7
POS is undefined for t > t
on
or B
RP
< B < B
OP
.
MAGNETIC CHARACTERISTICS
1
over the operating voltage and temperature ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Programmable Operate Point Range
B
OPrange
I
CC
= I
CC(L)
for A1185
I
CC
= I
CC(H)
for A1186
10
60
G
Initial Operate Point Range
B
OPinit
V
CC
= 12 V
10
10
G
Switchpoint Step Size
2
B
RES
V
CC
= 5 V, T
A
= 25C
2
4
6
G
Number of Programming Bits
Switchpoint setting
5
Bit
Programming locking
1
Bit
Temperature Drift of B
OP
B
OP
20
G
Hysteresis
B
HYS
B
HYS
= B
OP
B
RP
5
15
30
G
1
Relative 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).
2
The range of values specified for B
RES
is a maximum, derived from the cumulative programming bit errors.
4
A1185-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1185 and A1186
Characteristic Data
0
2
4
6
8
10
-50
0
50
100
150
200
0
1
2
3
4
6
5
-50
0
50
100
150
200
10
12
14
16
18
20
-50
0
50
100
150
200
0
10
10
20
20
30
40
50
60
70
5
10
15
20
25
30
35
40
I
CC(L)
versus Ambient Temperature
at Various Levels of V
CC
(A1185 and A1186)
I
CC(H)
versus Ambient Temperature
at Various Levels of V
CC
(A1185 and A1186)
Ambient Temperature, T
A
(C)
Ambient Temperature, T
A
(C)
I
CC(H)
(mA)
I
CC(L)
(mA)
B
OP
Set by Specific Programming Bit
V
CC
= 12 V
T
A
= 25C
(A1185 and A1186)
Bit Number
B
OP
(G)
V
CC
(V)
3.5
12.0
24.0
V
CC
(V)
3.5
12.0
24.0
Hysteresis versus Ambient Temperature
at Various Levels of V
CC
(A1185 and A1186)
Ambient Temperature, T
A
(C)
B
HYS
(G)
V
CC
(V)
3.5
12.0
24.0
Device Qualification Program
EMC (Electromagnetic Compatibility) Requirements
Test Name
Reference Specification
ESD Human Body Model
AEC-Q100-002
ESD Machine Model
AEC-Q100-003
Conducted Transients
ISO 7637-1
Direct RF Injection
ISO 11452-7
Bulk Current Injection
ISO 11452-4
TEM Cell
ISO 11452-3
Contact Allegro for information.
Contact your local representative for EMC results.
5
A1185-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Ultrasensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1185 and A1186
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value Units
Package Thermal Resistance
R
JA
Package LH, 1-layer PCB with copper limited to solder pads
228
C/W
Package LH, 2-layer PCB with 0.463 in.
2
of copper area each side
connected by thermal vias
110
C/W
Package UA, 1-layer PCB with copper limited to solder pads
165
C/W
*Additional thermal information available on Allegro Web site.
6
7
8
9
2
3
4
5
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
20
40
60
80
100
120
140
160
180
Temperature (C)
Maximum
Allowable
V
CC
(V)
Power Derating Curve
(R
JA
= 228 C/W)
1-layer PCB, Package LH
(R
JA
= 110 C/W)
2-layer PCB, Package LH
(R
JA
= 165 C/W)
1-layer PCB, Package UA
V
CC(min)
V
CC(max)
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
1300
1400
1500
1600
1700
1800
1900
20
40
60
80
100
120
140
160
180
Temperature (C)
P
o
w
e
r
D
i
s
s
i
pa
ti
on
,
P
D
(m
W)
Power Dissipation versus Ambient Temperature
(R
JA
= 165
C/
W)
1-laye
r PCB,
Packag
e UA
(R
JA
= 228
C/W
)
1-lay
er PCB,
Package
LH
(R
JA
=
110
C/W)
2-layer
PCB,
Package
LH