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Электронный компонент: A1184EUA-T

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A1184
A1184-DS, Rev. 2
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
Standard 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 A1184 device is a standard, two-wire, unipolar, Hall effect switches. The
operate point, B
OP
, can be field-programmed, after final packaging of the sensor
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 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
A1184 is 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.
Any output current level outside of these two ranges is a fault condition. The
A1184 also features on-chip transient protection, and a Zener clamp to protect
against overvoltage conditions on the supply line.
The output current of the A1184 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.
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.
2
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
A1184
Product Selection Guide
Functional Block Diagram
Amp
Regulator
Program/Lock
Low-Pass
Filter
GND
VCC
GND
Programming
Logic
Package UA Only
0.01 uF
V+
Offset
Clock/Logic
Dyna
mic
O
ffse
t
Ca
nce
ll
a
t
i
o
n
Sam
p
le
and
H
old
Part Number
Pb-
free
Packing
1
Mounting
Ambient, T
A
(C)
Output
South (+) Field
2
Supply Current at
Low Output, I
CC(L)
(mA)
A1184ELHLT
3
7-in. reel, 3000 pieces/reel
Surface mount
40 to 85
High
5 to 6.9
A1184ELHLT-T
Yes
A1184EUA
Bulk, 500 pieces/bag
4-pin SIP through hole
A1184EUA-T
Yes
A1184LLHLT
7-in. reel, 3000 pieces/reel
Surface mount
40 to 150
A1184LLHLT-T
Yes
A1184LUA
Bulk, 500 pieces/bag
4-pin SIP through hole
A1184LUA-T
Yes
a
Contact Allegro for additional packing options.
b
South (+) magnetic fields must be of sufficient strength.
c
These 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.
3
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
A1184
MAGNETIC CHARACTERISTICS
1
over the operating voltage and temperature range, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Programmable Operate Point Range
B
OPrange
I
CC
= I
CC(H)
300
600
G
Initial Operate Point Range
B
OPinit
V
CC
= 12 V
262
300
G
Switchpoint Step Size
2
B
RES
V
CC
= 5 V, T
A
= 25C
8
16
24
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.
ELECTRICAL CHARACTERISTICS
over the operating voltage and temperature range, 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
RP
5
6.9
mA
I
CC(H)
B >B
OP
12
17
mA
Supply Zener Clamp Voltage
V
Z(supply)
I
CC
= I
CC(L)(max)
+ 3 mA; T
A
= 25C
28
40
V
Supply Zener Clamp Current
3
I
Z(supply)
V
Z(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
.
4
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
A1184
Characteristic Data
0
2
4
6
8
10
-50
0
50
100
150
200
-50
0
50
100
150
200
-50
0
50
100
150
200
10
12
14
16
18
20
-50
0
50
100
150
200
0
100
200
300
400
500
600
700
5
10
15
20
25
30
I
CC(L)
versus Ambient Temperature
at Various Levels of V
CC
(A1184)
I
CC(H)
versus Ambient Temperature
at Various Levels of V
CC
(A1184)
Ambient Temperature, T
A
(C)
Ambient Temperature, T
A
(C)
I
CC(H)
(mA)
I
CC(L)
(mA)
Average B
OP
Bits versus Ambient Temperature
(A1184)
Ambient Temperature, T
A
(C)
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
(A1184)
Ambient Temperature, T
A
(C)
B
HYS
(G)
V
CC
(V)
3.5
12.0
24.0
B
OPinit
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
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 MicroSystems for information.
Contact your local representative for EMC results.
5
A1184-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Standard Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switch
A1184
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