ChipFind - документация

Электронный компонент: A1140LUA

Скачать:  PDF   ZIP
A1140/41/42/43
A1140-DS
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
Sensitive Two-Wire Chopper-Stabilized
Unipolar Hall-Effect Switches
Package LH, 3-pin SOT
Features and Benefi ts
1. VCC
2. No connection
3. GND
The A1140, A1141, A1142, and A1143 devices are sensitive, two-wire, unipo-
lar, Hall effect switches that are factory-programmed at end-of-line to optimize
magnetic switchpoint accuracy. These 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 application environments. Commonly found in a number of
automotive applications, the A1140-43 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-specifi ed ranges.
Any output current level outside of these two ranges is a fault condition. The
A1140-43 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 A1141 and A1143 switch
HIGH
in the presence of a south
polarity magnetic fi eld of suffi cient strength; and switch
LOW
otherwise, including
when there is no signifi cant magnetic fi eld present. The A1140 and A1142 have
inverted output current levels: switching
LOW
in the presence of a south polarity
magnetic fi eld of suffi cient strength, and
HIGH
otherwise. The devices also differ in
their specifi ed
LOW
current supply levels.
All family members are offered in two package styles: SOT-23W, a miniature low-
profi le package for surface-mount applications (suffi x LH), and TO-92, three-
lead ultra-mini Single Inline Package (SIP) for through-hole mounting
(suffi x UA).
Field-programmable versions are also available. Refer to: A1180, A1181, A1182,
and A1183.
NC
1
2
3
PTCT
1
2
3
1. VCC
2. GND
3. GND
Package UA, 3-pin SIP
Chopper stabilization
Low switchpoint drift over operating tem-
perature range
Low stress sensitivity
Factory programmed at end-of-line for
optimized switchpoints
2
A1140-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1140/41/42/43
Product Selection Guide
Use the complete part numbers when ordering
Part Number
Package
T
A
(C)
Supply Current at
Low Output, I
CC(L)
(mA)
Output
South
(+) Field
1
Other
Field
2
A1140ELH
Surface Mount
40 to 85
2 to 5
Low
High
A1140EUA
SIP
A1140LLH
Surface Mount
40 to 150
A1140LUA
SIP
A1141ELH
Surface Mount
40 to 85
2 to 5
High
Low
A1141EUA
SIP
A1141LLH
Surface Mount
40 to 150
A1141LUA
SIP
A1142ELH
Surface Mount
40 to 85
5 to 6.9
Low
High
A1142EUA
SIP
A1142LLH
Surface Mount
40 to 150
A1142LUA
SIP
A1143ELH
Surface Mount
40 to 85
5 to 6.9
High
Low
A1143EUA
SIP
A1143LLH
Surface Mount
40 to 150
A1143LUA
SIP
1
South (+) magnetic fi elds must be of suffi cient strength.
2
Includes north () magnetic fi elds of suffi cient strength, and weak fi elds of either polarity.
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
3
A1140-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1140/41/42/43
ELECTRICAL CHARACTERISTICS
over the operating voltage and temperature range, unless otherwise specifi ed
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Supply Voltage
V
CC
Device powered on
3.5
24
V
Supply Current
1
I
CC(L)
B >B
OP
for A1140; B <B
RP
for A1141
2
5
mA
B >B
OP
for A1142; B <B
RP
for A1143
5
6.9
mA
I
CC(H)
B >B
OP
for A1141, A1143
B <B
RP
for A1140, A1142
12
17
mA
Zener Clamp Supply Voltage
V
Z(supply)
I
CC
= I
CC(max)
+ 3 mA; T
A
= 25C
28
40
V
Zener Clamp Supply Current
2
I
Z(supply)
V
Z(supply)
= 28 V
10
mA
Output Slew Rate
3
di/dt
No bypass capacitor; capacitance of the
oscilloscope performing the measurement
= 20 pF
36
mA/s
Chopping Frequency
f
C
400
kHz
Power-On Time
4
t
on
After factory programming; with and without
bypass capacitor (C
BYP
= 0.01 F)
25
s
Power-On State
5
POS
t
on
t
on(max)
;
V
CC
slew rate 25 mV/s
HIGH
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 fi eld (or a weaker north polarity fi eld, if present).
2
The maximum value for I
Z(supply)
is equal to I
CC(L)MAX
+ 3 mA.
3
The value of di is the difference between 90% of I
CC(H)
and 10% of I
CC(L)
, and the value of dt is time period between those two points. The value of di/dt
depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in lower rates of change.
4
The value of t
on
depends on the value of the bypass capacitor, if one is used, with greater capacitances resulting in longer t
on
.
5
A V
CC
slew rate less than 25 mV/s affects device performance, both while powering-on and while running. For t
on
> t
on(max)
, and B
RP
< B < B
OP
, POS
is undefi ned.
MAGNETIC CHARACTERISTICS*
over the operating voltage and temperature range, unless otherwise specifi ed
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Operate Point
B
OP
I
CC(H)
I
CC(L)
for A1140, A1142
I
CC(L)
I
CC(H)
for A1141, A1143
50
85
115
G
Release Point
B
RP
I
CC(L)
I
CC(H)
for A1140, A1142
I
CC(H)
I
CC(L)
for A1141, A1143
45
110
G
Hysteresis
B
HYS
B
HYS
= B
OP
B
RP
5
15
30
G
*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 fi eld (or a weaker north polarity fi eld, if present).
4
A1140-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1140/41/42/43
Characteristic Data
0
2
4
6
8
10
10
12
14
16
18
20
55
60
65
70
75
80
85
90
95
100
105
110
50
0
50
100
150
200
5
10
15
20
25
30
50
0
50
100
150
200
I
CC(L)
versus Ambient Temperature
at Various Levels of V
CC
(A1140, A1141, A1142, A1143)
Switchpoint versus Ambient Temperature
(A1143)
Hysteresis versus Ambient Temperature
(A1143)
I
CC(H)
versus Ambient Temperature
at Various Levels of V
CC
(A1140, A1141, A1142, A1143)
40
25
150
40
25
150
Ambient Temperature, T
A
(C)
Ambient Temperature, T
A
(C)
Ambient Temperature, T
A
(C)
Ambient Temperature, T
A
(C)
V
CC
3.8 V
12.0 V
24.0 V
V
CC
3.8 V
12.0 V
24.0 V
I
CC(H)
(mA)
I
CC(L)
(mA)
B
OP
(G)
B
HYS
(G)
Device Qualifi cation Program
EMC (Electromagnetic Compatibility) Requirements
Test Name
Reference Specifi cation
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
A1140-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
115 Northeast Cutoff, Box 15036
www.allegromicro.com
Allegro MicroSystems, Inc.
Sensitive Two-Wire Chopper-Stabilized Unipolar Hall Effect Switches
A1140/41/42/43
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions
Min. Typ.
Max Units
Package Thermal Resistance
R
JA
Package LH, minimum-K PCB (single-sided with
copper limited to solder pads)
110
C/W
Package LH, low-K PCB (double-sided with
0.926 in
2
copper area)
228
C/W
Package UA, minimum-K PCB (single-sided with
copper limited to solder pads)
165
C/W
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
Maximum
Allowable
V
CC
(V)
T
J(max)
= 165C; I
CC
= I
CC(max)
Power Derating Curve
(R
JA
= 228 C/W)
Minimum-K PCB, Package LH
(R
JA
= 110 C/W)
Low-K PCB, Package LH
(R
JA
= 165 C/W)
Minimum-K 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)
T
J(max)
= 165C; V
CC
= V
CC(max)
; I
CC
= I
CC(max)
Maximum Power Dissipation, P
D(max)
(R
JA
= 165
C/W)
Minimum-K
PCB,
Package
UA
(R
JA
= 228
C/W)
Minim
um-K
PCB,
Packa
ge LH
(R
JA
= 110
C/W)
Low-K
PCB,
Pack
age
LH