APS12450
-
2
Three-Wire Hall-Effect Latch with Advanced Diagnostics
DESCRIPTION
The APS12450 three-wire planar Hall-effect sensor integrated
circuits (ICs) were developed in accordance with ISO 26262:2011
as a hardware safety element out of context with ASIL B
capability (pending assessment) for use in automotive safety-
related systems when integrated and used in the manner
prescribed in the applicable safety manual and datasheet. The
enhanced three-wire interface provides interconnect open/
short diagnostics and a fault state to communicate diagnostic
information while maintaining compatibility with legacy
three-wire systems. The continuous background diagnostics
are transparent to the host system and results in a reduced
fault tolerant time.
The APS12450 product options include magnetic switchpoints,
temperature coefficient, and output polarity. The response can
be matched to SmCo, NdFeB, or low-cost ferrite magnets. For
situations where a functionally equivalent three-wire switch
device is preferred, refer to the APS11450.
Continued on the next page…
• Functional safety
□
Developed in accordance with ISO 26262:2011 to meet
ASIL B requirements (pending assessment)
□
Integrated background diagnostics for:
○
Signal path
○
Regulator
○
Hall plate and bias
○
Overtemperature detection
○
Nonvolatile memory
□
Defined fault state
• Multiple product options
□
Magnetic polarity, switchpoints, and hysteresis
□
Temperature coefficient
□
Output polarity
• Reduces module bill-of-materials (BOM) and assembly cost
□
ASIL B sensor can replace redundant sensors
□
Integrated overvoltage clamp and reverse-battery diode
Continued on the next page…
FEATURES AND BENEFITS
PACKAGES
3-pin SOT23-W (LH)
3-pin ultramini SIP (UA)
Not to scale
•
•
•
•
•
•
•
TYPICAL APPLICATIONS
Automotive and industrial safety systems
Seat/window motors
Sun roof/convertible top/tailgate/liftgate actuation
Brake and clutch by wire actuators
Engine management actuators
Electric power steering (EPS)
Transmission shift actuator
VCC
R
EGULATOR
To All Subcircuits
D
YNAMIC
O
FFSET
C
ANCELLATION
Low-Pass
Filter
H
ALL
A
MP
.
S
AMPLE
, H
OLD
&
A
VERAGING
Schmitt Output
(Internal)
S
YSTEM
D
IAGNOSTICS
O
UTPUT
C
ONTROL
VOUT
C
LOCK
L
OGIC
GND
Functional Block Diagram
APS12450-DS, Rev. 1
MCO-0000562
April 23, 2019
APS12450
Three-Wire Hall-Effect Latch with Advanced Diagnostics
• Automotive-grade ruggedness and fault tolerance
□
Extended AEC-Q100 Grade 0 qualification
○
Operation to 175°C junction temperature
□
3 to 30 V operating voltage range
□
±8 kV HBM ESD
□
Overtemperature indication
FEATURES AND BENEFITS (continued)
APS12450 sensors are engineered to operate in the harshest
environments with minimal external components. They are qualified
beyond the requirements of AEC-Q100 Grade 0 and will survive
extended operation at 175°C junction temperature.
These monolithic ICs include on-chip reverse-battery protection,
overvoltage protection (e.g., 40 V load dump), ESD protection,
overtemperature detection, and an internal voltage regulator for
operation directly from an automotive battery bus. These integrated
features reduce the end-product bill-of-materials (BOM) and
assembly cost.
Package options include industry-standard surface-mount SOT (LH)
and through-hole SIP (UA) packages. Both packages are RoHS-
compliant and lead (Pb) free with 100% matte-tin-plated leadframes.
DESCRIPTION (continued)
SELECTION GUIDE
[1]
Part Number
APS12450LLHALX-0SLA
APS12450LLHALT-0SLA
APS12450LUAA-0SLA
APS12450LLHALX-1SLA
APS12450LLHALT-1SLA
APS12450LUAA-1SLA
APS12450LLHALX-3SLA
APS12450LLHALT-3SLA
APS12450LUAA-3SLA
[1]
Contact Allegro
Package
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through-hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through-hole
3-pin SOT23W surface mount
3-pin SOT23W surface mount
3-pin SIP through-hole
Packing
13-in. reel, 10,000 pieces/reel
7-in. reel, 3000 pieces/reel
bulk, 500 pieces/bag
13-in. reel, 10,000 pieces/reel
7-in. reel, 3000 pieces/reel
bulk, 500 pieces/bag
13-in. reel, 10,000 pieces/reel
7-in. reel, 3000 pieces/reel
bulk, 500 pieces/bag
Output Polarity
(B > B
OP
)
Low
Temperature
Coefficient
Magnetic
Operate Point,
B
OP
(typ)
22 G
0%/°C
Low
0%/°C
50 G
Low
0%/°C
150 G
MicroSystems for options not listed in the selection guide.
RoHS
COMPLIANT
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
APS12450
Three-Wire Hall-Effect Latch with Advanced Diagnostics
Complete Part
Number Format
Allegro Iden½fier (Device Family)
APS – Digital Posi½on Sensor
Configura½on Op½ons
Allegro Device Number
12450 – ASIL B Hall-effect Latch
APS12450 L L H A L T
-
0 S L C
Temperature Coefficient
A – Flat
B – -0.035 %/°C
C – -0.12 %/°C
D – -0.2 %/°C
Output Polarity for B > B
OP
H – High (Output Off)
L – Low (Output On)
Opera½ng Mode
S – Unipolar South Sensing
N – Unipolar North Sensing
Device Switch Threshold Magnitude
0 – 22 G B
OP
, -22 G B
RP
(typ.)
1 – 50 G B
OP
, -50 G B
RP
(typ.)
3 – 150 G B
OP
, -150 G B
RP
(typ.)
Instruc½ons (Packing)
LT – 7-in. reel, 3,000 pieces/reel (LH Only)
LX – 13-in. reel, 10,000 pieces/reel (LH Only)
TN – 13-in. reel, 4,000 pieces/reel (UA Only)
(no op½on code) – bulk, 500 pieces/bag (UA only)
Package Designa½on
LHA – 3-pin SOT23W Surface Mount
UAA – 3-pin SIP Through-Hole
Ambient Opera½ng Temperature Range
L – -40°C to +150°C
ABSOLUTE MAXIMUM RATINGS
Characteristic
Supply Voltage
[2]
Reverse Supply Voltage
Forward Output Voltage
Reverse Output Voltage
Output Current Sink
Maximum Junction Temperature
Storage Temperature
[2]
This
Symbol
V
CC
V
RCC
V
OUT
V
ROUT
I
OUT(SINK)
T
J(MAX)
T
stg
VCC to VOUT
For 500 hours
Notes
Rating
35
–30
30
–0.3
12
165
175
–65 to 170
Unit
V
V
V
V
mA
°C
°C
°C
rating does not apply to extremely short voltage transients such as load dump and/or ESD. Those events have individual ratings
specific to the respective transient voltage event. Contact your local field applications engineer for information on EMC test results.
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
APS12450
Three-Wire Hall-Effect Latch with Advanced Diagnostics
PINOUT DIAGRAMS AND TERMINAL LIST
GND
3
1
VCC
2
VOUT
1
VCC
2
GND
3
VOUT
LH Package, 3-Pin SOT23W Pinout
UA Package, 3-Pin SIP Pinout
Terminal List Table
Name
VCC
VOUT
GND
Pin Number
LH
1
2
3
UA
1
3
2
Function
Supply voltage
Output
Ground
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
4
APS12450
Three-Wire Hall-Effect Latch with Advanced Diagnostics
OPERATING CHARACTERISTICS:
Valid over full operating voltage and ambient temperature ranges for T
J
< T
J
(max),
unless otherwise specified
Characteristics
SUPPLY AND STARTUP
Supply Voltage
[2]
Supply Current
Power-On Time
[3]
Power-On State
Output Rise Time
Output Fall Time
Output On Voltage
Output Off Voltage
Output Off Voltage Overshoot
[4]
ON-BOARD PROTECTION
Fault Reaction Time
Diagnostics Fault Retry Time
[6]
Fault Mode Output Voltage
(Fault State)
Overtemperature Shutdown
Overtemperature Hysteresis
[1]
Typical
Symbol
V
CC
I
CC
t
on
POS
t
RISE
t
FALL
V
OUT(LOW)
V
OUT(HIGH)
V
OUT(HIGH)OVER
t
VOUT(H)OVER
t
DIAG
t
DIAGF
V
OUT(FAULT)
T
SD
T
JHYS
Test Conditions
Operating, T
J
< 165°C
V
CC
> V
CC
(min), B < B
RP
(min) – 10 G,
B > B
OP
(max) + 10 G
t < t
on(max)
See Applications Circuit, Figure 9;
V
PU
= V
CC
, R
PU
= 3 kΩ, C
OUT
= 1 nF,
I
OUT
< 12 mA
Output ratiometric to V
PU
;
V
PU
= V
CC
,
τ
< 3 µs
[5]
,
I
OUT
< 12 mA
Overshoot percentage relative to V
PU
(see Figure 8);
V
PU
= V
CC
,
τ
< 3 µs
[5]
,
I
OUT
< 12 mA
Duration of output voltage overshoot (V
OUT(HIGH)OVER
)
Min.
3.0
–
–
Typ.
[1]
–
–
–
V
OUT(FAULT)
Max.
30
4.5
150
Unit
V
mA
µs
–
2
2
10
70
–
–
–
–
> V
OUT(HIGH)
MAX
4
4
20
80
2
–
25
2
V
PU
205
25
15
15
30
90
–
5
60
–
–
–
–
µs
µs
%
%
%
µs
µs
ms
V
°C
°C
V
PU
= V
CC
,
τ
< 3 µs, I
OUT
< 12 mA
Temperature increasing
–
–
data is at T
A
= 25°C and V
CC
= 12 V and is for design information only.
[2]
V
represents the voltage between the VCC pin and the GND pin.
CC
[3]
Power-On Time (t
ON
) is measured from V
CC
= V
CC
(min) to 50% of the output transition
from V
PU
to final value. Adding a bypass capacitor will
increase Power-On Time.
[4]
The overshoot specification pertains only to conditions where the overshoot is greater than the V
OUT(HIGH)MAX
specification.
[5]
τ
is the time constant of the RC circuit;
τ
= R
PU
× C
OUT
.
[6]
The diagnostics fault retry repeats continuously until a fault condition is no longer observed. See Diagnostics Mode Operation section for details.
TRANSIENT PROTECTION CHARACTERISTICS:
Valid for T
A
= 25°C and C
BYP
= 0.1 µF, unless otherwise specified
Characteristics
PROTECTION
Forward Supply Zener
Clamp Voltage
Reverse Supply Zener
Clamp Voltage
Reverse Supply Current
V
Z
V
RCC
I
RCC
I
CC
(max) + 3 mA
I
CC
= –1 mA
V
RCC
= –30 V
35
–
–
–
–
–
–
–30
–5
V
V
mA
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
5
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