ARS19200LUBATN-H [ALLEGRO]
ASIL-Compliant Wheel Speed Sensor IC;型号: | ARS19200LUBATN-H |
厂家: | ALLEGRO MICROSYSTEMS |
描述: | ASIL-Compliant Wheel Speed Sensor IC |
文件: | 总11页 (文件大小:646K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
DESCRIPTION
2
-
FEATURES AND BENEFITS
• Integrated diagnostics and certified safety design process
The ARS19200 is a Hall-effect-based integrated circuit (IC)
thatprovidesauser-friendlysolutionfortruezero-speeddigital
ring magnet sensing in two-wire applications. TheARS19200
is offered in the UB package, which integrates the IC and a
hightemperatureceramiccapacitorinasingleovermoldedSIP
package. The integrated capacitor provides enhanced EMC
performance with reduced external components.
for ASIL B compliance
• Integrated capacitor reduces need for external EMI
protection components
• True zero-speed operation
• Single chip sensing IC for high reliability
• Fully synchronous digital logic with Scan and IDDQ
testing
• Application-proven algorithms for robust operation in
wheel speed environments
TheICisideallysuitedforobtainingspeedinformationinwheel
speed applications. The Hall element spacing is optimized for
high resolution, small diameter targets. The package is lead
(Pb) free, with tin leadframe plating.
PACKAGE: 2-pin SIP (suffix UB)
Not to scale
Functional Block Diagram
VCC
Internal Regulator
Analog to
Offset
Adjust
Output
Control
Digital
Controller
Amp
AGC
Digital
Converter
GND
ARS19200-DS, Rev. 3
MCO-0000375
May 18, 2018
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
SELECTION GUIDE
Part Number
Packing
Power-On State
ICC(LOW)
ARS19200LUBATN-L
ARS19200LUBATN-H
4000 pieces per 13-in. reel
4000 pieces per 13-in. reel
ICC(HIGH)
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
VCC
Notes
Rating
28
Unit
V
Supply Voltage
Reverse Supply Voltage
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
VRCC
TA
–18
V
L temperature range
–40 to 150
165
°C
°C
°C
TJ(max)
Tstg
–65 to 170
INTERNAL DISCRETE CAPACITOR RATINGS
Characteristic
Symbol
Test Conditions
Value (Typ.)
Unit
Nominal Capacitance
CSUPPLY
Connected between VCC and GND
2200
pF
Terminal List Table
Name
Number
Function
1
2
VCC
1
Supply Voltage
Ground
GND
2
UB Package, 2-Pin SIP Pinout Diagram
2
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
OPERATING CHARACTERISTICS: Valid throughout full operating and temperature ranges, unless otherwise specified
Characteristic
ELECTRICAL CHARACTERISTICS
Supply Voltage [2]
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
VCC
VCC(UV)
IRCC
Operating, TJ < TJ(max)
4.0
–
–
3.6
–
24
3.95
–10
–
V
V
Undervoltage Lockout
Reverse Supply Current [3]
Supply Zener Clamp Voltage
Supply Zener Current
VCC 0 → 5 V or 5 → 0 V
VCC = VRCC(max)
–
mA
V
VZSUPPLY ICC = ICC(max) + 3 mA, TA = 25°C
IZSUPPLY TA = 25°C, VCC = 28 V
28
–
–
–
19
mA
OUTPUT
-H variant
POS
–
–
ICC(HIGH)
–
–
–
Power-On State
Supply Current
-L variant
ICC(LOW)
–
ICC(LOW) Low-current state
ICC(HIGH) High-current state
5.9
12
–
–
8.4
16
mA
mA
ICC(HIGH) / Measured as ratio of high current to low current
ICC(LOW) (isothermal)
Supply Current Ratio
ASIL Safety Current
Output Rise, Fall Time
1.9
1.0
0
–
–
–
–
–
IRESET
3.3
1.5
mA
μs
Corresponds to measured output slew rate with
CSUPPLY; RLOAD = 100 Ω, CL = 10 pF
tr, tf
OPERATING CHARACTERISTICS
Operate Point
BOP
BRP
fFWD
% of peak-to-peak IC-processed magnetic signal
% of peak-to-peak IC-processed magnetic signal
–
–
0
60
40
–
–
–
5
%
%
Release Point
Operating Frequency
kHz
Continued on the next page…
ꢀ
CC
1
ꢀCC
ARS19200
ꢁNꢂ
ꢃ
R
100 Ω
L
C
L
Figure 1: Typical Application Circuit
3
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
OPERATING CHARACTERISTICS (continued): Valid throughout full operating and temperature ranges, unless otherwise
specified
Characteristic
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
OPERATING CHARACTERISTICS (continued)
Input Signal
BSIG
BSIGEXT
TC
Differential signal, measured peak-to-peak
20
–
–
1200
300
G
G
Allowable User-Induced Differential
Offset
External differential signal bias (DC), operating
within specification
–300
Sensitivity Temperature Coefficient [4]
Total Pitch Deviation
–
–
+0.2
–
–
%/°C
%
For constant BSIG, sine wave
±2
No missed output edge. Instantaneous
Maximum Sudden Signal Amplitude
Change
BSEQ(n+1) symmetric magnetic signal amplitude change,
/ BSEQ(n) measured as a percentage of peak-to-peak BSIG
(see Figure 2)
–
–
0.6
0.2
–
–
–
–
Overall symmetric magnetic signal amplitude
change, measured as a percentage of peak-to-
Maximum Total Signal Amplitude
Change
BSEQ(max)
/BSEQ(min)
peak BSIG
[1] Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits.
[2] Maximum voltage must be adjusted for power dissipation and junction temperature; see representative discussions in Power Derating section.
[3] Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.
[4] Ring magnets decrease strength with rising temperature. Device compensates. Note that BSIG requirement is not influenced by this.
B
SEQ(n)
B
SEQ(n+1)
Figure 2: Differential Signal Variation
4
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
THERMAL CHARACTERISTICS
Characteristic
Symbol
Test Conditions*
Value
Unit
Package Thermal Resistance
RθJA
Single-layer PCB with copper limited to solder pads
213
°C/W
*Additional thermal information is available on the Allegro website.
Power Derating Curve
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
VCC(max)
8
7
6
5
4
VCC(min)
3
2
20
40
60
80
100
120
140
160
180
Temperature (ºC)
Power Dissipation versus Ambient Temperature
1900
1800
1700
1600
1500
1400
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
20
40
60
80
100
120
140
160
180
Temperature (ºC)
5
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
FUNCTIONAL DESCRIPTION
Determining Output Signal Polarity
Hall Technology
In Figure 5, the top panel, labeled Mechanical Position, repre-
sents the mechanical features of the ring magnet or gear target
and orientation to the device. The bottom panel, labeled Device
Output Signal, displays the square waveform corresponding
to the digital output signal that results from a rotating target
configured as shown in Figure 4. That direction of rotation (of
the target side adjacent to the package face) is: perpendicular to
the leads, across the face of the device, from the pin 1 side to the
pin 2 side. This results in the device output switching from high
to low output state as a north magnetic pole passes the device
face. In this configuration, the device output voltage switches to
its high polarity when a south pole is the target feature nearest to
the device. If the direction of rotation is reversed or if a part of
type ARS19200LUBx-L is used, then the output polarity inverts
(see Table 1).
This single-chip differential Hall-effect sensor IC contains two
Hall elements as shown in Figure 3, which simultaneously sense
the magnetic profile of the ring magnet or gear target. The mag-
netic fields are sensed at different points (spaced at a 1.75 mm
pitch), generating a differential internal analog voltage, VPROC
,
that is processed for precise switching of the digital output signal.
The Hall IC is self-calibrating and also possesses a temperature-
compensated amplifier and offset cancellation circuitry. Its
voltage regulator provides supply noise rejection throughout the
operating voltage range. Changes in temperature do not greatly
affect this device due to the stable amplifier design and the offset
rejection circuitry. The Hall transducers and signal processing
electronics are integrated on the same silicon substrate, using a
proprietary BiCMOS process.
Target Profiling During Operation
An operating device is capable of providing digital information
that is representative of the mechanical features of a rotating
gear or ring magnet. The waveform diagram in Figure 5 presents
the automatic translation of the mechanical profile, through the
magnetic profile that it induces, to the digital output signal of the
ARS19200. No additional optimization is needed and minimal
processing circuitry is required. This ease of use reduces design
time and incremental assembly costs for most applications.
Table 1: Output Polarity when a South Pole Passes the
Package Face in the Indicated Rotation Direction
Part Type
Rotation Direction
ARS19200LUBx-H
ICC(HIGH)
ARS19200LUBx-L
ICC(LOW)
Pin 1 → Pin 2
Pin 2 → Pin 1
ICC(LOW)
ICC(HIGH)
Branded Face
of Package
Rotating Target
(Ring magnet or
ferromagnetic)
Ring Magnet
S
N
S
N
N
S
S
N
Target
N
S
S
N
Ferromagnetic
Target
Tooth
Valley
Pin 1
Pin 2
Element Pitch
Hall Element 1
Rotation from pin 1 to pin 2
Hall Element 2
Package Case Branded Face
(Top View of
Package Case)
Pin 2
Side
Pin 1
Side
IC
Branded Face
of Package
Rotating Target
(Ring magnet or
ferromagnetic)
South Pole
North Pole
Back-Biasing Magnet
(Externally applied for
ferromagnetic target)
N
S
S
N
N
S
S
N
Pin 1
Pin 2
Rotation from pin 2 to pin 1
Figure 3: Relative Motion of the Target
Figure 4: Target Orientation Relative to Device
(ring magnet shown).
Relative Motion of the Target is detected by the dual Hall elements
mounted on the Hall IC.
6
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
Element Pitch
Package Case Branded Face
Package Case
Branded Face
Device Orientation to Target
Device Orientation to Target
(Top View of
Package Case)
(Top View of
Package Case)
(Pin 1 Side)
(Pin 2 Side)
E2
(Pin 1 Side)
Element Pitch
IC
(Pin 2 Side)
E2
E1
IC
E1
South Pole
North Pole
External
Back-Biasing Magnet
Mechanical Position (Target moves past device pin 1 to pin 2)
Mechanical Position (Target moves past device pin 1 to pin 2)
Target
This pole
sensed later
This pole
sensed earlier
(Radial Ring Magnet)
Target
(Ferromagnetic)
This tooth
sensed earlier
This tooth
sensed later
N
S
N
Target Magnetic Profile
Target Magnetic Profile
+B
Speed Channel
Element Pitch
Element Pitch
+B
–B
IC Internal Differential Analog Signals, VPROC
IC Internal Differential Analog Signals, VPROC
BOP(#1)
BOP(#2)
BOP(#1)
BOP(#2)
Speed
Channel
BRP(#1)
BRP(#1)
Device Output Signal,IOUT
Device Output Signal,IOUT
+t
+t
Figure 5: Basic Operation
7
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
Magnetic
ꢂncoder
S
ꢀ
S
ꢀ
S
ꢀ
ꢅCCꢆHꢅꢇHꢈ
ꢅCCꢆLꢀꢉꢈ
Normal
ꢀꢁeration
ꢅCCꢆHꢅꢇHꢈ
ꢂrror
ꢂrror
ꢂꢃamꢁle 1
ꢅCCꢆLꢀꢉꢈ
ꢅRꢂSꢂꢊ
ꢅCCꢆHꢅꢇHꢈ
ꢂrror
ꢂrror
ꢂꢃamꢁle ꢄ
ꢅCCꢆLꢀꢉꢈ
ꢅRꢂSꢂꢊ
Figure 6: Output Protocol with ASIL Safety Current
8
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
POWER DERATING
The device must be operated below the maximum junction
temperature of the device, TJ(max). Under certain combinations of
peak conditions, reliable operation may require derating supplied
power or improving the heat dissipation properties of the appli-
cation. This section presents a procedure for correlating factors
affecting operating TJ. (Thermal data is also available on the
Allegro MicroSystems website.)
A worst-case estimate, PD(max), represents the maximum allow-
able power level (VCC(max), ICC(max)), without exceeding TJ(max)
at a selected RθJA and TA.
,
Example: Reliability for VCC at TA=150°C, package UB, using
minimum-K PCB.
Observe the worst-case ratings for the device, specifically:
RθJA=213°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
ICC(max) = 16 mA.
The Package Thermal Resistance, RθJA, is a figure of merit sum-
marizing the ability of the application and the device to dissipate
heat from the junction (die), through all paths to the ambient air.
Its primary component is the Effective Thermal Conductivity, K,
of the printed circuit board, including adjacent devices and traces.
Radiation from the die through the device case, RθJC, is relatively
small component of RθJA. Ambient air temperature, TA, and air
motion are significant external factors, damped by overmolding.
Calculate the maximum allowable power level, PD(max). First,
invert equation 3:
ΔTmax = TJ(max) – TA = 165°C–150°C = 15°C
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
The effect of varying power levels (Power Dissipation, PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
P
D(max) = ΔTmax ÷RθJA =15°C÷213°C/W=70.4mW
Finally, invert equation 1 with respect to voltage:
CC(est) = PD(max) ÷ ICC(max) = 70.4mW÷16.0mA=4.4 V
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est)
V
PD = VIN
I
(1)
(2)
(3)
×
IN
ꢀ
ꢀ
ΔT = PD
R
θJA
×
.
TJ = TA + ΔT
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then reli-
able operation between VCC(est) and VCC(max) requires enhanced
RθJA. If VCC(est) ≥ VCC(max), then operation between VCC(est) and
VCC(max) is reliable under these conditions.
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 14 mA, and RθJA = 213 °C/W, then:
PD = VCC
I
= 12 V 14 mA = 168 mW
CC
×
×
ΔT = PD
R
= 168 mW 213°C/W = 35.8°C
θJA
×
×
TJ = TA + ΔT = 25°C + 35.8°C = 60.8°C
9
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
PACKAGE OUTLINE DRAWING
For Reference Only – Not for Tooling Use
(Reference DWG-0000408, Rev. 3)
Dimensions in millimeters
Dimensions exclusive of mold flash, gate burrs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
+0.06
4.00
–0.05
B
4 × ꢀ0°
E
1.75
1.50 0.05
E
1.125
0.65 0.07
C
E
1.54
Mold Ejector
Pin Indent
+0.06
4.00
E
E1
–0.07
E2
E
XXXXX
Date Code
Lot Number
Branded
45°
Face
A
0.85 0.05
4 × 2.50 0.ꢀ0
4 × 0.85 REF
0.25 REF
0.30 REF
0.42 0.05
D
Standard Branding Reference View
2.54 REF
Line 1 = Part Number (5 characters)
Line 2 = Date Code (4 digits)
Line 3 = Characters 5-8 of
Assembly Lot Number
ꢀ
2
18.00 0.10
A
Dambar removal protrusion (8×)
ꢀ.00 0.ꢀ0
ꢀ2.20 0.ꢀ0
4 × 7.37 REF
B
C
D
E
F
Gate and tie bar burr area
+0.07
–0.03
Active Area Depth, 0.38 0.03 mm
0.25
1.80
0.10
Branding scale and appearance at supplier discretion
Hall elements (E1 and E2); not to scale
Molded Lead Bar for preventing damage to leads during shipment
0.38 REF
0.25 REF
4 × 0.85 REF
0.85 0.05
+0.06
1.80
–0.07
F
+0.06
1.50 0.05
4.00
–0.05
Figure 7: Package UB, 2-Pin SIP
10
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
ARS19200
ASIL-Compliant Wheel Speed Sensor IC
Revision History
Number
Date
Description
–
1
2
March 9, 2017
May 19, 2017
July 11, 2017
Initial preliminary release
Corrected part number (page 2)
Removed Chopping references
Status changed from Preliminary to Final, removed tRESET, updated Figure 6, updated Package
Outline Drawing, and other editorial updates
3
May 18, 2018
Copyright ©2018, Allegro MicroSystems, LLC
Allegro MicroSystems, LLC reserves the right to make, from time to time, such departures from the detail specifications as may be required to
permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that
the information being relied upon is current.
Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of
Allegro’s product can reasonably be expected to cause bodily harm.
The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, LLC assumes no responsibility for its
use; nor for any infringement of patents or other rights of third parties which may result from its use.
Copies of this document are considered uncontrolled documents.
For the latest version of this document, visit our website:
www.allegromicro.com
11
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
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