ATS19420LSNBTN-A [ALLEGRO]
High-Accuracy Hall-Effect Transmission Speed Gear Tooth Sensor IC;
| 型号： | ATS19420LSNBTN-A |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | High-Accuracy Hall-Effect Transmission Speed Gear Tooth Sensor IC |
| 文件： | 总12页 (文件大小：859K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ATS19420
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
FEATURES AND BENEFITS
• Differential Hall-effect sensor measures ferrous targets
DESCRIPTION
The ATS19420 is an advanced Hall-effect integrated circuit
(IC)thatusesafullyintegratedback-biasedmagnettomeasure
the speed of rotating ferrous targets. The package features an
integratedcapacitorforelectromagneticcompatibility(EMC).
with inherent stray field immunity
• SolidSpeed Digital Architecture™ supports advanced
algorithms, maintaining pitch and duty cycle accuracy
during dynamic air gap disturbances
• Integrated solution includes back-biased magnet and
capacitor in a single overmolded package
• ISO 26262:2011 ASIL B with integrated diagnostics and
certified safety design process (pending assessment)
• Two-wire current source output protocol supporting
speed and ASIL error reporting
• EEPROM enables factory traceability throughout
product life cycle
The ATS19420 SolidSpeed Digital Architecture™ offers
intelligent algorithms capable of stable operation during
sudden and dynamic air gap movements. The sophisticated
digital controller provides highly accurate speed detection
idealfortransmissionapplications.Inaddition,theATS19420
differential sensing offers inherent rejection of interfering
common-mode magnetic fields.
The ATS19420 was developed in accordance with
ISO26262:2011asahardwaresafetyelementoutofcontextwith
ASILB 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.
2
-
TheATS19420 is provided in a 3-pin SIPpackage (suffix SN)
that is lead (Pb) free, with tin leadframe plating. The SN
package includes an IC, magnet, and capacitor integrated
into a single overmolded package, with an additional molded
lead-stabilizing bar for robust shipping and ease of assembly.
PACKAGE:
3-Pin SIP
(suffix SN)
Not to scale
Functional Block Diagram
EMC
Regulator
(Analog)
EEPROM
Diagnostics
VCC
GND
Regulator
(Digital)
Oscillator
Hall
Elements
Output
Output
Controller
Synchronous Digital Controller
Amp
ADC
ATS19420-DS
MCO-0000725
October 31, 2019
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
SELECTION GUIDE [1]
Part Number
Packing
Tape and reel, 13-in. reel, 800 pieces per reel
ATS19420LSNBTN
[1] Not all combinations are available. Contact Allegro sales for availability and pricing of
custom programming options.
Configuration Options
ATS19420 L
SNB
TN-
ASIL Protocol:
-A ASIL protocol enabled (pending assessment)
[blank] – ASIL protocol disabled
Packing Instructions
Package Designation
Operating Temperature Range
Allegro Identifier and Device Type
2
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
VCC
Notes
Refer to Power Derating section
Rating
28
Unit
V
Supply Voltage
Reverse Supply Voltage
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
VRCC
TA
–18
V
–40 to 150
165
°C
°C
°C
TJ(max)
Tstg
–65 to 170
VCC
1
PINOUT DIAGRAM
ATS19420
IC
1
2
3
3
GND
VOUT = ICC × RL
SN Package, 3-Pin SIP
CL
RL
PINOUTS
Name
Number
Function
VCC
1
2
3
Supply Voltage
Supply Voltage
Ground
VCC
GND
Figure 1: Typical Application Circuit
INTERNAL DISCRETE CAPACITOR RATINGS
Characteristic
Symbol
Notes
Value (Typ.)
Unit
Nominal Supply Capacitance
CSUPPLY
Connected between pin 1 and pin 3 (refer to Figure 1)
10
nF
3
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
OPERATING CHARACTERISTICS: Valid over operating ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
ELECTRICAL SUPPLY CHARACTERISTICS
Voltage across VCC and GND; does not include
voltage across RL; see Figure 1
Supply Voltage [2]
VCC
4
–
24
V
Undervoltage Lockout
VCC(UV)
IRCC
VCC 0 V → 5 V or 5 V → 0 V
VCC = VRCC(max)
–
3.6
–
3.95
–
V
Reverse Supply Current [3]
–10
5.9
12
mA
mA
mA
ICC(LOW)
Low-current state
7
8
ICC(HIGH) High-current state
14
16
Supply Current
ICC(HIGH)
ICC(LOW)
/
Ratio of high current to low current (isothermal)
See Figure 7
1.9
1.5
–
–
–
–
ASIL Safety Current
IRESET
3.9
mA
ELECTRICAL PROTECTION CHARACTERISTICS
Supply Zener Clamp Voltage
POWER-ON CHARACTERISTICS
Power-On State
VZsupply
ICC = 19 mA
28
–
–
–
1
V
POS
tPO
V
CC > VCC(min)
ICC(LOW)
–
mA
ms
Time from VCC > VCC(min); time to when device is
ready to give an output transition
Power-On Time [4]
CALIBRATION CHARACTERISTICS
Amount of target rotation (constant direction)
following tPO until first electrical output transition;
see Figure 2
First Output Edge
–
–
–
–
–
–
1.5
3
TCYCLE
edge
Initial Calibration
Number of electrical output transitions
OUTPUT CHARACTERISTICS
Voltage measured at pin 3,
RL = 100 Ω, CL = 10 pF, see Figure 1;
measured between 90% and 10% of the
ICC(HIGH) and ICC(LOW) signal transition
Output Rise Time
Output Fall Time
tr
0
0
2
2
4
4
μs
μs
Voltage measured at pin 3,
RL = 100 Ω, CL = 10 pF, see Figure 1;
measured between 90% and 10% of the
ICC(HIGH) and ICC(LOW) signal transition
tf
Pulse Width, ASIL Warning [5]
Pulse Width, ASIL Critical [5]
tw(ASILwarn) RL = 100 Ω, CL = 10 pF, see Figure 1
tw(ASILcrit) RL = 100 Ω, CL = 10 pF, see Figure 1
63
4
–
–
121
8
μs
ms
Continued on next page...
[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 for Power Derating discussions.
[3] Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.
[4] Output transients prior to tPO should be ignored.
[5] Measured pulse width will vary on load circuit configurations and thresholds. Pulse width measured at threshold of (IRESET + ICC(LOW)) / 2.
4
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
OPERATING CHARACTERISTICS (continued): Valid over operating ranges, unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ. [6]
Max.
Unit
PERFORMANCE CHARACTERISTICS
Air Gap Range
AG
Using Reference Target 60-0, Tested at 2000 rpm [7]
0.5
–
–
3
mm
G
Differential magnitude valid for differential
magnetic channel
Allowable User-Induced Offset
–400
400
Using a single revolution of Reference Target
60-0, wobble < 0.5 mm, (maximum duty cycle –
minimum duty cycle)
Duty Cycle Tolerance
Operating Frequency
ΔD
–
–
10
%
fOP
Sinusoidal magnetic input signal
–
–
–
12
–
kHz
kHz
Over Frequency Warning
fOP(WARN)
Threshold for tw(ASILwarn)
15
[8]
Bounded amplitude ratio within TWINDOW
;
Operating Magnetic Input Signal
Variation
∆BDIFF(pk-pk) no missed output transitions [9]; see Figure 3 and
0.55
3
–
–
–
–
–
Figure 4
Rolling window in which ∆BDIFF(pk-pk) cannot
exceed bounded ratio; see Figure 2, Figure 3,
and Figure 4
Operating Magnetic Input Signal
Window
TWINDOW
TCYCLE
THERMAL CHARACTERISTICS
Minimum-K PCB, single-layer, single-sided, with
copper limited to solder pads
Package Thermal Resistance [10]
RθJA
–
150
–
°C/W
Ferrous Target
Tooth
Valley
TCYCLE
BDIFF
Target Cycle; the amount of rotation that moves one tooth and
valley across the sensor
TCYCLE
=
=
BDIFF
The differential magnetic flux density sensed by the sensor
Figure 2: Definition of TCYCLE
[6] Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits.
[7] Speed-related effects on maximum air gap are highly dependant upon specific target geometry. Consult with Allegro field applications engineering for aid with assess-
ment of target geometries.
[8] Symmetrical signal variation is defined as the largest amplitude ratio from Bn to Bn+TWINDOW. Signal variation may occur continuously while BDIFF remains in the operat-
ing magnetic range.
[9] While (0.5 mm ≤ AG ≤ 3.0 mm) sensor output will never permanently cease to switch with target rotation present.
[10] Additional thermal information is available on the Allegro website.
5
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
Figure 3: Single Period-to-Period Variation
Figure 4: Repeated Period-to-Period Variation
6
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
Reference Target 60-0 (60 Tooth Target)
Characteristics
Outside Diameter
Symbol
Test Conditions
Typ.
Units
Symbol Key
ht
Do
Do
Outside diameter of target
120
mm
F
Breadth of tooth, with respect
to branded face
Face Width
F
t
6
3
3
mm
deg.
deg.
Length of tooth, with respect
to branded face
Branded Face
of Package
Circular Tooth Length
Circular Valley Width
Length of valley, with respect
to branded face
tv
Tooth Whole Depth
Material
ht
3
–
mm
–
Air Gap
Low Carbon Steel
Branded Face
of Sensor
Reference
Target 60-0
Figure 5: 60-0 Reference Target Drawing
7
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
FUNCTIONAL DESCRIPTION
The ATS19420 sensor IC contains a single-chip Hall-effect circuit with the center of the target diameter (Do) and the center of the
that supports one differential channel used to convey accurate
speed and edge position data over a two-wire digital interface.
The sensor is intended for use with ferrous targets. The IC detects
the peaks of the sensed magnetic signals and sets dynamic thresh-
olds based on these detected signals. Output edges are triggered
by BDIFF transitions through the switch points.
tooth breadth (F).
Figure 6 demonstrates how the ferrous target magnetic systems
generate magnetic fields. From generated magnetic fields, the
ATS19420 derives a differential electrical signal using Hall ele-
ments, and converts the analog signal into a digital value using
a full input range analog-to-digital converter. The low noise
Mechanical sensor to target relationship is depicted from Figure 5 analog-to-digital converter allows for accurate peak detection,
for this radial type target. For best signal conduction, it is recom-
mended to align the Hall elements center point, refer to Figure 8,
low gauss operation, and precise position information.
ꢈarget
Pacꢊage ꢁase
ꢅranded ꢋace
Device Orientation to Target
ꢂPin 3
ꢂꢈoꢌ ꢍiew oꢎ
Pacꢊage ꢁaseꢃ
ꢂPin 1
Sideꢃ
ꢀꢁ
Soꢐth Pole
ꢇ1
ꢇꢏ
Sideꢃ
Pole Piece
ꢂꢁoncentratorꢃ
ꢅacꢊ-ꢅiasing
Rare-ꢇarth Pellet
North Pole
A ꢁhannel
Mechanical Position (Target moves past device pin 3 to pin 1)
ꢈhis tooth
ꢈhis tooth
sensed later
sensed earlier
Target Magnetic Profile
ꢉꢅ
ꢁhannel
ꢇlement Pitch
IC Internal Differential Analog Signals, BDIFF
ꢅꢆP
ꢅꢆP
A ꢁhannel
ꢅRP
Detected Channel Switching
A ꢁhannel
Device Output Signal
ꢀ
ꢁꢁꢂHighꢃ
ꢀ
ꢁꢁꢂꢄowꢃ
Figure 6: Magnetic Profile
8
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
Safe State Description
The -A variant contains diagnostic circuitry that will continuously
monitor occurrences of failure defects within the IC. Refer to Fig-
ure 7 for the output protocol of the ASIL Safe State after a fault has
been detected. Error protocol will result from faults which cause
incorrect signal transmission (i.e., too few or too many output
edges).
Note: If a fault exists continuously, the device will attempt recovery
indefinitely. Refer to the ATS19420 Safety Manual for additional
details on the ASIL Safe State Output Protocol.
ꢂerroꢃs ꢀarget
ꢁalley
ꢂaꢃlt
ꢀooth
ꢆꢇꢇꢈHꢆꢉHꢊ
Normal
ꢄꢅeration
ꢆꢇꢇꢈꢋꢄꢌꢊ
ꢆꢇꢇꢈHꢆꢉHꢊ
ꢂaꢃlt
Protocol
ꢆꢇꢇꢈꢋꢄꢌꢊ
ꢆRꢍSꢍꢀ
tPꢄ
twꢈASꢆꢋwarnꢊ or
twꢈASꢆꢋcritꢊ
Figure 7: Output Protocol (ASIL Safe State)
9
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
POWER DERATING
The device must be operated below the maximum junction tem-
perature 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 SN, using
single-layer PCB.
Observe the worst-case ratings for the device, specifically:
RθJA=150°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 a rela-
tively 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 or PD), can
be estimated. The following formulas represent the fundamental
relationships used to estimate TJ, at PD.
P
D(max) = ΔTmax ÷RθJA =15°C÷150°C/W=100mW
Finally, invert equation 1 with respect to voltage:
CC(est) = PD(max) ÷ ICC(max) = 100mW÷16mA=6.25 V
The results indicate 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(avg) = 10.5 mA, and RθJA = 150°C/W, then:
PD = VCC
I
= 12 V 10.5 mA = 126 mW
CC(avg)
×
×
ΔT = PD
R
= 126 mW 150°C/W = 18.9°C
×
×
θJA
TJ = TA + ΔT = 25°C + 18.9°C = 43.9°C
10
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
PACKAGE OUTLINE DRAWING
For Reference Only – Not for Tooling Use
(Reference DWG-0000429, Rev.4)
Dimensions in millimeters – NOT TO SCALE
Dimensions exclusive of mold flash, gate burs, and dambar protrusions
Exact case and lead configuration at supplier discretion within limits shown
7.6ꢀ 0.10
2 × 7°
2 × 10°
B
G
F
F
ꢀ.00 0.10
2.72
C
2.20
1.1ꢀ 0.0ꢀ
Ø2.00 REF
Ejector Pin
Branded
Face
2.89
F
F
F2
F
ꢀ.78 0.10
0.90 REF
0.60 REF
F
F1
B
2
3
1
2.73 REF
0.49 REF
A
0.51 REF
2.ꢀ4 0.10
0.2ꢀ 0.0ꢀ
4ꢀ°
4.03 REF
23.36 REF
1ꢀ.ꢀ8 0.10
19.24 REF
2 × 1.00 0.10
3.03 0.10
ꢀ.80 REF
9.20 REF
4ꢀ°
1.10 REF
1.18 REF
2.00 0.10
0.30 REF
E
4 × Ø1.00 REF
Ejector Pin
0.90 REF
1.60 0.10
7.00 0.10
Notes:
Lot Number
AXXNNNNNX
Date Code
A
B
C
D
E
F
Dambar removal protrusion (12×)
Tie bars (8×)
Active Area Depth, 0.40 0.0ꢀ mm
2
3
1
Branding scale and appearance at supplier discretion
Molded lead bar for preventing damage to leads during shipment
Hall elements (F1 and F2); not to scale
D Standard Branding Reference View
Lines 1, 2, 3, 4: Up to 10 characters, centered
Line 1: Logo A
G
Gate location
Line 2: Characters 5, 6, 7, 8, 9, 10, 11 of
Assembly Lot Number
Line 3: 3 Character Prefix, 5 Digit Part Number,
Package Variant
Line 4: 4 digit Date Code
Figure 8: Package SN, 3-Pin SIP
11
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
High-Accuracy Hall-Effect
Transmission Speed Gear Tooth Sensor IC
ATS19420
Revision History
Number
Date
Description
–
October 31, 2019
Initial release
Copyright 2019, Allegro MicroSystems.
Allegro MicroSystems 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 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
12
Allegro MicroSystems
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
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