A19520LUBBTN-RSNHPOKG-A [ALLEGRO]
Vibration-Tolerant Hall-Effect Transmission Speed and Direction Sensor IC;型号: | A19520LUBBTN-RSNHPOKG-A |
厂家: | ALLEGRO MICROSYSTEMS |
描述: | Vibration-Tolerant Hall-Effect Transmission Speed and Direction Sensor IC |
文件: | 总15页 (文件大小:883K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
A19520
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
FEATURES AND BENEFITS
DESCRIPTION
• Differential Hall-effect sensor measures ring magnets
and ferrous targets with inherent stray field immunity
• SolidSpeed Digital Architecture™ provides robust,
adaptive performance with advanced algorithms that
provide vibration immunity over the full target pitch
• Integrated solution includes a capacitor in a single
overmolded miniature package
• ISO 26262:2011 ASIL B with integrated diagnostics and
certified safety design process
• Two-wire current source output pulse-width protocol
supporting speed, direction, and ASIL error reporting
• EEPROM enables factory traceability
The A19520 is an advanced vibration-tolerant Hall-effect
integrated circuit (IC) that measures the speed and direction
of rotating targets. This sensor IC can directly measure ring
magnets or be back-biased with a magnet to measure ferrous
targets. The package features an integrated capacitor for
electromagnetic compatibility (EMC).
The A19520 employs intelligent algorithms that allow stable
operation during vibration and highly dynamic air gap
environmentscommontotransmissionapplications.Inaddition,
the A19520 differential sensing offers inherent rejection of
interfering common-mode magnetic fields.
TheIChasbeendesignedtoacertifiedISO26262:2011design
processtoalloweasyintegrationintohighsafetylevelsystems.
Integrated diagnostics are used to detect an IC failure that
impacts the output protocol’s accuracy, providing coverage
compatible with ASIL B compliance.
2
-
PACKAGE:
2-Pin SIP
(suffix UB)
The A19520 is provided in a 2-pin miniature SIP package
(suffix UB) that is lead (Pb) free, with tin leadframe plating.
The UB package includes an IC and capacitor integrated into
a single overmolded package, with an additional molded
lead-stabilizing bar for robust shipping and ease of assembly.
Not to scale
VCC
+
ADC
Output
-
Digital
Controller
Current
ESD
Generator
Analog-to-Digital
Front End
and
Amplification
Signal Conditioning
+
ADC
-
GND
Regulator
EEPROM
Diagnostics
+
Oscillator
-
Functional Block Diagram
A19520-DS
December 17, 2018
MCO-0000530
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
SELECTION GUIDE*
Part Number
Packing
A19520LUBBTN-FSNHPYUE-A
A19520LUBBTN-RSNHPYUE-A
A19520LUBBTN-FSNHPYUE
A19520LUBBTN-RSNHPYUE
Tape and reel, 4000 pieces per reel
Tape and reel, 4000 pieces per reel
Tape and reel, 4000 pieces per reel
Tape and reel, 4000 pieces per reel
* Not all combinations are available. Contact Allegro sales for availability and pricing of custom
programming options.
Configuration Options
A19520
L
UBB
TN-
ASIL Protocol:
-A ASIL protocol enabled
[blank] – ASIL protocol disabled
Magnetic Temperature Compensation:
E
0.16%/°C
G – 0.04%/°C
Extended Sudden Air Gap:
K – Timed resets enabled
U – Feature not enabled
Calibration Mode Non-Direction Pulses:
O – Blanked, no output during Calibration
Y – Pulses allowed during Calibration
Running Mode Non-Direction Pulses:
B – Blanked, no output during Running mode
P – Pulses allowed during Running mode
Vibration Immunity / Direction Change:
L – Low vibration immunity with immediate direction change detection
H – High vibration immunity
Pulse Widths (Typical):
I – Intermediate, Forward = 60 µs, Reverse = 120 µs, Non-Direction = 30 µs
N – Narrow, Forward = 45 µs, Reverse = 90 µs, Non-Direction = 180 µs
W –Wide, Forward = 45 µs, Reverse = 180 µs, Non-Direction = 360 µs
Number of Pulses:
S – Single, one pulse per magnetic pole pair
Rotation Direction:
F – Forward, pin 1 to pin 2
R – Forward, pin 2 to pin 1
Packing Instructions
Package Designation
Operating Temperature Range
Allegro Identifier and Device Type
2
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
VCC
Notes
Rating
28
Unit
V
Supply Voltage
Refer to Power Derating section
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
INTERNAL DISCRETE CAPACITOR RATINGS
Characteristic
Symbol
Test Conditions
Value (Typ.)
Unit
Nominal Capacitance
CSUPPLY
Connected between pin 1 and pin 2 (refer to Figure 1)
10
nF
PINOUT DIAGRAM AND TERMINAL LIST
VSUPPLY
1
1
2
A19520
IC
2
UB Package, 2-Pin SIP Pinout Diagram
CL
RL
Terminal List Table
GND
Name
Number
Function
VCC
1
2
Supply Voltage
Ground
Figure 1: Typical Application Circuit
GND
3
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
OPERATING CHARACTERISTICS: Valid throughout full operating and temperature ranges, unless otherwise specified
Characteristic
GENERAL
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
Operating, TJ < TJ(max), voltage across pin 1 and
pin 2; does not include voltage across RL
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)
Refer to Figure 15
1.9
1.5
–
–
–
–
ASIL Safety Current
IRESET
3.9
mA
PROTECTION CIRCUITS
Supply Zener Clamp Voltage
POWER-ON CHARACTERISTICS
Power-On State
VZsupply
ICC = 19 mA, TA = 25°C
28
–
–
–
1
V
POS
tPO
V
CC > VCC(min), as connected in Figure 1
ICC(LOW)
–
mA
ms
Time from VCC > VCC(min), until device has
entered calibration
Power-On Time [4]
OUTPUT PULSE CHARACTERISTICS, PULSE PROTOCOL [5]
Voltage measured at pin 2 in Figure 1,
Output Rise Time
Output Fall Time
tr
tr
RL = 100 Ω, CL = 10 pF, measured between
10% and 90% of signal
0
0
2
2
4
4
μs
μs
Voltage measured at pin 2 in Figure 1,
RL = 100 Ω, CL = 10 pF, measured between
10% and 90% of signal
Pulse Width, ASIL Warning
Pulse Width, ASIL Critical
tw(ASILwarn) Refer to Figure 15
tw(ASILcrit) Refer to Figure 15
63
4
–
–
121
8
μs
ms
Continued on next page...
4
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
OPERATING CHARACTERISTICS (continued): Valid throughout full operating temperature ranges,
unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
INTERMEDIATE PULSE WIDTH OPTION (PART NUMBER -xxIxxxxx)
Threshold to Enter High-Speed Mode
Threshold to Exit High-Speed Mode
Pulse Width, Forward Rotation
Pulse Width, Reverse Rotation
Pulse Width, High-Speed
fHIGH
fLOW
TCYCLE frequency increasing
TCYCLE frequency decreasing
TCYCLE frequency < fLOW
TCYCLE frequency < fLOW
TCYCLE frequency > fHIGH
0.935
0.850
51
1.1
1
1.265
1.150
69
kHz
kHz
μs
tw(FWD)
tw(REV)
tw(HS)
tw(ND)
60
120
30
30
102
25
138
35
μs
μs
Pulse Width, Non-Direction
25
35
μs
Operating Frequency,
Forward Rotation [6][7][8]
fFWD
fREV
fND
0
0
0
̶
̶
̶
12
12
12
kHz
kHz
kHz
Operating Frequency,
[6][7][8]
Reverse Rotation
Operating Frequency,
Non-Direction Pulses [6][8]
NARROW PULSE WIDTH OPTION (PART NUMBER -xxNxxxxx)
Pulse Width, Forward Rotation
Pulse Width, Reverse Rotation
Pulse Width, Non-Direction
tw(FWD)
tw(REV)
tw(ND)
38
76
45
90
52
μs
μs
μs
104
207
153
180
Operating Frequency,
Forward Rotation [6][8]
fFWD
fREV
fND
0
0
0
̶
̶
̶
12
7
kHz
kHz
kHz
Operating Frequency,
Reverse Rotation [6][8]
Operating Frequency,
Non-Direction Pulses [6][8]
4
WIDE PULSE WIDTH OPTION (PART NUMBER -xxWxxxxx)
Pulse Width, Forward Rotation
Pulse Width, Reverse Rotation
Pulse Width, Non-Direction
tw(FWD)
tw(REV)
tw(ND)
38
45
52
μs
μs
μs
153
306
180
360
207
414
Operating Frequency,
Forward Rotation [6][8]
fFWD
fREV
fND
0
0
0
̶
̶
̶
12
4
kHz
kHz
kHz
Operating Frequency,
Reverse Rotation [6][8]
Operating Frequency,
Non-Direction Pulses [6][8]
2.2
[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] Timing from start of rising output transition. Measured pulse width will vary on load circuit configurations and thresholds. Pulse width measured at threshold of (ICC(HIGH)
+ ICC(LOW)) / 2 for non-ASIL pulses and (IRESET + ICC(LOW)) / 2 for ASIL pulses.
[6] Maximum Operating Frequency is determined by satisfactory separation of output pulses. If shorter low-state durations can be resolved, the maximum fREV and fND may
be higher, excluding the -xxIxxxx variant or f(FWD) as filter bandwidth limitation applies.
[7] Direction information is not available when frequency > fHIGH for the Intermediate Pulse Width option.
[8] Zero-speed is not met when the K-variant is implemented due to the inclusion of a timed reset.
5
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
OPERATING CHARACTERISTICS (continued): Valid throughout full operating temperature ranges,
unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
INPUT CHARACTERISTICS AND PERFORMANCE
Operating Differential
BDIFF(pk-pk) Peak-to-peak of differential magnetic input
30
–750
0.7
–
–
–
–
–
750
1.3
–
G
G
–
Magnetic Input [8]
Operating Differential
Magnetic Range [8]
BDIFF
Differential input signal; refer to Figure 5
BSEQ(n+1)
BSEQ(n)
/
Signal cycle-to-cycle variation
(refer to Figure 2)
Allowable Differential Sequential
Signal Variation
BSEQ(n+i)
BSEQ(n)
/
Overall signal variation
(refer to Figure 2)
0.1
–
Operate Point
Release Point
BOP
BRP
% of peak-to-peak IC-processed signal
% of peak-to-peak IC-processed signal
Required amount of amplitude separation
–
–
70
30
–
–
%
%
Switch Point Separation
BDIFF(SP-SEP) between channels at each BOP and BRP
occurrence; refer to Figure 4
20
–
–
–
–
%BDIFF(pk-pk)
Periods after tPO completed and first valid speed
4 ×
TCYCLE
Initial Calibration
TCAL
and direction output. Constant direction of rotation.
Refer to Figure 3 for definition of tCYCLE
–
.
High Vibration (-xxxHxxxx variant)
Low Vibration (-xxxLxxxx variant)
High Vibration (-xxxHxxxx variant)
1 × TCYCLE
1 × TCYCLE
1 × TCYCLE
–
–
–
–
–
–
–
–
–
Vibration Immunity (Startup)
Vibration Immunity (Running Mode)
0.12 ×
TCYCLE
Low Vibration (-xxxLxxxx variant)
–
–
–
THERMAL CHARACTERISTICS
Based on magnetic material makeup
(-xxxxxxxE variant)
–
–
–
0.16
0.04
213
–
–
–
%/°C
%/°C
°C/W
Magnetic Temperature Coefficient [9]
Package Thermal Resistance [10]
TC
Based on magnetic material makeup
(-xxxxxxxG variant)
Single-layer PCB with copper limited to solder
pads
RθJA
[8] Differential magnetic field is measured for Channel A (E1-E2) and Channel B (E2-E3) independently. Refer to Figure 5. Each channel’s differential magnetic field is measured
between two Hall elements with spacing determined by Figure 16. Magnetic field is measured orthogonally to the front of the package.
[9] Magnets and magnetic encoders decrease in magnetic strength with rising temperature. The device temperature coefficient compensates, to help maintain a consistent air
gap over temperature.
[10] Additional thermal information is available on the Allegro website.
6
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
B SEQ(n)
Target
S
N
S
N
B SEQ(n + 1)
B SEQ(n+i) , i ≥ 2
TCYCLE
BDIFF
BDIFF = Differential Input Signal; the differential magnetic
flux sensed by the sensor
TCYCLE = Target Cycle; the amount of rotation that
moves one north pole and one south pole
across the sensor
Figure 2: Differential Signal Variation
Figure 3: Definition of TCYCLE
ꢄꢅꢆꢇꢇ
ꢁꢂꢃꢄꢄꢅmaꢆꢇ
S
N
S
N
TCYCLE
Aꢈꢈlied ꢁꢂꢃꢄꢄ
ꢁꢂꢃꢄꢄꢅꢈꢉ-ꢈꢉꢇ
0 ꢀ
BDIFF(SP)
BDIFF(BOP)
(BOP
)
Channel B
BDIFF(pk-pk)
(BRP
)
BDIFF(BRP)
BDIFF(SP)
Channel A
ꢁꢂꢃꢄꢄꢅminꢇ
BDIFF(SP)
BDIFF(SP-SEP)
=
ꢀꢁꢂꢃ
BDIFF(pk-pk)
Figure 5: Differential Magnetic Input
Figure 4: Definition of Switch Point Separation
7
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
FUNCTIONAL DESCRIPTION
The A19520 sensor IC contains a single-chip Hall-effect circuit
that supports three Hall elements. These elements are used in
differential pairs to provide electrical signals containing informa-
tion regarding speed, direction of target rotation, and edge posi-
tion. The A19520 is intended for use with ring magnet targets,
or, when back-biased with an appropriate magnet, with ferrous
targets. The IC detects the peaks of the magnetic signals and sets
dynamic thresholds based on these detected signals. Output edges
are triggered by BDIFF transitions through the switch points.
General Protocol Description
When a target passes in front of the device (opposite the branded
face of the package case), the sensor IC generates an output pulse
for each magnetic pole-pair of the target or for each tooth-valley
pair. Speed information is provided by the output pulse rate,
while direction of target rotation is provided by the duration of
the output pulses. The sensor IC can sense target movement in
both the forward and reverse directions.
For the “-xxIxxxxx” variant, when in High Speed Mode, output
pulses will be of tw(HS) duration for either target direction of rota-
tion.
ROTATION DIRECTION
When the target is rotating such that a target feature passes from
pin 1 to pin 2, this is referred to as forward rotation. This direc-
tion of rotation is indicated on the IC output by a tw(FWD) pulse
width. For the “-Rxxxxxxx” variant, forward direction is indi-
cated for target rotation from pin 2 to 1.
Refer to Figure 6 for target orientation to the device and Figure 7
through Figure 9 for a general output protocol understanding.
Target Rota�on (Forward)
S
N
S
N
S
ICC(HIGH)
tw(FWD)
tw(FWD)
ICC(LOW)
Figure 7: Output Protocol (-Fxxxxxxx),
No High Speed Mode, Forward Rotation
Target Rota�on (Reverse)
S
N
S
N
S
ꢅranded ꢂace
oꢆ Sensor
Rotating ꢈarget
ICC(HIGH)
N
S
S
N
tw(REV)
tw(REV)
N
S
S
N
S
N
Pin 1
Pin ꢇ
ICC(LOW)
Figure 8: Output Protocol (-Fxxxxxxx),
No High Speed Mode, Reverse Rotation
ꢀAꢁ ꢂorward Rotation ꢀ-ꢂꢃꢃꢃꢃꢃꢃꢃ ꢄariantꢁ
Target Rota�on (Forward)
or
ꢅranded ꢂace
oꢆ Sensor
Rotating ꢈarget
Target Rota�on (Reverse)
S
N
S
N
S
N
S
S
N
N
S
S
N
S
N
Pin 1
ICC(HIGH)
Pin ꢇ
ꢀꢅꢁ Reꢄerse Rotation ꢀ-ꢂꢃꢃꢃꢃꢃꢃꢃ ꢄariantꢁ
tw(HS)
tw(HS)
Figure 6: Target Orientation Relative to Device
(ring magnet shown).
ICC(LOW)
Figure 9: Output Protocol (-xxIxxxxx),
High Speed Mode
8
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
ꢈarget
Pacꢆage Case
ꢃranded ꢇace
Pacꢇage Case ꢀranded ꢈace
Device Orientation to Target
Device Orientation to Target
ꢁPin 1
Sideꢂ
ꢁꢈoꢉ ꢊiew oꢋ
Pacꢆage Caseꢂ
ꢁPin ꢅ
Sideꢂ
ꢀC
ꢌ3
ꢌ1
ꢆ3
ꢆꢅ
ꢆ1
ꢌꢅ
Pole Piece
ꢂC
ꢃPin ꢅ Sideꢄ
ꢃꢋoꢌ ꢍiew oꢎ
ꢃPin 1 Sideꢄ
ꢁConcentratorꢂ
ꢃacꢆ-ꢃiasing
Rare-ꢌarth Pellet
ꢃ Channel
North Pole
ꢀ Channel
ꢆlement Pitch
A Channel
ꢆlement Pitch
Soꢍth Pole
A Channel
Pacꢇage Caseꢄ
Mechanical Position (Target moves past device pin 1 to pin 2)
Mechanical Position (Target moves past device pin 1 to pin 2)
ꢋarget
ꢋhis ꢌole
ꢋhis ꢌole
ꢃRadial Ring Magnetꢄ
sensed later
sensed earlier
ꢈhis tooth
ꢈhis tooth
sensed later
sensed earlier
ꢁ
ꢀ
ꢁ
Target Magnetic Profile
Channel
ꢆlement Pitch
Target Magnetic Profile
ꢎꢃ
Channel
ꢌlement Pitch
ꢉꢀ
ꢊꢀ
IC Internal Differential Analog Signals, VPROC
ꢀꢁP ꢀꢁP
IC Internal Differential Analog Signals, VPROC
ꢃꢄP
A Channel
A Channel
ꢃRP
ꢃRP
ꢀRP
ꢃꢄP
ꢀꢁP
ꢀ Channel
ꢃ Channel
ꢃRP
ꢀRP
Detected Channel Switching
Detected Channel Switching
A Channel
A Channel
ꢃ Channel
ꢀ Channel
Device Output Signal
Device Output Signal
CCꢃHighꢄ
ꢀCCꢁHighꢂ
ꢂ
ꢂ
ꢀCCꢁLowꢂ
CCꢃLowꢄ
Figure 10: Basic Operation
9
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
Startup Detection/Calibration
Direction information is available after calibration is complete.
After proper supply voltage is applied to the IC, the IC detects the
magnetic profile of the rotating target.
Figure 11 and Figure 12 show where the first output edges may
occur for various starting target phases.
The calibration period occurs on the first few features of the
target that pass in front of the IC.
ꢁarget Rotation
ꢀ
ꢁ
ꢀ
ꢁ
ꢀ
ꢁ
ꢀ
ꢁ
ꢀ
ꢁarget
ꢂiꢃꢃerential
Magnetic
Proꢃile
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
ꢄꢅꢅosite
north ꢅole
ꢄꢅꢅosite
N→S boundary
ꢀ
CC
ꢄꢅꢅosite
south pole
ꢄꢅꢅosite
t
S→N boundary
ꢂeꢆice Location at Power-ꢄn
Figure 11: Startup Position Effect on First Device Output Switching (-xxxxxOxx variant)
ꢁarget Rotation
ꢀ
ꢁ
ꢀ
ꢁ
ꢀ
ꢁ
ꢀ
ꢁ
ꢀ
ꢁarget
ꢂiꢃꢃerential
Magnetic
Proꢃile
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈꢉꢇꢂꢊ or
tꢇꢈRꢋꢌꢊ
tꢇꢈNꢂꢊ
tꢇꢈNꢂꢊ
tꢇꢈNꢂꢊ
tꢇꢈNꢂꢊ
ꢄꢅꢅosite
north ꢅole
tꢇꢈNꢂꢊ
tꢇꢈNꢂꢊ
ꢄꢅꢅosite
N→S boundary
ꢀ
CC
ꢄꢅꢅosite
south pole
tꢇꢈNꢂꢊ
tꢇꢈNꢂꢊ
ꢄꢅꢅosite
t
S→N boundary
ꢂeꢆice Location at Power-ꢄn
Figure 12: Startup Position Effect on First Device Output Switching (-xxxxxYxx variant)
10
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
Vibration Detection
than the specified vibration immunity. Output pulses containing the
Algorithms embedded in the IC’s digital controller detect the pres-
ence of target vibration (oscillation) through analysis of the two
magnetic input channels.
proper direction information will resume when direction informa-
tion is validated on constant target rotation.
With High vibration mode, advanced algorithm detection provides
additional immunity. As shown in Figure 14, the IC may produce
tND pulses, depending on the vibration amplitude.
With low vibration option, during any detected vibration, the out-
put is blanked and no output pulses will occur for vibrations less
Normal ꢀarget Rotation
Normal ꢀarget Rotation
ꢁiꢂration
N
S
N
S
S
N
S
N
ꢀarget
ꢃiꢄꢄerential
Magnetic
Profile
tꢆꢇꢈꢆꢃꢉ
ꢅor tꢆꢇRꢊꢁꢉꢋ
tꢆꢇꢈꢆꢃꢉ
ꢅor tꢆꢇRꢊꢁꢉꢋ
tꢆꢇRꢊꢁꢉ
ꢅor tꢆꢇꢈꢆꢃꢉꢋ
tꢆꢇꢈꢆꢃꢉ
ꢅor tꢆꢇRꢊꢁꢉꢋ
tꢆꢇꢈꢆꢃꢉ
ꢅor tꢆꢇRꢊꢁꢉꢋ
t
Figure 13: Output Functionality in the Presence of
Running Mode Target Vibration – Low Vibration Immunity (-xxxLBxxx variant)
Normal ꢀarget Rotation
Normal ꢀarget Rotation
ꢁiꢂration
S
N
S
N
S
N
S
N
ꢀarget
ꢃiꢄꢄerential
Magnetic
Profile
tꢆꢇꢈꢆꢃꢉ
tꢆꢇꢈꢆꢃꢉ
tꢆꢇꢈꢆꢃꢉ
tꢆꢇNꢃꢉ
tꢆꢇNꢃꢉ
ꢅor tꢆꢇRꢊꢁꢉꢋ
ꢅor tꢆꢇRꢊꢁꢉꢋ
ꢅor tꢆꢇRꢊꢁꢉꢋ
-ꢌꢌꢌHPꢌꢌꢌ
ꢁariant
tꢆꢇNꢃꢉ
tꢆꢇNꢃꢉ
tꢆꢇNꢃꢉ
tꢆꢇꢈꢆꢃꢉ
tꢆꢇꢈꢆꢃꢉ
tꢆꢇꢈꢆꢃꢉ
ꢅor tꢆꢇRꢊꢁꢉꢋ
ꢅor tꢆꢇRꢊꢁꢉꢋ
ꢅor tꢆꢇRꢊꢁꢉꢋ
t
-ꢌꢌꢌHꢍꢌꢌꢌ
ꢁariant
tꢆꢇꢈꢆꢃꢉ
tꢆꢇꢈꢆꢃꢉ
tꢆꢇꢈꢆꢃꢉ
ꢅor tꢆꢇRꢊꢁꢉꢋ
ꢅor tꢆꢇRꢊꢁꢉꢋ
ꢅor tꢆꢇRꢊꢁꢉꢋ
t
Figure 14: Output Functionality in the Presence of
Running Mode Target Vibration – High Vibration Immunity (-xxxHxxxx variant)
11
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
ASIL Protocol
The A19520 sensor IC contains diagnostic circuitry that will
continuously monitor occurrences of failure defects within the IC.
Refer to Figure 15 for the output protocol of the ASIL Safe State
after an internal defect has been detected. Error Protocol will result
from faults which cause incorrect signal transmission (i.e., too few
or too many output pulses).
Note: If a fault exists continuously, the device will attempt recov-
ery indefinitely. Refer to the A19520 Safety Manual for additional
details on the ASIL Safe State Output Protocol.
Ring Magnet
S
S
N
S
N
S
N
S
N
S
N
ꢂCCꢃHꢂꢄHꢅ
ꢂCCꢃLꢀꢆꢅ
Normal
ꢀꢁeration
ꢇaꢈlt
ꢂCCꢃHꢂꢄHꢅ
ꢇaꢈlt
Protocol
ꢂCCꢃLꢀꢆꢅ
ꢂRꢉSꢉꢊ
twꢃASꢂLwarnꢅ
or
tPꢀ
twꢃASꢂLcritꢅ
Figure 15: Output Protocol (ASIL Safe State)
12
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
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 UB, using
1-layer PCB.
Observe the worst-case ratings for the device, specifically:
RθJA=213°C/W, TJ(max) =165°C, VCC(max)= 24 V, and
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.
ICC(AVG) = 14.6 mA. ICC(AVG) is computed using ICC(HIGH)(max)
and ICC(LOW)(max), with a duty cycle of 83% computed from
tw(REV)(max) on-time at 4 kHz maximum operating frequency.
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÷213°C/W=70.4mW
Finally, invert equation 1 with respect to voltage:
CC(est) = PD(max) ÷ ICC(AVG) = 70.4mW÷14.6mA=4.8 V
PD = VIN
I
(1)
(2)
(3)
×
IN
ꢀ
ꢀ
ΔT = PD
R
×
θJA
V
TJ = TA + ΔT
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat above 6.5 V at 150°C.
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 14 mA, and RθJA = 213°C/W, then:
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.
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
Power Dissipation versus Ambient Temperature
Power Derating Curve
26
1400
1200
1000
24
22
20
18
16
14
12
10
8
VCC(max)
800
1-layer PCB, Package UB
(RθJA = 213°C/W)
600
1-layer PCB, Package UB
(RθJA = 213°C/W)
400
200
0
6
4
VCC(min)
80 100 120 140 160 180
2
20
40
60
20
40
60
80
100 120 140 160 180
Temperature (°C)
Temperature (°C)
13
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
PACKAGE OUTLINE DRAWING
For Reference Only – Not for Tooling Use
(Reference DWG-0000408, Rev. 3)
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
+0.06
4.00
–0.05
B
4×ꢀ0°
E 1.50
1.50 0.05
1.50 E
0.50 E
C
1.39
E
Mold Ejector
Pin Indent
+0.06
4.00
–0.07
E
E1
E3
E2
E
E
45°
Branded
Face
19550
Date Code
Lot Number
A
0.85 0.05
0.42 0.05
4 × 2.50 0.ꢀ0
0.25 REF
0.30 REF
2.54 REF
D
Standard Branding Reference View
Lines 1, 2, 3 = Max 5 characters per line
Line 1: 5-digit Part Number
Line 2: 4-digit Date Code
Line 3: Characters 5, 6, 7, 8 of Asembly
Lot Number
ꢀ
2
18.00 0.10
ꢀ2.20 0.ꢀ0
ꢀ.00 0.05
+0.07
0.25
4 × 7.37 REF
ꢀ.80 0.ꢀ0
–0.03
A
B
C
D
E
F
Dambar removal protrusion (8×)
Gate and tie burr area
Active Area Depth, 0.38 mm 0.03
0.38 REF
0.25 REF
Branding scale and appearance at supplier discretion
Hall elements (E1, E2, and E3); not to scale
Molded Lead Bar for preventing damage to leads during shipment
4 × 0.85 REF
0.85 0.05
+0.06
ꢀ.80
–0.07
F
+0.06
4.00
ꢀ.50 0.05
–0.05
Figure 16: Package UB, 2-Pin SIP
14
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Vibration-Tolerant Hall-Effect
Transmission Speed and Direction Sensor IC
A19520
Revision History
Number
Date
Description
–
December 17, 2018
Initial release
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
15
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
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