ATS699LSNTN-FSWPH-T [ALLEGRO]
Two-Wire, Differential, Vibration-Resistant Sensor IC with Speed and Direction Output;
| 型号： | ATS699LSNTN-FSWPH-T |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | Two-Wire, Differential, Vibration-Resistant Sensor IC with Speed and Direction Output |
| 文件： | 总15页 (文件大小：861K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
ATS699LSN
Two-Wire, Differential, Vibration-Resistant Sensor IC
with Speed and Direction Output
FEATURES AND BENEFITS
DESCRIPTION
• Integrated capacitor reduces requirements for external
EMI-protection components
• Two-wire, pulse-width output protocol
• Highly configurable output protocol options
• Speed and direction information of target
• Vibration tolerance
TheATS699LSN is an optimized Hall-effect integrated circuit
(IC) and rare-earth pellet combination that provides a user-
friendly solution for direction detection and true zero-speed,
digital gear-tooth sensing. The small package can be easily
assembled and used in conjunction with a wide variety of
gear-tooth-sensing applications.
□ Small signal lockout for small amplitude vibration
□ Proprietary vibration detection algorithms for large
amplitude vibration
TheICemployspatentedalgorithmsforthespecialoperational
requirements of automotive transmission applications. The
speed and direction of the target are communicated through a
variablepulse-widthoutputprotocol.TheATS699isparticularly
adept at handling vibration without sacrificing maximum air
gap capability or creating any erroneous “direction” pulses.
Even higher angular vibration caused by engine cranking is
completely rejected by the device. The advanced vibration
detection algorithm will systematically calibrate the sensor IC
on the initial teeth of true target rotation and not on vibration,
always guaranteeing an accurate signal in running mode.
• Air-gap-independent switchpoints
• Undervoltage lockout
• True zero-speed operation
• Wide operating voltage range
• Single chip sensing IC for high reliability
• Robust test-coverage capability with Scan Path and
IDDQ measurement
• Integrated back-biasing magnet
Advanced signal processing and innovative algorithms make
the ATS699 an ideal solution for a wide range of speed and
direction-sensing needs.
PACKAGE: 3-pin SIP (suffix SN)
This device is available in a lead (Pb) free 3-pin SIP package
with tin-plated leadframe.
Not to scale
VCC
REGULATOR
(Analog)
REGULATOR
(Digital)
OFFSET
ADJUST
AGC
FILTER
ADC
Hall Amp
SYNCHRONOUS
DIGITAL CONTROLLER
OUTPUT
CONTROL
OFFSET
ADJUST
AGC
FILTER
ADC
Hall Amp
GND
Functional Block Diagram
ATS699LSN-DS, Rev. 3
MCO-0000148
February 27, 2019
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
SELECTION GUIDE
Part Number
Packing
ATS699LSNTN-FSWPH-T
ATS699LSNTN-RSWPH-T
Tape and reel, 13-in. reel, 800 pieces per reel
Tape and reel, 13-in. reel, 800 pieces per reel
* Not all combinations are available. Contact Allegro sales for availability and pricing of custom programming
options.
Configuration Options
-T
ATS699
L SN TN
Leadframe Plating: Matte tin
Vibration Immunity/Direction Change:
L – Low vibration immunity with immediate direction-change detection or
H – High vibration immunity with non-direction pulses
Calibration Pulses:
B – Blanked, no output during Calibration or
P – Pulses during Calibration
Reverse Pulse Width:
N – 90 µs (narrow) or
W – 180 µs (wide)
Number of Pulses:
S – Single, one pulse per tooth-valley pair or
D – Dual, one pulse per each tooth and each valley
Forward Rotation Direction:
F – Pin 1 to pin 3 target rotation
R – Pin 3 to pin 1 target rotation
Instructions (Packing)
Package Designation
Operating Temperature Range
Allegro Identifier and Device Type
For example: ATS699LSNTN-RSNPL-T
Where a configuration character is unspecified, “x” will be used. For example, -xSNPL applies to both Rotation
Direction configuration variants.
2
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
SPECIFICATIONS
Absolute Maximum Ratings
Characteristic
Symbol
VCC
Notes
Refer to Power Derating section
Rating
28
Units
V
Supply Voltage
Reverse Supply Voltage
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
VRCC
TA
–18
V
Range L
–40 to 150
165
°C
°C
°C
TJ(max)
Tstg
–60 to 170
Pinout Diagram and Terminal List
Terminal List Table
Number
Name
VCC
VCC
GND
Function
1
2
3
Supply voltage
Supply voltage
Ground
1
2
3
Package SN, 3-Pin SIP Pinout Diagram
Internal Discrete Capacitor Ratings
Characteristic
Symbol
Notes
Rating
Units
Nominal Capacitance
CSUPPLY
Connected between VCC and GND
10000
pF
VS
1 VCC
CSUPPLY
ATS699
3 GND
VOUT
RL
CL
Figure 1: Typical Application Circuit
3
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
OPERATING CHARACTERISTICS: valid throughout full operating and temperature ranges; using Reference Target 60-0,
unless otherwise noted.
Characteristics
ELECTRICAL CHARACTERISTICS
Supply Voltage[2]
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
VCC
VCC(UV)
IRCC
Operating, TJ < TJ(max)
4
–
–
3.6
–
24
3.95
–10
–
V
V
Undervoltage Lockout
VCC 0 → 5 V or 5 → 0 V
Reverse Supply Current
Supply Zener Clamp Voltage
VCC = VRCC (MAX)
–
mA[3]
V
VZSUPPLY ICC = ICC(HIGH) + 3 mA, TA = 25°C
28
5
–
ICC(Low)
ICC(High)
Low-current state (Running mode)
High-current state (Running mode)
–
8
mA
mA
mA
Supply Current
12
5
–
16
ICC(SU)(Low) Startup current level and Power-On mode
–
8.5
ICC(High)
/ ICC(Low)
Measured as a ratio of high current to low
current
Supply Current Ratio
OUTPUT STAGE
Output Rise Time
1.9
–
–
–
Δl/Δt from 10% to 90% ICC level; corresponds
to measured output slew rate with CSUPPLY
tr
tr
0
0
2
2
4
4
μs
μs
Δl/Δt from 90% to 10% ICC level; corresponds
to measured output slew rate with CSUPPLY
Output Fall Time
OUTPUT PULSE CHARACTERISTICS[4]
Pulse Width, Forward Rotation
tw(FWD)
38
76
45
90
52
μs
μs
μs
μs
μs
-xxNxx variant
104
207
207
414
Pulse Width, Reverse Rotation
tw(REV)
-xxWxx variant
153
153
306
180
180
360
-xxNPx and -xxNxH variants
-xxWPx and -xxWxH variants
Pulse Width, Non-Direction
tw(ND)
PERFORMANCE CHARACTERISTICS
Operate Point
BOP
BRP
% of peak-to-peak VPROC
% of peak-to-peak VPROC
-xSxxx variant
–
–
0
0
0
0
0
0
0
0
0
0
69
31
–
–
–
%
Release Point
%
12
6
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
kHz
Operating Frequency, Forward
Rotation
fFWD
-xDxxx variant
–
-xSNxx variant
–
7
-xDNxx variant
–
3.5
4
Operating Frequency, Reverse
Rotation
fREV
-xSWxx variant
-xDWxx variant
-xSNxx variant
–
–
2
–
4
-xDNxx variant
–
2
Operating Frequency, Non-Direction
Pulses [5]
fND
-xSWxx variant
-xDWxx variant
–
2.2
1.1
–
Continued on the 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.
Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.
Negative current is defined as conventional current coming out of (sourced from) the specified device terminal.
Load circuit is RL = 100 Ω and CL = 10 pF. Pulse duration measured at threshold of ( (ICC(HIGH) + ICC(LOW)) /2)
Maximum Operating Frequency is determined by satisfactory separation of output pulses: ICC(LOW) of tw(FWD)(MIN). If the customer can resolve shorter low-state
durations, maximum fREV and fND may be increased.
2
3
4
5
4
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
OPERATING CHARACTERISTICS (continued): valid throughout full operating and temperature ranges; using Reference
Target 60-0, unless otherwise noted.
Characteristics
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
DAC CHARACTERISTICS
Magnitude valid for both differential magnetic
channels
Allowable User-Induced Offset
PERFORMANCE CHARACTERISTICS
Operational Magnetic Range
Air Gap Range
–60
–
60
G
Peak to peak differential signal; valid for each
magnetic channel.
BIN
30
–
1200
G
Using Allegro 60-0 reference target
-xxxxL variant
0.5
–
–
–
2.5
–
mm
TTARGET
TTARGET
degrees
degrees
Vibration Immunity (Startup)
ErrVIB(SU) See Figure 2
-xxxxH variant
-xxxxL variant
-xxxxH variant
–
0.12 ×
TTARGET
–
–
–
–
degrees
degrees
Vibration Immunity (Running Mode)
ErrVIB
See Figure 2
TTARGET
360º (degrees prime)
Target
Tooth
Valley
VSP
VPROC(BOP)
TTARGET
TVPROC
(BOP
)
VPROC
VPROC(pk-pk)
(BRP
)
VPROC(BRP)
VPROC = the processed analog signal of the sinusoidal magnetic input (per channel)
TTARGET = the period between successive similar (rising or falling) sensed magnetic edges
VSP
VSP
VSP(sep)
=
VPROC(pk-pk)
Figure 2: Definition of TTARGET
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.
5
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
OPERATING CHARACTERISTICS (continued): valid throughout full operating and temperature ranges; using Reference
Target 60-0, unless otherwise noted.
Characteristics
Symbol
Test Conditions
Min.
Typ. [1]
Max.
Unit
INPUT MAGNETIC CHARACTERISTICS
Allowable Differential Sequential
Signal Variation 1
BSEQ(n+1)
BSEQ(n)
/
/
Signal cycle-to-cycle variation (see Figure 3)
Overall signal variation (see Figure 3)
0.6
0.4
–
–
–
–
–
–
Allowable Differential Sequential
Signal Variation 2
BSEQ(n+1)
BSEQ(n)
CALIBRATION
Amount of target
rotation (constant
BIN > 60 GPP
2 ×
TTARGET
< 3 ×
TTARGET
–
–
degrees
degrees
B
IN ≤ 1200 GPP
direction) following
power-on until first
electrical output pulse
of either tw(FWD) or
tw(REV). See Figure 2.
First Direction Output Pulse[2]
30 GPP ≤ BIN
IN ≤ 60 GPP
2.5 ×
TTARGET
< 4 ×
TTARGET
B
Amount of target
rotation (constant
direction) following
event until first
electrical output pulse
of either tw(FWD) or
tw(REV). VSP(sep) ≥ 35.
See Figure 2..
switch-
point
-xxxxL variant
-xxxxH variant
–
1
–
First Direction-Pulse Output Following
Direction Change
NCD
1 ×
TTARGET
2 ×
TTARGET
< 3 ×
TTARGET
degrees
degrees
Amount of target
rotation (constant
direction) following
event until first
electrical output pulse
of either tw(FWD) or
tw(REV). See Figure 2
1.25 ×
TTARGET
-xxxxL variant
-xxxxH variant
–
–
First Direction-Pulse Output Following
Running Mode Vibration
1 ×
TTARGET
2 ×
TTARGET
< 3 ×
TTARGET
BSEQ(n)
BSEQ(n + 1)
BSEQ(n+1), i ≥ 2
Figure 3: Differential Signal Variation
1
2
Typical values are at TA = 25°C and VCC = 12 V. Performance may vary for individual units, within the specified maximum and minimum limits.
Power-up frequencies ≤ 200 Hz. Higher power-on frequencies may require more input magnetic cycles until output edges are achieved.
6
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
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
Length of tooth, with respect
to branded face
Branded Face
of Package
Circular Tooth Length
Circular Valley Width
degrees
degrees
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
7
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
THERMAL CHARACTERISTICS: May require derating at maximum conditions; see Power Derating section
Characteristic
Symbol
Test Conditions*
Value
Unit
Package Thermal Resistance
RθJA
Single layer PCB, with copper limited to solder pads
150
°C/W
*Additional thermal information available on the Allegro website.
Power Derating Curve
25
24
23
22
21
20
19
18
17
16
15
14
13
VCC(max)
(RθJA = 150°C/W)
12
11
10
9
8
7
6
5
4
VCC(min)
3
2
20
40
60
80 100 120 140 160 180
Temperature (°C)
Power Dissipation versus Ambient Temperature
1000
900
800
700
600
500
400
300
200
100
0
(RθJA = 150°C/W)
20
40
60
80
100 120 140 160 180
Temperature (°C)
8
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
FUNCTIONAL DESCRIPTION
Direction Detection
Sensing Technology
The sensor IC contains a single-chip Hall-effect circuit that sup-
ports a trio of Hall elements. These are used in differential pairs
to provide electrical signals containing information regarding
edge position and direction of target rotation. The ATS699 is
intended for use with ferromagnetic targets.
The sensor IC compares the relative phase of its two differential
channels to determine which direction the target is moving. The
relative switching order is used to determine the direction, which
is communicated through the output protocol.
Data Protocol Description
After proper power is applied to the sensor IC, it is capable of
providing digital information that is representative of the mag-
netic features of a rotating target. The waveform diagrams in
Figure 4 present the automatic translation of the target profiles,
through their induced magnetic profiles, to the digital output
signal of the sensor IC.
When a target passes in front of the device (opposite the branded
face of the package case), the ATS699 generates an output pulse
for each tooth of the target. 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.
FORWARD ROTATION
As shown in panel A in Figure 5, when the target is rotating
such that a tooth near the sensor IC—of -Fxxxx variant—passes
from pin 1 to pin 3, this is referred to as forward rotation. This
direction is opposite for the -Rxxxx variant. Forward rotation is
indicated by output pulse widths of tw(FWD) (45 μs typical).
REVERSE ROTATION
As shown in panel B in Figure 5, when the target is rotating such
that a tooth passes from pin 3 to pin 1, it is referred to as reverse
rotation for the -Fxxxx variant. Reverse rotation is indicated by
output pulse widths of tw(REV) (90 μs typical for -xxNxx variant,
or 180 μs typical for -xxWxx variant).
Pin 3
Pin 1
Panel A
Branded Face
of Package
Rotating Target
(Forward Rotation)
Pin 3
Pin 1
Panel B
Branded Face
of Package
Rotating Target
(Reverse Rotation)
Figure 4: Magnetic Profile
The magnetic profile reflects the features of the target, allowing
the sensor IC to present an accurate digital output(-xSxxx variant
shown).
Figure 5: Target Rotation (F Variant Shown)
9
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
TIMING
Pin 3 to 1 Rotation
Valley
Tooth
Δfwd
tw(FWD)
As shown in Figure 6, the pulse appears at the output slightly
before the sensed magnetic edge traverses the package branded
face. For targets rotating from pin 3 to 1, this shift (Δfwd with R
variants) results in the pulse corresponding to the valley with the
sensed mechanical edge; for targets rotating from pin 1 to 3, the
shift (Δrev) results in the pulse corresponding to the tooth with
the sensed edge. Figure 7 shows pulse timing for F variants. The
sensed mechanical edge that stimulates output pulses is kept the
same for both forward and reverse rotation by using only one
channel to control output switching.
Pin 1 to 3 Rotation
Output Pulse
(Pin 3 to 1 Rotation)
t
Δrev
tw(REV)
Output Pulse
(Pin 1 to 3 Rotation)
Figure 6: Output Protocol (-RSxxx Variant)
Direction Validation
Δrev
For the -xxxxL variant, following a direction change in run-
ning mode, direction changes are immediately transmitted to the
output.
tw(REV)
Output Pulse
(Pin 3 to 1 Rotation)
For the -xxxxH variant, following a direction change in running
mode, output pulses have a width of tw(ND) until direction infor-
mation is validated.
t
Δfwd
tw(FWD)
Output Pulse
(Pin 1 to 3 Rotation)
Figure 7: Output Protocol (-FDxxx Variant)
Target Rotation Forward
Target Rotation Reverse
Valley
Tooth
Target
Differential
Magnetic
Profile
tw(REV)
tw(REV)
tw(FWD)
tw(FWD)
IOUT
t
Figure 8: Running Mode Direction Change (-FSxxL Variant)
Target Rotation Forward
Target Rotation Reverse
Valley
Tooth
Target
Differential
Magnetic
Profile
tw(ND)
tw(REV)
tw(FWD)
tw(FWD)
IOUT
t
Figure 9: Running Mode Direction Change (-FSxxH Variant)
10
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
in the internal A-to-D range to allow for acquisition of signal
peaks. AOA and AGC function separately on the two differential
signal channels.
Start-Up Detection/Calibration
When power is applied to the ATS699, the sensor IC inter-
nally detects the profile of the target. The gain and offset of
the detected signals are adjusted during the calibration period,
normalizing the internal signal amplitude for the air gap range of
the device.
Direction information is available after calibration is complete.
For the –xxxBx variant, the output becomes active at the end of
calibration. Figure 10 shows where the first output edges may
occur for various starting target phases.
The Automatic Gain Control (AGC) feature ensures that opera-
tional characteristics are isolated from the effects of installation
air gap variation.
For the –xxxPx variant, output pulses of tw(ND) are supplied dur-
ing calibration.
Automatic Offset Adjustment (AOA) is circuitry that compen-
sates for the effects of chip, magnet, and installation offsets. This
circuitry works with the AGC during calibration to adjust VPROC
Figure 11 shows where the first output edges may occur for vari-
ous starting target phases.
Target Rotation
Tooth
Valley
Target
Differential
Magnetic
Profile
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
Opposite
Valley
Opposite
Rising Edge
I
CC
Opposite
Tooth
Opposite
t
Falling Edge
Device Location at Power-On
Figure 10: Start-Up Position Effect on First Device Output Switching (-xxxBx Variant)
Target Rotation
Tooth
Valley
Target
Differential
Magnetic
Profile
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(FWD) or
tW(REV)
tW(ND)
tW(ND)
tW(ND)
tW(ND)
Opposite
Valley
tW(ND)
tW(ND)
Opposite
Rising Edge
I
CC
Opposite
Tooth
tW(ND)
tW(ND)
Opposite
t
Falling Edge
Device Location at Power-On
Figure 11: Start-Up Position Effect on First Device Output Switching (-xxxPx Variant)
11
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
Vibration Detection
Algorithms embedded in the IC’s digital controller detect the
presence of target vibration through analysis of the two magnetic
input channels.
ing the proper direction information will resume when direction
information is validated on constant target rotation.
For the –xxxxH variant, in the presence of vibration, output
pulses of tw(ND) may occur or no pulses may occur, depending
on the amplitude and phase of the vibration. Output pulses have
a width of tw(ND) until direction information is validated on con-
For the –xxxxL variant, the first direction change is immediately
transmitted to the output. During any subsequent vibration, the
output is blanked and no output pulses will occur for vibrations
less than the specified vibration immunity. Output pulses contain- stant target rotation.
Normal Target Rotation
Vibration
Normal Target Rotation
Tooth
Valley
Target
Differential
Magnetic
Profile
t
t
t
t
W(FWD)
t
W(FWD)
W(FWD)
W(FWD)
W(REV)
[ or t
]
[ or t
]
[ or t
]
[ or t
]
[ or t
]
W(REV)
W(REV)
W(FWD)
W(REV)
W(REV)
Figure 12: Output Functionality in the Presence of Running Mode Target Vibration (-xxxxL Variant)
Normal Target Rotation Vibration Normal Target Rotation
Tooth
Valley
Target
Differential
Magnetic
Profile
t
t
t
W(FWD)
t
t
W(FWD)
W(FWD)
W(ND)
W(ND)
[ or t
]
W(REV)
[ or t
]
[ or t
]
W(REV)
W(REV)
t
Normal Target Rotation
Vibration
Normal Target Rotation
Tooth
Valley
Target
Differential
Magnetic
Profile
t
W(ND)
t
t
W(FWD)
t
t
t
W(ND)
W(FWD)
W(FWD)
W(ND)
[ or t
]
W(REV)
[ or t
]
[ or t
]
W(REV)
W(REV)
t
Figure 13: Output Functionality in the Presence of Running Mode Target Vibration (-xxxxH Variant)
12
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
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 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 a
single-layer PCB.
Observe the worst-case ratings for the device, specifically:
RθJA =150°C/W, TJ(max) =165°C, and ICC(mean) = 13 mA.
(Note: For variant –xxWPx, at maximum target frequency,
ICC(LOW) = 8 mA, ICC(HIGH) = 16 mA, and maximum pulse
widths, the result is a duty cycle of 84% and thus a worst-case
mean ICC of 14.8 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 Calculate the maximum allowable power level, PD(max). First,
small component of RθJA. Ambient air temperature (TA) and air
motion are significant external factors, damped by overmolding.
invert equation 3:
ΔTmax = TJ(max) – TA = 165°C–150°C = 15°C
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.
This provides the allowable increase to TJ resulting from internal
power dissipation. Then, invert equation 2:
ꢀꢀꢀꢀPD(max) = ΔTmax ÷RθJA =15°C÷150°C/W=100 mW
PD = VIN
I
(1)
(2)
(3)
×
IN
Finally, invert equation 1 with respect to voltage:
ꢀ
ꢀ
ΔT = PD
R
θJA
×
ꢀ VCC(est) = PD(max) ÷ ICC(max)= 100 mW÷14.8 mA= 6.8 V
TJ = TA + ΔT
The result indicates that, at TA, the application and device can
dissipate adequate amounts of heat at voltages ≤VCC(est).
For example, given common conditions such as: TA= 25°C,
VCC = 12 V, ICC = 6 mA, and RθJA = 150°C/W, then:
Compare VCC(est) to VCC(max). If VCC(est) ≤ VCC(max), then
reliable 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 6 mA = 72 mW
CC
×
×
ꢀ
ΔT = PD
R
= 72 mW 150°C/W = 10.8°C
θJA
×
×
TJ = TA + ΔT = 25°C + 10.8°C = 35.8°C
13
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
PACKAGE OUTLINE DRAWING
For Reference Only – Not for Tooling Use
(Reference DWG-9206, Rev.2)
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
ꢀ.00 0.10
2.375
C
Ø2.00 REF
Ejector Pin
1.50
1.50
1.1ꢀ 0.0ꢀ
F2
F3
F
F
2.89
F
F
ꢀ.78 0.10
0.90 REF
0.60 REF
F
F1
Branded
Face
2
3
1
B
2.73 REF
0.49 REF
A
0.51 REF
2.ꢀ4 0.10
0.2ꢀ 0.0ꢀ
4ꢀ°
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
LLLLLLL
NNN[NNNN]
YYWW
Notes:
A
B
C
D
E
F
Dambar removal protrusion (12×)
Tie bars (8×)
2
3
1
Active Area Depth, 0.40 0.0ꢀ mm
D Standard Branding Reference View
Branding scale and appearance at supplier discretion
Molded lead bar for preventing damage to leads during shipment
Hall elements (F1, F2, F3); not to scale
= Supplier emblem
L
= Lot identifier
N
= Last three numbers of device part number
and optional subtype codes
= Last two digits of year of manufacture
= Week of manufacture
Y
W
G
Gate location
Figure 15: Package SN, 3-Pin SIP
14
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Two-Wire, Differential, Vibration-Resistant Sensor
with Speed and Direction Output
ATS699LSN
Revision History
Number
Date
Description
–
1
2
3
March 2, 2017
March 9, 2017
May 19, 2017
Initial release
Updated Thermal Characteristics and Power Derating sections
Updated Selection Guide (page 2, clarified Forward Rotation Direction option).
Minor editorial updates
February 27, 2019
Copyright ©2019, 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
相关型号：
ATS699LSNTN-RSWPH-T
Two-Wire, Differential, Vibration-Resistant Sensor IC with Speed and Direction Output
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