Allegro ATS672LSB-HN Self-calibrating tpo gear-tooth sensor with 9-bit signal capture Datasheet

ATS672LSB
Preliminary – Subject to Change
Self-Calibrating TPO Gear-Tooth Sensor with
9-Bit Signal Capture
PIN OUT DIAGRAM
4321
Pin 1: VCC
Pin 2: VOUT
Pin 3: Test Pin (Tie to GND)
Pin 4: Gnd
ABSOLUTE MAXIMUM RATINGS
Supply Voltage,
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . 28 V
Reverse Supply Voltage,
VR . . . . . . . . . . . . . . . . . . . . . . . . . . . . –18 V
Reverse Current Through Output,
IR . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 mA
Continuous Output Current,
IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . 20 mA
Storage Temperature,
TS . . . . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Package Power Rating,
RθJA. . . . . . . . . . . . . . . . . . . ~150°C/W
Maximum Junction Temperature,
TJmax . . . . . . . . . . . . . . . . . . . . . . . . . 170° C
Maximum Junction Temperature – 100 Hours,
TJmax . . . . . . . . . . . . . . . . . . . . . . . . . 180° C
The ATS672LSB true zero-speed gear-tooth sensors are
optimized Hall IC/magnet configurations packaged in a single inline package (SIP) that provides a user-friendly solution for digital
gear-tooth-sensing applications. The SIP module consists of an
over-molded package, which holds together a samarium cobalt
magnet, a pole piece and a true zero-speed Hall IC that has been
optimized to the magnetic circuit. This small package can be
easily assembled and used in conjunction with gears of various
shapes and sizes.
The sensor incorporates a single-element Hall IC that switches
in response to magnetic signals created by a ferrous target. The
IC contains a sophisticated digital circuit designed to eliminate the
detrimental effects of magnet and system offsets. Signal
processing is used to provide zero-speed performance
independent of air gap and also to dynamically adapt device
performance to the typical operating conditions found in
automotive applications (reduced vibration sensitivity). Highresolution (9-bit) peak-detecting DACs are used to set the adaptive
switching thresholds of the device. Hysteresis in the thresholds
reduces the negative effects of any anomalies in the magnetic
signal (such as magnetic overshoot).
The ATS672LSB also includes a low-bandwidth filter that
increases the noise immunity and the signal-to-noise ratio of the
sensor. These features result in potential improvements in both
the timing accuracy and the jitter performance of the device. The
ATS672LSB sensor system is optimized for cam applications.
Four versions of this device are available. The sensor can be
chosen to have a high or low output signal in response to a “tooth”.
The sensor is also available with and without TPOS (true power on
state) capability. The low-on-tooth sensor without TPOS is
available through general sales. (Part # ATS672LSB-LN). For
other versions please contact the factory. Some restrictions may
apply.
FEATURES
Œ
Œ
Œ
Œ
Œ
Œ
Œ
Œ
Œ
Œ
Œ
Œ
Œ
Tight timing accuracy over temperature
True zero-speed operation
True power-on sensing
Air gap independent switch points
High vibration immunity
Large operating air gaps
Operation down to 3.3 V
Digital output representing target profile
Single-chip solution for high reliability
Small mechanical size
Optimized Hall IC magnetic system
AGC and reference-adjust circuit
Undervoltage lockout
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
OPERATING CHARACTERISTICS Valid at TA = -40°C to +150°C and power supply within specification unless
otherwise noted
Characteristics
Symbol
Limits
Test Conditions
Min.
Typ.
Max.
Units
26.5
V
-18
V
37
V
100
mA
ELECTRICAL CHARACTERISTICS
Supply Voltage
VCC
Operating; TJ < TJmax
Reverse Supply Voltage
VRCC
IRCC = -5 mA (max)
Supply Zener Clamp Voltage
VZ
Supply Zener Current
IZ
Supply Current
ICC
3.3
28
33
Tj < Tjmax; pulsed
Output = off
3.0
6.5
11
mA
Output = on
3.0
6.5
11
mA
Gear Speed < 100 rpm; Vcc> 3.3 V
-
500
µs
-
<VccMin
V
POWER-ON STATE CHARACTERISTICS
Power Up Time
tPO
Under Voltage Lockout
VUV
OUTPUT STAGE
Low Output Voltage
VOUT
IOUT = 15 mA, Output = on
-
0.2
0.45
V
Output Current Limit
Ilin
Output = ON, Tj < Tjmax
25
45
70
mA
IOFF
Output = off, VOUT = Vcc(Max)
-
10
µA
Output Rise Time
tr
RL = 500 Ω, CL = 10 pF, TA = 25°C
-
0.9
5.0
µs
Output Fall Time
tf
RL = 500 Ω, CL = 10 pF, TA = 25°C
-
0.5
5.0
µs
Output Leakage Current
Rise and Fall Time
Output High
90%
90%
100%
10%
10%
tr
tf
Output Low
Time
[Seconds]
Rev. 1.2 May 1, 2002
Page 2 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Characteristics
Symbol
Limits
Test Conditions
Min.
Typ.
Max.
Units
8.0
kHz
SWITCH POINT CHARACTERISTICS
Tooth Speed
Smax
Bandwidth
f-3db
Operate Point
Bop%
Release Point
Brp%
Output Polarity
ATS672LSB-LN (no TPOS)
VOUT
ATS672LSB-LT (with TPOS)*
Output Polarity
ATS672LSB-HN (no TPOS)*
VOUT
ATS672LSB-HT (with TPOS)*
* Restrictions on availability may apply.
0
% of peak to peak referenced to tooth
signal, AG < Agmax;
% of peak to peak referenced to tooth
signal, AG < Agmax;
Over valley
40
kHz
+30
%
+40
%
HIGH
Over tooth
LOW
Over valley
LOW
Over tooth
HIGH
Calibration
Initial Calibration
CI
AGC Disable
Cf
Number of rising mechanical edges for
accurate edge detection
Number of rising mechanical edges
required to complete AGC calibration
3
Edges
3
Edges
Switchpoints
Tooth Signal
Bop%
Brp%
100%
Bop%
Brp%
Valley Signal
Rev. 1.2 May 1, 2002
Page 3 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
OPERATION WITH 8X Reference Target over Operational Air Gap and Temperature with Test Circuit #1 Unless
Otherwise Stated
Limits
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Rising and falling edge, RPM = 1000
3.0
6.0
°
tICRel
during initial calibration
gear eccentricity < 0.1 mm
Rising mechanical edge
1
Relative Timing Accuracy
tRel
after initial calibration, RPM = 1000
0.3
0.6
°
gear eccentricity < 0.1 mm
Falling mechanical edge
tRel
0.5
0.8
°
after initial calibration, RPM = 1000
gear eccentricity < 0.1 mm
Rising mechanical edge
tAbsRise
-0.2
°
air gap: 1.5mm, temperature: 25°C
RPM: 1000
2
Absolute Timing Accuracy
Falling mechanical edge
tAbsFall
+0.6
°
air gap: 1.5mm, temperature: 25°C
RPM: 1000
x 10-5°
After initial calibration
3
6.66
Phase Delay
tRelSpeed
air gap: 1.5 mm, temperature: 25°C
/ RPM
4
Valleys may be detected as teeth:
TPOS Air Gap Min
0.5
mm
AGMin
incorrect TPOS
ATS672LSB – LT and HT
5
TPOS Air Gap Range
ATS672LSB – LT and HT
AGTPOS
Distance for correct TPOS functionality
0.5
-
2.25
mm
TPOS Air Gap Max
ATS672LSB – LT and HT
AGMax
Teeth may be detected as a valley:
incorrect TPOS
2.25
-
5.0
mm
Operational Air Gap Range
AG
Output switching: running mode only
0.5
-
2.25
mm
Edge Repeatability
tθE
360° repeatability, 1000 edges
6
0.04
°
1
Relative Timing Accuracy Range is the change in edge position over the operational air gap and temperature range that
can be expected from a single device. This does not include part-to-part variation.
2
The Typical Absolute Timing Accuracy is the difference between the target mechanical edge (rising or falling) and the
corresponding sensor electrical edge.
3
Phase Delay is the change in edge position over the operational RPM range that can be expected from a single device.
This does not include part-to-part variation or variation due to temperature.
4
The TPOS Air Gap Min is the Installation Air Gap where the device may detect Valleys as Teeth. The True Power On
Function is NOT guaranteed to operate.
5
The TPOS Air Gap Range is the Installation Air Gap Range where the True Power On Function is guaranteed to
operate. Operating is defined as correctly detecting a tooth when powered up over a tooth and correctly detecting a valley
when powered up over a valley using the Reference Target. This specification is only valid for targets that meet or
exceed the ‘Gear Parameters for Correct TPOS Operation’ section of this document.
6
The TPOS Air Gap Max is the Installation Air Gap where the device may detect a Tooth as a Valley. The True Power On
Function is NOT guaranteed to operate.
Rev. 1.2 May 1, 2002
Page 4 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Relative Timing Accuracy
Absolute Timing Accuracy
Target
Target
TAbsRise
TAbsFall
Device Output
TAbsRise (Max - Min)
Device Output
TAbsFall (Max - Min)
TAbsFall (Max - Min)
Operational Air Gap
TPOS Air Gap
Valley
Valley
Tooth
Tooth
TPOS Air Gap
Air Gap
Min
TPOS Air Gap
Range
TPOS Air Gap
Phase Delay [°]
Phase Delay with RPM
0
Rev. 1.2 May 1, 2002
Page 5 of 12
RPM
Max RPM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
Max
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Output Rise Time: R = 500 Ω, C = 10 pF
Rev. 1.2 May 1, 2002
Page 6 of 12
Output Fall Time: R = 500 Ω, C = 10 pF
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Reference Target Dimensions
Target
Reference Target
Diameter
(Do)
120 mm
Thickness
(F)
6.0 mm
Tooth Width
(T)
23.6 mm
Valley Width
(PC – T)
23.6 mm
Valley Depth
(ht)
5.0 mm
Reference Target
Reference Target Dimensions
GEAR PARAMETERS FOR CORRECT TPOS OPERATION
Characteristic
Valley Depth (ht)
Valley Width (PC – T)
Tooth Width (T)
Thickness (F)
1
Description
Depth of target valley
Length and width of target valley
Width of target tooth
Thickness or length of target tooth
Min.
5.0
13
5.0
5.0
Limits
Typ.
Max.
-
Units
mm
mm
mm
mm
MATERIAL PROPERTIES: CRS 1018
1
The target must generate a minimum of 120 gauss difference between the tooth field and the valley field at the Maximum Installation
Air Gap. With the materiel and dimensions mentioned above the target will generate the required 120 gauss.
Rev. 1.2 May 1, 2002
Page 7 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
MECHANICAL INFORMATION
Component
Material
Function
Value
8 mm D x
4 mm L
SmCo – R22
Sensor Package
Material
Thermoset epoxy
Leads
Copper, 0.016” dia, 0.050” spacing
Lead Coating
Solder, tin / lead 90/102
170°C1
Max. temperature
1
Temperature excursions of up to 225°C for 2 minutes or less are permitted.
All industry accepted soldering techniques are acceptable for this sub-assembly as long as the indicated maximum
temperatures for each component are not exceeded.
2
DEVICE QUALIFICATION PROGRAM
Test Name
High Temperature
Operating Life
Test Conditions
AEC-Q100 #2 (JA108)
Ta = 150°C, Tj = 165°C
AEC-Q100 #3 (JA103)
High Temperature Bake
Ta = 170°C
Temperature Humidity AEC-Q100 #5 (JA101)
Bias
85°C/85%RH
Autoclave
AEC-Q100 #6 (JA102)
Temperature Cycling
ESD
Early Life Failure Rate
Thermal Shock
AEC-Q100 #7(JA104)
AEC-Q100 #20 (AEC-Q100002, AEC-Q100-003)
AEC-Q100 #25 (AEC-Q100008)
-40°C to +150°C, 1 minute
transition, 10 minute dwell
Rev. 1.2 May 1, 2002
Page 8 of 12
Test Length # of Lots Sample / lot
408 hrs
3
77
1000 hrs
3
77
1008 hrs
3
77
96 hrs
3
77
500 cycles
3
77
-
1
150°C/24 hrs
3
800
100 cycles
3
77
Comments
-65°C to +160°C, 30 sec.
transition, 30 minute dwell
3/model/step HBM & MM
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Functional Block Diagram
AUTOMATIC GAIN CONTROL
OFFSET
ADJUST
HALL AMP
LPF
TC
ADJUST
Offset
Internal
Regulator
(Analog)
Pin1
VCC
TC
DIFF
TPOS
TPOS
OUTPUT
POR
VREF
TPOS
TRIM
Internal
Regulator
(Digital)
POWER ON
INITIALIZE
9-BIT PDAC
COMP_P
THRESHOLD
COMPARATOR
PDAC
DIFF
AGGRESSIVE
UPDATE
LOGIC
VTHRESH
9-BIT
COUNTER
OUTPUT
STATE
CLK
DIFF
THRESHOLD
OUTPUT
OUTPUT
DRIVER
Pin2
OUTPUT
STATE
THRESHOLD
OUTPUT
NDAC
9-BIT NDAC
COMP_N
AGGRESSIVE
UPDATE
LOGIC
OUTPUT
STATE
9-BIT
COUNTER
CLK
Rev. 1.2 May 1, 2002
Page 9 of 12
1M OSC
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
EMC CAPABILITY
All EMC tests shall be conducted at 23±5°C
Test Name
Inductive transient
Inductive transient
Switching transients
Low voltage drop-out
Load dump transient
Starting transient
Power-off transient
ESD – Human Body
Model (HMB)
ESD – Machine Model
(MM)
Direct RF Injection
Bulk Current Injection
TEM Cell
Reference Specification
Circuit Parameters
ISO 7637-1, Test Level
ISO 7637-1, Test pulse 1
Test circuit #1
ISO 7637-1, Test pulse 2
Test circuit #1
ISO 7637-1, Test pulses 3a & 3b
Test circuit #1
ISO 7637-1, Test pulse 4
Test circuit #1
ISO 7637-1, Test pulse 5
Test circuit #1
ISO 7637-1, Test pulse 6
Test circuit #1
ISO 7637-1, Test pulse 7
Test circuit #1
I
A
-
Performance
II
III
1
C
C
1
C
-
AEC-Q100-002
No additional components
Passes to +/- TBD
AEC-Q100-003
No additional components
Passes to +/- TBD
Test circuit #1
Test circuit #1
Test circuit #1
TBD
TBD
Passes to 200 V/m
ISO 11452-7
ISO 11452-4
ISO 11452-3
Test circuits for electromagnetic compatibility and Typical Operating Schematic
Test circuit 1
RS
100 Ω
Vemc
5V
1
RL
1.2 kΩ
2
0.1
µF
120 pF
GND
1
Vs
4
3 (Must be Grounded)
Additional protection circuitry is required to protect the device from destruction above this voltage level.
Rev. 1.2 May 1, 2002
Page 10 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
IV
C
C
A
A
E
E
C
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
Power Derating Curve: ATS672LSB Package
∆T=PD * RθJA
Where PD=Vcc * Icc
∴ ∆T=Vcc * Icc * RθJA
Maximum Power Dissipation vs. Ambient Temperature
SB Package: Thermal Resistance: 150°C/Watt
1000
900
Maximum Allowable Power
Dissipation [mW]
Power Derating
Due to internal power consumption, the temperature of the
IC (junction temperature, Tj) is higher than the ambient
environment temperature, Ta. To ensure that the device
does not operate above the maximum rated junction
temperature use the following calculations:
800
700
600
500
400
300
200
100
Where ∆T denotes the temperature rise resulting from the
IC’s power dissipation:
TJ = TA + ∆T
RθJA =150°C/W TJ(max) = 170°C
0
20
30
40
50
60
70
80
90
100 110 120 130 140 150 160 170
Ambient Temperature [°C]
Typical TJ Calculation:
TA =25°C, Vcc=5 V, Icc(On)=6.5 mA
PD=Vcc * Icc
PD= 5 V * 6.5 mA = 32.5 mW
∆T=PD* RθJA = 32.5 mW * 150°C/W = 4.9°
TJ = TA + ∆T = 25°C + 4.9°C = 29.9°C
Maximum Allowable Power Dissipation Calculation
TJ = TA + ∆T
TJ (max) = 170°C, if TA=160°C then:
170 = 160 + ∆T
∆T = 10°C
∆T = PD* RθJA (RθJA = 150°C/W)
∴ PD(max) = 10°C / 150°C/W = 66.6 mW @ TA = 160°C
Maximum Vcc for PD(max) =111 mW at TA=160°C
PD=Vcc * Icc Icc = 10 mA (max) at 160°C
Vcc = PD / Icc = 66.6 mW / 10 mA = 6.66 V
Rev. 1.2 May 1, 2002
Page 11 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
ATS672LSB
SELF-CALIBRATING TPOS GEAR-TOOTH SENSOR WITH 9-BIT SIGNAL CAPTURE
Preliminary – Subject to Change
SB PACKAGE DRAWING
Tolerances unless otherwise specified: 1 place ±0.1 mm, 2 places ±0.05 mm
NOTE: Nominal dimensions and tolerances dependent on package material
Rev. 1.2 May 1, 2002
Page 12 of 12
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1993, 1995 Allegro MicroSystems, Inc.
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