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ATS643LSHTN-I2-T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
Self-Calibrating, Zero-Speed Differential
Gear Tooth Sensor IC with Continuous Update
ATS643LSH
3
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS using reference target 60-0, T
A
and V
CC
within specification, unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ. Max. Units
ELECTRICAL CHARACTERISTICS
Supply Voltage V
CC
Operating; T
J
< 165 °C 4.0 – 24 V
Undervoltage Lockout V
CC(UV)
V
CC
0 5 V – 3.5 4.0 V
Supply Zener Clamp Voltage V
Z
I
CC
= 19 mA for ATS643-I1, and 19.8 mA for
ATS643-I2; T
A
= 25°C
28 – – V
Supply Current
I
CC(Low)
ATS643-I1 4.0 6 8.0 mA
ATS643-I2 5.9 7 8.4 mA
I
CC(High)
ATS643-I1 12.0 14.0 16.0 mA
ATS643-I2 11.8 14.0 16.8 mA
Supply Current Ratio
I
CC(High)
/
I
CC(Low)
Ratio of high current to low current 1.85 – 3.05 –
POWER-ON CHARACTERISTICS
Power-On State I
CC(PO)
t < t
on
; dI/dt
< 5 s – High – mA
Power-On Time
1
t
on
Target gear speed < 100 rpm – 1 2 ms
OUTPUT STAGE
Output Slew Rate
2
dI/dt R
LOAD
= 100 , C
LOAD
= 10 pF – 7 – mA/s
Output State V
OUT
R
SENSE
on high side (VCC pin); I
CC
= I
CC(High)
– Low – mV
R
SENSE
on low side (GND pin); I
CC
= I
CC(High)
– High – mV
Continued on the next page.
Self-Calibrating, Zero-Speed Differential
Gear Tooth Sensor IC with Continuous Update
ATS643LSH
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS (continued) using reference target 60-0, T
A
and V
CC
within specification, unless otherwise noted
Characteristic Symbol Test Conditions Min. Typ. Max. Units
SWITCHPOINT CHARACTERISTICS
Rotation Speed S
ROT
Reference Target 60-0 0 – 12,000 rpm
Bandwidth BW Equivalent to f – 3dB 25 40 – kHz
Operate Point B
OP
% of peak to peak referenced from PDAC to NDAC,
AG < AG
MAX
–65– %
Release Point B
RP
% of peak to peak referenced from PDAC to NDAC,
AG < AG
MAX
–35– %
CALIBRATION
3
Initial Calibration Period C
I
Quantity of rising output (current) edges required for
accurate edge detection
– – 3 Edge
AGC Calibration Disable C
f
Quantity of rising output (current) edges used for
calibrating AGC
– – 3 Edge
Start Mode Hysteresis PO
HYS
– 175 – mV
DAC CHARACTERISTICS
Dynamic Offset Cancellation – ±60 – G
Tracking Data Resolution
Quantity of bits available for PDAC/NDAC tracking of
both positive and negative signal peaks
– 9 – Bit
FUNCTIONAL CHARACTERISTICS
Air Gap Range
4
AG DC within specification 0.5 – 2.5 mm
Maximum Operable Air Gap AG
(opmax)
Output switching (no missed edges); DC not
guaranteed
– – 2.75 mm
Duty Cycle Variation DC Wobble < 0.5 mm, AG within specification – – ±10 %
Input Signal Range Sig DC within specification 40 – 1400 G
Minimum Operable Input Signal Sig
(opmin)
Output switching (no missed edges); DC not
guaranteed
30 – – G
1
Power-On Time includes the time required to complete the internal automatic offset adjust. The DACs are then ready for peak acquisition.
2
dI is the difference between 10% of I
CC(Low)
and 90% of I
CC(High)
, and dt is time period between those two points. Note: dI/dt is dependent upon the value
of the bypass capacitor, if one is used.
3
Continuous Update (calibration) functions continuously during Running mode operation.
4
AG is dependent on the available magnetic field. The available field is dependent on target geometry and material, and should be independently
characterized. The field available from the reference target is given in the reference target parameter section of the datasheet.
Self-Calibrating, Zero-Speed Differential
Gear Tooth Sensor IC with Continuous Update
ATS643LSH
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
REFERENCE TARGET, 60-0 (60 Tooth Target)
Characteristics Symbol Test Conditions Typ. Units Symbol Key
Outside Diameter D
o
Outside diameter of target
120 mm
Face Width F
Breadth of tooth, with respect to
branded face
6mm
Circular Tooth Length t
Length of tooth, with respect to
branded face; measured at D
o
3mm
Circular Valley Length t
v
Length of valley, with respect to
branded face; measured at D
o
3mm
Tooth Whole Depth h
t
3mm
Material Low Carbon Steel – –
*Differential B corresponds to the calculated difference in the magnetic fi eld as
sensed simultaneously at the two Hall elements in the device (B
DIFF
= B
E1
– B
E2
).
of Package
Reference Target
60-0
of Package
Branded Face
Reference Gear Magnetic Gradient Amplitude
with Reference to Air Gap
0
200
400
600
800
1000
1200
1400
1600
1800
AG (mm)
Peak-to-Peak Differential B* (G)
0.5 1 1.5 2 2.5
Reference Gear Magnetic Profile
Two Tooth-to-Valley Transitions
-700
-600
-500
-400
-300
-200
-100
0
100
200
300
400
500
600
700
0123456789101112
Gear Rotation (°)
Differential B* (G)
0.50 mm AG
2.00 mm AG
0.50
0.75
1.00
1.25
1.50
1.75
2.00
AG (mm)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

ATS643LSHTN-I2-T

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MAGNET SW SPEC PURP 4PIN MODULE
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