ATS642 Allegro MicroSystems, Inc., ATS642 Datasheet - Page 4

• Manufacturer Part Number: ATS642
• Description: Two-wire True Zero Speed Miniature Differential Peak-detecting Gear Tooth Sensor With Continuous Calibration
• Manufacturer: Allegro MicroSystems, Inc.

ATS642LSH-DS
OPERATING CHARACTERISTICS (continued) using reference target 60-0, T
SWITCHPOINT CHARACTERISTICS
Rotation Speed
Analog Signal Bandwidth
Operate Point
Release Point
CALIBRATION
Initial Calibration
DAC CHARACTERISTICS
Allowable User-Induced Differential
Offset
FUNCTIONAL CHARACTERISTICS
Operational Air Gap Range
Maximum Operational Air Gap
Range
Duty Cycle Variation
Duty Cycle Pitch Variance
Operating Signal Range
Minimum Operating Signal
1
2
3
4
5
Note: di/dt is dependent upon the value of the bypass capacitor, if one is used.
6
7
characterized. The fi eld available from the reference target is given in the reference target parameter section of the datasheet.
8
9
effect of target wobble.
Typical values are at T
Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.
Please refer to Sensor Operation section, page 13.
Power-On Time includes the time required to complete the internal automatic offset adjust. The DACs are then ready for peak acquisition.
dI is the difference between 10% of I
Functional characteristics valid only if magnetic offset is within the specifi ed range for Allowable User Induced Differential Offset.
AG is dependent on the available magnetic fi eld. The available fi eld is dependent on target geometry and material, and should be independently
E
In order to remain in specifi cation, the magnetic gradient must induce an operating signal greater than the minimum value specifi ed. This includes the
DC
represents the difference between consecutive duty cycles, DC(n) - DC(n-1); Mean ± 3-sigma.
True Zero Speed Miniature Differential Peak-Detecting Gear Tooth Sensor
Characteristic
A
= 25°C and V
9
8
7
CC(Low)
CC
AG
6
Sig
= 12 V. Performance may vary for individual units, within the specifi ed maximum and minimum limits.
Symbol
S
ΔDC
B
B
E
BW
OP(max)
and 90% of I
AG
Sig
OP(min)
ROT
C
OP
RP
DC
I
Reference Target 60-0
Equivalent to f – 3 dB
Transitioning from I
referenced; AG < AG
Transitioning from I
referenced; AG < AG
Quantity of rising output (current) edges required for
accurate edge detection
Output switching only; may not meet datasheet speci-
fi cations
ΔDC within specifi cation
Output switching (no missed edges); ΔDC not
guaranteed
Wobble < 0.5 mm; Typical value at AG = 1.5 mm, for
max., min., AG within specifi cation
AG = 1.5 mm
Operating within specifi cation
Output switching (no missed edges); ΔDC not
guaranteed
CC(High)
ATS642LSH
, and dt is time period between those two points.
Test Conditions
CC(High)
CC(Low)
MAX
MAX
to I
to I
A
CC(High)
CC(Low)
and V
; positive peak
; negative peak
CC
within specifi cation, unless otherwise noted
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
Min.
0.5
20
41
30
20
0
–
–
–
–
–
–
Typ.
±1.5
120
120
±60
40
–
–
–
–
–
–
–
1
8,000
Max.
1000
2.75
61
–
–
–
3
–
3
–
–
Units
Edge
rpm
kHz
mm
mm
mV
mV
%
%
G
G
G
4