AATS643LSH_06 Datasheet, PDF (4/16 Pages) Allegro MicroSystems – Self-Calibrating, Zero-Speed Differential Gear Tooth Sensor with Continuous Update

ATS643LSH
Self-Calibrating, Zero-Speed Differential
Gear Tooth Sensor with Continuous Update
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
Bandwidth
S_ROT
BW
Reference Target 60-0
Equivalent to f – 3dB
0
– 12,000 rpm
25 40
–
kHz
Operate Point
Release Point
CALIBRATION³
Initial Calibration Period
AGC Calibration Disable
Start Mode Hysteresis
DAC CHARACTERISTICS
B_OP
% of peak to peak referenced from PDAC to NDAC,
AG < AG_MAX
B_RP
% of peak to peak referenced from PDAC to NDAC,
AG < AG_MAX
C_I
C_f
PO_HYS
Quantity of rising output (current) edges required for
accurate edge detection
Quantity of rising output (current) edges used for
calibrating AGC
–
65
–
%
–
35
–
%
–
–
3 Edge
–
–
3 Edge
– 175 – mV
Dynamic Offset Cancellation
Tracking Data Resolution
FUNCTIONAL CHARACTERISTICS
– ±60 –
G
Quantity of bits available for PDAC/NDAC tracking of
both positive and negative signal peaks
–
9
–
Bit
Air Gap Range⁴
Maximum Operable Air Gap
Duty Cycle Variation
AG
AG_(opmax)
ΔDC
ΔDC within specification
Output switching (no missed edges); ΔDC not
guaranteed
Wobble < 0.5 mm, AG within specification
0.5 – 2.5 mm
–
– 2.75 mm
–
– ±10 %
Input Signal Range
Sig
ΔDC within specification
40
– 1400 G
Minimum Operable Input Signal
Sig_(opmin)
Output switching (no missed edges); ΔDC 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 ICC(Low) and 90% of ICC(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.
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com