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
?0 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
?0 %
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.
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