Dynamic, Self-Calibrating, Peak-Detecting, Differential
Hall Effect Gear Tooth Sensor IC
ATS617LSG
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS (continued) over operating voltage and temperature range, unless otherwise noted
Characteristic Symbol Test Condition Min. Typ.
1
Max. Unit
Performance Characteristics (continued)
Initial Calibration Cycle
5
n
cal
Output edges before calibration is completed, at f
sig
< 100 Hz – 1 – edge
Calibration Mode Disable n
dis
Output falling edges for startup calibration to be complete 64 64 64 edge
Relative Timing Accuracy, Sequential
6,7
E
θ
Target Speed = 1000 rpm, B
AG(p-p)
> 100 G – ±0.5 ±0.75 deg.
Target Speed = 1000 rpm, B
AG(p-p)
> 60 G – – ±1.5 deg.
Allowable User Induced Differential Offset
4
∆B
App
Output switching only; may not meet data sheet specifica-
tions
– – ±50 G
Switching Hysteresis, Start-up V
SWHYS(su)
– 190 – mV
Switching Hysteresis, Running Mode V
SWHYS(rm)
– 105 – mV
1
Typical data is at V
CC
= 12 V and T
A
= 25°C. Performance may vary for individual units, within the specified maximum and minimum limits.
2
Maximum voltage must be adjusted for power dissipation and junction temperature; see Power Derating section.
3
This performance is not dominated by the design of the ATS617, it is determined primarily by the external interface circuitry.
4
1 G (gauss) = 0.1 mT (millitesla), exactly.
5
Non-uniform magnetic profiles may require additional edges before calibration is complete.
6
For Allegro 60+2 reference target.
7
Accuracy may be compromised during the calibration cycle.
