True Zero-Speed, High Accuracy Gear Tooth Sensor IC 
ATS667LSG
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
OPERATING CHARACTERISTICS (continued) Valid over operating voltage and temperature ranges; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.   Typ.
1
Max.    Unit
Switchpoint Characteristics
Operational Speed
S
ROT
Allegro 600 Reference Target
0
    12000    rpm
Bandwidth
f
-3dB
Cutoff frequency for low-pass filter
15    20

kHz
Operate Point
 B
OP
% of peak-to-peak V
PROC
 referenced from
PDAC to NDAC, AG < AG
max
, V
OUT
 high to low
     70

%
Release Point
 B
RP
% of peak-to-peak V
PROC
 referenced from
PDAC to NDAC, AG < AG
max
, V
OUT
 low to high
     30

%
Running Mode Lockout Enable (LOE)   V
LOE(RM)
V
PROC(PK-PK)
 < V
LOE(RM)
 = output switching
disabled
     100    
mV
Running Mode Lockout Release (LOR)  V
LOR(RM)
V
PROC(PK-PK)
 < V
LOR(RM)
 = output switching
enabled
     220    
mV
1
Typical data is at V
CC
 = 12 V and T
A
 = 25癈, unless otherwise noted. 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
Power-On Time is the time required to complete the internal Automatic Offset Adjust; the DACs are then ready for peak acquisition.
4
1 G (gauss) = 0.1 mT (millitesla).
5
The device compensates for magnetic and installation offsets. Offsets greater than specification in gauss may cause inaccuracies in the output.
6
For power-on S
ROT
 d 200 rpm, edges are sensed target mechanical edges (see figure Definitions of Terms for Switchpoints).
7
Operational Air Gap Range is dependent on the available magnetic field. The available field is target geometry and material dependent and should be
independently characterized. The field available from the Allegro 60-0 reference target is given in the reference target parameter section.
8
The repeatability specification is based on statistical evaluation of a sample population, evaluated at 1000 Hz. Repeatability is measured at 150癈
because the lowest signal-to-noise ratio for the V
PROC
 signal occurs at elevated temperatures. Therefore, the worst-case repeatability for the device
will also occur at elevated temperatures.
9
Single maximum allowable air gap change in outward direction (increase in air gap).
 
Valley
Tooth
Forward
Reverse
+B
B
+V
V
t
B
OP(FWD)
b
V
PROC(BOP)
V
PROC(BRP)
B
RP(FWD)
B
OP
%
B
RP
%
100 %
B
OP(REV)
b
B
RP(REV)
Sensed Edge
a
a
Sensed Edge: leading (rising) mechanical edge in forward rotation, trailing (falling) mechanical edge in reverse rotation
b
B
OP(FWD)
 triggers the output transition during forward rotation, and B
OP(REV)
 triggers the output transition during reverse rotation
Definitions of Terms for Switchpoints
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