ATS667LSGTN-T Allegro Microsystems Inc, ATS667LSGTN-T Datasheet - Page 10

• Manufacturer Part Number: ATS667LSGTN-T
• Description: 3-WIRE TRUE 0-SPEED HI ACCURACY GTS
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of ATS667LSGTN-T

• Sensing Range: 70% of Air Gap Trip, 30% of Air Gap Release
• Voltage - Supply: 4 V ~ 24 V
• Current - Supply: 12mA
• Current - Output (max): 25mA
• Output Type: Digital, Open Collector
• Features: Gear Tooth Type
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Operating Supply Voltage (min): 4V
• Operating Supply Voltage (typ): 5/9/12/15/18V
• Operating Supply Voltage (max): 24V
• Output Current: 20mA
• Package Type: SIP Module(SG)
• Pin Count: 4
• Mounting: Through Hole
• Operating Temp Range: -40C to 150C
• Operating Temperature Classification: Automotive
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1328-2

ATS667LSG
Start Mode Hysteresis
This feature helps to ensure optimal self-calibration by rejecting
electrical noise and low-amplitude target vibration during
initialization. This prevents AGC from calibrating the IC on such
spurious signals. Calibration can be performed using the actual
target features.
Figure 5. Operation of Start Mode Hysteresis
• At power-on (position 1), the ATS667 begins sampling V
• At the point where the Start Mode Hysteresis, PO
• In either case, because the switchpoint is immediately passed as soon as it is established, the ATS667 enables switching:
As this example demonstrates, initial output switching occurs with the same polarity, regardless of whether the Start Mode Hysteresis is exceeded on the
high side or on the low side.
Update algorithm. If V
high side (position 4), it is B
Mode Hysteresis can be generated either by a legitimate target feature or by excessive vibration.
--If on the low side, at B
At the next switchpoint, where B
--If on the high side, at B
Output Signal, V
Differential Signal, V
Target Magnetic Profile
Start Mode
Hysteresis, PO
Relative to Target
OUT
PROC
RP
OP
Target, Gear
IC Position
(position 2) the output would switch from low to high. However, because output is already high, no output switching occurs.
is falling through the limit on the low side (position 2), the switchpoint is B
If exceed PO
on high side
If exceed PO
on low side
OP
(position 4) the output switches from high to low.
. After this point, Start Mode Hysteresis is no longer a consideration. Note that a valid V
PROC
OP
HYS
is passed (position 3), the output switches from high to low.
True Zero-Speed, High Accuracy Gear Tooth Sensor IC
HYS
HYS
B
1
RP(initial)
B
HYS
OP(initial)
, is exceeded, the device establishes an initial switching threshold, by using the Continuous
PROC
2
.
3
4
B
A typical scenario is shown in figure 5. The Start Mode Hysteresis,
PO
internal analog electrical signal, V
before the ATS667 starts to compute switchpoints.
OP
HYS
, is a minimum level of the peak-to-peak amplitude of the
B
RP
RP
, and if V
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
PROC
PROC
is rising through the limit on the
PROC
, that must be exceeded
value exceeding the Start
B
OP
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