參數(shù)資料
型號(hào): ATS674LSETN-LT-T
元件分類(lèi): 速度傳感器和接近開(kāi)關(guān)
英文描述: PROXIMITY SENSOR-HALL EFFECT, 0.5-2.5mm, 450mV, ROUND, THROUGH HOLE MOUNT
封裝: PLASTIC, SIP-4
文件頁(yè)數(shù): 5/19頁(yè)
文件大?。?/td> 640K
代理商: ATS674LSETN-LT-T
Self-Calibrating TPOS Gear Tooth Sensor Optimized
for Automotive Cam Sensing Applications
ATS673 and
ATS674
13
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Pk4
Pk5
Pk7
Pk9
Pk2
Pk3
Pk1
Pk6
Pk8
V
PROC
(V
BRP1
BOP1
BRP2
BRP3
BOP3
BRP4
BOP4
B
HYS
B
HYS
B
HYS
B
HYS
t+
V+
B
HYS
B
HYS
B
HYS
BOP2
B
HYS
(A) TEAG varying; cases such as
eccentric mount, out-of-round region,
normal operation position shift
(B) Internal analog signal, VPROC,
typically resulting in the sensor
0
360
Target Rotation (°)
Hysteresis Band
(Delimited by switchpoints)
V
PROC
(V)
V+
Larger
TEAG
Smaller
TEAG
Sensor
Target
Larger
TEAG
Target
Sensor
Smaller
TEAG
Smaller
TEAG
Figure 9. The Continuous Update algorithm allows the Allegro sensor to immediately interpret and adapt to significant variances in the magnetic field
generated by the target as a result of eccentric mounting of the target, out-of-round target shape, elevation due to lubricant build-up in journal gears, and
similar dynamic application problems that affect the TEAG (Total Effective Air Gap). The algorithm is used to dynamically establish and subsequently
update the device switchpoints (BOP and BRP). The hysteresis, BHYS(#x), at each target feature configuration results from this recalibration, ensuring that
it remains properly proportioned and centered within the peak-to-peak range of the internal analog signal, VPROC.
As shown in panel A, the variance in the target position results in a change in the TEAG. This affects the sensor as a varying magnetic field, which
results in proportional changes in the internal analog signal, VPROC, shown in panel B. The Continuous Update algorithm is used to establish accurate
switchpoints based on the fluctuation of VPROC, as shown in panel C.
(C) Referencing the internal analog signal, VPROC, to continuously update device response
Switchpoint
Determinant
Peak Values
BOP1
Pk1, Pk2
BRP1
Pk2, Pk3
BOP2
Pk3, Pk4
BRP2
Pk4, Pk5
BOP3
Pk5, Pk6
BRP3
Pk6, Pk7
BOP4
Pk7, Pk8
BRP4
Pk8, Pk9
Update
The ATS673 and ATS674 incorporate an algorithm that continu-
ously monitors the system and updates the switching thresholds
accordingly. The switchpoint for each transition is determined
by the previous two transitions. Because variations are tracked
in real time, the sensor has high immunity to target run-out and
retains excellent accuracy and functionality in the presence of
both run-out and transient mechanical events. Figure 9 shows
how the devices use historical data to provide the switching
thresholds for a given edge.
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