參數(shù)資料
型號(hào): ATS625LSGTN-T
廠商: Allegro Microsystems Inc
文件頁數(shù): 15/22頁
文件大?。?/td> 892K
描述: IC SENSOR GEAR TOOTH 4-SIP
產(chǎn)品培訓(xùn)模塊: Current Sensor
標(biāo)準(zhǔn)包裝: 800
傳感范圍: 60% 跳閘,40% 釋放
類型: 專用型
電源電壓: 4 V ~ 24 V
電流 - 電源: 14mA
電流 - 輸出(最大): 10mA
輸出類型: 數(shù)字,開路集電極
特點(diǎn): 輪齒類型
工作溫度: -40°C ~ 150°C
封裝/外殼: 4-SIP
供應(yīng)商設(shè)備封裝: 4-SIP
包裝: 帶卷 (TR)
True Zero-Speed Low-Jitter High Accuracy
Gear Tooth Sensor IC
ATS625LSG
14
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Switchpoints
Switchpoints in the ATS625 are a percentage of the amplitude of
the signal, V
PROC
, after normalization with AGC. In operation,
the actual switching levels are determined dynamically. Two
DACs track the peaks of V
PROC
 (see the Update subsection).
The switching thresholds are established at 40% and 60% of the
values held in the two DACs. The proximity of the thresholds
near the 50% level ensures the most accurate and consistent
switching, because it is where the slope of V
PROC
 is steepest and
least affected by air gap variation.
The low hysteresis, 20%, provides high performance over vari-
ous air gaps and immunity to false switching on noise, vibration,
backlash, or other transient events.
Figure 8 graphically demonstrates the establishment of the
switching threshold levels. Because the thresholds are established
dynamically as a percentage of the peak-to-peak signal, the effect
of a baseline shift is minimized. As a result, the effects of offsets
induced by tilted or off-center installation are minimized.
Update
The ATS625 incorporates an algorithm that continuously moni-
tors the system and updates the switching thresholds accordingly.
The switchpoint for each edge is determined by the signal result-
ing from the previous two edges. Because variations are tracked
in real time, the device 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 device uses historical data to provide the switching
threshold for a given edge.
Switching Threshold Levels
At Constant V
PROC
 Level
0
100
B
OP
V+
B
RP
Off    On    Off    On
60
40
Figure 8. Switchpoint Relationship to Thresholds.The device switches
when V
PROC
 passes a threshold level, B
OP
 or B
RP
, while changing in the
corresponding direction: increasing for a B
OP
 switchpoint, and decreasing
for a B
RP
 switchpoint.
Figure 9. Switchpoint Determination. The two previous V
PROC
 peaks are
used to determine the next threshold level: panel A, operate point, and
panel B, release point.
Dynamic B
OP
 Threshold Determination
Dynamic B
RP
 Threshold Determination
0
100
B
OP
V+
On    Off
60
0
100
V+
B
RP
Off    On
40
(A)
(B)
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