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參數資料
| 型號： | ATS667LSGTN-T |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數： | 10/14頁 |
| 文件大?。?/td> | 424K |
| 描述： | IC SENSOR GEAR TOOTH 4SIP |
| 產品培訓模塊： | Current Sensor |
| 標準包裝： | 1 |
| 傳感范圍： | 70% 空氣間隙跳閘，30% 空氣間隙釋放 |
| 類型： | 專用型 |
| 電源電壓： | 4 V ~ 24 V |
| 電流 - 電源： | 12mA |
| 電流 - 輸出（最大）： | 25mA |
| 輸出類型： | 數字，開路集電極 |
| 特點： | 輪齒類型 |
| 工作溫度： | -40°C ~ 150°C |
| 封裝/外殼： | 4-SIP |
| 供應商設備封裝： | 4-SIP |
| 包裝： | 標準包裝 |
| 產品目錄頁面： | 1142 (CN2011-ZH PDF) |
| 其它名稱： | 620-1328-6 |
True Zero-Speed, High Accuracy Gear Tooth Sensor IC
ATS667LSG
10
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
B
RP
B
OP
B
OP
B
OP(initial)
B
RP(initial)
1
4
2
3
Start Mode
Hysteresis, PO
HYS
Output Signal, V
OUT
If exceed PO
HYS
on high side
If exceed PO
HYS
on low side
IC Position
Relative to Target
Target Magnetic Profile
Differential Signal, V
PROC
Target, Gear
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.
A typical scenario is shown in figure 5. The Start Mode Hysteresis,
PO
HYS
, is a minimum level of the peak-to-peak amplitude of the
internal analog electrical signal, V
PROC
, that must be exceeded
before the ATS667 starts to compute switchpoints.
Figure 5. Operation of Start Mode Hysteresis
" At power-on (position 1), the ATS667 begins sampling V
PROC
.
" At the point where the Start Mode Hysteresis, PO
HYS
, is exceeded, the device establishes an initial switching threshold, by using the Continuous
Update algorithm. If V
PROC
is falling through the limit on the low side (position 2), the switchpoint is B
RP
, and if V
PROC
is rising through the limit on the
high side (position 4), it is B
OP
. After this point, Start Mode Hysteresis is no longer a consideration. Note that a valid V
PROC
value exceeding the Start
Mode Hysteresis can be generated either by a legitimate target feature or by excessive vibration.
" In either case, because the switchpoint is immediately passed as soon as it is established, the ATS667 enables switching:
--If on the low side, at B
RP
(position 2) the output would switch from low to high. However, because output is already high, no output switching occurs.
At the next switchpoint, where B
OP
is passed (position 3), the output switches from high to low.
--If on the high side, at B
OP
(position 4) the output switches from high to low.
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.
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