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參數(shù)資料
| 型號： | ATS685LSHTN-T |
| 元件分類： | 磁阻傳感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, 5-150mT, CYLINDRICAL, THROUGH HOLE MOUNT |
| 封裝： | LEAD FREE, PLASTIC, SIP-4 |
| 文件頁數(shù)： | 14/15頁 |
| 文件大小： | 439K |
| 代理商： | ATS685LSHTN-T |
Two-Wire, Zero Speed
Differential Gear Tooth Sensor IC
ATS685LSH
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Determining Output Signal Polarity
In figure 2, the top panel, labeled Mechanical Position, represents
the mechanical features of the target gear and orientation to the
device. The bottom panel, labeled Device Output Signal, displays
the square waveform corresponding to the digital output signal
(current amplitude) that results from a rotating gear configured
as shown in figure 3. Referring to the target side nearest the face
of the sensor IC, the direction of rotation is: perpendicular to the
leads, across the face of the device, from the pin 1 side to the
pin 4 side.
In order to read the output signal as a voltage, VSENSE, a sense
resistor, RSENSE, can be placed on either the VCC signal or on
the GND signal. As shown in figure 4, when RSENSE is placed on
the GND signal, the output signal voltage, VSENSE(LowSide), is in
phase with ICC. When RSENSE is placed on the VCC signal, the
output signal voltage, VSENSE(HighSide), is inverted relative to ICC.
Rotating Target
Brande
of Package
Pin 1
Pin 4
dFace
Figure 3. This figure depicts left-to-right (pin 1 to pin 4) direction of target
rotation.
Figure 4. Alternative Polarity Configurations Using Two-Wire Sensing.
The Output Polarity States table provides the permutations of output
voltage relative to ICC, given alternative locations for RSENSE. Panel A
shows the low-side, VSENSE(LowSide), sensing configuration, and panel B
shows the high-side, VSENSE(HighSide), configuration. As shown in panel
C, VSENSE(LowSide) is in phase with ICC, and VSENSE(HighSide), is inverted.
ATS685
VCC
GND
V
CC
1
4
ATS685
VCC
GND
V
CC
1
4
VSENSE(HighSide)
VSENSE(LowSide)
RSENSE
I
CC
I
CC
Output Polarity States
RSENSE Location
ICC State
VSENSE State
High side
(VCC pin side)
High
Low
High
Low side
(GND pin side)
High
Low
ICC
VSENSE(HighSide)
V+
VSENSE(LowSide)
V+
I+
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