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參數(shù)資料
| 型號： | ATS645LSHTN-I2-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | True Zero Speed Miniature Gear Tooth Sensor |
| 中文描述： | 真正的零速微型齒輪齒傳感器 |
| 文件頁數(shù)： | 8/14頁 |
| 文件大小： | 418K |
| 代理商： | ATS645LSHTN-I2-T |
True Zero Speed Miniature Differential Peak-
Detecting Gear Tooth Sensor
ATS645LSH
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Sensing Technology
The gear tooth sensor subassembly contains a single-chip dif-
ferential Hall effect sensor IC, an optimized samarium cobalt
magnet, and a
fl
at ferrous pole piece. The Hall IC supports two
Hall elements, which sense the magnetic pro
fi
le of the ferrous
target simultaneously, but at different points (spaced at a 1.5 mm
pitch), generating a differential internal analog voltage (V
PROC
)
that is processed for precise switching of the digital output
signal.
The Hall IC is self-calibrating and also possesses a tempera-
ture compensated ampli
fi
er and offset cancellation circuitry. Its
voltage regulator provides supply noise rejection throughout the
operating voltage range. Changes in temperature do not greatly
affect this device due to the stable ampli
fi
er design and the offset
rejection circuitry. The Hall transducers and signal processing
electronics are integrated on the same silicon substrate, using a
proprietary BiCMOS process.
Target Profiling
An operating device is capable of providing digital information
that is representative of the mechanical features on a rotating tar-
get. The waveform diagram shown in
fi
gure 3 presents the auto-
matic translation of the mechanical pro
fi
le, through the magnetic
pro
fi
le that it induces, to the digital output signal of the sensor.
Output Polarity
Figure 3 shows the output polarity for the orientation of target
and sensor shown in
fi
gure 2. The target direction of rotation
shown is: perpendicular to the leads, across the face of the
device, from the pin 1 side to the pin 4 side. This results in the
sensor output switching from high, I
CC(High)
, to low I
CC(Low)
, as
the leading edge of a tooth (a rising mechanical edge, as detected
by the sensor) passes the sensor face. In this con
fi
guration, the
device output current switches to its low polarity when a tooth is
the target feature nearest to the sensor. If the direction of rota-
tion is reversed, then the output polarity inverts.
Note that output voltage polarity is dependent on the position of
the sense resistor, R
SENSE
(see
fi
gure 4).
Target
Mechanical Profile
Target (Gear)
Back-biasing Magnet
South Pole
North Pole
Case
(Pin 1 Side)
(Pin 4 Side)
Hall IC
Pole Piece
(Concentrator)
Element Pitch
Dual-Element
Hall Effect Device
Hall Element 1
Hall Element 2
of Sensor
Rotating Target
Branded Face
1
4
Functional Description
Figure 1. Relative motion of the target is detected by the dual Hall ele-
ments mounted on the Hall IC.
Figure 2. This left-to-right (pin 1 to pin 4) direction of target rotation
results in a low output signal when a tooth of the target gear is nearest
the face of the sensor (see
fi
gure 3). A right-to-left (pin 4 to pin 1) rota-
tion inverts the output signal polarity.
Figure 4: Voltages pro
fi
les for high side and low side two-wire sensing.
Figure 3. Output Pro
fi
le of a ferrous target for the polarity indicated in
fi
gure 2.
ATS645
VCC
GND
4
V
CC
I
CC
1
V
OUT(L)
ATS645
VCC
GND
4
V
CC
1
V
OUT(H)
I
CC
R
SENSE
R
SENSE
I
OUT
V
OUT(H)
V+
V
OUT(L)
V+
I+
Representative
Differential
Magnetic Profile
Sensor Electrical
Output Profile, I
OUT
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