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參數資料
| 型號： | A1642LKTN-I2-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration |
| 中文描述： | 雙線真零高速微型差分峰值檢測與連續(xù)校準傳感器 |
| 文件頁數： | 8/13頁 |
| 文件大?。?/td> | 336K |
| 代理商： | A1642LKTN-I2-T |
8
A1642LK-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration
A1642LK
Sensing Technology
The single-chip differential Hall effect sensor IC possesses two
Hall elements, which sense the magnetic pro
fi
le of the ring mag-
net 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 temperature
compensated ampli
fi
er and offset compensation 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
compensation circuitry. The Hall transducers and signal process-
ing electronics are integrated on the same silicon substrate, using
a proprietary BiCMOS process.
Target Profiling
An operating device is capable of providing digital informa-
tion that is representative of the magnetic features on a rotating
target. The waveform diagram shown in
fi
gure 3 presents the
automatic translation of the magnetic pro
fi
le 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 north magnetic pole passes the sensor
face. In this con
fi
guration, the device output current switches to
its low polarity when a north pole is the target feature nearest to
the sensor. If the direction of rotation 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
(Ring Magnet)
(Pin 1 Side)
(Pin 4 Side)
Hall IC
Element Pitch
Hall Element 1
Hall Element 2
N
N
S
S
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 magnetic north pole of the target is
nearest the face of the sensor (see
fi
gure 3). A right-to-left (pin 4 to pin
1) rotation 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 ring magnet target for the polarity
indicated in
fi
gure 2.
A1642
VCC
GND
4
V
CC
I
CC
1
V
OUT(L)
A1642
VCC
GND
4
V
SUPPLY
1
V
OUT(H)
I
CC
R
SENSE
R
SENSE
I
OUT
V
OUT(H)
V+
V
OUT(L)
V+
I+
N
N
S
S
Representative
Differential
Magnetic Profile
Target
Ring Magnet
Sensor Electrical
Output Profile, I
OUT
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