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參數(shù)資料
| 型號： | A1645LK-I2 |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數(shù)： | 8/14頁 |
| 文件大?。?/td> | 356K |
| 描述： | IC SENSOR HALL EFFECT AC 4-SIP |
| 產(chǎn)品培訓(xùn)模塊： | Current Sensor |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 傳感范圍： | 120mV 跳閘，120mV 釋放 |
| 類型： | 專用型 |
| 電源電壓： | 4 V ~ 24 V |
| 電流 - 電源： | 8.4mA |
| 輸出類型： | 數(shù)字，開路集電極 |
| 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： | 散裝 |
Two-Wire True Zero-Speed Miniature Differential
Peak-Detecting Sensor IC with Continuous Calibration
A1642
8
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Sensing Technology
The single-chip differential Hall effect sensor IC possesses two
Hall elements, which sense the magnetic pro 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 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 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 gure 3 presents the
automatic translation of the magnetic pro le to the digital output
signal of the device.
Output Polarity
Figure 3 shows the output polarity for the orientation of target
and device shown in gure 2. The target direction of rota-
tion 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
device output switching from high, I
CC(High)
, to low I
CC(Low)
,
as the leading edge of a north magnetic pole passes the device
face. In this con guration, the device output current switches to
its low polarity when a north pole is the target feature nearest to
the device. 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 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 Device
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 device (see gure 3). A right-to-left (pin 4 to pin
1) rotation inverts the output signal polarity.
Figure 4: Voltage pro les for high side and low side two-wire sensing.
Figure 3. Output Pro le of a ring magnet target for the polarity
indicated in gure 2.
A1642
VCC
GND
V
CC
I
CC
1
4
V
OUT(L)
A1642
VCC
GND
V
SUPPLY
1
4
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
Device Electrical
Output Profile, I
OUT
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