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參數(shù)資料
| 型號： | ATS627LSGTN-T |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數(shù)： | 16/22頁 |
| 文件大小： | 498K |
| 描述： | IC HALL EFFECT GEAR SENSOR 4-SIP |
| 特色產(chǎn)品： | ATS627 Position Sensor IC |
| 標準包裝： | 1 |
| 傳感范圍： | 3mT ~ 120mT |
| 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(shù)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(yīng)商設(shè)備封裝： | 4-SIP |
| 包裝： | 標準包裝 |
| 其它名稱： | 620-1398-6 |
True Zero Speed, Low Jitter, High Accuracy
Position Sensor IC
ATS627LSG
16
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Description
Sensing Technology
The ATS627 contains a single-chip differential Hall-effect sensor
IC, a samarium cobalt pellet, and a flat ferrous pole piece (con-
centrator). As shown in figure 5, the Hall IC supports two Hall
elements, which sense the magnetic profile of the ferrous gear
target simultaneously, but at different points (spaced at a 2.2 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 amplifier and offset cancellation circuitry. The
built-in voltage regulator provides supply noise rejection through-
out the operating voltage range. Changes in temperature do not
greatly affect this device due to the stable amplifier design and
the offset compensation circuitry. The Hall transducers and signal
processing electronics are integrated on the same silicon sub-
strate, using a proprietary BiCMOS process.
Target Profiling During Operation
An operating device is capable of providing digital information
that is representative of the mechanical features of a rotating gear.
The waveform diagram in figure 7 presents the automatic transla-
tion of the mechanical profile, through the magnetic profile that
it induces, to the digital output signal of the ATS627. No addi-
tional optimization is needed and minimal processing circuitry is
required. This ease of use reduces design time and incremental
assembly costs for most applications.
Determining Output Signal Polarity
In figure 7 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
that results from a rotating gear configured as shown in figure 6,
and electrically connected as in figure 9. That direction of rota-
tion (of the gear side adjacent to the package face) is: perpen-
dicular to the leads, across the face of the device, from the pin 1
side to the pin 4 side. This results in the IC output switching from
low state to high state as the leading edge of a tooth (a rising
mechanical edge, as detected by the IC) passes the package face.
In this configuration, the device output switches to its high polar-
ity when a tooth is the target feature nearest to the package. If the
direction of rotation is reversed, so that the gear rotates from the
pin 4 side to the pin 1 side, then the output polarity inverts. That
is, the output signal goes high when a falling edge is detected,
and a valley is nearest to the package.
Figure 5. Relative motion of the target is detected by the dual
Hall elements in the Hall IC.
Figure 6. This left-to-right (pin 1 to pin 4) direction of target rotation results
in a high output state when a tooth of the target gear is nearest the
package face (see figure 3). A right-to-left (pin 4 to pin 1) rotation inverts
the output signal polarity.
Figure 7: The magnetic profile reflects the geometry of the target, allowing
the ATS627 to present an accurate digital output response.
B
OP(#1)
B
RP(#1)
B
RP(#2)
B
OP(#2)
On
Off
Off
On
Device Internal Switch State
Device Orientation to Target
Device Internal Differential Analog Signal, V
PROC
Mechanical Position (Target movement pin 1 to pin 4)
Device Output Signal, V
OUT
Target
(Gear)
(Package Top View)
Sensor Branded Face
Pin 1
Side
Pin 4
Side
Branded Face
Hall Element Pitch
Target Magnetic Profile
+B
This tooth
sensed earlier
This tooth
sensed later
IC
Back-Biasing
Rare-Earth Pellet
RotatingTarget
BrandedFace
of Sensor
Pin 1
Pin 4
Target (Gear)
Back-biasing Magnet
South Pole
North Pole
Case
(Pin 1 Side)
(Pin 4 Side)
Hall IC
Pole Piece
Element Pitch
(Concentrator)
Dual-Element
Hall Effect Device
Hall Element 1
Hall Element 2
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