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參數(shù)資料
| 型號(hào)： | A1242LLHLT-I1-T |
| 元件分類(lèi)： | 磁阻傳感器 |
| 英文描述： | MAGNETIC FIELD SENSOR-HALL EFFECT, -8-8mT, RECTANGULAR, SURFACE MOUNT |
| 封裝： | LEAD FREE, SOT-23W, 3 PIN |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 296K |
| 代理商： | A1242LLHLT-I1-T |
Two-Wire Chopper-Stabilized Hall Effect Latch
A1242
7
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Functional Description
Operation
The output, ICC, of the A1242 switches to the high current state
when a magnetic field perpendicular to the Hall element exceeds
the operate point threshold, BOP. Note that the device latches,
that is, a south pole of sufficient strength towards the branded
surface of the device switches the device output to ICC(H). The
device retains its output state if the south pole is removed. When
the magnetic field is reduced to below the release point thresh-
old, BRP, the device output goes to the low current state. The dif-
ference between the magnetic operate and release points is called
the hysteresis of the device, BHYS. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
.
Typical Application Circuit
The A1242 should be protected by an external bypass capaci-
tor, CBYP, connected between the supply, VCC, and the ground,
GND, of the device. CBYP reduces both external noise and the
noise generated by the chopper-stabilization function. As shown
in figure 2, a 0.01 μF capacitor is typical.
Installation of CBYP must ensure that the traces that connect it to
the A1242 pins are no greater than 5 mm in length.
All high-frequency interferences conducted along the supply
lines are passed directly to the load through CBYP, and it serves
only to protect the A1242 internal circuitry. As a result, the load
ECU (electronic control unit) must have sufficient protection,
other than CBYP, installed in parallel with the A1242.
A series resistor on the supply side, RS (not shown), in combina-
tion with CBYP, creates a filter for EMI pulses.
When determining the minimum VCC requirement of the A1242
device, the voltage drops across RS and the ECU sense resistor,
RSENSE, must be taken into consideration. The typical value for
RSENSE is approximately 100 Ω.
Extensive applications information on magnets and Hall-effect
devices is available in:
Hall-Effect IC Applications Guide, AN27701,
Guidelines for Designing Subassemblies
Using Hall-Effect Devices, AN27703.1
Soldering Methods for Allegro Products – SMD and Through-
Hole, AN26009
All are provided in Allegro Electronic Data Book, AMS-702 and
the Allegro Web site: www.allegromicro.com.
Figure 1. Switching Behavior of the A1242. On the horizontal axis, the
B+ direction indicates increasing south polarity magnetic field strength,
and the B– direction indicates decreasing south polarity field strength
(including the case of increasing north polarity).
B
OP
B
RP
BHYS
ICC(H)
I CC
ICC(L)
Switch
to
High
Switch
to
Low
B+
I+
B–
0
GND
A1242
VCC
V+
0.01 uF
A
B
GND
ECU
Package UA Only
A
B
Maximum separation 5 mm
R
SENSE
C
BYP
Figure 2. Typical Application Circuit
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| A1242LUA-I1-T | 功能描述:IC LATCH HALL EFFECT 3-SIP RoHS:是 類(lèi)別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開(kāi)關(guān)，線性，羅盤(pán) (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類(lèi)型:旋轉(zhuǎn) 電源電壓:4.5 V ~ 5.5 V 電流 - 電源:15mA 電流 - 輸出（最大）:- 輸出類(lèi)型:數(shù)字式，PWM，8.5 位串行 特點(diǎn):可編程 工作溫度:-40°C ~ 150°C 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:Digi-Reel® 其它名稱(chēng):AS5132-HSST-500DKR |
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