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參數(shù)資料
| 型號(hào)： | A1242LUA-I2-T |
| 廠商： | Allegro Microsystems Inc |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 297K |
| 描述： | IC LATCH HALL EFFECT 3-SIP |
| 產(chǎn)品培訓(xùn)模塊： | Current Sensor |
| 標(biāo)準(zhǔn)包裝： | 500 |
| 傳感范圍： | 80G 跳閘，-80G 釋放 |
| 類型： | 單極開關(guān) |
| 電源電壓： | 3.5 V ~ 24 V |
| 電流 - 電源： | 6.9mA |
| 輸出類型： | 數(shù)字式，開漏極 |
| 特點(diǎn)： | 穩(wěn)壓電壓 |
| 工作溫度： | -40°C ~ 150°C |
| 封裝/外殼： | 3-SIP |
| 供應(yīng)商設(shè)備封裝： | 3-SIP |
| 包裝： | 散裝 |
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, I
CC
, of the A1242 switches to the high current state
when a magnetic field perpendicular to the Hall element exceeds
the operate point threshold, B
OP
. 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 I
CC(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, B
RP
, 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, B
HYS
. 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, C
BYP
, connected between the supply, V
CC
, and the ground,
GND, of the device. C
BYP
reduces both external noise and the
noise generated by the chopper-stabilization function. As shown
in figure 2, a 0.01 糉 capacitor is typical.
Installation of C
BYP
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 C
BYP
, 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 C
BYP
, installed in parallel with the A1242.
A series resistor on the supply side, R
S
(not shown), in combina-
tion with C
BYP
, creates a filter for EMI pulses.
When determining the minimum V
CC
requirement of the A1242
device, the voltage drops across R
S
and the ECU sense resistor,
R
SENSE
, must be taken into consideration. The typical value for
R
SENSE
is approximately 100 ?
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
HYS
I
CC(H)
I
CC(L)
B+
I+
B
0
0
GND
A1242
VCC
V+
0.01 uF
A
B
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| A1243 | 制造商:Hakko 功能描述:Tip,0.8D,929 -2/939,903 Used With Soldering Stations |
| A1243LLHLX-I1-T | 功能描述:IC HALL EFFECT LTCH DGTL SOT23W 制造商:allegro microsystems, llc 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:10,000 |
| A1243LLHLX-I2-T | 功能描述:IC HALL EFFECT LTCH DGTL SOT23W 制造商:allegro microsystems, llc 系列:- 包裝:- 零件狀態(tài):有效 功能:- 技術(shù):- 極化:- 感應(yīng)范圍:- 測試條件:- 電壓 - 電源:- 電流 - 電源（最大值）:- 電流 - 輸出（最大值）:- 輸出類型:- 特性:- 工作溫度:- 封裝/外殼:- 供應(yīng)商器件封裝:- 標(biāo)準(zhǔn)包裝:10,000 |
| A1244 | 制造商:ALLEGRO 制造商全稱:Allegro MicroSystems 功能描述:Chopper-Stabilized, Two Wire Hall-Effect Latch |
| A-1244 | 制造商:TE Connectivity 功能描述: |
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