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參數(shù)資料
| 型號： | A1242ELHLT-I1-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Two-Wire Chopper-Stabilized Hall Effect Latch |
| 中文描述： | 兩線斬波穩(wěn)定霍爾效應(yīng)鎖存 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 363K |
| 代理商： | A1242ELHLT-I1-T |
7
A1242-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Two-Wire Chopper-Stabilized Hall Effect Latch
A1242
Functional Description
OPERATION
The output, I
CC
, of the A1242 switches to the high current state
when a magnetic field perpendicular to the Hall sensor 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
μ
F 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
Ω
.
Extensive applications information on magnets and Hall-effect
sensors is available in:
Hall-Effect IC Applications Guide,
AN27701,
Hall-Effect Devices: Gluing, Potting, Encapsulating, Lead Welding
and Lead Forming,
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
O
B
R
B
HYS
I
CC(H)
I
C
I
CC(L)
S
S
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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| A1242ELHLT-I2-T | 功能描述:IC LATCH HALL EFFECT SOT23W RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型: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:AS5132-HSST-500DKR |
| A1242EUA-I1-T | 功能描述:IC LATCH HALL EFFECT 3-SIP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型: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:AS5132-HSST-500DKR |
| A1242EUA-I2-T | 功能描述:IC LATCH HALL EFFECT 3-SIP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型: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:AS5132-HSST-500DKR |
| A1242LLHLT-I1-T | 功能描述:IC LATCH HALL EFFECT SOT-23W RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型: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:AS5132-HSST-500DKR |
| A1242LLHLT-I2-T | 功能描述:IC LATCH HALL EFFECT SOT-23W RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 磁性 - 霍爾效應(yīng)，數(shù)字式開關(guān)，線性，羅盤 (IC) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 傳感范圍:20mT ~ 80mT 類型: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:AS5132-HSST-500DKR |
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