参数资料
型号: A3242LUA-T
厂商: Allegro Microsystems Inc
文件页数: 9/13页
文件大小: 482K
描述: IC SW HALL EFFECT CHOPPER 3-SIP
标准包装: 500
传感范围: 200G 跳闸,110G 释放
类型: 单极开关
电源电压: 3.6 V ~ 24 V
电流 - 电源: 3.5mA
输出类型: 数字式,开漏极
特点: 稳压电压
工作温度: -40°C ~ 150°C
封装/外壳: 3-SIP
供应商设备封装: 3-SIP
包装: 散装
其它名称: 620-1050
Chopper-Stabilized Unipolar Hall Effect Switches
A3241 and
A3242
8
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
Functional Description
B
HYS
V
CC
V
OUT(SAT)
B+
B
V+
0
0
VCC
V
S
Output
GND
VOUT
R
LOAD
A324x
0.1 礔
C
BYP
Operation
The output of these devices switches low (turns on) when a
magnetic  eld (south polarity) perpendicular to the Hall ele-
ment exceeds the operate point threshold, B
OP
. After turn-on, the
output voltage is V
OUT(SAT)
. The output transistor is capable of
sinking current up to the short circuit current limit, I
OM
, which
is a minimum of 30 mA. When the magnetic  eld is reduced
below the release point, B
RP
, the device output goes high (turns
off). The difference in the magnetic operate and release points is
the hysteresis, B
hys
, of the device. This built-in hysteresis allows
clean switching of the output even in the presence of external
mechanical vibration and electrical noise.
Powering-on the device in the hysteresis region, less than B
OP
 
and higher than B
RP
, allows an indeterminate output state. The
correct state is attained after the  rst excursion beyond B
OP
 or
B
RP
.
Applications
It is strongly recommended that an external bypass capacitor be
connected (in close proximity to the Hall element) between the
supply and ground of the device to reduce both external noise
and noise generated by the chopper stabilization technique. As is
shown in Panel B of  gure 1, a 0.1糉 capacitor is typical.
Extensive applications information on magnets and Hall-effect
devices 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 Allegros Products  SMT 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 Unipolar Switches. In Panel A, on the horizontal axis, the B+ direction indicates increasing south polarity
magnetic  eld strength, and the B direction indicates decreasing south polarity  eld strength (including the case of increasing north
polarity). This behavior can be exhibited when using a circuit such as that shown in panel B.
(A)
(B)
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