參數(shù)資料
型號： A1182
廠商： Allegro MicroSystems, Inc.
英文描述： Two-Wire, Programmable, Chopper-Stabilized, Unipolar Hall-Effect Switch
中文描述： 兩線，可編程，斬波穩(wěn)定，單極霍爾效應(yīng)開關(guān)
文件頁數(shù)： 10/16頁
文件大小： 356K
代理商： A1182
10
A1180-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
A1180/81/82/83
Application Information
For additional general application information, visit the Allegro
MicroSystems Web site at www. allegromicro.com.
GND
A118x
VCC
V+
0.01 uF
A
B
B
GND
ECU
Package UA Only
A
B
Maximum separation 5 mm
R
SENSE
C
BYP
Figure 3. Typical application circuit
Typical Application Circuit
The A118x family of devices must be protected by an external
bypass capacitor, C
BYP
, connected between the supply, VCC,
and the ground, GND, of the device. C
BYP
reduces both external
noise and the noise generated by the chopper-stabilization func-
tion. As shown in
fi
gure 3, a 0.01
μ
F capacitor is typical.
Installation of C
BYP
must ensure that the traces that connect it to
the A118x 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 A118x internal circuitry. As a result, the load
ECU (electronic control unit) must have suf
fi
cient protection,
other than C
BYP
, installed in parallel with the A118x.
A series resistor on the supply side, R
S
(not shown), in combi-
nation with C
BYP
, creates a
fi
lter for EMI pulses. (Additional
information on EMC is provided on the Allegro MicroSystems
Web site.)
When determining the minimum V
CC
requirement of the A118x
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
.
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