A1180EUA-T ALLEGRO [Allegro MicroSystems], A1180EUA-T Datasheet - Page 10

• Manufacturer Part Number: A1180EUA-T
• Description: Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall-Effect Switches
• Manufacturer: ALLEGRO [Allegro MicroSystems]

For additional general application information, visit the Allegro
MicroSystems Web site at www. allegromicro.com.
Typical Application Circuit
The A118x family of devices must be protected by an external
bypass capacitor, C
and the ground, GND, of the device. C
noise and the noise generated by the chopper-stabilization func-
tion. As shown in fi gure 3, a 0.01 μF capacitor is typical.
Installation of C
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
only to protect the A118x internal circuitry. As a result, the load
ECU (electronic control unit) must have suffi cient protection,
other than C
A series resistor on the supply side, R
nation with C
information on EMC is provided on the Allegro MicroSystems
Web site.)
When determining the minimum V
device, the voltage drops across R
R
R
A1180-DS, Rev. 2
SENSE
SENSE
Sensitive Two-Wire Field-Programmable Chopper-Stabilized Unipolar Hall Effect Switches
, must be taken into consideration. The typical value for
is approximately 100 Ω.
BYP
BYP
, installed in parallel with the A118x.
BYP
, creates a fi lter for EMI pulses. (Additional
BYP
must ensure that the traces that connect it to
, connected between the supply, VCC,
S
CC
and the ECU sense resistor,
S
requirement of the A118x
BYP
(not shown), in combi-
reduces both external
BYP
, and it serves
Application Information
A1180/81/82/83
Figure 3. Typical application circuit
V+
A
GND
A118x
ECU
VCC
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
R
GND
SENSE
A
B
Package UA Only
Maximum separation 5 mm
B
B
C
0.01 uF
BYP
10