a1140euati-t Allegro MicroSystems, Inc., a1140euati-t Datasheet - Page 9

• Manufacturer Part Number: a1140euati-t
• Description: Sensitive Two-wire Chopper-stabilized Unipolar Hall Effect Switches
• Manufacturer: Allegro MicroSystems, Inc.

A1140, A1141,
A1142, and A1143
Typical Application Circuit
The A114x 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 figure 3, a 0.01 μF capacitor is typical.
Installation of C
the A114x 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 A114x internal circuitry. As a result, the load
ECU (electronic control unit) must have sufficient protection,
other than C
A series resistor on the supply side, RS (not shown), in combina-
tion with C
When determining the minimum V
device, the voltage drops across R
R
R
SENSE
SENSE
, must be taken into consideration. The typical value for
is approximately 100 Ω.
BYP
BYP
, creates a filter for EMI pulses.
, installed in parallel with the A114x.
BYP
BYP
must ensure that the traces that connect it to
, connected between the supply, VCC,
S
For additional general application information, visit the Allegro
Web site at www. allegromicro.com.
CC
and the ECU sense resistor,
requirement of the A114x
BYP
reduces both external
BYP
, and it serves
Application Information
Sensitive Two-Wire Chopper-Stabilized
Unipolar Hall Effect Switches
Figure 3. Typical application circuit
V+
A
GND
A114x
ECU
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
VCC
R
GND
SENSE
A
B
Package UA Only
Maximum separation 5 mm
B
B
C
0.01 μF
BYP
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