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True Zero Speed Miniature Differential Peak-
Detecting Gear Tooth Sensor IC
ATS645LSH
10
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Power Supply Protection
The device contains an on-chip regulator and can operate over
a wide V
CC
 range. For devices that need to operate from an 
unregulated power supply, transient protection must be added
externally. For applications using a regulated line, EMI/RFI pro-
tection may still be required. Contact Allegro MicroSystems for
information on the circuitry needed for compliance with various
EMC speci cations. Refer to  gure 7 for an example of a basic
application circuit.
Undervoltage Lockout
When the supply voltage falls below the undervoltage lockout
voltage, V
CC(UV)
, the device enters Reset, where the output state
returns to the Power-On State (POS) until suf cient V
CC
 is sup-
plied. I
CC
 levels may not meet datasheet limits when
V
CC
 < V
CC(min)
.
Assembly Description
This device is integrally molded into a plastic body that has been
optimized for size, ease of assembly, and manufacturability.
High operating temperature materials are used in all aspects
of construction.
Figure 7: Typical Application Circuit
ATS645
VCC
GND
V+
0.01
1
4
 礔
ECU
Pins 2 and 3 floating
R
100 ?/DIV>
SENSE
C
BYP
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