Miniature, Two-Wire, True Zero Speed
Differential Peak-Detecting Sensor IC
ATS682LSH
11
Allegro MicroSystems, LLC
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 unregu-
lated power supply, transient protection must be added externally.
For applications using a regulated line, EMI/RFI protection may
still be required. Contact Allegro for information on the circuitry
needed for compliance with various EMC specifications. Refer to
figure 7 for an example of a basic application circuit.
Undervoltage Lockout
When the supply voltage falls below the undervoltage lockout
threshold, V
CC(UV)
, the device enters Reset mode, where the
output state returns to the Power-On State (POS) until sufficient
V
CC
is supplied. I
CC
levels may not meet datasheet limits when
V
CC
< V
CC
(min).
Assembly Description
This device is molded into a plastic body that has been optimized
for size, ease of assembly, and manufacturability. High operat-
ing temperature materials are used in all aspects of construction.
Refer to the Allegro website, www.allegromicro.com, for more
specific applications notes on finished package processing.
Diagnostics
The regulated current output is configured for two-wire applica-
tions, requiring one less wire for operation than do switches with
the traditional open-collector output. Additionally, the system
designer inherently gains diagnostics because there is always
output current flowing, which should be in either of two nar-
row ranges, shown in figure 8 as I
CC(HIGH)
and I
CC(LOW)
. Any
current level not within these ranges indicates a fault condition.
If I
CC
> I
CC(HIGH)
(max), then a short condition exists, and if I
CC
< I
CC(LOW)
(min), then an open condition exists. Any value of I
CC
between the allowed ranges for I
CC(HIGH)
and I
CC(LOW)
indicates
a general fault condition.
ATS682
VCC
GND
V+
0.01
1
4
糉
ECU
Test pin floating
R
100
SE
C
LOAD
NSE
C
BYP
I
CC(HIGH)
(max)
I
CC(HIGH)
(min)
I
CC(LOW)
(max)
I
CC(LOW)
(min)
Range for Valid I
CC(HIGH)
Range for Valid I
CC(LOW)
0
+mA
A
A
Short
Fault
Open
Figure 7. Typical application circuit
Figure 8. Diagnostic characteristics of supply current values
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