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| 型號： | A1642LKTN-I2-T |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration |
| 中文描述： | 雙線真零高速微型差分峰值檢測與連續(xù)校準傳感器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 336K |
| 代理商： | A1642LKTN-I2-T |
10
A1642LK-DS
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Two-Wire True Zero-Speed Miniature Differential Peak-Detecting Sensor with Continuous Calibration
A1642LK
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
fi
cations. Refer to
fi
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
fi
cient V
CC
is sup-
plied. I
CC
levels may not meet datasheet limits when
V
CC
< V
CC(min)
.
Assembly Description
This sensor 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.
Diagnostics
The regulated current output is con
fi
gured for two wire appli-
cations, requiring one less wire for operation than do switches
with the more 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
narrow ranges, shown in figure 8 as I
CC(High)
and I
CC(Low)
. Any
current level not within these ranges indicates a fault condi-
tion. 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.
Figure 7: Typical Application Circuit
A1642
VCC
GND
4
V+
0.01
1
μF
ECU
Pins 2 and 3 floating
R
100
Ω
SENSE
C
BYP
Figure 8: Diagnostic Characteristics of Supply Current Values
I
CC(High)max
I
CC(High)min
Range for Valid I
CC(HIGH)
Range for Valid I
CC(LOW)
I
CC(Low)max
I
CC(Low)min
0
+mA
A
A
Short
Fault
Open
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