A1645LK-I2 Allegro Microsystems Inc, A1645LK-I2 Datasheet - Page 10

• Manufacturer Part Number: A1645LK-I2
• Description: IC SENSOR HALL EFFECT AC 4-SIP
• Manufacturer: Allegro Microsystems Inc
• Type: Special Purposer

Specifications of A1645LK-I2

• Sensing Range: 120mV Trip, 120mV Release
• Voltage - Supply: 4 V ~ 24 V
• Current - Supply: 8.4mA
• Output Type: Digital, Open Collector
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 4-SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Output (max): -
• Features: -

A1642
Power Supply Protection
The device contains an on-chip regulator and can operate over
a wide V
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 specifi 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
returns to the Power-On State (POS) until suffi cient V
plied. I
V
Figure 7: Typical Application Circuit
CC
< V
CC
CC(min)
CC
levels may not meet datasheet limits when
CC(UV)
Pins 2 and 3 floating
range. For devices that need to operate from an
.
ECU
, the device enters Reset, where the output state
V+
100 Ω
R
SENSE
A1642
GND
VCC
4
1
Peak-Detecting Sensor IC with Continuous Calibration
Two-Wire True Zero-Speed Miniature Differential
C
0.01
BYP
µF
CC
is sup-
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.
Diagnostics
The regulated current output is confi 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
current level not within these ranges indicates a fault condi-
tion. If I
I
between the allowed ranges for I
general fault condition.
Figure 8: Diagnostic Characteristics of Supply Current Values
CC
< I
CC(low)min
CC
> I
CC(High)max
I
I
I
I
CC(High)max
CC(High)min
CC(Low)max
CC(Low)min
, then an open condition exists. Any value of I
+mA
0
, then a short condition exists, and if
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
Short
Open
Fault
CC(High)
CC(High)


and I
Range for Valid I
Range for Valid I
and I
CC(Low)
CC(Low)
indicates a
CC(HIGH)
CC(LOW)
. Any
CC
10