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A1365LKTTN-5-T Datasheet(PDF) 22 Page - Allegro MicroSystems

Part No. A1365LKTTN-5-T
Description  Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A1365LKTTN-5-T Datasheet(HTML) 22 Page - Allegro MicroSystems

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Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
A1365
22
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Over Magnetic Field Fault
During normal operation, the ¯F¯¯A¯¯U¯¯L¯¯T¯ pin is in a high-impedance
state. The combination of an internal pull-up resistance with an
internal current source enables the ¯F¯¯A¯¯U¯¯L¯¯T¯ pin to be pulled high.
After the ¯F¯¯A¯¯U¯¯L¯¯T¯ pin reaches VSAT(HIGH), the current source is
shut down.
The user could install an external pull-up resistor on the ¯F¯¯A¯¯U¯¯L¯¯T¯
pin to reduce the amount of time required by the ¯F¯¯A¯¯U¯¯L¯¯T¯ pin to
reach VSAT(HIGH) after a fault event passes. An external pull-up
resistor can be connected to a voltage (VF(PULLUP)) different
from VCC as long as it remains within the VF(PULLUP) limits. If
VF(PULLUP) is less than VCC, the current provided by the internal
current source, IIF(PULLUP), will flow through the external pull-up
resistance causing a small voltage drop.
The A1365 offers a 6-bit programmable Ratiometric Fault as well
as a 2-bit programmable Ratiometric Fault Hysteresis.
Figure 17 illustrates the impact of programming 60 mV of Fault
Hysteresis on the Fault Switchpoint:
• FAULT_THRESH = 0, setting Positive and Negative Field
Fault Switchpoint (VFPSP, VFNSP) to the middle of their
programmable range.
• FAULT_HYST = 2, setting Fault Hysteresis Level to 60 mV.
The Fault Switchpoint is not affected by the selected Fault
Hysteresis Level.
The speed and accuracy with which a fault is triggered are
characterized by the Transient Fault Response Time (tTFR), the
DC Fault Switchpoint Error (errDFS), and the Fault Delay Due to
Load Capacitance (tFDC).
Figure 17: Fault Hysteresis Behavior at FAULT_
THRESH = 0, FAULT_HYST = 2
VFHYST
VFPSP
3940
4000
VFAULT (V)
5.0
0.1
VOUT (mV)
Figure 18: Fault Functional Circuit
GND
VF(PULLUP)
IIF(PULLUP)
RIF(PULLUP)
VCC
RF(PULLUP)
VOUT
A1365
VCC
V+
CBYPASS
CL
CF
(Optional)
FAULT
Figure 16: Fault Switchpoint Programming Profile
0313263
Max Specified
Switchpoint
Min Specified
Switchpoint
Mid Range
Fault
Switchpoint (V)
Specified Fault
Switchpoint Range
FLT_THRESH


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