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A1365 Datasheet

Programmable Linear Hall-Effect Sensor IC

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A1365 pdf
A1365
Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
FEATURES AND BENEFITS
• Proprietary segmented linear temperature compensation
(TC) technology provides a typical accuracy of 1% over
the full operating temperature range
• 120 kHz nominal bandwidth achieved via proprietary
packaging and chopper stabilization techniques
• Over Field Fault signal with 6-bit programmable trigger
levels, 2-bit programmable hysteresis, and latching or
non-latching behavior
Over Field Fault response time < 4.5 μs (typ)
• Extremely low noise and high resolution achieved via
proprietary Hall element and low-noise amplifier circuits
• Customer-programmable, high-resolution offset and
sensitivity trim
• Available in a 1-mm-thick SIP through-hole package
• Factory-programmed sensitivity and quiescent
output voltage TC with extremely stable temperature
performance
Continued on the next page…
PACKAGE:
4-Pin SIP (suffix KT)
Not to scale
DESCRIPTION
The A1365 linear output Hall-effect sensor IC is specifically
designed to provide a highly accurate output with improved
resolution at high bandwidth for use in current-sensing
applications. This device employs a segmented, linearly
interpolated temperature compensation technology, which
provides greater accuracy in sensitivity and offset voltage
trimming and hence virtually zero temperature drift. This
improvement greatly reduces the total error of the device across
the operating temperature range.
The highly programmable Over Field Fault signal (FAULT
pin) can be used to detect a high magnetic field condition.
Broken ground wire detection, undervoltage lockout for VCC
below specification, and user-selectable output voltage clamps
are also included, which are important for high reliability in
automotive applications. The sensor accuracy and diagnostic
capability make it ideally suited for automotive sockets such
as HEV inverter and DC-to-DC converter applications.
The A1365 Hall-effect sensor IC is extremely sensitive, fast,
and temperature-stable. The accuracy and flexibility of this
device is enhanced by user programmability, performed via
the VCC supply and the output pins, which allows the device
to be optimized in the application.
This ratiometric Hall-effect sensor IC provides a voltage output
that is proportional to the applied magnetic field. The quiescent
output voltage is user-adjustable around 50% (bidirectional) of
Continued on the next page…
V+
VCC (Programming)
CBYPASS
Temperature
Sensor
Programming
Control
EEPROM and
Control Logic
6 bits
Sensitivity Control
Offset Control
Signal Recovery
6-Bit Programmable Window Comparator
VREF(High)
0.88 × VCC to 0.72 × VCC
COMP_IN +
VREF(Low) +
0.12 × VCC to 0.28 × VCC
Internal
Pull-Up
FAULT
VOUT
(Programming)
A1365-GS-DS
GND
Functional Block Diagram



Allegro
Allegro

A1365 Datasheet Preview

A1365 Datasheet

Programmable Linear Hall-Effect Sensor IC

No Preview Available !

A1365 pdf
A1365
Low-Noise, High-Precision, Programmable Linear Hall-Effect Sensor IC
With High-Bandwidth (120 kHz) Analog Output and Integrated Fault Comparator
FEATURES AND BENEFITS (CONTINUED)
• Selectable sensitivity range between 0.6 and 14 mV/G through
use of coarse sensitivity program bits
• Ratiometric sensitivity, quiescent voltage output, and
clamps enable simple interface with application A-to-D
converter (ADC)
• Output voltage clamps provide short-circuit diagnostic
capabilities
• Open-circuit detection on ground pin (broken wire)
• Undervoltage lockout for VCC below specification
• Wide ambient temperature range: –40°C to 150°C
DESCRIPTION (CONTINUED)
the supply voltage, VCC . The device sensitivity is adjustable within
the range of 0.6 to 14 mV/G.
The A1365 incorporates a highly sensitive Hall element with a
BiCMOS interface integrated circuit that employs temperature-
compensation circuitry to reduce the intrinsic sensitivity and offset
drift of the Hall element.The IC also includes a small-signal high-gain
amplifier, a clamped low-impedance output stage, and a proprietary
high-bandwidth dynamic offset cancellation technique.
Device specifications apply across an extended ambient temperature
range: –40°C to 150°C. The A1365 sensor IC is provided in an
extremely thin case (1 mm thick), 4-pin SIP (single inline package,
suffix KT) that is lead (Pb) free, with 100% matte-tin leadframe
plating.The thin package allows for better magnetic coupling because
the smaller the air gap in the core is, the higher the coupling from
current to magnetic field will be.
Selection Guide
Part Number
Package
Packing1
Sensitivity Range2
(mV/G)
A1365LKTTN-1-T
4-pin SIP
4000 pieces per 13-in. reel
0.6 to 1.3
A1365LKTTN-2-T
4-pin SIP
4000 pieces per 13-in. reel
1.3 to 2.9
A1365LKTTN-5-T
4-pin SIP
4000 pieces per 13-in. reel
2.9 to 6.4
A1365LKTTN-10-T
4-pin SIP
4000 pieces per 13-in. reel
6.4 to 14
1 Contact Allegro for additional packing options.
2 Allegro recommends against changing Coarse Sensitivity settings when programming devices that will be used in production.
Each A1365 has been factory temperature compensated at a specific sensitivity range, and changing the coarse bits setting could
cause sensitivity drift through temperature range (ΔSensTC ) to exceed specified limits.
Specifications
Absolute Maximum Ratings
Thermal Characteristics
Pinout Diagram and Terminal List Table
Operating Characteristics
Characteristic Performance Data
Characteristic Definitions
Functional Description
Programming Sensitivity and Quiescent
Voltage Output
Coarse Sensitivity
Memory-Locking Mechanisms
Power-On Reset (POR) and Undervoltage
Lockout (UVLO) Operation
Detecting Broken Ground Wire
Over Magnet Field Fault
Table of Contents
3
Programming Serial Interface
24
3 Transaction Types
24
3 Writing the Access Code
24
4 Writing to Volatile Memory 24
5 Writing to EEPROM
25
9
Reading from EEPROM or Volatile Memory
25
13 Error Checking
25
19 Serial Interface Reference 26
Serial Interface Message Structure
27
19 VCC Levels During Manchester Communication 27
19 Shadow Mode
28
19 EEPROM Margining
29
EEPROM Cell Organization
30
20 EEPROM Error Checking and Correction (ECC) 30
21 Detecting ECC Error
30
22 Package Outline Drawing
31
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A1365
Description Programmable Linear Hall-Effect Sensor IC
Maker Allegro
Total Page 30 Pages
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