Coarse
Offset
A to D
Conversion
SENT/PWM
Output Driver
Output
Bandwidth
and
Temperature
Compensation
...00110011...
Analog Subsystem Output Stage
Magnetic
Signal
Hall
Element
Magnetic
Input Range/
Coarse
Sensitivity
Sensitivity
and
Fine Offset
Adjustment
Linearization Clamps
Digital Signal Processing
12-bit
DESCRIPTION
The A1343 device is a high-precision, programmable Hall-
effect linear sensor integrated circuit (IC) with an open-drain
output, configurable as pulse-width modulated (PWM) or
single edge nibble transmission (SENT), for both automotive
and nonautomotive applications. The signal path of the A1343
provides flexibility through external programming that allows
the generation of an accurate and customized output voltage
from an input magnetic signal. The A1343 provides 12 bits of
output resolution, and supports a maximum bandwidth of 3 kHz.
The BiCMOS, monolithic integrated circuit incorporates a
Hall sensor element, precision temperature-compensating
circuitry to reduce the intrinsic sensitivity and offset drift of the
Hall element, a small-signal high-gain amplifier, proprietary
dynamic offset cancellation circuits, and advanced output
linearization circuitry.
With on-board EEPROM and advanced signal processing
functions, the A1343 provides an unmatched level of customer
reprogrammable options for characteristics such as gain and
offset, bandwidth, output clamps, and magnetic range selection.
In addition, the device supports separate hot and cold, 1
st
- and
2
nd
-order temperature compensation.
A key feature of the A1343 is its ability to produce a highly
linear device output for nonlinear input magnetic fields.
To achieve this, the device divides the output into 32 equal
segments and applies a unique linearization coefficient factor
to each segment. Linearization coefficients are stored in a
lookup table in EEPROM.
The A1343 is available in a lead (Pb) free 8-pin TSSOP package
(LE suffix), with 100% matte-tin leadframe plating.
A1343-DS, Rev. 8
MCO-0000162
FEATURES AND BENEFITS
• Advanced 32-segment output linearization functionality
enables high output accuracy and linearity in the
presence of nonlinear input magnetic fields
• Selectable digital SENT (Single Edge Nibble
Transmission) and PWM (Pulse-Width Modulation)
output
• SENT output supports two modes: SAEJ2716 JAN2010
and Allegro Proprietary with Enhanced Programmable
Features
• Customer-programmable magnetic range selection and
offset, sensitivity, bandwidth, output clamps, 1
st
- and
2
nd
-order temperature compensation
• Simultaneous programming of all parameters for accurate
and efficient system optimization
• Initial sensitivity temperature coefficient and magnetic
offset drift preset at Allegro, for maximum device
accuracy without requiring customer temperature testing
��� Temperature-stable, mechanical stress immune, and
extremely low noise device output via proprietary
four-phase chopper stabilization and differential circuit
design techniques
• Wide ambient temperature range: –40°C to 150°C
• Operates with 4.5 to 5.5 V supply voltage
High-Precision, Highly Programmable Linear Hall-Effect Sensor IC with EEPROM,
Output Protocols SENT and PWM, and Advanced Output Linearization
A1343
Figure 1: A1343 Signal Processing Path.
Functions with programmable parameters indicated by double-headed arrows.
PACKAGE: 8-PIN TSSOP (SUFFIX LE)
Not to scale
June 20, 2018
High-Precision, Highly Programmable Linear Hall-Effect Sensor IC
with EEPROM, Output Protocols SENT and PWM, and Advanced Output Linearization
A1343
2
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Unit
Forward Supply Voltage V
CC
30 V
Reverse Supply Voltage V
RCC
–20 V
Forward Supply Current I
CC
30 mA
Reverse Supply Current I
RCC
–30 mA
Forward Output Voltage (OUT Pin) V
OUT
30 V
Reverse Output Voltage (OUT Pin) V
ROUT
–0.5 V
Forward Output Sink Current (OUT Pin) I
SINK
Current limited 60 mA
Operating Ambient Temperature T
A
L temperature range –40 to 150 ºC
Maximum Junction Temperature T
J
(max) 165 ºC
Storage Temperature T
stg
–65 to 165 ºC
Selection Guide
Part Number Packing*
A1343LLETR-T 4000 pieces per 13-in. reel
*Contact Allegro
™
for additional packing options.
Table of Contents
Specifications 3
Pinout Diagram and Terminal List 3
Functional Block Diagram 3
Operating Characteristics 4
Thermal Characteristics 9
Functional Description 10
Signal Processing Parameter Setting 10
Analog Input Full Scale Range Determination 10
Analog Input Range Setting 11
Analog Magnetic Offset Selection 11
Digital Signal Processing 11
Bandwidth Selection 11
Temperature Compensation 12
Final Sensitivity (Gain) Adjustment 13
Output Fine Offset Adjustment 14
Linearization of Output 14
Output Polarity Setting 14
Output Clamps Setting 14
Output Protocol Selection 14
Protection Features 14
Memory Locking Mechanisms 15
Typical Application 16
Programming Serial Interface 17
Transaction Types 17
Writing the Access Code 17
Writing to EEPROM 17
Reading from EEPROM 18
Error Checking 18
Serial Interface Reference 19
Linear Output Protocols 24
PWM Output Mode 24
SENT Output Mode 25
EEPROM Structure 31
EEPROM Parameter Reference 32
Definitions of Terms 48
Package Outline Drawing 52