A1343
High-Precision, Highly Programmable Linear Hall-Effect Sensor IC with EEPROM,
Output Protocols SENT and PWM, and Advanced Output Linearization
•
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
FEATURES AND BENEFITS
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.
DESCRIPTION
PACKAGE: 8-PIN TSSOP (SUFFIX LE)
Not to scale
Analog Subsystem
...00110011...
Digital Signal Processing
Output Stage
Magnetic
Signal
Magnetic
Hall
Input Range/
Element
Coarse
Sensitivity
Coarse
Offset
12-bit
Bandwidth
and
Temperature
Compensation
Sensitivity
and
Fine Offset
Adjustment
Output
A to D
Conversion
Linearization
Clamps
SENT/PWM
Output Driver
Figure 1: A1343 Signal Processing Path.
Functions with programmable parameters indicated by double-headed arrows.
A1343-DS, Rev. 8
MCO-0000162
June 20, 2018
A1343
Selection Guide
Part Number
A1343LLETR-T
High-Precision, Highly Programmable Linear Hall-Effect Sensor IC
with EEPROM, Output Protocols SENT and PWM, and Advanced Output Linearization
Packing*
4000 pieces per 13-in. reel
*Contact Allegro
™
for additional packing options.
Absolute Maximum Ratings
Characteristic
Forward Supply Voltage
Reverse Supply Voltage
Forward Supply Current
Reverse Supply Current
Forward Output Voltage (OUT Pin)
Reverse Output Voltage (OUT Pin)
Forward Output Sink Current (OUT Pin)
Operating Ambient Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
V
CC
V
RCC
I
CC
I
RCC
V
OUT
V
ROUT
I
SINK
T
A
T
J
(max)
T
stg
Current limited
L temperature range
Notes
Rating
30
–20
30
–30
30
–0.5
60
–40 to 150
165
–65 to 165
Unit
V
V
mA
mA
V
V
mA
ºC
ºC
ºC
Specifications
Functional Description
Pinout Diagram and Terminal List
Functional Block Diagram
Operating Characteristics
Thermal Characteristics
Signal Processing Parameter Setting
Analog Input Full Scale Range Determination
Analog Input Range Setting
Analog Magnetic Offset Selection
Digital Signal Processing
Bandwidth Selection
Temperature Compensation
Final Sensitivity (Gain) Adjustment
Output Fine Offset Adjustment
Linearization of Output
Output Polarity Setting
Output Clamps Setting
Output Protocol Selection
3
3
3
4
9
10
10
10
11
11
11
11
12
13
14
14
14
14
14
Table of Contents
Protection Features
Memory Locking Mechanisms
Typical Application
Transaction Types
Writing the Access Code
Writing to EEPROM
Reading from EEPROM
Error Checking
Serial Interface Reference
Programming Serial Interface
Linear Output Protocols
EEPROM Structure
PWM Output Mode
SENT Output Mode
Definitions of Terms
Package Outline Drawing
EEPROM Parameter Reference
14
15
16
17
17
17
17
18
18
19
24
24
25
31
32
48
52
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
2
A1343
High-Precision, Highly Programmable Linear Hall-Effect Sensor IC
with EEPROM, Output Protocols SENT and PWM, and Advanced Output Linearization
Functional Block Diagram
VCC
UVLO
OVLO
Coarse Sensitivity
and Magnetic
Range Setting
Analog
Front End
12
POR
Analog
Regulator
Clock
Generator
Digital
Regulator
Serial
Decode
Coarse
Offset
Trim
EEPROM
HV Pulse
Digital
Subsystem
Serial
Interface
Bandwidth
Select
Master
Control
ADC
Hall
Element
Anti-Alias
Filter
Temperature
Sensor
Precision
Reference
ADC
A/D
EEPROM
Control
Scan/
IDDQ
Pulse
Detect
12
Temperature
Compensation
Digital
Sensitivity
and Offset Trim
Linear-
ization
Clamp
SENT/
PWM
Driver
OUT
GND
Pinout Diagram
VCC 1
GND 2
GND 3
OUT 4
8 NC
7 NC
6 NC
5 NC
Terminal List Table
Number
1
2
3
4
5, 6, 7, 8
Name
VCC
GND
GND
OUT
NC
Function
Input power supply
Device ground
Device ground
Output pin
Not connected; Recommend connecting
pin to ground for application use.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
3
A1343
High-Precision, Highly Programmable Linear Hall-Effect Sensor IC
with EEPROM, Output Protocols SENT and PWM, and Advanced Output Linearization
ELECTRICAL CHARACTERISTICS:
Valid through full operating temperature range, T
A
, and supply voltage, V
CC
, C
BYPASS
= 10 nF,
unless otherwise specified
Characteristics
Supply Voltage
Supply Current
Reverse Supply Current
Supply Zener Clamp Voltage
Hall Chopping Frequency
Low Voltage Detection Threshold
Power-On Reset
Symbol
V
CC
I
CC
I
RCC
V
ZSUPPLY
f
C
V
RCC
= 20 V
I
CC
= I
CC
(max) + 3 mA, T
A
= 25°C
T
A
= 25°C
LVD_DIS = 1
Test Conditions
Min.
4.5
5
–
30
–
4.25
4.35
3.5
3.6
OVLO_LO = 1, T
A
= 25°C
OVLO_LO = 0, T
A
= 25°C
OVLO_LO = 1, T
A
= 25°C
OVLO_LO = 0, T
A
= 25°C
Tick time = 3 µs
PWM_MODE = 1
Tick time = 0.25 µs, 3 data nibbles of
information, nibble length = 27 ticks
Output FET off
I
SINK
= 4.7 mA
Output FET on, T
A
= 25°C
T
A
= 25°C
OUT to GND
BW parameter = 1
BW parameter = 0,2
Power-On Time
4,6
t
PO
BW parameter = 3
BW parameter = 4
BW parameter = 5
BW parameter = 1
BW parameter = 0,2
Signal Path Propagation Delay
4,6
t
SDLY
BW parameter = 3
BW parameter = 4
BW parameter = 5
5.6
18
5.8
18.3
–
–15
–
Typ.
–
–
–
–
128
4.4
4.5
3.7
3.8
–
–
–
–
1
–
41
Max.
5.5
10
–3
–
–
4.55
4.65
4.1
4.15
7.6
20
7.9
20.3
–
15
–
Unit
1
V
mA
mA
V
kHz
V
V
V
V
V
V
V
V
ms
%
µs
GENERAL ELECTRICAL CHARACTERISTICS
V
CC(LVD)LOW
LVD_DIS = 0
V
CC(LVD)HIGH
LVD_DIS = 0
POR
LOW
POR
HIGH
V
CC(OV)LOW
Overvoltage Lockout Threshold
V
CC(OV)HIGH
SENT Message Duration
Output PWM Period
2
Minimum Programmable SENT
Message Duration
Output Leakage Current
Output Saturation Voltage
3
Output Current Limit
Output Zener Clamp Voltage
Output Load Capacitance
4,5
t
SENT
V
PERIOD
t
SENTMIN
OUTPUT ELECTRICAL CHARACTERISTICS
I
OUT(LOW)
V
SAT
I
LIMIT
V
ZOUT
C
LOAD
–
–
20
30
–
–
–
–
–
–
–
–
–
–
–
–
0.3
35
–
–
0.5
0.8
2
3
6
0.35
0.7
1.4
2.8
5.6
100
0.45
60
–
10
–
–
–
–
–
–
–
–
–
–
µA
V
mA
V
nF
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
Continued on the next page…
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
4
A1343
High-Precision, Highly Programmable Linear Hall-Effect Sensor IC
with EEPROM, Output Protocols SENT and PWM, and Advanced Output Linearization
ELECTRICAL CHARACTERISTICS (continued):
Valid through full operating temperature range, T
A
, and supply voltage, V
CC
,
C
BYPASS
= 10 nF, unless otherwise specified
Characteristics
Symbol
Test Conditions
PWM_MODE = 1 (PWM mode), CLAMP_HIGH
= CLAMP_LOW = 0 (PWM duty cycle)
PWM_MODE = 0 (SENT mode)
1
1
2
The
Min.
Typ.
Max.
Unit
1
OUTPUT ELECTRICAL CHARACTERISTICS (continued)
Full Scale Output
Range
7
FSO
–
–
–
–
96
4096
%D
LSB
G (gauss) = 0.1 mT (millitesla).
PWM period is ±15% of the setting determined by the register FPWM address. See EEPROM Customer-Programmable Parameter Reference
for more information.
3
Output pin can be loaded with a 1.2 kΩ pull-up resistor without V
SAT
rising above 0.5 V.
4
Determined from design and lab characterization on a limited number of samples; not tested in production.
5
Clarity of a Read Acknowledge message from the device to the controller will be affected by the amount of capacitance and wire inductance on
the device output. In cases of complex loads with higher capacitance, it is recommended to slow down the communication speed, and to lower the
receiver threshold for reading the digital Manchester signal.
6
See Definitions of Terms section.
7
SENT mode Full Scale Output Range is 12 bit, 0 to 4095.
MAGNETIC CHARACTERISTICS:
Valid through full operating temperature range, T
A
, and supply voltage, V
CC
, C
BYPASS
= 10 nF,
unless otherwise specified
Characteristics
Initial Magnetic Input Signal Range
Initial Magnetic Signal Offset
Initial Sensitivity
Initial Quiescent Output
Initial Output Clamp
OUT
CLP(L)init
SENT
CFG(tick)init
Symbol
B
INinit
B
INOFFSET
Sens
init
Test Conditions
SENS_COARSE = 3
SIG_COARSE = 3
SENS_COARSE = 3, SENS_MULT = 0
B
IN
= 0 G
PWM_MODE = 0 (SENT mode),
CLAMP_HIGH = 0
PWM_MODE = 0 (SENT mode),
CLAMP_LOW = 0
PWM_MODE = 0, SENT_TICK = 2
PWM_MODE = 0, SENT_FIXED = 1
PWM_MODE = 0, SENT_DATA = 3
T
A
= –40°C to 25°C
T
A
= 25°C to 150°C
T
A
= –40°C to 150°C
Min.
–
–
–
–
–
–
0.4
–
–
–
–
–
–
Typ.
±250
0
8.19
50
4095
0
0.5
4
3
3
<±0.03
<±0.02
<±0.005
Max.
–
–
–
–
–
–
0.6
–
–
–
–
–
–
Unit
1,2
G
%FSI
LSB/G
%FSO
LSB
LSB
µs
tick
–
nibble
%/°C
%/°C
%/°C
INITIAL DEVICE VALUES (Before Customer Programming), V
CC
= 5 V, T
A
= 25°C
QOUT
init
OUT
CLP(H)init
Initial SENT Output Configuration
SENT
CFG(fixed)init
SENT
CFG(data)init
SENT
CFG(update)init
PWM_MODE = 0, SENT_UPDATE = 3
Initial Sensitivity Drift Over
Temperature
3,4
Initial Offset (QVO) Drift Over
Temperature
4
1
1
2
FSO
D
Sens
init
DOUT
(Q)init
G (gauss) = 0.1 mT (millitesla).
means Full Scale Output. See Definitions of Terms section.
3
Does not include drift over lifetime and package hysteresis. Sensitivity can drift 3% typical worse case over the life of the product. Package
hysteresis can result in Sensitivity drift of 2% typical worse case.
4
Offset and Sensitivity drifts with temperature changes may vary with adjustment to the initial Magnetic Input Signal Range and Magnetic Offset.
Contact Allegro for more information on application requirements with alternative SENS_COARSE and SIG_OFFSET settings.
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
5
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