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PDF A1334 Data sheet ( Hoja de datos )
| Número de pieza | A1334 | |
| Descripción | Micro Power Hall-Effect Angle Sensor IC | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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A1334
Precision, Micro Power Hall-Effect Angle Sensor IC
FEATURES AND BENEFITS
• Contactless 0° to 360° angle sensor IC, for angular
position, rotational speed, and direction measurement
• Available with either a single die or dual independent die
housed within a single package
• Circular Vertical Hall (CVH) technology provides a
single channel sensor system, with air gap independence
• 12-bit resolution possible in low RPM mode, 10-bit
resolution in high RPM mode
• Angle Refresh Rate (output rate) configurable between
25 and 3200 µs through EEPROM programming
• Capable of sensing magnet rotational speeds in excess of
7600 rpm
• SPI interface allows use of multiple independent sensors
for applications requiring redundancy
• EEPROM programmable angle reference (0°) position
and rotation direction (CW or CCW)
• Absolute maximum VCC of 26.5 V for automotive
battery-powered applications
Packages:
Not to scale
DESCRIPTION
The A1334 is a 360° angle sensor IC that provides contactless
high resolution angular position information based on magnetic
Circular Vertical Hall (CVH) technology. It has a system-on-
chip (SoC) architecture that includes: a CVH front end, digital
signal processing, and a digital (SPI) output. The A1334 is
ideal for automotive applications requiring high speed 0° to
360° angle measurements, such as electronic power steering
(EPS) and throttle systems.
The A1334 supports a Low RPM mode for slower rate appli
cations and a High RPM mode for high speed applications.
High RPM mode is for applications that require higher refresh
rates to minimize error due to latency. Low RPM mode is for
applications that require higher resolution operating at lower
angular velocities.
As part of its signal processing functions, the A1334 includes
automotive grade temperature compensation to provide accurate
output over the full operating temperature and voltage ranges.
TheA1334 also includes EEPROM technology for end-of-line
calibration.
The A1334 is available as a single die in a 14-pin TSSOP, or
dual die in a 24-pin TSSOP. Both packages are lead (Pb) free
with 100% matte-tin leadframe plating.
Single SoC
14-pin TSSOP (LE package)
Dual Independent SoCs
24-pin TSSOP (LE package)
BYP(1)
VCC(1)
(Programming)
Multisegment
CVH Element
BIAS(1)
MISO(1)
CS(1)
MOSI(1)
SCLK(1)
GND(1)
EEPROM
Calibration
Parameters
SPI
Interface
To all internal circuits
SoC die 1
Analog Front End
Bandpass
Filter
ADC
Diagnostics
Digital Processing
Data
Registers
Temperature
Compensation
Internal Calibration
Zero Angle
xxx2
SoC die 2 (optional)
Pin number parentheses refer to chip in dual SoC variant
A1334 Functional Block Diagram
A1334A-DS
Control unit
Steering
sensor
Rack
Motor
A1334 in Electronic Power Steering (EPS)
Application
1 page  
A1334
Precision, Micro Power Hall-Effect Angle Sensor IC
OPERATING CHARACTERISTICS (continued): valid over the full operating voltage and ambient temperature ranges; un-
less otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.1
Max.
Unit2
Angle Characteristics (continued)
Angle Error14
ERRANG
TA = 25°C, ideal magnet alignment, B = 300
G, target rpm = 0
TA = 150°C, ideal magnet alignment, B =
300 G, target rpm = 0
–
–1.75
±0.6
–
–
1.75
deg.
deg
Angle Noise15
TA = 25°C, B = 300 G, no internal filtering – 0.6 – deg.
NANG
TA = 150°C, no internal filtering, B = 300 G,
target rpm = 0
–
0.8
– deg.
Temperature Drift
ANGLEDRIFT
TA = -40°C, B = 300 G
TA = 150°C, B = 300 G
– ±1.5 – deg.
–1.5 – –1.5 deg.
Angle Drift over Lifetime16
ANGLEDRIFT- B = 300 G, typical maximum drift observed
LIFE after AEC-Q100 qualification testing
–
±1.0
–
deg
1 Typical data is at TA = 25°C and VCC = 5 V, and it is for design estimates only.
2 1 G (gauss) = 0.1 mT (millitesla).
3 At power-on, a die will not respond to commands until VCC rises above VUVLOHI. After that, the die will perform and respond normally until VCC drops below VUVLOLOW .
4 Characterization data shows negligible accuracy degradation at supply voltages between 4.35 V and 4.50 V. Significant degradation in accuracy may occur below 4.30 V.
5 VCC Low Threshold Flag will be sent via the SPI interface as part of the angle measurement.
6 During the power-on phase, the A1334 SPI transactions are not guaranteed.
7 Each die includes a linear regulator. The output voltage and current specifications are to aid in PCB design. The pin is not intended to drive any external circuitry.
8 Parameter is not guaranteed at final test. Values for this characteristic are determined by design.
9 The A1334 operates in magnetic fields lower than 300 G, but with reduced accuracy and resolution.
10 RESANGLE represents the number of bits of data available for reading from the die registers.
11 Effective Resolution is calculated using the formula below:
( S )32
log2 (360) - log2 3 X sl
l=1
where σ is the Standard Deviation based on thirty measurements taken at each of the 32 angular positions, I = 11.25, 22.5, … 360.
12 The rate at which a new angle reading will be ready.
13 To calculate Low RPM mode, time = 300 µs + 25 × 2AVG. Given AVG = 011 = 3 (decimal), so 23 = 8.
14 In general, Allegro’s angle sensor ICs are more accurate when stronger magnetic fields (i.e. 900 G) are used. Please contact Allegro for information regarding how users
can realize higher accuracy performance from Allegro’s angle sensor ICs by using stronger applications magnetic fields.
15 Value reflects 3 standard deviations.
16 After qualification testing, a typical IC drifted less than 0.5 degrees; however, after certain long duration stresses (for example 1000 cycles of -65 to 175 degree C tem-
perature cycling), a small number of devices drifted by approximately 1 degree.
Angle (º)
Applied Magnetic Field
Transducer Output
50
Response Time, tRESPONSE
0
t
Definition of Response Time
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A1334
Precision, Micro Power Hall-Effect Angle Sensor IC
dAXIAL1
dAXIAL2
Example of equal eccentricity:
Target rotation axis
centered between both dies
Example of unequal eccentricity:
Target rotation axis centered
over primary die (either die
may be used as primary)
d = 0AXIAL1
dAXIAL2
Target counterclockwise
rotation
Target rotation axis
Target clockwise rotation
Eccentricity of secondary die
(measured from target
rotation axis intersect,
to secondary die)
Figure 4: Demonstration of Magnet to Sensing Element Eccentricity
(dual die version used as example)
Angle Error vs Eccentricity
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0 0.25 0.5 0.75 1 1.25 1.5 1.75
Eccentricity (mm)
Figure 5: Characteristic Performance Based on 14 Pieces
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
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| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet A1334.PDF ] | |
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