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AS5048B Datasheet

(AS5048A/B) Magnetic Rotary Encoder


AS5048B Datasheet Preview


AS5048A/AS5048B
Magnetic Rotary Encoder
14-bit Angular Position Sensor
Datasheet
General Description
The AS5048 is an easy to use 360° angle position sensor with a 14-bit high resolution output. The maximum system
accuracy is 0.05° assuming linearization and averaging is done by the external microcontroller.
The IC measures the absolute position of the magnet’s rotation angle and consists of Hall sensors, analog digital
converter and digital signal processing. The zero position can be programmed via SPI or I²C command. Therefore no
programmer is needed anymore. This simplifies the assembly of the complete system because the zero position of
the magnet does not need to be mechanically aligned. This helps developers to shorten their developing time. The
sensor tolerates misalignment, air gap variations, temperature variations and as well external magnetic fields. This
robustness and wide temperature range (-40°C up to +150°C) of the AS5048 makes the IC ideal for rotation angle
sensing in harsh industrial and medical environments. Several AS5048www.DataSheet.co.kr ICs can be connected in daisy chain for serial
data read out. The absolute position information of the magnet is directly accessible over a PWM output and can be
read out over a standard SPI or a high speed I²C interface. Version AS5048A comes with SPI and PWM Interface.
Version AS5048B is configured with the I²C interface and has also a PWM output. An internal voltage regulator
allows the AS5048 to operate at either 3.3 V or 5 V supplies.
Key Features & Benefits
360° contactless angle position sensor
Standard SPI or high speed I²C interface and PWM
Simple programmable zero position via SPI or I²C
command
No programmer needed
14-bit full scale resolution
0.0219°/LSB
Angle accuracy 0.05°after system linearization and
averaging
Daisy chain capability
Tolerant to air gap variations
magnetic field input range: 30mT – 70mT
-40°C to +150°C ambient temperature range
3.3V / 5V compliant
14-pin TSSOP package (5x6.4mm)
Applications
Robotic joint position detection
Industrial motor position control
Medical robots and fitness equipment
Block Diagram
Revision 1.1
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AS5048A/AS5048B
Magnetic Rotary Encoder
14-bit Angular Position Sensor
Datasheet
Contents
GENERAL DESCRIPTION .................................................................................................................. 1
KEY FEATURES & BENEFITS.................................................................................................................. 1
APPLICATIONS ..................................................................................................................................... 1
BLOCK DIAGRAM ................................................................................................................................. 1
1 PIN CONFIGURATION ................................................................................................................. 4
1.1 PIN DESCRIPTION ........................................................................................................................ 4
2 ELECTRICAL CHARACTERISTICS ............................................................................................ 5
2.1 ABSOLUTE MAXIMUM RATINGS.................................................................................................... 5
2.2 OPERATING CONDITIONS ............................................................................................................. 6
2.3 DC/AC CHARACTERISTICS FOR DIGITAL INPUTS AND OUTPUTS ....................................................... 6
2.4 ELECTRICAL SYSTEM SPECIFICATIONS .......................................................................................... 7
2.5 GLOBAL TIMING CONDITIONS ...................................................................................................... 7
3 FUNCTIONAL DESCRIPTION...................................................................................................... 8
4 OPERATION ............................................................www.DataSheet.co.kr ...................................................................... 8
4.1 SPI INTERFACE ........................................................................................................................... 9
4.1.1 SPI Interface Signals (4-Wire Mode, Wire_mode = 1)............................................................ 9
4.1.2 SPI Timing ......................................................................................................................... 10
4.1.3 SPI Connection to the Host UC ........................................................................................... 11
4.1.4 SPI Communication Command Package .............................................................................. 12
4.1.5 Read Package (Value Read from AS5048A) ......................................................................... 13
4.1.6 Write Data Package (Value Written to AS5048A)................................................................. 13
4.1.7 Register Map SPI ............................................................................................................... 14
4.1.8 SPI Interface Commands .................................................................................................... 15
4.2 I²C INTERFACE .......................................................................................................................... 18
4.2.1 I²C Electrical Specification ................................................................................................ 18
4.2.2 I²C Timing ......................................................................................................................... 19
4.2.3 Register Table .................................................................................................................... 20
4.3 PWM INTERFACE ...................................................................................................................... 21
5 PACKAGE DRAWINGS AND MARKINGS ................................................................................. 22
5.1.1 Assembly Lot Code ............................................................................................................. 22
6 APPLICATION INFORMATION ................................................................................................. 24
6.1 PROGRAMMING OF THE AS5048 ................................................................................................. 24
6.1.1 Programming of the zero position ....................................................................................... 24
6.1.2 Programming sequence with verification............................................................................. 24
6.2 DIAGNOSTIC FUNCTIONS OF THE AS5048 .................................................................................... 24
6.3 CHOOSING THE PROPER MAGNET ............................................................................................... 25
6.4 PHYSICAL PLACEMENT OF THE MAGNET ..................................................................................... 26
Revision 1.1
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AS5048A/AS5048B
Magnetic Rotary Encoder
14-bit Angular Position Sensor
Datasheet
6.5 MAGNET PLACEMENT ................................................................................................................ 26
7 ORDERING INFORMATION ...................................................................................................... 27
8 REVISION HISTORY .................................................................................................................. 27
9 COPYRIGHTS.............................................................................................................................. 28
10 DISCLAIMER .............................................................................................................................. 28
List of Figures
FIGURE 1: PIN CONFIGURATION TSSOP14................................................................................................. 4
FIGURE 2: CONNECTIONS FOR 5V AND 3.3V SUPPLY VOLTAGES .................................................................. 8
FIGURE 3 SPI CONNECTION AS5048A WITH UC ........................................................................................ 9
FIGURE 4 SPI COMMAND/RESPONSE DATA FLOW ...................................................................................... 9
FIGURE 5 SPI TIMING DIAGRAM............................................................................................................. 10
FIGURE 6 SINGLE SLAVE MODE.............................................................................................................. 11
FIGURE 7 MULTIPLE SLAVE, N+3 WIRE (SEPARATE CHIPSELECT) ............................................................. 11
FIGURE 8 DAISY CHAIN, 4 WIRE ............................................................................................................ 12
FIGURE 9 READ COMMAND................................................................................................................... 15
FIGURE 10 WRITE COMMAND ............................................................................................................... 15
FIGURE 11 CLEAR ERROR FLAG COMMAND ........................................................................................ 16
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FIGURE 12 NOP COMMAND ................................................................................................................... 17
FIGURE 13 PWM FORMAT...................................................................................................................... 21
FIGURE 14 PACKAGE MARKING .............................................................................................................. 22
FIGURE 15: TYPICAL MAGNET (6X3MM) AND MAGNETIC FIELD DISTRIBUTION ............................................ 25
FIGURE 16: DEFINED CHIP CENTER AND MAGNET DISPLACEMENT RADIUS .................................................. 26
FIGURE 17: VERTICAL PLACEMENT OF THE MAGNET................................................................................. 26
List of Tables
TABLE 1: PIN DESCRIPTION TSSOP14....................................................................................................... 4
TABLE 2 ABSOLUTE MAXIMUM RATINGS .................................................................................................. 5
TABLE 3: OPERATING CONDITION............................................................................................................. 6
TABLE 4:DC/AC CHARACTERISTICS ......................................................................................................... 6
TABLE 5 SYSTEM SPECIFICATION.............................................................................................................. 7
TABLE 6 GLOBAL TIMING CONDITIONS ...................................................................................................... 7
TABLE 7 SPI TIMING CHARACTERISTICS ................................................................................................. 10
TABLE 8 SPI COMMAND PACKAGE ......................................................................................................... 12
TABLE 9 SPI READ PACKAGE.................................................................................................................. 13
TABLE 10 SPI WRITE DATA PACKAGE...................................................................................................... 13
TABLE 11 SPI REGISTER MAP ................................................................................................................. 14
TABLE 12 CLEAR ERROR FLAG COMMAND .............................................................................................. 16
TABLE 13 NOP COMMAND..................................................................................................................... 17
TABLE 14 I²C ELECTICAL SPECIFICATION ............................................................................................... 18
Revision 1.1
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Part Number AS5048B
Manufactur austriamicrosystems
Description (AS5048A/B) Magnetic Rotary Encoder
Total Page 28 Pages
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