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2024年5月11日发(作者：承星儿)

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 AS5048 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 Applications

• Robotic joint position detection

• Industrial motor position control

• Medical robots and fitness equipment

• 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)

Block Diagram

Revision 1.1 Page 1 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

Contents

GENERAL DESCRIPTION .................................................................................................................. 1

EATURES

ENEFITS

.................................................................................................................. 1

PPLICATIONS

..................................................................................................................................... 1

LOCK

IAGRAM

................................................................................................................................. 1

PIN CONFIGURATION ................................................................................................................. 4

1.1

ESCRIPTION

........................................................................................................................ 4

ELECTRICAL CHARACTERISTICS ............................................................................................ 5

2.1

2.2

2.3

2.4

2.5

BSOLUTE

AXIMUM

ATINGS

.................................................................................................... 5

PERATING

ONDITIONS

............................................................................................................. 6

DC/AC

HARACTERISTICS FOR DIGITAL INPUTS AND OUTPUTS

....................................................... 6

LECTRICAL

YSTEM

PECIFICATIONS

.......................................................................................... 7

LOBAL

IMING

ONDITIONS

...................................................................................................... 7

FUNCTIONAL DESCRIPTION ...................................................................................................... 8

OPERATION .................................................................................................................................. 8

4.1

SPI

NTERFACE

........................................................................................................................... 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

PACKAGE DRAWINGS AND MARKINGS ................................................................................. 22

5.1.1

Assembly Lot Code ............................................................................................................. 22

APPLICATION INFORMATION ................................................................................................. 24

6.1

ROGRAMMING OF THE

AS5048 ................................................................................................. 24

6.1.1

Programming of the zero position ....................................................................................... 24

6.1.2

Programming sequence with verification ............................................................................. 24

6.2

IAGNOSTIC FUNCTIONS OF THE

AS5048 .................................................................................... 24

6.3

HOOSING THE

ROPER

AGNET

............................................................................................... 25

6.4

HYSICAL

LACEMENT OF THE

AGNET

..................................................................................... 26

Revision 1.1 Page 2 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

6.5

Datasheet

AGNET

LACEMENT

................................................................................................................ 26

ORDERING INFORMATION ...................................................................................................... 27

REVISION HISTORY .................................................................................................................. 27

COPYRIGHTS .............................................................................................................................. 28

DISCLAIMER .............................................................................................................................. 28

List of Figures

IGURE

IN CONFIGURATION

TSSOP14 ................................................................................................. 4

IGURE

ONNECTIONS FOR

AND

3.3V

SUPPLY VOLTAGES

.................................................................. 8

IGURE

SPI

ONNECTION

AS5048A

WITH U

C ........................................................................................ 9

IGURE

SPI

OMMAND

ESPONSE

ATA

LOW

...................................................................................... 9

IGURE

SPI

IMING

IAGRAM

............................................................................................................. 10

IGURE

INGLE

LAVE

ODE

.............................................................................................................. 11

IGURE

ULTIPLE

LAVE

IRE

EPARATE

HIP

ELECT

) ............................................................. 11

IGURE

AISY

HAIN

IRE

............................................................................................................ 12

IGURE

READ

OMMAND

................................................................................................................... 15

IGURE

WRITE

OMMAND

............................................................................................................... 15

IGURE

CLEAR

ERROR

FLAG

OMMAND

........................................................................................ 16

IGURE

NOP

OMMAND

................................................................................................................... 17

IGURE

PWM

ORMAT

...................................................................................................................... 21

IGURE

ACKAGE

ARKING

.............................................................................................................. 22

IGURE

15:

YPICAL MAGNET

)

AND MAGNETIC FIELD DISTRIBUTION

............................................ 25

IGURE

16:

EFINED CHIP CENTER AND MAGNET DISPLACEMENT RADIUS

.................................................. 26

IGURE

17:

ERTICAL PLACEMENT OF THE MAGNET

................................................................................. 26

List of Tables

ABLE

IN DESCRIPTION

TSSOP14 ....................................................................................................... 4

ABLE

BSOLUTE

AXIMUM

ATINGS

.................................................................................................. 5

ABLE

PERATING

ONDITION

............................................................................................................. 6

ABLE

4:DC/AC

CHARACTERISTICS

......................................................................................................... 6

ABLE

YSTEM SPECIFICATION

.............................................................................................................. 7

ABLE

LOBAL TIMING CONDITIONS

...................................................................................................... 7

ABLE

SPI

IMING

HARACTERISTICS

................................................................................................. 10

ABLE

SPI

OMMAND

ACKAGE

......................................................................................................... 12

ABLE

SPI

READ PACKAGE

.................................................................................................................. 13

ABLE

SPI

WRITE DATA PACKAGE

...................................................................................................... 13

ABLE

SPI

................................................................................................................. 14

ABLE

LEAR

RROR

LAG

OMMAND

.............................................................................................. 16

ABLE

NOP

OMMAND

..................................................................................................................... 17

ABLE

I²C

LECTICAL

PECIFICATION

............................................................................................... 18

Revision 1.1 Page 3 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

ABLE

I²C

IMING

............................................................................................................................ 19

ABLE

EGISTER

I2C ................................................................................................................ 20

ABLE

PWM

ERIOD AND RESOLUTION

.............................................................................................. 21

ABLE

18:

RDERING

NFORMATION

...................................................................................................... 27

1 Pin Configuration

SDA/CSn

114

PWM

SCL/CLK

A2/MISO

A1/MOSI

TEST

AS5048

GND

VDD3V

VDD5V

TEST

Figure 1: Pin configuration TSSOP14

1.1 Pin Description

Pin Symbol Type Description

1 SDA/CSn DI_ST SPI chip select - active low; shared with I2C

chip select pin

2 SCL/CLK DI_ST SPI clock input; shared with I2C clock input

3 A2/MISO DIO_ST SPI master in/slave out; shared with I2C

address selection pin 2

4 A1/MOSI DI_ST SPI master out/slave in; shared with I2C

address selection pin 1

5 TEST AIO Test pin, see Note

6 TEST AIO Test pin, see Note

7 TEST AIO Test pin, see Note

8 TEST AIO Test pin, see Note

9 TEST AIO Test pin, see Note

10 TEST AIO Test pin, see Note

11 VDD5V S Positive Supply Voltage, 3.0 to 5.5 V

12 VDD3V S

3.3V Regulator output; internally regulated from

VDD. Connect to VDD for 3V supply voltage.

10uF capacitor to GND required in 5V operation

mode

13 GND S Negative Supply Voltage (GND)

14 PWM DO Pulse Width Modulation output

Table 1: Pin description TSSOP14

PIN Types: S ... supply pad

AIO ... analog I/O

DI_ST … digital input with schmitt trigger

DO ... digital output – push-pull

DIO _ST ... digital I/O with schmitt trigger in the input path

Note: Pin 5 should be grounded to VSS. Pins 6, 7, 8, 9, 10 should be left open during the normal operation.

Revision 1.1

Page 4 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

Electrical Characteristics

2.1 Absolute Maximum Ratings

Stresses beyond those listed under “Absolute Maximum Ratings“ may cause permanent damage to the device. These are stress ratings only. Functional operation of

the device at these or any other conditions beyond those indicated under “Operating Conditions” is not implied. Exposure to absolute maximum rating conditions for

extended periods may affect device reliability.

Parameter

DC supply voltage at VDD pin

DC voltage at VDD3V pin

DC voltage at GND pin

Input pin voltage

Input current (latchup immunity)

Electrostatic discharge

Total power dissipation (all supplies and

outputs)

Storage temperature

Symbol

VDD5V

VDD3V

GND

V_in

I_scr

ESD

P_t

T_strg

Min

-0.3

-100

+/-2

-55

Max

0.3

VDD+0.3

100

150

Unit

°C

(1)

Note

Norm: Jedec 78

Norm: MIL 883 E method 3015

The reflow peak soldering

temperature (body

temperature)specified is in

accordance with IPC/JEDEC J-

STD-020 “Moisture Solid State

Surface Mount Devices”. The lead

finish from Pb-free leaded

packages is matte tin (100% Sn)

Represents a maximum floor life

time of 168h

Package body temperature T_body 260 °C

Humidity non-condensing

Moisture Sensitive Level

MSL

85 %

Table 2 Absolute Maximum Ratings

Revision 1.1 Page 5 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

2.2 Operating Conditions

All in this specification defined tolerances for external components need to be assured over the whole operation conditions

range and also over lifetime.

Parameter

Positive supply voltage

Positive core supply voltage

Negative supply voltage

Ambient temperature

Supply Current

Symbol

VDD5V

VDD3V

VDDCORE

GND

T_amb

I_sup

Min

4.5

-40

Max

5.5

3.6

150

Unit

°C

Note

5V Operation via LDO

LDO output voltage

Only for 5V operation.

T_amb_max for 3V is 125°C

Table 3: Operating Condition

2.3 DC/AC Characteristics for digital inputs and outputs

Parameter Symbol Min

CMOS digital input with schmitt trigger: CSn, CLK, MOSI

High level input voltage V_IH 0.7 * VDD5V

Low level input voltage

Input leakage current

CMOS output: PWM, MISO

High level output voltage

Low level output voltage

Capacitive load

Output current

V_IL

l_LEAK

V_OH

V_OL

C_L

I_OUT

VDD5V-0.5

Typ

Max

0.3 * VDD5V

GND+0.4

Unit

µA

Note

Table 4:DC/AC characteristics

Revision 1.1 Page 6 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

2.4 Electrical System Specifications

VDD5V = 5V, T

Ambient

= -40 to +150°C unless noted otherwise

Parameter

Magnetic input field

Output sampling rate

Output Resolution

Sensor output noise

System propagation delay

PWM frequency

Non-linearity optimum placement of

magnet

Non-linearity @displacement of

magnet

Non-linearity @displacement of

magnet and temperature -40 -150

degC

Symbol

sample

RES

Noise

prop

PWM

INL

OPT

Min

10.2

Typ

11.25

Max

12.4

Unit

kHz

Bit

Note

90.7

0.907

100

0.06

110.2

1.102

±0.4

Deg

µs

kHz

Deg

2.73LSB@14bit, rms

value

Assuming 8 mm

diameter of magnet

Assuming 8 mm

diameter of magnet and

500 um displacement in

x and y

Assuming 8 mm

diameter of magnet and

500 um displacement in

x and y

INL

DIS

±0.7 Deg

INL

DIS+TEMP

±1.2 Deg

Table 5 System specification

2.5 Global Timing Conditions

Parameter

Internal Master Clock

Symbol

OSC

Min

4.05

Typ

4.5

1/F

OSC

Table 6 Global timing conditions

Max

4.95

Unit

Note

MHz ±10%

Revision 1.1 Page 7 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

Functional Description

The AS5048 is a magnetic Hall sensor system manufactured in a CMOS process. A lateral Hall sensor array is used to measure

the magnetic field components perpendicular to the surface of the chip. The AS5048 is uses self-calibration methods to

eliminate signal offset and sensitivity drifts.

The integrated Hall sensors are placed around the center of the device and deliver a voltage representation of the magnetic flux

Bz.

Through Sigma-Delta Analog-to-Digital Converter (ADC) and Digital Signal-Processing (DSP) algorithms, the AS5048 provides

accurate high-resolution absolute angular position information. This is accomplished by a Coordinate Rotation Digital Computer

(CORDIC) calculates the angle and the magnitude of the Hall array signals.

The DSP is also used to provide digital information at the outputs that indicate movements of the magnet towards or away from

the device’s surface, in the z-axis.

A small diametrically magnetized (two-pole) standard magnet provides the angular position information. Depending on the

system requirements different magnet diameters are possible. Additional flexibility is given by the wide range of the magnetic

input range. The AS5048 can be combined with NeFeB, SmCo and alternative magnet hard ferrites. The AS5048

provides a 14-bit binary code representing the angular position of the magnet. The type of output is pre-programmed as SPI

version A or I2C version B. Simultaneously a PWM output signal is available in 12 bit format.

A simple programming of the zero position is possible over the interface. No additional programmer is needed. The AS5048

uses one time programmable (OTP) fuses for permanent programming of the user settings. The verification is possible over a

simple digital readout of the OTP content.

4 Operation

The AS5048 operates at 5V ±10%, using an internal Low-Dropout (LDO) voltage regulator. In addition a 3.3V operation is

possible. The VDD3V output is intended for internal use only. It must not be loaded with an external load.

5V Operation

10F

3.3V Operation

VDD3V

10uF

1uF

VDD5V

LDO

Internal

VDD3.3V

VDD5V

LDO

Internal

VDD3.3V

4.5 -5.5V

3.0-3.6V

GND

Figure 2: Connections for 5V and 3.3V supply voltages

Note: The pin VDD3V must always be buffered by a 10 µF capacitor in 5V operation. It must not be left floating, as this may

cause unstable internal supply voltages which may lead to larger output jitter of the measured angle.

In 3V operation the VDD3V must be shorted to VDD5V.

Revision 1.1 Page 8 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

Datasheet

4.1 SPI Interface

The 16 bit SPI Interface enables read / write access to the register blocks and is compatible to a standard micro controller

interface. The SPI is active as soon as CSn is pulled low. The AS5048A then reads the digital value on the MOSI(master out

slave in) input with every falling edge of CLK and writes on its MISO (master in slave out) output with the rising edge. After 16

clock cycles CSn has to be set back to a high status in order to reset some parts of the interface core.

4.1.1 SPI Interface Signals (4-Wire Mode, Wire_mode = 1)

The AS5048A only supports slave operation mode. Therefore CLK for the communication as well as the CSn signal has to be

provided by the test equipment. The following picture shows a basic interconnection diagram with one master and an AS5048A

device and a principle schematic of the interface core.

Figure 4 SPI Command/Response Data Flow

Revision 1.1 Page 9 of 28

AS5048A/AS5048B

Magnetic Rotary Encoder

14-bit Angular Position Sensor

4.1.2 SPI Timing

Datasheet

CSn

(Input)

CLK

(Input)

clk

clkL

clkH

MISO

(Output)

data[15]data[14]data[0]

MOSI

(Input)

data[15]data[14]data[0]

Figure 5 SPI Timing Diagram

Parameter

CLK

CLKL

CLKH

CSnH

MOSI

MISO

Description

Time between CSn falling edge and CLK rising edge

Serial clock period

Low period of serial clock

High period of serial clock

Time between last falling edge of CLK and rising edge of CSn

High time of CSn between two transmissions

Data input valid to clock edge

CLK edge to data output valid

Table 7 SPI Timing Characteristics

Min

10 (2)

350 (1)

100

SCK

/ 2

10 (2)

350 (1)

Max

Unit

Notes:

(1)

Synchronization with the internal clock