AS5048A-HTSP [AMSCO]
Magnetic Rotary Encoder 14-bit Angular Position Sensor; 磁旋转编码器的14位角位置传感器
| 型号： | AS5048A-HTSP |
| 厂家： | 
AMS(艾迈斯) |
| 描述： | Magnetic Rotary Encoder 14-bit Angular Position Sensor |
| 文件： | 总30页 (文件大小：2680K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
General Description
The AS5048 is an easy to use 360° angle position sensor with a 14ꢀbit high resolution utputThe maximum system
accuracy is 0.05° assuming linearization and averaging ine by the external microcontroller.
The IC measures the absolute position of the magnet’s ron angle and conts of Hall sensors, analog digital
converter and digital signal processing. The zero position cbe programmed via SI or I²C command. Therefore no
programmer is needed anymore. This simplifies the assembly of the complete sstem because the zero position of
the magnet does not need to be mechanically algned. This helps developerto shorten their developing time. The
sensor tolerates misalignment, air gap variations, temerature variatiand as well external magnetic fields. This
robustness and wide temperature range (ꢀ4°C up to +150°C) othe 508 makes the IC ideal for rotation angle
sensing in harsh industrial and medical evirnments. Several AS508 ICs can be connected in daisy chain for serial
data read out. The absolute position infomation of the magnet idirectly accessible over a PWM output and can be
read out over a standard SPI or a hispeed I²C interface. S5048A has a SPI interface, AS5048B I2C interface.
Both devices offer a PWM output. Aernal voltage reator allows the AS5048 to operate at either 3.3 V or 5 V
supplies.
Key Features & Benefits
Applications
•
•
•
•
360° contactless angle position sensor
Standard SPI or high speed I²C interface
Pulse width modulated output (PWM)
Simple programmable zero posiion via SPI or I²C
command
•
•
•
Robotic joint position detection
Industrial motor position control
Medical robots and fitness equipment
Block Diagram
•
•
No programmer needed
14ꢀbit full scale resoluion
0.0219°/LSB
•
Angle accura0.05after system linearization and
averaging
•
•
Daisy cain cpability
Tnt to air gap variations
mnetc field input range: 30mT – 70mT
ꢀ40°C to +150°C ambient temperature range
3.3V / 5V compliant
•
•
14ꢀpin TSSOP package (5x6.4mm)
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
Contents
GENERAL DESCRIPTION .................................................................................................................. 1
KEY FEATURES & BENEFITS.................................................................................................................. 1
APPLICATIONS .................................................................................................................................... 1
BLOCK DIAGRAM ............................................................................................................................... 1
1
2
PIN CONFIGURATION ................................................................................................................ 5
1.1 PIN DESCRIPTION ..................................................................................................................... 5
ELECTRICAL CHARACTERISTICS ........................................................................................ 6
2.1 ABSOLUTE MAXIMUM RATINGS............................................................................................... 6
2.2 OPERATING CONDITIONS .......................................................................................................... 7
2.3 DC/AC CHARACTERISTICS FOR DIGITAL INPUTOUTPUTS ..................................................... 7
2.4 ELECTRICAL SYSTEM SPECIFICATIONS ..................................................................................... 8
2.5 GLOBAL TIMING CONDITIONS .................................................................................................. 8
3
4
FUNCTIONAL DESCRIPTION............................................................................................... 9
OPERATION ............................................................................................................................ 9
4.1 SUPPLY VOLTAGE CONFIGRATON ........................................................................................... 9
4.2 SPI INTERFACE .................................................................................................................. 10
4.2.1 SPI Interface Signals (4-Wire Mode, Wode = 1).......................................................... 10
4.2.2 SPI Timing ........................................................................................................................ 11
4.2.3 SPI Connection to the Host UC ....................................................................................... 12
4.2.4 SPI Communication Commnd Package .............................................................................. 13
4.2.5 Read Package (Value Read from AS5048A) ......................................................................... 14
4.2.6 Write Data Package (ValWritten to AS5048A)................................................................. 14
4.2.7 Register Map SPI .............................................................................................................. 15
4.2.8 SPI Interface Comans .................................................................................................... 16
4.3 I²C INTERFACE ........................................................................................................................ 19
4.3.1 I²C Electcal Specification ................................................................................................ 19
4.3.2 I²C Tmng ........................................................................................................................ 20
4.3.3 Regiter Table.................................................................................................................... 21
4.3.4 I²C Slave address ............................................................................................................... 22
4.4 PWITERFACE ...................................................................................................................... 22
6
PAKAGE DRAWINGS AND MARKINGS ................................................................................. 23
5.1.1 Assembly Lot Code ............................................................................................................. 23
APPLICATION INFORMATION ................................................................................................. 25
6.1 PROGRAMMING OF THE AS5048 ................................................................................................. 25
6.1.1 Programming of the zero position ....................................................................................... 25
6.1.2 Programming sequence with verification............................................................................. 25
6.2 DIAGNOSTIC FUNCTIONS OF THE AS5048 .................................................................................... 25
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
6.3 CHOOSING THE PROPER MAGNET ............................................................................................... 26
6.4 PHYSICAL PLACEMENT OF THE MAGNET ..................................................................................... 27
6.5 MAGNET PLACEMENT ................................................................................................................ 27
7
8
9
ORDERING INFORMATION ...................................................................................................... 28
REVISION HISTORY .................................................................................................................. 28
COPYRIGHTS.............................................................................................................................. 2
10 DISCLAIMER ............................................................................................................................29
List of Figures
FIGURE 1: PIN CONFIGURATION TSSOP14............................................................................................. 5
FIGURE 2: CONNECTIONS FOR 5V AND 3.3V SUPPLY VOLTAGES ............................................................. 9
FIGURE 3 SPI CONNECTION AS5048A WITH UC ............................................................................... 10
FIGURE 4 SPI COMMAND/RESPONSE DATA FLOW .............................................................................. 10
FIGURE 5 SPI TIMING DIAGRAM...................................................................................................... 11
FIGURE 6 SINGLE SLAVE MODE......................................................................................................... 12
FIGURE 7 MULTIPLE SLAVE, N+3 WIRE (SEPARATE CHIPSELECT) ............................................................ 12
FIGURE 8 DAISY CHAIN, 4 WIRE ...................................................................................................... 13
FIGURE 9 READ COMMAND ........................................................................................................... 16
FIGURE 10 WRITE COMMAND ......................................................................................................... 16
FIGURE 11 CLEAR ERROR FLAG OMAND .................................................................................... 17
FIGURE 12 NOP COMMAND ...................................................................................................... 18
FIGURE 13 SLAVE ADDRESS CONSTRUCTION ................................................................................... 22
FIGURE 14 PWM FORMAT..................................................................................................................... 23
FIGURE 15 PACKAGE MARKING ........................................................................................................... 23
FIGURE 16: TYPICAL MAGNET AND MAGNTIC FLUX DISTRIBUTION ........................................................... 26
FIGURE 17: DEFINED CHIP CENTER AND MAGNET DISPLACEMENT RADIUS .................................................. 27
FIGURE 18: VERTICAL PLACEMENT OF E MAGNET................................................................................. 27
List of Tables
TABLE 1: PIN DESCRIPTON TSSOP14....................................................................................................... 5
TABLE 2 ABSOTE AXIMUM RATINGS .................................................................................................. 6
TABLE 3: OPERATG CONDITION............................................................................................................. 7
TABLE 4:D/AC CHARACTERISTICS ......................................................................................................... 7
TABLE YSTEM SPECIFICATION .............................................................................................................. 8
ABLE GOBAL TIMING CONDITIONS ...................................................................................................... 8
TBLE 7 SPI TIMING CHARACTERISTICS ................................................................................................. 11
TABLE 8 SPI COMMAND PACKAGE ......................................................................................................... 13
TABLE 9 SPI READ PACKAGE.................................................................................................................. 14
TABLE 10 SPI WRITE DATA PACKAGE...................................................................................................... 14
TABLE 11 SPI REGISTER MAP ................................................................................................................. 15
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
TABLE 12 CLEAR ERROR FLAG COMMAND .............................................................................................. 17
TABLE 13 NOP COMMAND..................................................................................................................... 18
TABLE 14 I²C ELECTICAL SPECIFICATION ............................................................................................... 19
TABLE 15 I²C TIMING ............................................................................................................................ 20
TABLE 16 REGISTER MAP I2C ................................................................................................................ 21
TABLE 17 PWM PERIOD AND RESOLUTION .............................................................................................. 23
TABLE 18: ORDERING INFORMATION ...................................................................................................... 28
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
1
Pin Configuration
Figure 1: Pin configuration TSSOP14
1.1 Pin Description
Pin
AS5048A
Type
Description
AS5048B
Type
Description
1
2
CSn
CLK
DI_ST SPI chip select ꢀ active low
DI_ST SPI clock input
SDA
SCL
A2
O_OD Data pin I2C interface
DI_ST I2C clock input
3
MISO
MOSI
TEST
TEST
TEST
TEST
TEST
TEST
VDD5V
VDD3V
DIO_ST SPI master in/slave out
DI_ST SPI master out/slave in
DI_ST I2C address selection pin 3
DI_ST I2C address selection pin 4
4
1
5
AIO
AIO
AIO
AIO
AIO
AIO
S
Test pin, see No
6
Test pin, see ote
7
Test pn, Note
8
Test pinNote
9
Test pin, see Note
10
11
12
Test pin, see Note
Same as AS5048A
Positive SuppVoltage, 3.0 to 5.5 V
3.3V Regulator ouut; internally regulated
from VDD. Coect to VDD for 3V supply
voltage. 10ꢁpacitor to GND required in
5V operation ode
S
13
14
GND
PWM
S
Neative upply Voltage (GND)
Plse Width Modulation output
DO
Table 1: Pin description TSSOP14
PIN Types:
S
AIO
_ST
DO
DIO _ST
DIO _OD
...
...
…
...
...
...
supply pad
analog I/O
digital input with schmitt trigger
digital output – pushꢀpull
digital I/O with schmitt trigger in the input path
digital I/O with open drain output
te: Pin 5, 6, 7, 8, 9, 10 should be grounded to GND.
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
2
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
Symbol
VDD5V
VDD3V
GND
Min
ꢀ0.3
ꢀ0.3
ꢀ0.3
Max
7
Unit
V
Note
DC supply voltage at VDD pin
DC voltage at VDD3V pin
DC voltage at GND pin
Input pin voltage
5
V
0.3
V
V_in
VDD+3
100
V
Input current (latchup immunity)
Electrostatic discharge
I_scr
ꢀ
mA
kV
Norm: Jedec 78
ESD
+/ꢀ2
Norm: MIL 883 E method 3015
Total power dissipation (all supplies and
outputs)
P_t
150
15
mW
°C
Storage temperature
T_strg
ꢀ55
The reflow peak soldering
temperature (body
temperature)specified is in
accordance with IPC/JEDEC Jꢀ
STDꢀ020 “Moisture Solid State
Surface Mount Devices”. The lead
finish from Pbꢀfree leaded
packages is matte tin (100% Sn)
Package body temperature
T_body
260
85
°C
%
Humidity nonꢀcondensing
Moisture Sensitive Level
H
5
Represents a maximum floor life
time of 168h
MS
3
Table 2 Absolute Maximum Ratings
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
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
Symbol
VDD5V
VDD3V
VDDCORE
GND
Min
4.5
3
Max
5.5
3.6
3.6
0
Unit
V
Note
Positive supply voltage
5V Operation via LDO
LDO output voltage
V
Positive core supply voltage
Negative supply voltage
Ambient temperature
3
V
0
V
T_amb
ꢀ40
150
°C Only for 5V peraton.
T_amb_ax for 3V is 125°C
Supply Current
I_sup
15
mA
Table 3: Operondtion
2.3 DC/AC Characteristics for digital nputs and outputs
Parameter
Symbo
Min
Typ
Max
Unit
Note
CMOS digital input with schmitt trigger: CSnCLK, MOSI
High level input voltage
Low level input voltage
V
V_IL
0.7 * VDD5V
VDD5Vꢀ0.5
V
V
0.3 * VDD5V
1
Input leakage current
l_LEAK
ꢁA
CMOS output: PWM, MISO
High level output voltage
V_OH
V_OL
C_L
V
V
Low level output voltage
Capacitive load
GND+0.4
50
4
pF
mA
Output current
I_OUT
Table 4:DC/AC characteristics
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
2.4 Electrical System Specifications
VDD5V = 5V, TAmbient = ꢀ40 to +150°C unless noted otherwise
Parameter
Symbol
Bz
Min
30
Typ
50
Max
70
Unit
mT
kHz
Bit
Note
Magnetic input field
Output sampling rate
Output Resolution
fsample
RES
10.2
11.25
14
12.4
2.73LSB@1bit, rms
value
Sensor output noise
Noise
0.06
Deg
System propagation delay
PWM frequency
tprop
fPWM
90.7
100
110.2
102
ꢁs
0.907
kHz
Nonꢀlinearity optimum placement of
magnet
Assuming 8 mm
diameter of magnet
INLOPT
±0.4
Deg
Deg
Assuming 8 mm
diameter of magnet and
500 um displacement in
x and y
Nonꢀlinearity @displacement of
magnet
INLDIS
±0.7
Assuming 8 mm
diameter of magnet and
500 um displacement in
x and y
Nonꢀlinearity @displacement of
magnet and temperature ꢀ40 ꢀ150 ILDIS+EMP
degC
±1.2
10
Deg
ms
Startup Time
tstartup
Tae 5 Stem specification
2.5 Global Timing Conditions
Parameter
Symbol
FSC
SC
n
Typ
Max
4.95
Unit
Note
Internal Master Clock
4.05
4.5
1/FOSC
MHz ±10%
Hz
Table 6 Global timing conditions
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
3
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 selfꢀcalibration 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 SigmaꢀDelta AnalogꢀtoꢀDigital Converter (ADC) and Digital SignalꢀProcessing (DSP) algorithms, the AS5048 prvide
accurate highꢀresolution absolute angular position information. This is accomplished by a Coordinate Rotation Digital Comuter
(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 twardor away from
the device’s surface, in the zꢀaxis.
A small diametrically magnetized (twoꢀpole) standard magnet provids the angular position infortion. epending on the
system requirements different magnet diameters are possible. Additinal flexility is given by the wide nge of the magnetic
input range. The AS5048 can be combined with NeFeB, SmCo and alteativmagnet materials e. hrd ferrites. The AS5048
provides a 14ꢀbit binary code representing the angular positihe magnet. The tye of output is preꢀprogrammed as SPI
version A or I2C version B. Simultaneously a PWM output signal vailable in 12 bit forma.
A simple programming of the zero position is possible over the nterface. No addionaprogrammer is needed. The AS5048
uses one time programmable (OTP) fuses for permaent ogramming of the user sttings. The verification is possible over a
simple digital readout of the OTP content.
4
Operation
4.1 Supply Voltage Configuron
The AS5048 operates at 5V ±10%, using an internal Lowꢀt (LDO) voltage regulator. In addition a 3.3V operation is
possible. The VDD3V output is intended for internal usonly. It must not be loaded with an external load.
3.3V Operation
5V Operation
10ꢀF
VDD3V
VDD3V
100nF
10ꢀF
100nF
LDO
LDO
VD5V
VDD5V
Internal
VDD3.3V
Internal
VDD3.3V
3.0 ꢁ 3.6V
GND
4.5 ꢁ 5.5V
GND
Figure 2: Connections for 5V and 3.3V supply voltages
Note: The pin VDD3V must always be buffered by a 10 ꢁF 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. The ambient temperature Tamb is limited to 125 degC in this mode.
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.2 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 1
clock cycles CSn has to be set back to a high status in order to reset some parts of the interface core.
4.2.1
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 gnal as to be
provided by the test equipment. The following picture shows a basic interconnection diagram with one mastr and an AS5048A
device and a principle schematic of the interface core.
Figure 3 SPI ConnAS5048A with uC
Because the interface has to decode the sent commanbefoe it can react and provide data the response of the chip to a
specific command applied at a time T can be cessed in the next transmission cycle ending at T + TCOM.
The data are sent and read with MSB first. Evertime the chip is accessed it is sending and receiving data.
Figure 4 SPI Command/Response Data Flow
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.2.2
SPI Timing
tCSn
CSn
(Input )
tL
tclk
t
clkL
tclkH
tH
CLK
(Input )
tMISO
tOZ
MISO
(Output )
data [15]
data [14]
data[0]
tOZ
tMOSI
MOSI
(Input )
data[15]
data [14]
data [0]
Figure 5 SPI TDram
Parameter
Description
Min
Max
Unit
tL
Time between CSn falling edge nd K rising edge
Time between CSn falling edgand CLK rising edge
Serial clock period
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
10 (2)
350 (1)
100
tL
TCLK
tCLKL
tCLKH
tH
Low period of serial cloc
50
High period of seal ck
50
Time between last fng edge of CLK ing edge of CSn
High time of CSn between two transmisss
High time of CSn between two trnsmisions
Data input valid to clock dge
tCLK / 2
TCSnH
TCSnH
tMOSI
tMISO
10 (2)
350 (1)
20
CLK edge to data output vali
20
Table 7 SPI Timing Characteristics
Notes:
(1) Synchronization with te intnal clock ꢀ 2 * tCLK_SYS + 10 ns (e.g. at 8 MHz ꢀ 253 ns)
(2) No synchronization eedebecause the internal clock is inactive
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.2.3
SPI Connection to the Host UC
Single Slave Mode
Figure 6 Singve Mode
3 Wire Mode (read only):
Multiple Slave, n+3 Wire (Separate ChipSelect)
Figure 7 Multiple Slave, n+3 Wire (Separate ChipSelect)
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
Daisy Chain, 4 Wire
Figure 8 Daisy Cn, 4 We
4.2.4
SPI Communication Commanckage
Every command sent to the AS5048A is represented with the ing layout.
Comand Package
Bit
MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LSB
PAR
RWn
Address<13:0>
Bit Definition & Description
PAR
Parity bit VEN
RWn
Indicateread(1) or write(0) command
bit dress code
Address
Table 8 SPI Command Package
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.2.5
Read Package (Value Read from AS5048A)
The read frame always contains two alarm bits, the parity and error flags and the addressed data of the previous read
command.
Read Package
Bit
MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LS
PAR
EF
Data<13:0>
Bit Definition & Description
PAR
EF
Parity bit (EVEN)
Error flag indicating a transmission error in a previous host transmission
14 bit addressed data
Data
Table 9 SPI read pacage
4.2.6
Write Data Package (Value Written to AS5048A)
The write frame is compatible to the read frame and contains tadditional bits, parity flag and R flag.
If the previous command was a write command a second packags to be transmitted.
Data Package
Bit
MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LSB
PAR
R
Data 3:0
Bit Definition & Description
PAR
R
Parity bit (EVN
Has to be 0
Data
14 bit data to write to former selecteress
Tabl10 SPwrite data package
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.2.7
Register Map SPI
Address
hex
Access
Type
Name
Bit Nr.
Symbol
Default
Description
13
:
x0000
SPI NOP
R
NOP
0
No operation dummy information
0
13
:
3
2
1
not used
n.a.
0
x0001 Clear Error Flag
R
Error Register. All errors are clead by access
Parity Error
Command Invalid
Framing Error
0
13
:
not used
7
6
5
4
3
2
1
0
Prograing ntrol register.
Programming must bnabled before burning the
fuse(s). Aprogramming is a verification mandatory.
e programming procedure.
Verify
not used
Programming
x0003
R/W
0
Control
Burn
eserved
Prmmg Enable
1
8
:
not used
R/W
+
Progra
OTP Register
x0016
Zero Position value high byte
Zero Position Hi
Zero Position <13>
0
:
:
0
Zero Pos
0
13
:
6
5
:
not ued
0
OTP Register
Zero Position
Low 6 LSBs
R/W
+
Program
x0017
Zero Position remaining 6 lower LSB's
Zero Position <5>
0
:
:
Zero Position <0>
0
1
11
10
9
8
7
:
0
13
:
0
13
:
0
not used
n.a.
Comp High
Comp Low
COF
OCF
AGC value<7>
:
AGC value<0>
Magnitude<13>
:
Magnitude<0>
Angle <13>
:
0
0
0
1
1
:
0
0
:
Diagnostics flags
Diagnostics +
x3FFD Automatic Gain
Control (AG
R
Automatic Gain Control value.
0 decimal represents high magnetic field
255 decimal represents low magnetic field
x3FFE
FFF
Mnitude
Angle
R
R
Magnitude information after ATAN calculation
0
0
:
Angle information after ATAN calculation
and zero position adder
Angle<0>
0
Table 11 SPI register map
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.2.8
SPI Interface Commands
READ Command
For a single READ command two transmission sequences are necessary. The first package written to the AS5048 contains the
READ command (MSB-1 high) and the address the chip has to access, the second package transmitted to the AS5048 device
can be any command the chip has to process next. The content of the desired register is available in the MISO register of the
master device at the end of the second transmission cycle.
Figure 9 READ Command
WRITE Command
A single WRITE command takes two transmission cycles. WitOP command after the WRITE command you can verify the
sent data with three transmission cycles because the ata wibe send back during the following command.
Figure 10 WRITE Command
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
CLEAR ERROR FLAG Command
The CLEAR ERROR FLAG command is implemented as READ command. This command clears the ERROR FLAG which is
contained in every READ frame. Before the ERROR FLAG is cleared the error register content comes back with the information
which error type was occurred. On the next new READ register the ERROR FLAG is cleared
Figure 11 LEAR ERROR FLAG Command
The package necessary to perform a CLEAR EROR FLAG is built up as follows.
CLEAR ERROR FLAG Command
Bit MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LSB
PAR
1
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Table 12 Clear Error Flag Command
Possible conditions which orce the ERROR FLAG to be set:
ꢁ
ꢁ
wrong pari
wrong number of clocks (no full transmission cycle or too many clocks)
Note: Ierror flag is set to high because of a communication problem the flag remains set until it will be cleared by the
LERAR ERROR FLAG command.
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
NOP Command
The NOP command represents a dummy write to the AS5048.
Figure 12 NOP ommand
The NOP command frame looks like follo
Nmmand
Bit MSB
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LSB
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Table 13 NOP Command
The chip’s response on this command is 0x0– if no error happens.
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.3 I²C interface
The AS5048B supports 2ꢀwire highꢀspeed I²C protocol in device mode. The host MCU (master) has to initiate the data
transfers. The 7ꢀbit device address of the slave depends on the state of the OTP I2C register 21 (0x15) bit 0…4 + 2 I2C
address selection pin 3 and 4.
Supported modes:
ꢁ
ꢁ
ꢁ
ꢁ
ꢁ
Random/Sequential Read
Byte/Page Write
Standard : 0 to 100kHz clock frequency (slave mode)
Fast Mode : 0 to 400kHz clock frequency (slave mode)
High Speed: 0 to 3.4MHz clock frequency (slave mode)
The SDA signal is bidirectional and is used to read and write the seal dat. The SCL signal s thlock generated by the
host MCU, to synchronize the SDA data in read and write m. The maximum I²C clock frequency is 3.4MHz, data are
triggered on the rising edge of SCL.
4.3.1
I²C Electrical Specification
FS-mode+
-modCB=100pF
HS-mode CB=400pF
Symbol
VIL
Parameter
Condiion
Min
M
Mn
ꢀ0.5
Max
Min
ꢀ0.5
Max
Unit
V
LOWꢀLevel Input Voltage
HIGHꢀLevel Input Voltage
ꢀ0.5
0VDD
0.3VDD
0.3VDD
VIH
0.7VDD
D + 0.5
1)
0.7VDD
VDD +
0.5 (1)
0.7VDD
VDD + 0.5
(1)
V
Vhys
VOL
Hysteresis of Schmitt Trigger
Inputs
VDD< 2V
VDD 2V
0.1V
ꢀꢀ
ꢀꢀ
0.1VDD
ꢀꢀ
ꢀꢀ
0.1VDD
ꢀꢀ
ꢀꢀ
V
V
LOWꢀLevel Output Voltage
(openꢀdrain or openꢀcollector)
at 3mA Sink Current
0.2VDD
0.2VDD
0.2VDD
20
ꢀꢀ
IOL
ICS
LOWꢀLevel Output Current
VO4V
ꢀꢀ
3
ꢀꢀ
ꢀꢀ
3
ꢀꢀ
mA
mA
Pullꢀup current of SCLH
current source
ꢀꢀ
12
12
tSP
Pulse Width of Sikes hat
must be suppressd by the
Input ltr
ꢀꢀ
50 (2)
ꢀꢀ
10
ꢀꢀ
10
ns
Ii
Input Curret at each I/O Pin
Input Voltage
between
ꢀ10
ꢀꢀ
+10 (3)
550
ꢀꢀ
ꢀꢀ
ꢀꢀ
10
100
10
ꢀꢀ
ꢀꢀ
ꢀꢀ
10
400
10
ꢁA
pF
pF
CB
C
Total Capacitive Load for
ach Bus Line
I/O Capacitance (SDA, SCL)
ꢀꢀ
10
Table 14 I²C Electical Specification
(1) Maximum VIH = VDDmax +0.5V or 5.5V
(2) Input filters on the SDA and SCL inputs suppress noise spikes of less than 50 ns.
(3) I/O pins of Fastꢀmode and Fastꢀmode Plus devices must not obstruct the SDA and SCL lines if VDD is switched
off.
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.3.2
I²C Timing
FS-mode+
HS-mode CB=100pF
HS-mode CB=400pF
(5)
Symbol
fSCLK
Parameter
Condition
Min
Max
1000
ꢀꢀ
Min
ꢀꢀ
Max
3400
ꢀꢀ
Min
ꢀꢀ
Max
1700
ꢀ
Uit
Hz
ns
SCL clock Frequency
ꢀꢀ
tBUF
Bus Free Time; time between
STOP and START Condition
500
500
500
260
tHD;STA
Hold Time; (Repeated) START
Condition (1)
ꢀꢀ
160
160
ꢀꢀ
16
ꢀꢀ
ns
500
260
260
tLOW
LOW Period of SCL Clock
HIGH Period of SCL Clock
ꢀꢀ
ꢀ
ꢀ
ꢀꢀ
ꢀꢀ
ꢀ
320
120
160
ꢀꢀ
ꢀꢀ
ꢀꢀ
ns
ns
ns
tHIGH
tSU;STA
60
Setup Time for a Repeated
START condition
160
tHD;DAT
tSU;DAT
tR
Data Hold Time (2)
Data Setup Time (3)
450
ꢀꢀ
0
10
ꢀꢀ
70
ꢀꢀ
0
10
ꢀꢀ
150
ꢀꢀ
ns
ns
ns
50
20+0.1
Cb
Rise Time of SDA and SCL
Signals
12
ꢀꢀ
ꢀꢀ
20+0.1
Cb
tF
Fall time of SDA and SCL signals
10 (4)
ꢀꢀ
ꢀꢀ
ꢀꢀ
ꢀꢀ
ns
trCL
Rise time of SCLH signal
Ext. pullꢀup
source of 3mA
ꢀꢀ
ꢀꢀ
ꢀꢀ
ꢀꢀ
10
10
40
80
20
20
80
ns
ns
trCL1
Rise time of SCLH signal after
repeated START condition and
after an acknowledge bit
Ext. pullꢀu
source of mA
160
tfCL
Output rise time of SCLH signal
Ext. pllꢀup
ꢀꢀ
ꢀꢀ
10
40
20
80
ns
rce of 3mA
trDA
Output rise time of SDAH ignal
Output rise time of SDH signal
Setup Time for TOCondition
Noise margin at OW level
ꢀꢀ
ꢀꢀ
ꢀꢀ
ꢀꢀ
ꢀꢀ
ꢀꢀ
ꢀꢀ
10
10
80
80
ꢀꢀ
20
20
160
160
ꢀꢀ
ns
ns
ns
V
tfDA
tSU;STO
VnL
260
160
160
0.1VDDp
0.2VDDp
0.1VDDp
0.2VDDp
ꢀꢀ
0.1VDDp
0.2VDDp
ꢀꢀ
VnH
Noise argin HIGH level
ꢀꢀ
ꢀꢀ
V
Table 15 I²C Timing
(1) ar is time the first clock is generated
A device must internally provide a minimum hold time (120ns / max 250ns for Fastꢀmode Plus, 80ns / max 150ns for Highꢀ
peed mode) for the SDA signal (referred to the VIHmin of the SCL) to bridge the undefined region of the falling edge of SCL.
(3) A fastꢀmode device can be used in standardꢀmode system, but the requirement tSU;DAT = 250ns must then e met. This is
automatically the case if the device does not stretch the LOW period of the SCL signal. If such a device does strech the LOW
period of the SCL signal, it must output the next data bit to the SDA line tRmax + TSU;DAT = 1000 + 250 = 1250ns before the SCL
line is released.
(4) In Fastꢀmode Plus, fall time is specified the same for both output stage and bus timing. If series resistors are used this has to
be considered for bus timing
(5) For capacitive bus loads between 100pF and 400pF, the timing parameters must be linearly interpolated
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.3.3
Register Table
The following registers / functions are accessible over the serial I²C interface.
Address
dec
Access
Type
Name
Bit Nr.
Symbol
Default
Description
7
6
5
4
3
2
1
0
7
:
not used
Verify
Programming control register.
not used
Burn
Programming
Control
Programming must be enabled before burning he
fuse(s). After programming is an verification andory.
See programming procedure.
3
R/W
0
reserved
Programming Enable
not used
n.a.
I²C lave aress
5
R/W
+
Program
slave address consis5 progmable bits (MSBs)
and the hardware setg of Pins A1 and A2
I²C address <4> iby default not programmed and due
to thersn defined as '1'
I²C slave
address
21
inteny
invert
4
I²C address<4>
:
:
0
7
:
0
7
6
5
:
I²C addr
Zero Positio>
:
0
0
:
OTP Register
Zero Position
Hi
R/W
+
Program
22
23
Zero Position value high byte
Zero Position 6>
0
not used
n.a.
OTP Register
Zero Position
Low 6 LSBs
R/W
+
Program
Zero Psition <5>
:
Zero Position remaining 6 lower LSB's
:
7
0
7
:
4
3
2
1
7
:
6
5
:
0
7
:
0
7
6
5
:
ero Position <0>
AGC value<7>
:
0
:
Automatic
Gain
Control
Automatic Gain Control value.
0 decimal represents high magnetic field
255 decimal represents low magnetic field
250
R
R
AGC value<
0
no
n.a.
omp
Comp Low
OF
OCF
Magnitude<13>
:
0
0
0
1
0
:
251
Diagnostics
Magnitude
Diagnostic flags
252
253
254
55
R
R
R
R
Magnitude<6>
0
not used
Magnitude information afer ATAN calculation
n.a.
0
:
0
0
:
Magnitude<5>
:
Magnitude<0>
Angle<13>
:
Angle<6>
0
Angle Value afer ATAN calculation
and zero position adder
Ane
not used
n.a.
Angle<5>
:
0
:
0
Angle<0>
0
Table 16 Register Map I2C
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
4.3.4
I²C Slave address
HW
Pins
OTP cotent
(Default)
HW
Pins
random read
A
2
A
1
A
2
A
1
1
0
0
0
0
X
X
X
X
X
X
X
X
1
0
0
0
0
X X X X X X X X
Slave Address
Register Address
Slave Address
Data Byte (n)
HW
Pins
OTP cotent
(Default)
random write
A
2
A
1
1
0
0
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Register Address
Slave Address
Data Byte (n)
Figure 13 Slave addresconstrucn
The slave address consists of the hardware setting on pins 1, A2 and upper MSBs programmable y the user. The MSB of
the slave address (yellow) is internally inverted. This means y efault the resuldata is ‘1’. A read of the I²C slave
address register 21 will return a ‘0’ at the MSB.
4.4
PWM interface
The AS5048 provides a pulse width modulted output (PWM), wose uty cycle is proportional to the measured angle. The
PWM frequency is internally trimmd n accuracy of ±10% ovr full temperature range. This tolerance can be cancelled
by measuring the complete duty cycl
The PWM signal consists of different sections:
•
•
•
•
Init:
12 clocks
ꢀ> PWM = ‘high’
Error_n:
4 clocks
ꢀ> PWM ‘not(ystem_error)’
Data:
4095 clocks > PM = ‘angle_zero’ / ‘low’ (in case of error)
Exi
8 clocs
ꢀ> PWM = ‘low’
In case oan eror the data section is set to zero.
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
Figure 14 PWM Format
Parameter
Symbol
Value
Unit
PWM – Period
T_PWM
119 T_PWM_BIT
PWM – Bit Time
PWM Resolution
T_PWM_IT
NM
1
T_OC
bit
4096
Table 17 PWM Ped and resolution
5
Package Drawings and rkings
Package type: TSSOP14
Figure 15 Package Marking
5.1.1
ssembly Lot Code
The assemby lot code for standard “YYWWIZZ” is composed as follows:
X
ꢀ
ꢀ
ꢀ
ꢀ
Interface type: A=SPI / B=I2C
Year
YY
WW
I
Week
Plant identification letter
Letters for free traceability
ZZ
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
14ꢀLead Thin Shrink Small Outline Package TSSOPꢀ14
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
6
Application Information
6.1 Programming of the AS5048
6.1.1
Programming of the zero position
The absolute angle position can be permanent programmed over the interface. This could be useful for random placement o
the magnet on the rotation axis. A readout at the mechanical zero position can be performed and written back into thIC.
With permanent programming the position is nonꢀreversible stored in the IC. This programming can be performed only oce.
To simplify the calculation of the zero position it is only needed to write the value in the IC which was ead ut before from
the angle register.
6.1.2
Programming sequence with verification
To program the zero position is needed to perform following sequce:
1. Read angle information
2. Set the Programming Enable bit in the OTP control re
3. Write previous read angle position into OTP zero posin register
4. Read back for verification the zero position register data
5. Set the Burn bit to start the automatic progrmming procedure
6. Read angle information (equals to 0)
7. Set the Verify bit to load the OTP datagin into the internaregiss wh modified threshold comparator levels
8. Read angle information (equals to )
The programming can either be perored i5V operation usinthe inernal LDO, or in 3V operation but using a minimum
supply voltage of 3.3V. In case of 3V ation, also a 10uF capator is required on the VDD3 pin.
6.2 Diagnostic functions of the AS5048
The AS5048 provides diagnostics functions of the Ianalso diagnostic functions of the magnetic input field
Following diagnostic flags are available:
See Table 11 register address x3FFD (A48A) or Table 16 register address 251 dec (AS5048B)
OCF (Offset Compensation Fnishd), logic high indicates the finished Offset Compensation Algorithm. After power up the
flag remains always to logic hig.
COF (Cordic Overflw), lgic high indicates an out of range error in the CORDIC part. When this bit is set, the angle and
magnitude data s invad. The absolute output maintains the last valid angular value.
COMP loindates a weak magnetic field. It is recommended to monitor in addition the magnitude value.
COMhigh, indicated a high magnetic field. It is recommended to monitor the magnitude value.
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
6.3 Choosing the Proper Magnet
The AS5048 works with a variety of different magnets in size and shape. A typical magnet could be 6ꢀ8 mm in diameter and
≥2.5mm in height The magnetic field strength perpendicular to the die surface has to be in the range of ±30mT…±70mT
(peak).
The magnet’s field strength should be verified using a gaussꢀmeter. The magnetic flux BZ at a given distance, along a
concentric circle with a radius of 1.1mm (R1), should be in the range of ±30mT…±70mT.
typ. 6ꢀ8mm diameter
N
S
Mnet axis
Vertical field
component
R1 concentric circle;
radius 1.1mm
Vertical field
componen
Bv
(30…70mT)
360
0
3 60
Figure 16: Typical magnet and magnetic flux distribution
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
6.4 Physical Placement of the Magnet
The best linearity can be achieved by placing the center of the magnet exactly over the defined center of the chip as shown
in the drawing below:
3.2 mm
3.2 mm
1
2.5 mm
2.5 mm
Defined
center
Rd
Area of recomended maximum
magnet miignme
Figure 17: Defined chip centnet displacement rus
6.5 Magnet Placement
The magnet’s center axis should be aligned within a displacement raRof 0.25 mm (larger magnets allow more
displacement e.g. 0.5 mm) from the defined enter of the IC.
The magnet may be placed below or aboe the device. The disanshould be chosen such that the magnetic field on the
die surface is within the specified imThe typical distance “zbetween the magnet and the package surface is 0.5mm to
2.5mm, provided the use of the rmmended magneerial and dimensions (6mm x 3mm). Larger distances are
possible, as long as the required magnetic field strength ithin the defined limits.
However, a magnetic field outside the specified rage may still produce usable results, but the outꢀofꢀrange condition will be
indicated by indication flags.
S
N
Package surface
Die surface
Figure 18: Vertical placement of the magnet
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
7
Ordering Information
Delivery
Form
Model
Description
Package
AS5048AꢀHTSP
AS5048BꢀHTSP
14 –Bit Programmable Magnetic Rotary Encoder
with SPIꢀInterface
Tape&Reel
TSSOP 14
TSSP 14
14 –Bit Programmable Magnetic Rotary Encoder
with I2CꢀInterface
Tape&Reel
Table 18: Ordering Infotion
8
Revision History
Revision
Date
Owner
Desption
1.0
1.1
1.2
1.3
10-April-2012
16-April-2012
09-May-2012
20-June-2012
mub
mub
mub
mub
Initial revisin
Mincorrection text
Default pin configuratadded. Minor text corrections
2C Slave address explanation. Minor corrections.
www.austriamicrosystems.com
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Datasheet
AS5048A/AS5048B
Magnetic Rotary Encoder
14ꢀbit Angular Position Sensor
9
Copyrights
Copyright © 1997ꢀ2012, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, AustriaꢀEurope.
Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged,
translated, stored, or used without the prior written consent of the copyright owner.
All products and companies mentioned are trademarks or registered trademarks of their respective companies.
This product is protected by U.S. Patent No. 7,095,228.
10 Disclaimer
Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisios apearing in its
Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by desiptioregarding the
information set forth herein or regarding the freedom of the described devices frpatnt infringement.
austriamicrosystems AG reserves the right to change specificatis and pces at any time and witht notice. Therefore,
prior to designing this product into a system, it is necessary to chek wiaustriamicrosystAfor current information.
This product is intended for use in normal commercial aions. Applications requiring extended temperature range,
unusual environmental requirements, or high reliability applions, such as military, edical lifeꢀsupport or lifesustaining
equipment are specifically not recommended without additionaprocessing by autrimicrosystems AG for each application.
The information furnished here by austriamiosyems AG is believed o be correct and accurate. However,
austriamicrosystems AG shall not be liable to recipient or any third paor any damages, including but not limited to
personal injury, property damage, loss of rofitloss of use, intuptioobusiness or indirect, special, incidental or
consequential damages, of any kind, in onneion with or arising out othe furnishing, performance or use of the technical
data herein. No obligation or liabilitto ecipient or any thirparshall arise or flow out of austriamicrosystems AG
rendering of technical or other servic
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