austriamicrosystems AG
is now
ams AG
The technical content of this austriamicrosystems application note is still valid.
Contact information:
Headquarters:
ams AG
Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0
e-Mail: ams_sales@ams.com
Please visit our website at www.ams.com
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1 General Overview
The AS5045/AS5145A/B is a contactless magnetic rotary encoder for accurate angular measurement over a full turn of
360°.
It is a system-on-chip, combining integrated Hall elements, analog front end and digital signal processing in a single
device.
To measure the angle, only a simple two-pole magnet, rotating over the center of the chip, is required. The magnet may
be placed above or below the IC.
The absolute angle measurement provides instant indication of the magnet’s angular position with a resolution of
0.0879° = 4096 positions per revolution. This digital data is available as a serial bit stream and as a PWM signal.
An internal voltage regulator allows the AS5045/AS5145A/B to operate at either 3.3 V or 5 V supplies
Note: AS5145A/B are pre-programmed versions of AS5145. It provides 10bit (A) or 12bit (B) incremental output.
2 The AS5045/AS5145A/B Demoboard
The AS5x45 demoboard is a complete rotary encoder system with built-in microcontroller, USB interface, graphical LCD
display and PWM output LED.
The board is USB powered or externally supplied with a 9V battery for standalone operation.
Figure 1: AS5x45 Demob oard hardw are with mounted magnet knob
3 Operating the AS5045/AS5145A/B Demoboard
The AS5x45 demoboard can be used in several ways:
• As standalone unit supplied by a 9V battery
Connect a 9V battery to the battery connector on the top right side of the board. No other connections are required.
• As standalone unit supplied by an USB port
Connect the demoboard to a PC using a USB/USB cable (included in demoboard shipment). The board is supplied by
the 5V supply of the USB port. No other connections are required.
• As input device for the AS5000 Programmer GUI software
AS5045 / AS5145 Demoboard
9V battery connector
(standalone
only
)
USB cable to the PC
SiLabs C8051F320
microcon
troller
Onboard
AS5
x
45
output signals connector and indicators
MagINCn, MagDECn (J7) and PWM (J4) only are available with AS5045 and AS5145
Knob with D5x2.5mm
diametral magnet,
2mm over the AS5x45
LCD display (for standalone mode)
External (left)
–
Onboard
(right)
encoder selection s
witch
SW1
J6:
E
xternal Encoder
SSI Connector
Operation
Manual
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AS5X 45/AS5145A/B Demoboar d OPERATIO NAL MANUAL
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This configuration uses the same USB hardware connection as above, but additionally the AS5000 Programmer GUI
software is running. The LCD display will be turned off and the Angle/Status bits will be displayed on the PC screen.
Some extra features as zero position programming can be achieved. The parameters will not be permanently
programmed. All the parameters will be lost when the demoboard is shut down. For a permanent device programming,
the “AS5000 Programmer” hardware should be used.
3.1 Graphic LCD display
The LCD display shows the realtime absolute angle position of the magnet with a resolution of 0.09° = 4096 positions
per revolution (AS5045/AS5145A/B) and the absolute value of the angle.
Turning the knob clockwise will increase the angle value until 359.9° (value 4095), then 0°.
The magnet status indicator is related to the magnet position. If the magnet is too close or too far away from the
encoder, “Magnet out of range” will be displayed.
Figure 2: LCD display in standalo ne mode (9V battery or USB power ed without GUI)
3.2 PWM LED
The PWM LED is connected to the PWM output of the AS5045/AS5145A/B. The PWM output is a pulse width that is
proportional to the angle of the magnet.
The pulse width varies from 1µs to 4096µs with a repetition rate of 244Hz. Viewing the PWM signal on the LED results
in brightness that is proportional to the angle of the magnet. When the angle of the magnet is at 0°, the LED is almost
dark, as it is 1µs on and 4095µs off. Turning the knob clockwise towards higher angles increases the brightness of the
PWM LED, since the ON-pulse becomes longer and the OFF-pulse becomes shorter.
Likewise, the PWM output can be used as an analog output proportional to the angle, when the PWM signal is filtered
by a RC (or active) lowpass filter.
The PWM signal (digital 0 ~ 3.3V) can be directly taken from the connector J4.
3.3 MagINc and MagDECn
MagINCn and MagDECn are the magnetic field change indicators (magnetic field strength increase or decrease through
variation of the distance between the magnet and the device).
These outputs can be used to detect the valid magnetic field range. If both indicators lit simultaneously
(MagINCn = 0 and MagDECn = 0), the magnet is out of range, the airgap between the encoder and the magnet is too
high or too low. In that case, “Magnet out of range” will be displayed on the LCD display.
Magnet indicator:
- Distance OK
- Magnet out of range
Magnet angle value
from 0° to 359.9°
Absolut
e
angle
value
12 bit resolution: 0 to 4095
Bargraph representation of
the angle (0° to 359.9°)
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3.4 Encoder selection switch
The switch SW1 selects the encoder which communicates with the microcontroller through the SSI bus:
1. Right position (default): Onboard AS5045/AS5145A/B
2. Left Position: External AS5045/AS5145A/B connected on J6
The signals of the synchronous serial interface (DO, CLK, CSn, PROG) and the power supply (3.3V,
GND) of an external device can be connected directly to J6. In this configuration, the data of the serial
interface are displayed on the GUI or the LCD.
• In standalone mode, regardless to the demoboard type (AS5045, AS5145A/B), AS5045 and AS5145A/B
can be attached to J6 and evaluated. See figure 3.
• If the GUI is used for operation, additional devices AS5040, AS5140, AS5043 and AS5143 can be
connected to J6 and evaluated. In that case, the correct encoder must be selected instead of “Autoselect” in
the Device list of the PC software, see chapter 4.2 figure 4.
Figure 3: external AS5045/AS5145A/B connection to the demoboard
Demoboard switched to external
encoder mode
ams AG
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4 AS5000 Programmer GUI software
4.1 Installing the GUI on the PC
The preliminary software is developed for a Microsoft Windows XP operating system with Service Pack 2. In addition
the dotnet (.NET) framework version 2.0 or more must be installed on the PC. This package can be downloaded free of
charge from the Microsoft webpage:
http://www.microsoft.com/downloads/details.aspx?FamilyID=0856eacb-4362-4b0d-8edd-aab15c5e04f5&displaylang=en
Following Procedure is recommended before starting the GUI:
1. check on your PC if Service Pack 2 is installed
2. install the mentioned .NET package to your computer
3. execute setup.exe
4. Finally start the GUI using the shortcut in the start menu or desktop.
4.2 The Home tab
Figure 3 shows the main window of the GUI. On the top left corner, board information’s as firmware (FW) version and
demoboard name declaration can be found.
By default the GUI is in the auto detection mode. Any connected austriamicrosystems demoboard and programming tool will
be automatically detected and the device type is displayed in the right top corner of the main window. The GUI is divided into
three main sections HOME, SSI and OTP.
Figure 4: AS5000 GUI has detected th e AS 5045 Demoboard
Device selection list:
Change the encoder type if a different encoder type is
connected externally on J6 and SW1 on left position
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4.3 The SSI tab
By selecting the SSI (serial protocol for AS5040, AS5140, AS5043, AS5143, AS5045, AS5145A/B) tab, the real time
information of the angular position and the status bits are displayed. See figure 4.
Figure 5: SSI tab, shows the SSI bus data of the select ed encoder
Value is the Angle data [D11:D0] from the RD_ANGLE (Read Angle) serial command. This value is continuously
updated.
The Zero Pos. value represents the Zero Position register. By clicking on the Set button, the actual angle
“Value” is written into the Zero Position register. Clicking on Reset writes the value 0 to the Zero Position register.
The Magnetic Range Warning is continuously read from the RD_ANGLE serial command.
• Green lamp: Magnet in range
• Orange lamp: Magnet too far or too close. MagINC and MagDEC are set.
• Red lamp: Magnet too far or too close, angle value is invalid and LIN bit is set.
The red lamp is available only when OTP MagCompEN=1, available from the OTP tab.
The Status bits information is taken from the serial stream.
The Read Interval can be modified from 10 ms (fastest) to 1 s (slowest).
Magnet angle value
0 to 359.9°
Magnet
range warning
:
- Green: magnet in Range
- Orange: magnet too close or too far
- Red: magnet to close or too far, data
invalid (if MagCompEN = 1 only)
Angle register value:
Zero position register access:
-
Button SET: Sets the current angle
as the 0° angle
- Button RESET: resets the Zero
Position register to 0 (default)
Angle value
:
12 bit absolute position: 0 to 4095
N
ot used
(dual die
encoders
only)
Status bits information
Set counter clockwise
Display update rate.
The readout speed can be adjusted
from 10ms to 1s
ams AG
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4.4 The OTP tab
The OTP tab is normally used for the AS5000 programmer, but the OTP bits can be changed on the AS5x45 demoboard as
well.
Options like Zero Position, Pulses per revolution and Incremental Mode Selection can be changed by selecting the function
in “Fields”, then changing the parameter in “Options for the selected field” or directly the decimal value of this parameter in
“Value”.
Each time a field’s value has been changed, the corresponding OTP bits will be automatically checked in the right window.
The button Write should be clicked to write the parameter into the AS5x45.
The Read button reads back the OTP register, and updates the “Field” parameter as well as the OTP bits window.
Figure 6: OTP tab
Field Zero Position: To zero position value, like on the SSI tab. The zero position value can be changed by checking the
Z[11:0] bits, or changing the Value field with a decimal number.
Note: The Zap! button is used for the AS5000 Programmer only and has no effect on the AS5x45 Demoboard.
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5 AS5045/AS5145A/B Demoboard, Schematics, Blockdiagramm
GND1
Vout 2
Vin
3
U4
AS1360-30
D2
BAT54
C19
100n
1
2
J5
Header 2
VBUS 1
D- 2
D+ 3
GND 4
SHLD 5
J3
440478-1
1
2
3
4
J2
Header 4
CS1n
1
RESn
2
A0
3
R/W
4
E
5
D0
6
D1
7
D2
8
D3
9
D4
10
D5
11
D6
12
D7
13
VDD
14
VSS
15
Vout
16
Cap3-
17
Cap1+
18
Cap1-
19
Cap2-
20
Cap2+
21
V1
22
V2
23
V3
24
V4
25
V5
26
VDD
27
C86
28
Shield
0
J1
DisplayTech32128a
GND
GND
C23
10u
Vbat 5V 3V
GND
GND
C4
100n
GND
3.3V
3.3V
GND
C2
10u
D0
D1
D2
D3
D4
D5
D6
D7
D0
D1
D2
D3
D4
D5
D6
D7
LCD_A0
LCD_RW
Int_CLK
Analog_in
CSn
Ext_CLK
DO
LCD_E
LCD_E
LCD_RW
LCD_A0
A
B
Index
3.3V
GND
MagINCn
MagDECn
A
B
Index
Prog Int_DO
Int_CLK
PWM
Int_CSn
GND
DS3
LED_R
DS4
LED_R
DS5
LED_Y
DS6
LED_G
DS7
LED_G
R8
1k
R9
1k
R10
1k
R11
1k
R12
1k
1
2
3
4
5
6
J7
Header 6
GND
GND
R5
4.7k
R4
22k
C18
1u
GND
GND
Analog_in
DS1
LED3
R6
1k
GND
J4
PWM
R1
10k
GND
C3
100n
GND
3V
3V
GND
3V
GND
C16
1u/16V
C15
1u/16V
C14
1u/16V
C13
1u/16V
C12
1u/16V
GND
C8
1u/16V
C10
1u/16V
C11
1u/16V
GND
C9
1u/16V
R2
nc
C6
100n
C7
100n
3V
GND
C2CK
C2D
C1
100n
C5
1u
GND
P0.1 1
P0.0 2
P2.7 11
P2.6 12
P2.5 13
P2.4 14
P2.3 15
P2.2 16
P2.1 17
P2.0 18
P1.7 19
P1.6 20
P1.5 21
P1.4 22
P1.3 23
P1.2 24
P1.1 25
P1.0 26
P0.7 27
P0.6 28
P0.5 29
P0.4 30
P0.3 31
P0.2 32
GND
3
D+
4D-
5
VDD
6
RegIn
7
VBUS
8
RST/C2CK
9
P3.0/C2D
10
U1
C8051F320
C24
1u
5V
C22
22u
5V
R13
33R
BL_A
GND1
Vout 2
Vin
3
U3
AS1360-50
D1
LL4001
C21
1u
D3
BAS70-05
Vbat
R14
68R
LCD Backlight
D7..0
C20
100n
MagINCn
1
MagDECn
2
A_LSB_U
3
B_DIR_V
4
nc
5
Index_W
6
VSS
7
Prog
8DO 9
CLK 10
CSn 11
PWM_LSB 12
nc 13
nc 14
VDD3V3 15
VDD5V 16
U2
AS5040
A B Ind
C25
10n
GND
A
B
Index
MagINCn
MagDECn
Dec Inc
Prog
AS5x45-DB
9V Battery
USB
ISP
R3
68k
3.3V
1
2
3
4
5
6
7
J6
Header 7
Prog
5V
3.3V
CSn
CLK
DO
GND
GND
3.3V
5V
Ext_CSn
Ext_CLK
Ext_DO
Prog
External encoder
SW1
MCLSS22_DPDT
Int_DO
DO
CSn
INT_CSn
R7
nc
R15
nc
GND3.3V
AS5145-I10 / AS5145-I12:
- Populated: DS5, DS6, DS7, R10, R11,
R12
- NA: R7, R15
AS5045 - AS5145:
- Populated: R15 = 1k
- NA:DS5, DS6, DS7, R10, R11, R12
AS5045
AS5145
Figure 7: AS5x45/AS5145A/B-Ix Demobo ard schematics
Figure 8: AS5x45/AS5145A/B-Ix Demobo ard PCB Layout
ams AG
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AS5X 45/AS5145A/B Demoboar d OPERATIO NAL MANUAL
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AS5145-Ixx
only
Figure 9: AS5x45 Blockdiagramm
ams AG
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AS5X 45/AS5145A/B Demoboar d OPERATIO NAL MANUAL
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Index
1 General Overview.............................................................................................................................................................. 1
2 The AS5045/AS5145A/B Demoboard ............................................................................................................................... 1
3 Operating the AS5045/AS5145A/B Demoboard................................................................................................................ 2
3.1 Graphic LCD display................................................................................................................................................. 2
3.2 PWM LED ................................................................................................................................................................. 2
3.3 MagINc and MagDECn............................................................................................................................................. 3
3.4 Encoder selection switch .......................................................................................................................................... 4
4 AS5000 Programmer GUI software................................................................................................................................... 5
4.1 Installing the GUI on the PC ..................................................................................................................................... 5
4.2 The Home tab ........................................................................................................................................................... 5
4.3 The SSI tab............................................................................................................................................................... 7
4.4 The OTP tab ............................................................................................................................................................. 9
5 AS5045/AS5145A/B Demoboard, Schematics, Blockdiagramm ..................................................................................... 10
Index......................................................................................................................................................................................... 13
Revision History ....................................................................................................................................................................... 14
Contact ..................................................................................................................................................................................... 15
Copyright .................................................................................................................................................................................. 17
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Revision History
Revision Date Description
1.0 March 09, 2009 First version
1.1 March 25, 2009 Minor corrections
1.2 July 16, 2009 Add AS5145A/B-I10 and AS5145A/B-I12
1.3 July 22, 2009 Minor corrections
ams AG
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Contact
Headquarters
austriamicrosystems AG
A 8141 Schloss Premstätten, Austria
Phone: +43 3136 500 0
Fax: +43 3136 525 01
industry.medical@austriamicrosystems.com
www.austriamicrosystems.com
Sales Offices
austriamicrosystems Germany GmbH
Tegernseer Landstrasse 85
D-81539 München, Germany
Phone: +49 89 69 36 43 0
Fax: +49 89 69 36 43 66
austriamicrosystems Italy S.r.l.
Via A. Volta, 18
I-20094 Corsico (MI), Italy
Phone: +39 02 4586 4364
Fax: +39 02 4585 773
austriamicrosystems France S.A.R.L.
124, Avenue de Paris
F-94300 Vincennes, France
Phone: +33 1 43 74 00 90
Fax: +33 1 43 74 20 98
austriamicrosystems Switzerland AG
Rietstrasse 4
CH 8640 Rapperswil, Switzerland
Phone: +41 55 220 9008
Fax: +41 55 220 9001
austriamicrosystems UK, Ltd.
88, Barkham Ride,
Finchampstead, Wokingham
Berkshire RG40 4ET, United Kingdom
Phone: +44 118 973 1797
Fax: +44 118 973 5117
austriamicrosystems AG
Klaavuntie 9 G 55
FI 00910 Helsinki, Finland
Phone: +358 9 72688 170
Fax: +358 9 72688 171
austriamicrosystems AG
Bivägen 3B
S 19163 Sollentuna, Sweden
Phone: +46 8 6231 710
austriamicrosystems USA, Inc.
8601 Six Forks Road
Suite 400
Raleigh, NC 27615, USA
Phone: +1 919 676 5292
Fax: +1 509 696 2713
austriamicrosystems USA, Inc.
4030 Moorpark Ave
Suite 116
San Jose, CA 95117, USA
Phone: +1 408 345 1790
Fax: +1 509 696 2713
austriamicrosystems AG
Suite 811, Tsimshatsui Centre
East Wing, 66 Mody Road
Tsim Sha Tsui East, Kowloon, Hong Kong
Phone: +852 2268 6899
Fax: +852 2268 6799
austriamicrosystems AG
AIOS Gotanda Annex 5th Fl., 1-7-11,
Higashi-Gotanda, Shinagawa-ku
Tokyo 141-0022, Japan
Phone: +81 3 5792 4975
Fax: +81 3 5792 4976
austriamicrosystems AG
#805, Dong Kyung Bldg.,
824-19, Yeok Sam Dong,
Kang Nam Gu, Seoul
Korea 135-080
Phone: +82 2 557 8776
Fax: +82 2 569 9823
austriamicrosystems AG
Singapore Representative Office
83 Clemenceau Avenue, #02-01 UE Square
239920, Singapore
Phone: +65 68 30 83 05
Fax: +65 62 34 31 20
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Copyright
Devices sold by austriamicrosystems are covered by the warranty and patent indemnification provisions appearing in its
Term of Sale. austriamicrosystems makes no warranty, express, statutory, implied, or by description regarding the
information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems
reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this
product into a system, it is necessary to check with austriamicrosystems for current information. This product is intended for
use in normal commercial applications.
Copyright © 2009 austriamicrosystems. 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. To the
best of its knowledge, austriamicrosystems asserts that the information contained in this publication is accurate and correct.
However, austriamicrosystems shall not be liable to recipient or any third party for any damages, including but not limited to
personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or
consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical
data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems rendering of
technical or other services.
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