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1 General Overview
The AS5X40 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 0.35°
= 1024 positions per revolution (AS5X40). This digital data is available as a serial bit stream and as a PWM signal.
Furthermore, a user-programmable incremental output is available, making the chip suitable for replacement of various
optical encoders.
An internal voltage regulator allows the AS5X40 to operate at either 3.3 V or 5 V supplies.
2 The AS5X40 Demoboard
The AS5X40 demoboard is a complete rotary encoder system with built-in microcontroller, USB interface, graphical
LCD display, incremental indicators, commutation indicators and PWM output LED.
The board is USB powered or externally supplied with a 9V battery for standalone operation.
Figure 1: AS5X40 Demoboard hardware wit h mount ed magnet knob
3 Operating the AS5X40 Demoboard
The AS5X40 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
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/Multiturn/AGC will be displayed on the PC screen.
Some extra features as pole pair, zero position or AGC 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.
AS5040
/ AS5140
Demoboard
OPERATION MANUAL
Application note
9V battery connector
(standalone only)
USB cable to the PC
SiLabs C8051F320
microcontroller
Onboard AS5x40 output signals connector and indicators:
Quadrature A/B
and Index output signal
J6: External Encoder
SSI Connector
External (left) – Onboard
(right) encoder selection
switch SW1
Knob with D5x2.5mm
diametral magnet,
2mm over the AS5X40
LCD display (for standalone mode)
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3.1 Hardware Indicators and Connectors
3.1.1 Graphic LCD display
The LCD display shows the realtime absolute angle position of the magnet with a resolution of 0.35° = 1024 positions
per revolution (AS5X40) and the absolute value of the angle.
Turning the knob clockwise will increase the angle value until 359,6 then 0.
The magnet status indicator is related to the magnet position. If the magnet is too close to the encoder, “Magnet too
close” will be displayed. If the magnet is 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)
3.1.2 PWM LED
This LED is connected to the PWM output of the AS5X40. The PWM output is a pulse width that is proportional to the
angle of the magnet.
The pulse width varies from 1µs to 1024µs with a repetition rate of 1.0 kHz. 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 1023µs 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 (0 ~ 3V3) can be directly taken from the connector J4.
3.1.3 Incremental quadrature AB-Index LED
The phase shift between channel A and B indicates the direction of the magnet movement. Channel A leads channel B
at a clockwise rotation of the magnet (top view) by 90 electrical degrees. Channel B leads channel A at a counter
clockwise rotation.
One Index pulse (3V3) is generated at the angle 0 (see AS5X40 datasheet Figure 9)
The AB-Index LEDs are directly connected to the A B Index outputs of the AS5X40. These quadrature signals (0 – 3V3)
are available on connector J7.
3.1.4 MagINCn 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:
- OK (distance OK)
- Magnet out of range
Magnet angle value
:
F
rom 0 to 359
.
6
°
Absolute
angle
value
10 bit resolution: 0 to 1023
Bargraph representation of
the angle (0° to 359.6°)
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3.1.5 Encoder selection switch
The switch SW1 selects the encoder which communicates with the microcontroller through the SSI bus:
1. Right position (default): Onboard AS5040/AS5140
2. Left Position: External AS5040/AS5140 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 (AS5040 or AS5140), AS5040 and AS5140 can
be attached to J6 and evaluated. See figure 3.
• If the GUI is used for operation, additional devices AS5043, AS5143, AS5045 and AS5145 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 Error! Reference source not found. figure 4.
AS5040 / AS5140
DO
CLK
CSn
VDD5
VDD33
VSS
PROG
2.2u
Figure 3: external AS5040/AS5140 connection to the demoboard
Demoboard switched to external
encoder mode
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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 4 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 displayed in the right top corner. The GUI is divided into three main sections HOME, SSI and
OTP.
Figure 4: AS5000 GUI detected the AS5040 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
This mode displays in realtime the angle & absolute value, status bits and magnet range status.
By selecting the SSI (serial protocol for AS5040, AS5140, AS5043, AS5143, AS5045, AS5145) tab, the information of the
angular position and the status bits appears. See figure 5.
Figure 5: SSI tab, allows access to the AS5X 40 registers from t he serial bus
Value is the Angle data [D9: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.
The Status bits information are taken from the serial stream.
The Read Interval can be modified from 10 ms (fastest) to 1 s (slowest).
Ma
gnet angle value
0 to 359
.
6
°
Magnet
range warning
:
- Green: magnet in Range
- Orange: magnet to far
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:
10 bit absolute position: 0 to 1023
Not used
(dual die
encoders
only)
Status bits information
Set counter clockwise
Display update rate.
The readout speed can be adjusted
from 10ms to 1s
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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 AS5X40 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 AS5X40.
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[0:9] bits, or changing the Value field with a decimal number.
Field Pulses per Revolution: (The resolution can be reduced from 10bit down to 9, 8, 7 bit, by using the divider setting bits
Div1 and Div0)
- 0: 256 ppr (10 bit)
- 1: 128 ppr ( 9 bit)
- 2: 64 ppr ( 8 bit)
- 3: 32 ppr ( 7 bit)
Field Incremental Mode Selection: To change the Incremental AB-Index output to:
- 0: Default
- 1: Quadrature
- 2: Step Dir
- 3: Commutation
Note that the Zap! button is used for the AS5000 Programmer only and has no effect on the AS5X40 Demoboard.
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5 AS5X40 Demoboard, Schematics, Blockdiagramm
GN D
1
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
nc
DS4
nc
DS5
nc
DS6
nc
DS7
nc
R8
nc
R9
nc
R10
nc
R11
nc
R12
nc
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+
4
D-
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
GN D
1
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
8
DO
9
CLK
10
CSn
11
PWM_LSB
12
nc
13
nc
14
VDD3V3
15
VDD5V
16
U2
AS5045/AS5145C25
10n
GND
A
B
Index
MagINCn
MagDECn
Prog
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
1k
GND3.3V
Figure 7: AS5x40 Demob oard schematics
Figure 4: AS5x40 Demob oard PCB Layout
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Figure 9: AS5x40 Blockdiagramm
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Index
1 General Overview.............................................................................................................................................................. 1
2 The AS5X40 Demoboard .................................................................................................................................................. 1
3 Operating the AS5X40 Demoboard................................................................................................................................... 1
3.1 Hardware Indicators and Connectors ....................................................................................................................... 2
3.1.1 Graphic LCD display ........................................................................................................................................ 2
3.1.2 PWM LED ........................................................................................................................................................ 2
3.1.3 Incremental quadrature AB-Index LED ............................................................................................................ 2
3.1.4 MagINCn and MagDECn ................................................................................................................................. 2
3.1.5 Encoder selection switch.................................................................................................................................. 3
4 AS5000 Programmer GUI software................................................................................................................................... 4
4.1 Installing the GUI on the PC ..................................................................................................................................... 4
4.2 The Home tab ........................................................................................................................................................... 4
4.3 The SSI tab............................................................................................................................................................... 5
4.4 The OTP tab ............................................................................................................................................................. 6
5 AS5X40 Demoboard, Schematics, Blockdiagramm .......................................................................................................... 7
Index........................................................................................................................................................................................... 9
Revision History ....................................................................................................................................................................... 10
Contact ..................................................................................................................................................................................... 11
Copyright .................................................................................................................................................................................. 12
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Revision History
Revision Date Description
R1.0 March.16, 2009
First version
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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 5
th
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
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