AMS AS5040 User guide

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The technical content of this austriamicrosystems document is still valid.

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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

C23

10u

Vbat 5V 3V

GND

C4

100n

GND

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_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

R5

4.7k

R4

22k

C18

1u

GND

Analog_in

DS1

LED3

R6

1k

GND

J4

PWM

R1

10k

GND

C3

100n

GND

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

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.

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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