AMS AS5045 User guide

austriamicrosystems AG

is now

ams AG

The technical content of this austriamicrosystems application note is still valid.

Contact information:

Headquarters:

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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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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

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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?Fami

lyID=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

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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

GND

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

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

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

GND

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

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

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

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AS5145-Ixx

only

Figure 9: AS5x45 Blockdiagramm

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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

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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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