AS5040 / AS5140 Demoboard OPERATION MANUAL Application note 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. LCD display (for standalone mode) Knob with D5x2.5mm diametral magnet, 2mm over the AS5X40 9V battery connector (standalone only) SiLabs C8051F320 microcontroller USB cable to the PC J6: External Encoder SSI Connector Quadrature A/B and Index output signal External (left) – Onboard (right) encoder selection switch SW1 Onboard AS5x40 output signals connector and indicators: Figure 1: AS5X40 Demoboard hardware with mounted 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. Revision 1.0, 29.January 2009 Page 1 of 12 www.austriamicrosystems.com AS5X40 Demoboard OPERATIONAL MANUAL 3.1 3.1.1 Hardware Indicators and Connectors 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. Magnet indicator: - OK (distance OK) - Magnet out of range Absolute angle value 10 bit resolution: 0 to 1023 Bargraph representation of the angle (0° to 359.6°) Magnet angle value: From 0 to 359.6° Figure 2: LCD display in standalone mode (9V battery or USB powered 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. Revision 1.0, 29-Jan-2009 www.austriamicrosystems.com Page 2 of 12 AS5X40 Demoboard OPERATIONAL MANUAL 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. VDD5 VDD33 2.2u AS5040 / AS5140 CSn VSS PROG CLK DO Demoboard switched to external encoder mode Figure 3: external AS5040/AS5140 connection to the demoboard Revision 1.0, 29-Jan-2009 www.austriamicrosystems.com Page 3 of 12 AS5X40 Demoboard OPERATIONAL MANUAL 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. 2. 3. 4. 4.2 check on your PC if Service Pack 2 is installed install the mentioned .NET package to your computer execute setup.exe Finally start the GUI using the shortcut in the start menu or desktop. 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. Device selection list: Change the encoder type if a different encoder type is connected externally on J6 and SW1 on left position Figure 4: AS5000 GUI detected the AS5040 Demoboard Revision 1.0, 29-Jan-2009 www.austriamicrosystems.com Page 4 of 12 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. Not used (dual die encoders only) Angle value: 10 bit absolute position: 0 to 1023 Status bits information Magnet range warning: - Green: magnet in Range - Orange: magnet to far Set counter clockwise Angle register value: Magnet angle value 0 to 359.6° Display update rate. The readout speed can be adjusted from 10ms to 1s Zero position register access: - Button SET: Sets the current angle as the 0° angle - Button RESET: resets the Zero Position register to 0 (default) Figure 5: SSI tab, allows access to the AS5X40 registers from the 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). Revision 1.0, 29.January 2009 Page 5 of 12 www.austriamicrosystems.com AS5X40 Demoboard OPERATIONAL MANUAL 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. Revision 1.0, 29-Jan-2009 www.austriamicrosystems.com Page 6 of 12 AS5X40 Demoboard OPERATIONAL MANUAL 5 AS5X40 Demoboard, Schematics, Blockdiagramm U1 5V 7 RegIn P2.7 P2.6 P2.5 P2.4 P2.3 P2.2 P2.1 P2.0 3.3V 6 C4 100n GND C5 1u VDD 3 GND GND J2 ISP C2CK 1 2 3 4 3.3V Header 4 9 10 RST/C2CK P3.0/C2D C2D GND J3 1 2 3 4 VBUS DD+ GND USB 8 5 4 VBUS DD+ 440478-1 GND D7 D6 D5 D4 D3 D2 D1 D0 19 20 21 22 23 24 25 26 Index B A 27 28 29 30 31 32 1 2 P0.7 P0.6 P0.5 P0.4 P0.3 P0.2 P0.1 P0.0 5 SHLD P1.7 P1.6 P1.5 P1.4 P1.3 P1.2 P1.1 P1.0 11 12 13 14 15 16 17 18 3V C3 Analog_in Prog Ext_CLK DO CSn LCD_E Int_CLK LCD_RW LCD_A0 R8 nc GND CS1n RESn A0 R/W E D0 D1 D2 D3 D4 D5 D6 D7 VDD VSS Vout Cap3Cap1+ Cap1Cap2Cap2+ V1 V2 V3 V4 V5 VDD C86 GND DS4 J7 DS3 nc 3.3V MagINCn MagDECn A B Index R7 nc Header 6 DS7 GND DS6 R15 1k GND Prog 1 2 3 4 5 6 7 8 MagINCn MagDECn A_LSB_U B_DIR_V nc Index_W VSS Prog DS5 nc nc nc R12 nc R11 nc R10 nc 3.3V C19 100n C20 100n C25 10n GND 16 15 14 13 12 11 10 9 VDD5V VDD3V3 nc nc PWM_LSB CSn CLK DO GND R5 R4 4.7k DS1 LED3 C22 22u GND Vout AS1360-50 2 3 C23 10u C21 1u 9V Battery Vin 3V GND GND 33R DisplayTech32128a Vout Int_DO SW1 J6 GND GND U4 1 GND Vin R13 5V Analog_in AS5045/AS5145 5V 1 LL4001 BL_A LCD Backlight R3 68k BAT54 U3 3 1 2 D3 BAS70-05 22k C18 1u R6 1k Header 2 68R GND GND Vbat R14 Vbat GND PWM Int_CSn Int_CLK Int_DO D2 D1 100n GND J4 PWM GND J5 C7 100n U2 nc MagINCn MagDECn A B Index 1 2 3 4 5 6 C6 J1 1 2 GND LCD_A0 3 100n LCD_RW 4 5 LCD_E D7..0 6 D0 7 D1 8 D2 9 D3 10 D4 C8 11 D5 1u/16V 12 D6 GND 13 D7 14 3V R2 15 C9 GND nc 16 1u/16V C10 17 1u/16V 18 C11 19 1u/16V 20 21 22 23 24 25 26 27 C12 C13 C14 C15 C16 3V 28 1u/16V 1u/16V 1u/16V 1u/16V 1u/16V C8051F320 3.3V R9 nc 3V R1 10k Shield C2 10u 0 C1 100n 2 GND DO CLK CSn 3.3V 5V Prog 1 2 3 4 5 6 7 Ext_DO Ext_CLK Ext_CSn Prog DO GND INT_CSn 3.3V 5V CSn MCLSS22_DPDT Header 7 External encoder AS1360-30 C24 1u GND Figure 7: AS5x40 Demoboard schematics Figure 4: AS5x40 Demoboard PCB Layout Revision 1.0, 29-Jan-2009 www.austriamicrosystems.com Page 7 of 12 AS5X40 Demoboard OPERATIONAL MANUAL Figure 9: AS5x40 Blockdiagramm Revision 1.0, 29-Jan-2009 www.austriamicrosystems.com Page 8 of 12 AS5X40 Demoboard OPERATIONAL MANUAL Index 1 2 3 General Overview.............................................................................................................................................................. 1 The AS5X40 Demoboard .................................................................................................................................................. 1 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 Revision 1.0, 29-Jan-2009 www.austriamicrosystems.com Page 9 of 12 AS5X40 Demoboard OPERATIONAL MANUAL Revision History Revision R1.0 Date March.16, 2009 Revision 1.0, 29-Jan-2009 Description First version www.austriamicrosystems.com Page 10 of 12 AS5X40 Demoboard OPERATIONAL MANUAL Contact Headquarters austriamicrosystems AG A 8141 Schloss Premstätten, Austria Phone: +43 3136 500 0 Fax: +43 3136 525 01 [email protected] www.austriamicrosystems.com Sales Offices austriamicrosystems USA, Inc. austriamicrosystems Germany GmbH 8601 Six Forks Road Tegernseer Landstrasse 85 Suite 400 D-81539 München, Germany Raleigh, NC 27615, USA Phone: +49 89 69 36 43 0 Phone: +1 919 676 5292 +49 89 69 36 43 66 Fax: +1 509 696 2713 Fax: austriamicrosystems Italy S.r.l. austriamicrosystems USA, Inc. 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