austriamicrosystems AS5045 User manual

Revision 1.0, 26-Jan-06 www.austriamicrosystems.com Page 1 of 20
1General Description
The AS5045 is a contactless angular measurement system-on-chip,
combining integrated Hall elements, analog front end and digital signal
processing in a single device.
It computes the mechanical angle of a simple 2 pole diametrically
magnetized magnet that is placed either above or below the device.
The AS5045 has a resolution of 12bits, providing 4096 absolute positions.
Furthermore, a PWM signal that is proportional to the angle is available.
The AS5045 can be configured to specific customer requirements by
programming a one time programmable (OTP) register. An internal voltage
regulator allows the AS5045 to operate from either 3.3 V or 5 V supplies.
Figure 1: Typical arrangement AS5045 and magnet
1.1 The AS5045 Demoboard
The AS5045 demoboard is a complete rotary encoder system with built-in microcontroller, USB interface , 4-digit 7-segment
display, mode LED, a PWM output LED and two magnet diagnostic LEDs. The board is USB powered or externally supplied
for standalone operation. Dimensions: 72mm x 54mm (2.82 x 2.13 inch).
1.1.1 Programming
The demoboard also supports external circuits using the AS5045, such as the AS5045 adapter PCB (as shown below) or
any other AS5045 customer application. These are connected to the demoboard and can be displayed, modified or
permanently programmed using the AS5045 Demo Software.
Figure 2: AS5045 demoboard with AS5045 adapter board
AS5045
PROGRAMMABLE MAGNETIC ROTARY ENCODER DEMOBOARD AND SOFTWARE
OPERATION MANUAL

AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER
Demoboard Operation Manual
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2Operating the AS5045 Demoboard
The AS5045 demoboard can be used in several ways:
As standalone unit supplied by a 9V-battery
Connect a 9V…12V supply to pins "GND" and "+9V" at the 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 AS5045 demoboard software
This configuration uses the same USB hardware connection as above, but additionally the AS5045 demoboard software
is running. All indicators on the demoboard will be displayed on the PC screen as well.
2.1 Hardware Indicators
Refer to Figure 2:
2.1.1 7-Segment Display
The 4-digit display shows the absolute angle position of the magnet as a 10bit digital word (0…1023). Each digit corresponds
to (360/1024) = 0.35 degrees.
Note: The absolute position is monitored continuously. It does not require moving the magnet to a zero position before it can
calculate the absolute position. When power is lost (e.g. when you unplug the demoboard and re-connect it), it will instantly
display the correct position.
2.1.2 PWM LED
This LED is connected to the PWM output of the AS5045. 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 0.976 kHz.
Viewing the PWM signal on a LED results in a brightness that is
proportional to the angle of the magnet. When the angle of the
magnet is at 0 degrees, the LED is almost dark, as it is 1µs on
and 1024µs 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 angle, when the PWM signal is filtered by a RC
(or active) lowpass filter.
Figure 3: PWM signal waveform with default OTP setting.
2.1.3 Mode LED
Applying Vdd to the Mode pin of the demoboard (J1, Pin3) will deactivate the internal filter and the Mode LED will be lit.
The mode input pin activates or deactivates an internal filter used to reduce the analog output noise.
Activating the filter (Mode pin = LOW or open) provides a reduced output noise of 0.03° rms. At the same time, the output
delay is increased to 384µs. This mode is recommended for high precision, low speed applications.
Deactivating the filter (Mode pin = HIGH) reduces the output delay to 96µs and provides an output noise of 0.06° rms. This
mode is recommended for higher speed applications.
Switching the Mode pin affects the following parameters:
Parameter slow mode (Mode = low or open) fast mode (Mode = high, VDD5V)
sampling rate 2.61 kHz (384 µs) 10.42 kHz (96µs)
transition noise (1 sigma) ≤0.03° rms ≤0.06° rms
output delay 384µs 96µs
max. speed @ 4096 samples/sec.
max. speed @ 1024 samples/sec.
max. speed @ 256 samples/sec.
38 rpm
153 rpm
610 rpm
153 rpm
610 rpm
2442 rpm
Table 1: Slow and fast mode parameters
1/fPWM
Angle
359.91 deg
(Pos 4095)
0 deg
(Pos 0)
1µs 4097µs
PWMIN
PWMAX
4096µs

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2.1.4 Mag I., Mag D. LEDs
The AS5045 provides several options of detecting movement and distance of the magnet in the Z-direction. Signal indicators
MagINCn and MagDECn are available both as hardware pins (pins #1 and 2) and as status bits in the serial data stream.
In the default state, the status LEDs Mag I, Mag D and pins MagINCn, MagDECn have the following function:
S
St ta at tu us s b bi it ts s H Ha ar rd dw wa ar re e p pi in ns s O OT TP P: : M Ma ag g C Co om mp pE En n = = 0 0 ( (d de ef fa au ul lt t) )
M
Ma ag g
I
IN NC C M
Ma ag g
D
DE EC C M
Ma ag g
I
IN NC Cn n M
Ma ag g
D
DE EC Cn n D
De es sc cr ri ip pt ti io on n
0 0 Off Off No distance change
Magnetic input field OK (in range, ~45…75mT)
0 1 Off On Distance increase; pull-function. This state is dynamic and only active while the magnet is
moving away from the chip.
1 0 On Off
Distance decrease; push- function. This state is dynamic and only active while the magnet is
moving towards the chip.
1 1 On On Magnetic input field invalid – out of recommended range:
too large, too small (missing magnet)
Table 2: Magnetic field strength variation indicator
When bit MagCompEn is programmed in the OTP, the function of status LEDs Mag I, Mag D and pins MagINCn, MagDECn
is changed to the following function:
S
St ta at tu us s b bi it ts s H Ha ar rd dw wa ar re e p pi in ns s O OT TP P: : M Ma ag g C Co om mp pE En n = = 1 1 ( (r re ed d- -y ye el ll lo ow w- -g gr re ee en n p pr ro og gr ra am mm mi in ng g o op pt ti io on n) )
M
Ma ag g
I
IN NC C M
Ma ag g
D
DE EC C L
LI IN N M
Ma ag g
I
IN NC Cn n
M
Ma ag g
D
DE EC Cn n D
De es sc cr ri ip pt ti io on n
0 0 0 Off Off No distance change
Magnetic input field OK ( GREEN range, ~45…75mT)
1 1 0 On Off
YELLOW range: magnetic field is ~ 25…45mT or ~75…135mT. The AS5045 may
still be operated in this range, but with slightly reduced accuracy.
1 1 1 On On
RED range: magnetic field is ~<25mT or >~135mT. It is still possible to operate the
AS5045 in the red range, but not recommended.
All other combinations n/a n/a Not available
Table 3: Magnetic field strength red-yellow-green indicator (OTP option)
Note: Pin 1 (MagINCn) and pin 2 (MagDECn) are active low via open drain output and require an external pull-up resistor. If
the magnetic field is in range, both outputs are turned off.

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2.2 Connectors
2.2.1 USB Connector
The USB connector is used to supply the demoboard with 5V power and as an interface to the AS5045 demoboard software,
if it is running.
2.2.2 7-pin Male Connector (left side on demoboard)
This connector is used to connect an external AS5045 encoder that can be displayed, modified and permanently
programmed with the AS5045 demoboard software (see Figure 13). It also fits the AS5045 adapter PCB (see Figure 2 and
Figure 14), which is available separately.
2.2.3 3-pin Male Connector (right side on demoboard)
This connector is used to connect an external supply (pins +9V, GND) for standalone operation, in case the USB connector
is not used. Pin Vzapp is the connector for the 8V programming voltage for permanently programming the external AS5045
(OTP).
2.3 Demo Board Dimensions
Figure 4: AS5045 Demo Board Dimensions.

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3AS5045 Demoboard Software
The AS5045 demoboard software can be downloaded for free from the Internet at:
http://www.austriamicrosystems.com/03products/products_detail/AS5045/download_AS5045.htm?#software
Although the AS5045 demoboard can be used as standalone unit, this software has several indicators and allows access to
extra features, such as:
Displaying the absolute angle as 12bit-word (0..4095), as absolute degrees (0..360) and as rotary dial
Displaying the pulse-width-modulated (PWM) output as bar-graph
Displaying the status and diagnostic bits of the AS5045
Programming the zero position (OTP)
Programming clockwise or counterclockwise operation
Putting the AS5045 in alignment mode to aid centering the magnet over the IC.
3.1 Getting Started
This software allows you to become familiar with the principle of the AS5045
magnetic rotary encoder. In order to get started, you need:
• The AS5045 demo software
• A Win2000®, Win-Me® or Win-XP® operating system
• The AS5045 demoboard and USB cable
• One free USB slot on your PC to connect the demoboard
3.2 Installing the Software
Installation Process: The installation process consists of three steps:
•Demoboard software installation
•Hardware driver installation
•Reboot
3.2.1 Step 1/3: Demoboard Software Installation
The demoboard should not be connected when the software is installed for the first time.
Run the File “AS50xx DemoSW Setup v.1.x.exe " and follow the step-by-step instructions.
The software packet contains several different versions. Make sure to select the software version related to the AS5045
demo board (not to the AS5040 or AS5043) to ensure proper function (see Figure 5).
Figure 5: Software Installation

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3.2.2 Hardware Driver Installation
Step 2/3: Installing the USB Controller
Connect the demoboard to a free USB slot on your PC. Your Windows® software
will automatically detect the USB controller on the demoboard:
When prompted for an installation file, refer to the file "ezusbw2k.inf" that was extracted during the demoboard software
installation (step 1) in the directory of your choice
(default C:\program files\austriamicrosystems AG\AS5045_DemoBoardSW_x.x).
After completing the installation, you should get this or a similar message (depends on platform):
Click on "finish".
3.2.3 Step 3/3: Reboot
Reboot your PC if requested by the operating system.

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3.3 Software Usage
After starting the software the demo board displays several tabs described below.
Note: Before starting the software the board needs to be connected to the PC. For details read section 7.2.
3.3.1 SSI Readout
After starting the demo software by double-clicking the “AS5045.exe” icon and selecting the SSI-Readout tab, status and
angle information of the Synchronous Serial Interface (SSI) are displayed (see Figure 6).
Figure 6: SSI-Readout Tab.
Absolute angle information:
The absolute angle information is displayed in analogue and digital form. It is calculated as:
degree = (360/4096*absolute position).
Absolute position information:
This indicator displays the absolute encoder position as a 12-bit value. Each digit corresponds to
(360 degrees / 4096) = 0.0879 degrees. The range of the serial absolute output is always 0 to 4095.
State Indicators:
Offset Comp Finish: indicates the finished offset compensation. Data is valid, when this bit = 1.
CORDIC Overflow: Internal DSP error. Data is invalid when this bit = 1.
Linearity Alarm: Internal DSP warning. The accuracy will be reduced when this bit = 1.
Magnitude Increment, Magnitude Decrement: These bits are set when the magnetic field becomes stronger
(MagInc = 1) or weaker (MagDec = 1), e.g. when the magnet is moved away or towards the chip. These signals
can be used to add a pushbutton function to the AS5045. When both bits are set, they indicate that the magnetic
field strength is out of the recommended range of 45 - 75mT (>75mT to close, <45mT to far). The AS5045 will still
continue to operate, even when both bits are set, but the accuracy may be out of spec.
Even Parity: Parity bit for transmission error detection.
Encoder: Onboard / External:
This field selects whether the onboard AS5045 (on the demo board) or an external AS5045 (connected to the 7-pin
connector at the left side of the demo board) is selected. Note that permanent write (programming) is only enabled
for the external Encoder.

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USB connection status:
Displays the status of the USB connection. The connection is not polled permanently by the PC operating system,
so it may take a few seconds before the actual status is updated. If the status displays "USB: no connection", try to
unplug and re-connect the USB cable. See also section 7.2 “Suggested Sequence of Connecting and
Disconnecting”.
Figure 7: USB connection status
Sub-Window:
By double-clicking the angular gauge, a separate, resizable window appears, showing the gauge and the
incremental outputs in detail (see Figure 8)
Figure 8: SSI-Tab Sub-Window.
PWM indicator:
The bar-graph indicator simulates the pulse-width-modulated (PWM) output signal of pin #12 (PWM_LSB). The
blue bar represents the ON-period of the signal and the white bar represents the OFF-period.
The PWM output always has a resolution of 12bit, with a pulse width of 1µs per step (optional 2µs).
User Parameter:
PWM Disable: will disable the PWM output. Output is disabled when this bit = 1.
CCW: will change the output to counter-clockwise-operation when bit = 1.
MagCompEn: Magnetic range indication (see Table 3 and Figure 9) when this bit = 1.
Figure 9: MagCompEn: Green, Yellow, Red range indication

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3.3.2 Zero Position Tab
This tab allows you to set an individual zero position or counter-clockwise operation temporarily by modifying the according
OTP bits (Z0…Z9, CCW). When applying a programming voltage of 7.5 to 8 Volts to pin PROG (see next page) and clicking
“permanent write”, those bits can be programmed permanently (see Figure 10).
Figure 10: Zero Position Programming.
Zero Position Programming:
Binary Indicator: This indicator will display the absolute position, which is the new Zero-position as a binary code.
This value is updated, every time the button "set current angle = 0" is clicked. The factory default setting is 0. If,
after power-up, a value other than 0 is displayed, this indicates that the encoder has already been programmed.
Decimal Indicator: This indicator will display the absolute position, which is the new Zero-position as a decimal
number. This value is updated, every time the button "set current angle = 0" is clicked. The factory default setting is
0. If, after power-up, a value other than 0 is displayed, this indicates that the encoder has already been
programmed.
Button “Read”: This button reads the settings of the OTP register. It will overwrite any settings made since the
last power-up, e.g. incremental mode, resolution, zero-position, index or ccw.
Button “Set Current Angle”: When this button is pressed, the currently read angle is updated as the new
temporary zero position. The Indicators will display the current (internal) reading and the absolute output will be
reset to = 0.
Clockwise / Counter-clockwise operation: This selector reverses the direction of both the incremental as well as
the absolute outputs. This bit should be set, when the magnet is placed underneath the AS5045 to match the
physical rotation with the indicated rotation.
Permanent programming:
The button “permanent write” is used to program the OTP registers permanently. It can only be used for the
external encoder and it is disabled by firmware when the onboard encoder is selected. To write the register
settings permanently, a programming DC voltage of 7.5V to 8V must be applied to pin Vzapp (+) of the 3-pin
connector on the right hand side of the demo board (top view). The external supply must be able to source up to
130 mA.
All the required timings for programming the external AS5045 encoder are controlled by the AS5045 demo board
USB controller. As long as no programming voltage is applied to the chip, clicking the "permanent write" button has
no effect, although a warning message is displayed.

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3.3.3 Alignment Mode Tab
The Alignment Mode simplifies the centering of the magnet over the chip surface. In this mode, the absolute value
of the 10-bit angular data of the SSI interface indicates the magnitude of misalignment at a particular angle.
A low value indicates a well-centered magnet. A high value indicates that the magnet is off-center and needs to be
shifted towards the diagonal center of the encoder.
A high value indicates large X or Y displacement, but also higher absolute magnetic
field strength. The magnet is properly aligned, when the difference between highest
and lowest value over one full turn is at a minimum.
Under normal conditions, a properly aligned magnet will result in a reading of less
than 32 over a full turn. The MagINCn and MagDECn indicators will be = 1 when the
alignment mode reading is < 32. At the same time, both hardware pins MagINCn (#1)
and MagDECn (#2) will be pulled to VSS. A properly aligned magnet will therefore
produce a MagINCn = MagDECn = 1 signal throughout a full 360° turn of the
magnet.
When clicking on the “Enable Alignment” button the alignment reading is displayed
on the right hand side (see Figure 11).
When checking “Cyclic Update” the position and angle of the encoder is displayed
(see Figure 12) additionally to the alignment. The additional reading of the position will influence the performance
of the alignment reading.
Figure 12 Alignment Mode
Stronger magnets or short gaps between magnet and IC may show values larger than 32. These magnets are still
properly aligned as long as the difference between highest and lowest value over one full turn is at a minimum.
Figure 11: Alignment Enabled

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All functions of the AS5045 can still be used, even when the magnet is misaligned. However, the linearity error will
increase with increased misalignment.
3.4 Help Files
After installation of the software the help file AS5045.chm can be found in the installation directory. It can be
opened by double-clicking or clicking one of the Help-Buttons of the application.
3.5 Connecting and Programming an External AS5045
You can read and program an external AS5045 encoder by connecting it to the AS5045 demoboard as shown below:
AS5045 Demoboard
2
3
4
5
6
7
89
10
11
12
13
14
15
161MagINCn
MagDECn
NC
NC
NC
Mode
VSS
Prog_DI DO
CLK
CSn
PWM
NC
NC
VDD3V3
VDD5V
AS5045
IC1
+
7
2
3
4
5
6
1
10n 1µF
µC
Cap only required for
OTP programming
GND
PROG
CSN
DO
CLK
5VUSB
VDD3V3
VSS
+
10µF
2
3
1
GND
VSS
VPROG
7.5 … 8.0V
only required for
OTP programming
connect to USB
interface on PC
USB
For programming,
keep these 6 wires
as short as possible!
max. length = 2 inches (5cm)
22k
*see Text
3V3
Figure 13: Connection diagram for an external AS5045 encoder Connections
Since the onboard controller on the AS5045 demo board is supplied by 3.3V, the external AS5045 encoder must be
configured for 3.3V supply as well. This is done by connecting pin VDD3V3 of the demo board to both pins 15 (VDD3V3) and
16 (VDD5V) of the external encoder.
Signal GND is connected to pin 7 (VSS).
A 1µF capacitor close to the IC, between the 3.3V supply and VSS (GND) is recommended, when the cable between demo
board and external encoder is longer than about 1 foot (30 cm). OTP programming is only recommended with short wires
(max. 5cm / 2 inches) between demo board and external AS5045 (see 3.5.3).
* If longer cables are used, a pull-down resistor at the DO line of 22k - 56k Ohms is recommended to discharge the signal
between data transmissions and no static voltage is built up.
The other required signals are CSn, CLK and DO.
For OTP programming and OTPread operations, signal PROG is also required.
3.5.1 Reading the External AS5045
The external AS5045 encoder can be read in the same way as the internal encoder.
Switching from internal to external encoder can be done on the bottom left corner of the demoboard software screen:
Encoder = external:
Additionally, when encoder = external is selected, the buttons "Permanent write" and "Read" are enabled in the "Zero
Position" and "Incremental Mode" screens to allow OTP programming of the external encoder.

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3.5.2 Changing Zero Position or User Parameter.
The programming options like zero position or other user parameter (MagCompEn, CCW, PWMDisable) can be modified at
any time during normal operation. Permanently programming these registers will set the default setting after power-up.
Programmed settings can again be modified during normal operation but will be reset to the programmed default state when
the power supply is interrupted.
3.5.3 OTP Programming of the External AS5045 Encoder:
To program (zap) the external AS5045 encoder, a programming voltage of 7.5 to 8V DC (130mA) must be applied to pins
Vzapp and GND of the 3-pin connector at the right hand side of the demoboard. A 10µF buffer cap is recommended for this
voltage (see Figure 13).
Programming is not recommended with long wires between demoboard and external encoder, as the inductance of the cable
may generate high voltage spikes, that can cause wrong programming or even harm the IC. The maximum wire length
between the demoboard connector and the external encoder should be 50mm (2”). Additionally, a 10nF ceramic capacitor
should be connected close to pin PROG and VSS.
For programming and OTP subsequent read operations, all signals shown in Figure 13 are required: PROG, CSn, DO, CLK,
VDD3V3 and VSS. All these wires should have equal length.
An OTP (one time programming) cycle is automatically initiated, when button "Permanent write" is pressed.
The default (non-programmed) logic state is "0", consequently the programmed logic state is "1". After programming, the chip
must be reset by unplugging and reconnecting the demoboard (follow the instructions on the screen). If the external chip is
not supplied by the demoboard but by an external voltage source, unplug and reconnect this supply as well.
The default state of unprogrammed bits is logic 0, programmed bits will be in logic 1 state.
Repeated OTP programming cycles are possible. Bits with a logic 0 state may still be programmed to logic 1 state, even if
some other bits of the chip have already been programmed. However, bits with a logic 1 state cannot be programmed back
to logic 0 state.
For repeated programming cycles, it is recommended to write a “0” into bits that are already programmed. Only those bits
that are supposed to be programmed should be set to logic 1.
Note that the chip will not be programmed, as long as no programming voltage is applied to Vzapp, although
the software will issue a warning message that the chip will be permanently programmed.

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3.6 Connecting the AS5045 Adapter PCB to the Demoboard
Figure 14: AS5045 adapter PCB: top and bottom view
Note: further information about the AS5045 adapter PCB is available in a separate document:
"AS5045 Adapter PCB Operation Manual".
The AS5045 adapter PCB is intended as a standalone device that allows easy and quick testing of the AS5045 without the
need of having to make your own PCB.
It allows access to each IC pin via a standard 100mil pitch, 600mil Dual-In-Line connector, has LEDs on all digital outputs
and comes with an onboard 5V linear voltage regulator (78L05) and a battery clip to supply the board from a 9V battery.
The 7-pin female connector is designed to fit directly onto the AS5045 demoboard and use the adapter PCB as external
encoder (software setting: Encoder = external).
The demoboard however, runs at 3.3V supply voltage. The adapter PCB is configured for 5V supply voltage. Connecting
both boards without modifications will not harm any of the boards, but may lead to data transmission errors due to the
different digital levels, especially when an extension cable is used between demoboard and adapter PCB.
If you use the adapter PCB as external encoder for the AS5045 demoboard with an extension cable or experience data
transmission errors, it is recommended to configure the adapter PCB for 3.3V supply voltage.
Perform the following modifications:
disconnect the 5V supply between demoboard and adapter PCB: cut off pin "+5VUSB" at the bottom of the AS5045
demoboard
connect pins "3V3" and "5V" (see component print) on the adapter PCB. Ideally, connect the pins right at the bottom of
the 7-pin female connector with a piece of wire or solder joint.
you may also remove the 78L05 voltage regulator from the adapter PCB to prevent accidental damage of the IC when
an input voltage is applied to the regulator (and the 5V output is fed to the VDD3V3 supply pin)

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4Pin Description
Pin Symbol Type Description
1 MagINCn DO_OD
Magnet Field Magnitude
INCrease; active low, indicates a
distance reduction between the
magnet and the device surface.
2 MagDECn DO_OD
Magnet Field Magnitude
DECrease; active low, indicates
a distance increase between the
device and the magnet. Table
3 NC - must be left unconnected
4 NC - must be left unconnected
5 NC - must be left unconnected
6 Mode - select between slow (open, low :VSS) and fast (high) mode.
Internal pull-down resistor.
7 VSS S Negative Supply Voltage (GND)
8 Prog_DI DI_PD
OTP Programming Input and
Data Input for Daisy Chain
mode. Internal pull-down resistor
(~74kΩ).
Connect to VSS if not used
9 DO DO_T
Data Output of
Synchronous Serial Interface
10 CLK DI,
ST
ClockInput of
Synchronous Serial Interface;
Schmitt-Trigger input
11 CSn DI_PU,
ST
Chip Select, active low; Schmitt-
Trigger input, internal pull-up
resistor (~50kΩ)
12 PWM DO Pulse Width Modulation of
approx. 1kHz; LSB in Mode3.x
13 NC - Must be left unconnected
14 NC - Must be left unconnected
15 VDD3V3 S
3V-Regulator Output, internally
regulated from VDD5V.Connect
to VDD5V for 3V supply voltage.
Do not load externally.
16 VDD5V S Positive Supply Voltage, 3.0 to
5.5 V
Figure 16: AS5045 pin-out and alignment tolerances
DO_OD digital output open drain
S supply pin
DO digital output
DI digital input
DI_PD digital input pull-down
DO_T digital output /tri-state
DI_PU digital input pull-up
ST Schmitt-Trigger input
4.1 Pin-Out and Magnet Misalignment
Shown above is the pin assignment and description for the AS5045. The Hall Sensors are arranged as a concentric circle at
the center of the IC with a diameter of 2.2mm (87mil). The recommended magnetic field strength at this concentric circle is
45…75mT (see datasheet).
Ideally, the center of the magnet should be located right above the center of the IC (see graph). The more the magnet is off-
center, the higher will be the non-linearity (deviation of actual position to indicated position). Consequently, the accuracy of
the system depends on the misalignment of the magnet. For best performance, the magnet should be centered within a
circle of 0.5mm diameter at the center of the chip.
2
3
4
5
6
7
89
10
11
12
13
14
15
161
MagINCn
MagDECn
NC
NC
NC
Mode
VSS
Prog_DI DO
CLK
CSn
PWM
NC
NC
VDD3V3
VDD5V
AS5045
Figure 15: AS5045 pin assignment
1
Defined
center
2.433 mm
2.433 mm
3.9 mm 3.9 mm
A
rea of allowed magnet
misalignment: 0.5mm diameter
Circle of Hall elements
on chip: 2.2mm diameter
Magnet alignment tolerances

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5AS5045 Demoboard Schematic

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6Demoboard Schematic Description
6.1 Main Parts
AS5045 rotary encoder
Microcontroller
Power supply
Indicators
Connectors
6.1.1 AS5045 Rotary Encoder
The AS5045 (IC3) is configured for 3.3V supply (pin 15 & 16 tied together). The serial interface (pins CSn, CLK, DO) is
controlled by the microcontroller. The Mode output, Magnet diagnostic outputs (MagInc, MagDec) and PWM output are
directly connected to LEDs
6.1.2 Microcontroller
The installed Cypress™ EZ-USB controller (IC1) includes an on-chip USB PC-interface. The firmware is stored in an external
E²PROM (IC2). The I/O-ports directly control the AS5045 and the 4-digit 7-segment display.
The firmware is configured such that the demoboard runs as standalone application or as an input device for the demoboard
software. No user switching is required, the software detects automatically, which mode is required.
Furthermore, the controller provides the proper pulse timings for OTP programming of an external AS5045 encoder,
connected to CON2. All that is required for programming is an external DC voltage of about 7.5V / 130mA.
6.1.3 Power Supply
The 3.3V supply is provided by the linear voltage regulator IC5. Either the 5V supply from the USB port or an external DC
voltage at pin 2/Con3 may be used as supply inputs.
6.1.4 Indicators
The 4digit 7-segment display for the absolute angle is controlled directly by the Microcontroller. The LEDs are connected to
the digital outputs of the AS5045
6.1.5 Connectors
CON1 = USB connector for data transmission and power supply from PC
CON2 = 7-pin male 100mil pitch connector for connecting an external AS5045 application or the AS5045 adapter PCB (see
chapter 3.6)
CON3 = 3-pin male 100mil pitch connector for connecting an external power supply and the OTP programming voltage.

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7Troubleshooting
7.1 Required Files
If you experience problems with the software, check that the required files are present:
Installation directory (default C:\program files\austriamicrosystems AG\AS5045_DemoBoardSW_x.x):
•as 5040.exe
•AS5045.chm
•ezmon.sys
•ezusb.sys
•ezusbw2k.inf
In the [windows][system32][drivers] directory:
•ezmon.sys
•ezusb.sys
In the [windows][system32][drivers]/inf directory:
•ezusbw2k.inf
7.2 Suggested Sequence of Connecting and Disconnecting
When operating the demo board and software it is advisable to proceed as:
7.2.1 Running the demo software
Before starting the demo software the demo board needs to be connected to the USB port of the PC.
1. Connect to the USB port.
2. Start the software.
7.2.2 Closing the demo software
After finishing the work with the demo board the software needs to be closed before disconnecting the demo board.
1. Close the software.
2. Disconnect from the USB port.
7.3 No USB Connection when Starting the Program
If the application can not connect to the demo board it is indicated in the lower left corner as shown in Figure 17.
Figure 17 No USB Connection
•In this case please check the USB connection by unplugging and re-connecting the demo board.
(Note that the software does not respond immediately after you unplugged and re-connected it. It may take a few
seconds before the USB connection is established.)
•Verify all the required files are installed properly (see above)
•Verify the correct installation of the USB controller by calling the device manager ([start] [settings] [control panel]
[system] [hardware] [device manager]) shown in Figure 18.

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Figure 18 Device Manager Entry
7.4 USB Driver Error
If case the Device Manager displays a warning sign (see Figure 19) re-install the driver by double-clicking the device and
selecting “Update Driver” as shown in Figure 20.
Figure 19 USB Driver was not installed correctly. Figure 20 Update of the Driver in Case of Errors.
Re-install the drivers by specifying the path to the "ezusbw2k.inf" as described in section 3.2.2.
(Default direcory C:\program files\austriamicrosystems AG\AS5045_DemoBoardSW_x.x).
Note that you will only find the device listed in the Device Manager when the demo board is connected!
7.5 Hardware and software compatibility
Every AS50xx demoboard is designed to read or program all kinds of externally connected encoders (e.g. a AS5040
demoboard is capable of programming AS5035, - 43 and - 45 as well). Due to the variety of encoder – demoboard –
software combinations it is advisable to cross-check the setup with application note “AS5000 Hardware / Software
Compatibility”.

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8Revision History
Revision Date Description
1.0 26. Jan. 2006 Initial Creation
1.1 04. Jul, 2006 Figure 4: AS5045 Demo Board Dimensions.
9Contact
Headquarters
austriamicrosystems AG
A 8141 Schloss Premstätten, Austria
Phone: [phone]
Fax: [phone]
[email protected]
www.austriamicrosystems.com
9.1 Sales Offices
austriamicrosystemsGermany GmbH
Tegernseer Landstrasse 85
D-81539 München, Germany
Phone: [phone]
Fax: [phone]
austriamicrosystems Italy S.r.l.
Via A. Volta, 18
I-20094 Corsico (MI), Italy
Phone: [phone]
Fax: [phone]
austriamicrosystems France S.A.R.L.
124, Avenue de Paris
F-94300 Vincennes, France
Phone: [phone]
Fax: [phone]
austriamicrosystems Switzerland AG
Rietstrasse 4
CH 8640 Rapperswil, Switzerland
Phone: [phone]
Fax: [phone]
austriamicrosystems UK, Ltd.
88, Barkham Ride,
Finchampstead, Wokingham
Berkshire RG40 4ET, United Kingdom
Phone: [phone]
Fax: [phone]
austriamicrosystems AG
Klaavuntie 9 G 55
FI 00910 Helsinki, Finland
Phone: [phone]
Fax: [phone]
austriamicrosystems AG
Bivägen 3B
S 19163 Sollentuna, Sweden
Phone: [phone]
austriamicrosystems USA, Inc.
8601 Six Forks Road
Suite 400
Raleigh, NC 27615, USA
Phone: [phone]
Fax: [phone]
austriamicrosystems USA, Inc.
4030 Moorpark Ave
Suite 116
San Jose, CA 95117, USA
Phone: [phone]
Fax: [phone]
austriamicrosystems AG
Suite 811, Tsimshatsui Centre
East Wing, 66 Mody Road
Tsim Sha Tsui East, Kowloon, Hong Kong
Phone: [phone]
Fax: [phone]
austriamicrosystems AG
AIOS Gotanda Annex 5th Fl., 1-7-11,
Higashi-Gotanda, Shinagawa-ku
Tokyo 141-0022, Japan
Phone: [phone]
Fax: [phone]
austriamicrosystems AG
#805, Dong Kyung Bldg.,
824-19, Yeok Sam Dong,
Kang Nam Gu, Seoul
Korea 135-080
Phone: [phone]
Fax: [phone]
austriamicrosystems AG
Singapore Representative Office
83 Clemenceau Avenue, #02-01 UE Square
239920, Singapore
Phone: [phone]
Fax: [phone]

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10 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 © 2006 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
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