AMS AS5306 User manual

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Revision 1.3 / 2012/09/24
User Manual –AS5304 / AS5306 Demo Kit
AS5304 / AS5306
160-step Linear Incremental Position
Sensor with ABI output

AS5304 / AS5306 - Demo Kit User Manual
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Revision 1.3 / 09/24/12
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Table of Contents
1. General Description............................................................................................................... 2
2. Package and Board Description ............................................................................................3
3. How to get the kit running......................................................................................................7
4. Design Considerations ..........................................................................................................8
5. Schematics and BOM ............................................................................................................9
6. Ordering Information............................................................................................................ 11
Copyright..................................................................................................................................... 12
Disclaimer ................................................................................................................................... 12

AS5304 / AS5306 - Demo Kit User Manual
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1. General Description
This document describes the features and operation of the AS5304/-06 Demo Kit.
The AS5304 and AS5306 are Hall-based linear incremental magnetic position sensors. They
are suitable for high resolution, contactless linear or off-axis rotary position sensing utilizing
multipole strip or ring magnets.
The AS5304 Demo-kit mounts a multi-pole strip magnet with 2mm pole length and has a
resolution of 25um per step, while the AS5306 uses a multi-pole strip magnet with 1.2mm pole
length and has a resolution of 15um per step. Both AS5304 and AS5306 have 160-step
measurement range.
These demo kits allow the user to evaluate the AS5304/AS5306 in stand-alone mode. This can
be accomplished using connectors on the backside of the board.
For linear motion sensing, a multi-pole strip magnet is required (Figure 1). For off-axis rotary
motion sensing a multi-pole ring magnet is used (Figure 2).
Figure 1:
Arrangement with multi-pole strip magnet
Figure 2:
Arrangement with multi-pole ring magnet

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2. Package and Board Description
Demo Kit Contents
The demo kit includes following items listed below in Table 1.
Table 1:
Demo Kit Contents
Pos
Item
Comment
1
AS5304/AS5306 demo board
Including mechanics
2
USB 2.0 cable
For demo board supply
3
Multipole Magnet Slider
4
Quick Start Guide
Board Description
Figure 3:
Demo board

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Figure 4:
Demo board front view
(A) Incremental steps
(B) Calculated position
(C) Pole Pair Indicator
(D) Magnetic Field Strength
Indicator LED
(E) Multipole Magnet Slider
(F) ABI indicator LED’s
(G) Zero position reset button
Additional Information about the Position Sensor
On the back side, there are several options to connect directly to the signals of the demo board
for further evaluation of the chip.
Figure 5:
Demo board back view
(A) USB connector
(B) Battery connector
(C) Position sensor connector
(see Table 2 and Figure 6
for details)
(D) Jumper to disconnect
onboard position sensor
(see Figure 7 for details)
(E) Zero position reset button
A
B
C
D
E
F
G
B
A
C
E
D
D
D
D

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Position Sensor Connector
The Position connector allows the user to monitor the ABI signals from the AS5304/AS5306 as
well as to connect this demoboard to an external sensor (see below, Connection of an external
Sensor) as shown in Figure 7.
Table 2:
Position sensor connector pin out
Pin
Pin Name
Description
1
GND
Ground Signal
2
A_ext
A output
3
B_ext
B output
4
I_ext
I output
5
5V
Position Sensor supply
6
AO
Analog Output
Figure 6:
Position sensor connector
If the on-board sensor is used for the measurements the Analog Output (AO) provides an analog
output voltage that represents the Automatic Gain Control of the position sensor signal control
loop. This output is used to monitor the magnetic field strength respectively the air gap between
sensor and multipole magnet strip. For more details refer to the position sensor datasheet.
1Connection of an external Sensor
Connection of an external Sensor
With the jumpers, the onboard position sensor can be disconnected to use an external position
sensor. Follow the instructions below to use an external position sensor.
(1) Disconnect the power supply of the demoboard by unplugging the USB cable.
(2) Disconnect the onboard position sensor by removing P1, P2, P3, and P4 jumpers. See
Figure 7.
(3) As the onboard position sensor is disconnected, connect an external position sensor. For
example an AS5304 / AS5306 adapter board can be used. See Figure 7.
The AS5304 / AS5306 AB adapter board is optional and not included in the demo kit.

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Figure 7:
Using an external position sensor
Multipole Magnet Strip
The multipole magnet strips provided in the demo kits are made by Arnold Magnetics. The
AS5304-DK-ST-1.0 has a pole pair length of 4mm and the AS5306-DK-ST-1.0 has a pole pair
length of 2.4mm. The multipole magnet strips are mounted in an aluminum/aluminium slider.
See Figure 8 and Table 3 for details.
Find additional information about magnet requirements in the position sensor datasheet.
Figure 8:
Multipole Magnet Strip
Table 3:
Demo Kit Magnet
AS5304-DK-ST
AS5306-DK-ST
W
20 mm
20.4 mm
S
5 mm
5 mm
T
0.8 mm
0.8 mm
Lpp
4 mm
2.4 mm
3
2
1
Disconnect the demo board supply
Connect the external
position sensor
(not included)
Unplug jumpers P1, P2, P3, P4

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3. How to get the kit running
(1) Power up the demo board using the USB cable.
(2) During the start-up of the demo kit, a boot screen is shown offering basic information
about position sensor, firmware version and firmware release date. See Figure 9.
(3) After the start-up the position display is shown. The position display shows the actual
position counter value in steps and the calculated position in micrometer. Move the
multipole magnet slider. The position change is displayed. See Figure 10.
(4) Pull out the slider to remove the multi-pole magnet strip. At this point, the LEDs for
magnetic field strength and index will indicate a missing magnetic field.
(5) Fit the slider back into the mechanics. Press “Set Zero” to reset the position output.
(6) Unplug the USB cable to power down the board.
Figure 9:
Demo Kit Boot Screen
Figure 10:
Demo Kit Position Display
Position Sensor
Firmware Version, Release Date
Counter Value
Calculated Position
Magnet Pole Pair Indicator Bar

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4. Design Considerations
Table 4 shows the main features and charachteristics of the AS5304A/B and AS5306A/B for
linear movement of the multi-pole magnetic strip.
Table 4:
Position sensor options
Sensor
Magnet Pole Length
Resolution
Linear Speed
Outputs
AS5304A
2.0 mm
25 µm
20 m/s
Push Pull
AS5304B
2.0 mm
25 µm
20 m/s
Open Drain
AS5306A
1.2 mm
15 µm
12 m/s
Push Pull
AS5306B
1.2 mm
15 µm
12 m/s
Open Drain
Magnet type and position
Note that the Hall sensor array is located 1.02 mm off the horizontal chip center towards the
row of pins 11…20 as shown in Figure 11.
The magnet strip should be centered over the Hall sensor array.
Figure 11:
Hall sensor array in package

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5. Schematics and BOM
Schematics
The main components of the AS5304 / AS5306 demoboard are the onboard position sensor, the
quadrature counter, the main microcontroller and the display.
For easy integration of the AS5304 / AS5306, the LS7366 quadrature counter was choosen to
interface between position sensor and microcontroller. By using this component, the actual
position can be read out directly using the SPI interface.
The Silabs C8051F320 USB microcontroller reads the position steps and calculates the position
to show them on the LCD screen.
Find the complete schematic below for reference.
Figure 12:
Demo board schematic