AMS AS5601 User manual

www.ams.com Revision 1.0 / 30.06.2014 page 1/11
AS5601
12-bit Programmable Contactless Potentiometer
Operation Manual: AS5601-SO_RD_ST

AS5601-SO_RD_ST
Operation Manual
www.ams.com Revision 1.0 / 30.06.2014 page 2/11
Table of Contents
1General Description ............................................................................................................. 3
1.1 Kit Content ........................................................................................................................... 3
2Getting Started..................................................................................................................... 3
2.1 Adapter Board Pin-Out......................................................................................................... 3
2.2 Adapter Board Description................................................................................................... 4
2.3 Mechanical Setup................................................................................................................. 4
2.4 Electrical Setup.................................................................................................................... 6
2.4.1 Incremental Mode ................................................................................................................ 6
2.4.2 Pushbutton Detection........................................................................................................... 6
2.4.3 I2C Mode .............................................................................................................................. 7
3AS5601 Configuration.......................................................................................................... 7
3.1 Programming the output range ............................................................................................ 7
3.2 Programming a configuration............................................................................................... 7
3.2.1 Low Power Mode ................................................................................................................. 8
3.2.2 Hysteresis ............................................................................................................................ 8
3.2.3 Output selection ................................................................................................................... 8
3.2.4 Slow Filter ............................................................................................................................ 8
3.2.5 Fast Filter ............................................................................................................................. 8
3.2.6 Watchdog............................................................................................................................. 8
4Board Schematics, Layout and BOM................................................................................... 8
4.1 Schematics........................................................................................................................... 8
4.2 Layout and Board Dimensions............................................................................................. 9
4.3 Bill of Materials..................................................................................................................... 9
5Evaluation tools.................................................................................................................. 10
6Ordering Information.......................................................................................................... 10
Copyright ........................................................................................................................................... 11
Disclaimer..........................................................................................................................................11
Revision History
Revision
Date
Owner
Description
1.0
30.06.2014
rph
Initial Revision

AS5601-SO_RD_ST
Operation Manual
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1 General Description
The reference design allows an easy and fast evaluation of the AS5601 rotary magnetic position
sensor in the lab. Additionally it is possible to replace an existing contactless rotary knob with the
AS5601-SO_RD_ST. The module is fully assembled with and pcb including the AS5601 position
sensor and its necessary external components. All relevant signals are available on a 7-way
connector and can be easily wired to an existing application.
The AS5601 is an easy-to-program magnetic rotary position sensor with incremental quadrature
(A/B) and 12-bit digital outputs. Additionally, the PUSH output indicates fast air gap changes
between the AS5601 and magnet which can be used to implement a contactless pushbutton
function in which the knob can be pressed to move the magnet toward the AS5601.
Based on planar Hall technology, this device measures the orthogonal component of the flux
density (Bz) from an external magnet while rejecting stray magnetic fields.
The I²C interface is used for configuration and user programming of non-volatile parameters in the
AS5601 without requiring a dedicated programmer.
1.1 Kit Content
This kit contains following material listed in Table 1. Additional material can be found on our
webpage.
Table 1:
Kit Content
No.
Item
Description
Info
1
AS5601-SO_RD_ST
Reference Module including PCB
2
Quick Start Guide
2 Getting Started
The AS5601 reference design is a contactless rotary knob with 16 mechanical positions and a
pushbutton detection. It can be programmed over I2C.
Note: The AS5601 is configured for a 16 positions grid and for the modules zero position.
2.1 Adapter Board Pin-Out
The pin-out of the reference module pcb is shown in Table 2. For additional information on the
AS5601 pins refer to the product datasheet.

AS5601-SO_RD_ST
Operation Manual
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Table 2:
Adapter Board Pin-Out (J1)
Pin
Symbol
Description
Info
1
VDD
Positive Power Supply
2
PUSH
Output Pin
Contactless push-button output
3
A
Output Pin
Incremental output A
4
B
Output Pin
Incremental output B
5
SDA
I2C Data
6
SCL
I2C Clock
7
GND
Ground
2.2 Adapter Board Description
The AS5601 is connected over the 7-way header. Connect the desired pins of the AS5601 using
the headers and resistors.
Figure 1:
AS5601-SO_RD_ST PCB Description
2.3 Mechanical Setup
The contactless potentiometer reference design comes with the AS5601-SO_RD_ST PCB
assembled. The PCB holds all necessary components to operate the AS5601 in a contactless
potentiometer application with additional Pushbutton Detection.
The set-up of the module is shown below.
Short J1
to operate
in 3.3V
mode
7-Way Header

AS5601-SO_RD_ST
Operation Manual
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Figure 2:
Module set-up
The configuration of the reference module is shown in
Figure 3.
Figure 3:
Module Cross-Section
Sensor Magnet
AS5601
PCB
Push Magnet

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Operation Manual
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The magnet is already aligned to get AGC values in the middle of the AGC range.
Note: If the magnetic field seen by the AS5601 would be below 8mT, the output is disconnected
and permanent angle programming would not be possible. The AB quadrature interface is not
updated as long as the magnet is away.
2.4 Electrical Setup
The reference module is many used in following configurations and can be supplied with 5V or in
3.3V mode. Use J1 to enable the 3.3V mode.
2.4.1 Incremental Mode
In this mode, the power supply and the pins A and B of the reference module are connected. Over
Programming interface the Zero position and the resolution can be configured for better
performance due to hardly any individual application.
Figure 4:
Using the board in incremental Mode
2.4.2 Pushbutton Detection
In this mode, the power supply and the pin Push of the reference module are connected. Over the
programming interface the pushbutton detection can be adjusted.
Figure 5:
Using the board in push button mode
µC
+
-
B
A
µC
+
-
Push

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Operation Manual
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2.4.3 I2C Mode
Using the I²C Interface, all functions of the AS5601 can be configured and permanently
programmed. Additionally the output and a raw angle (unmodified value) can be read from the
output registers.
Figure 6:
Using the reference module in I2C Mode
3 AS5601 Configuration
All options to configure the AS5601 are shown below. The AS5601 operates with a default
configuration if no configuration was programmed.
3.1 Programming the output range
To adjust a custom angle to the full output range or to modify the Zero Position of the device, the
AS5601 must be programmed. Following options are available:
Programming start and stop position with I2C (Option A)
Programming an angular excursion with I2C (Option B)
Follow the step-by-step instructions in the AS5601 datasheet for one of the above programming
options.
3.2 Programming a configuration
A configuration must be written using the I2C interface. The Burn Setting command (Write 0x40 into
register 0xFF) can be used to permanently program a configuration.
µC
+
-
SDA
SCL

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Operation Manual
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3.2.1 Low Power Mode
Three low power modes are available to reduce the power consumption down to 1,5mA max.
3.2.2 Hysteresis
A 1 to 3 LSB hysteresis of the 12-bit resolution can be enabled.
3.2.3 Output selection
Per default, the Analog Output is active if a magnet is present. Additionally the Output Pin can be
switched to PWM with the option to select a PWM frequency (115Hz,230Hz,460Hz,920Hz)
3.2.4 Slow Filter
The slow filter allows improving the output noise. The default setting for the Slow Filter is 16x and
can be reduced for faster response.
3.2.5 Fast Filter
The fast filter is active by selecting a Fast Filter Threshold. If the output value remains below the
threshold, the output noise is defined by the slow filter setting. When exceeding the threshold, the
output noise is defined from the fast filter for fast output response. The output noise is again defined
by the slow filter as soon as the output stays in the threshold again.
3.2.6 Watchdog
If the watchdog is active, the AS5601 automatically enters Low Power Mode 3 after one minute if
the output value stays within a threshold of 4 LSB.
4 Board Schematics, Layout and BOM
The schematic, layout and BOM of the adapter board are shown below for reference.
4.1 Schematics
The schematic of the board is shown below in Figure 7.
Figure 7:
Reference Module PCB Schematic

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Operation Manual
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4.2 Layout and Board Dimensions
The PCB layout is shown below in Figure 8.
Figure 8:
Reference Module PCB layout
4.3 Bill of Materials
The BOM of the pcb is below in Table 3.
Table 3:
Bill of Materials
Designator
Part
Footprint
Manufact
urer
Comment
J1
Picoblade 7 Pin
Picoblade 7 Pin
R1
Resistor / not populated
R0603
C1
C0603
0603
C2
C0805
0805
TVS1
SP0504BAHT
SP0504BAHT-SOT23

AS5601-SO_RD_ST
Operation Manual
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Designator
Part
Footprint
Manufact
urer
Comment
TVS2
SP0502BAHT
SP0502BAHT-SOT23
U1
AS5601
SOIC-8
amsAB
Smart Potentiometer IC
5 Evaluation tools
To configure the AS5601, no dedicated programmer is needed. For fast setup time the USB I&P
Box can be used to configure the AS5601 over I2C. The USB I&P Box can be ordered from the ams
webpage.
Please find the ordering information below in Table 4.
Table 4:
Ordering Information for Evaluation Tools
Ordering Code
Description
Image
USB I&P Box
To configure the AS5601
6 Ordering Information
Please find the ordering information below in Table 5.
Table 5:
Ordering Information
Ordering Code
Description
Comments
AS5601-SO_RD_ST
AS5601 Reference Module
For rapid evaluation and prototyping
Get additional support material online at http://www.ams.com/AS5601.