Operation Manual

User Manual – AS5045B-AB-v1.0
AS5045B
12-bit Rotary Position Sensor with Digital Angle
(Interface), PWM and ABI output
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User Manual – AS5045B-AB
Table of Contents
1
General Description ............................................................................................................. 3
2
The AS5045B adapter board ............................................................................................... 3
2.1
Board description ................................................................................................................. 3
2.2
Mounting the AS5045B adapter board ................................................................................. 4
3
AS5045B adapter board and pinout ..................................................................................... 6
4
Operation cases ................................................................................................................... 8
4.1
Standalone SSI output mode ............................................................................................... 8
4.2
Standalone PWM output mode ............................................................................................ 9
4.3
Standalone incremental Output ......................................................................................... 11
4.4
Daisy chain mode ............................................................................................................... 12
5
Programming the AS5045B ............................................................................................... 13
6
AS5045B-AB-Hardware ..................................................................................................... 14
6.1
AS5045B-AB-1.0 Schematics ............................................................................................ 14
6.2
AS5045B – AB – 1.0 PCB layout ....................................................................................... 14
7
Copyright ............................................................................................................................ 15
8
Disclaimer .......................................................................................................................... 15
9
Contact Information ............................................................................................................ 15
Revision History
Revision
Date
1.0
01.10.2009
1.1
05.07.2013
www.ams.com
Owner
Description
Initial revision
azen
Updated to new template
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User Manual – AS5045B-AB
1
General Description
The AS5045B is a contactless magnetic rotary encoder for accurate angular measurement over a full
turn of 360°. It is 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. This is shown in Figure 1.
Figure 1:
Rotary Position Sensor AS5045B + Magnet
2
The AS5045B adapter board
The AS5045B adapter board is a simple circuit allowing test and evaluation of the AS5045B rotary
position sensor quickly without building a test fixture or PCB.
2.1
Board description
The PCB can be used as standalone unit or attached to a microcontroller. The standalone operation
requires a 5V power supply only; the magnet’s angle can be read on the PWM or analog output.
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User Manual – AS5045B-AB
Figure 2:
AS5045B Adapterboard
AS5045B magnetic
position sensor
J2 connector (PWM,
and status output)
J1 connector (Prg,
power supply, serial
interface)
4 x 2.6mm
mounting holes
2.2
Mounting the AS5045B adapter board
A diametric magnet must be placed over on under the AS5045B encoder, and should be centered on
the middle of the package with a tolerance of 0.5mm.
The airgap between the magnet and the encoder casing should be maintained in the range
0.5mm~2mm. The magnet holder must not be ferromagnetic. Materials as brass, copper, aluminum,
stainless steel are the best choices to make this part.
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User Manual – AS5045B-AB
Figure 3:
AS5045B – AB - mounting and dimension
Magnet
0.5~2mm
AS5045B
22mm
B
A
Mag Mag GND
DEC INC
J2
PWM Ind
5V
3V3 CSn CLK
DO GND
4x2.6mm
Diametral
Magnet
N
AS5045B
S
11mm
28mm
J1
Prg
18mm
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User Manual – AS5045B-AB
3
AS5045B adapter board and pinout
Figure 4:
AS5045B adapter board connectors and encoder pinout
B
Mag Mag GND
DEC INC
A
J2
PWM Ind
Prg
3V3
CSn CLK
DO GND
J1
5V
AS5045B-AB-1.0
AS5040
,
Table 1:
Pin description
Pin#
Pin#
Symbol
Board
AS5040
Board
JP1 - 1
7
GND
S
JP1 - 2
9
DO
DO_T
Data Output of Synchronous Serial Interface
JP1 - 3
10
CLK
DI_ST
Clock Input of Synchronous Serial Interface; Schmitt-Trigger input
JP1 - 4
11
CSn
DI_PU_ST
JP1 - 5
15
3V3
S
3V-Regulator Output
JP1 - 6
16
5V
S
5V Supply
JP1 - 7
8
Prg
DI_PD
JP2 - 1
7
GND
S
JP2 - 2
1
MagINC
DO_OD
Magnet Field Magnitude INCrease; active low, indicates a distance reduction
between the magnet and the device surface.
JP2 - 3
2
MagDEC
DO_OD
Magnet Field Magnitude DECrease; active low, indicates a distance increase
between the device and the magnet
JP2 - 4
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3
A
Type
DO
Description
Supply ground
Chip Select, active low; Schmitt-Trigger input, internal pull-up resistor (~50k)
connect to VSS in incremental mode
OTP Programming Input and Data Input for Daisy Chain mode. Internal pulldown resistor (~74k).
May be connected to VSS if programming is not used
Supply ground
AS5040 – AS5140 – AS5145 (programmed) only
Mode1.x: Quadrature A channel
Mode2.x: Least Significant Bit
Mode3.x: U signal (phase1)
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User Manual – AS5045B-AB
Pin#
Pin#
Symbol
Board
AS5040
Board
JP2 - 5
4
B
Type
Description
DO
AS5040 – AS5140 – AS5145 (programmed) only
Mode1.x: Quadrature B channel quarter period shift to channel A.
Mode2.x: Direction of Rotation
Mode3.x: V signal (phase2)
JP2 - 6
6
Ind
DO
AS5040 – AS5140 – AS5145 (programmed) only
Mode1.x and Mode2.x : Index signal indicates the absolute zero position
Mode3.x: W signal (phase3)
AS5045 – AS5145 (unprogrammed)
Mode input, connect to VDD5 (Fast mode) or GND (Slow mode); do not change
during operation
JP2 - 7
12
PWM
DO
Pulse Width Modulation of approx. 1kHz; LSB in Mode3.x
Pin types:
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DO_OD
digital output open drain
S
DI_PD
digital input pull-down
DO_T digital output /tri-state
DI_PU
digital input pull-up
ST
schmitt-trigger input
DI
digital input
DO
digital output
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supply pin
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User Manual – AS5045B-AB
4
Operation cases
The most complete and accurate solution for a MCU to read the angle of a magnet is the serial
interface.
4.1
Standalone SSI output mode
The serial word contains 12 bits for AS5045B angle value and some other indicator bits like MagINC,
MagDEC, which can be read at the same time.
Figure 5:
Using the analog output with the adapter board
MCU
VDDp
out
B
A
in
Mag Mag GND
DEC INC
J2
PWM Ind
out
Prg
5V
3V3 CSn CLK
DO GND
J1
+5V
GND
GND
Regulated
Power
Supply
OR
3.3V reg.
GND Power
Supply
+3V3
N
AS5045B
S
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User Manual – AS5045B-AB
4.2
Standalone PWM output mode
The AS5045B provides a pulse width modulated output (PWM), whose duty cycle is proportional to the
measured angle. The PWM signal (J2 pin #7) with a period of 1025us (1us step) and 5V pulse voltage
can be connected to the capture/timer input of a microcontroller in order to decode the angle value.
Figure 6:
Using the PWM output with the adapter board
MCU
VDDp
in
B
A
Mag Mag GND
DEC INC
J2
PWM Ind
Prg
5V
3V3 CSn CLK
DO GND
J1
+5V
GND
Regulated
Power
Supply
GND
N
AS5045B
S
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User Manual – AS5045B-AB
Figure 7:
PWM duty cycle depending on magnet position
Angle
PWMIN
0 deg
(Pos 0)
1µs
1025µs
PWMAX
359.65 deg
(Pos 1023)
1024µs
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User Manual – AS5045B-AB
4.3
Standalone incremental Output
Three different incremental output modes are possible with quadrature A/B being the default mode
(two-channel quadrature, step / direction incremental signal (LSB) and the direction bit in clockwise
(CW) and counter-clockwise (CCW) direction.
The pre-programmed version AS5045B provides a 12bit incremental output.
Figure 8:
Using the Incremental output with the adapter board
MCU
VDDp
in
B
A
Mag Mag GND
DEC INC
J2
PWM Ind
in
in
Prg
5V
3V3 CSn CLK
DO GND
J1
+5V
GND
Regulated
Power
Supply
GND
N
AS5045B
S
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User Manual – AS5045B-AB
4.4
Daisy chain mode
By using more than one adapter board, a setup in daisy chain mode is possible.
Note: In this mode capacitor C3 (Fig.12) must be disconnected when using the 1nF capacitor shown
in Fig.9. or directly replaced by this capacitor.
The serial data of all connected devices is read from the DO pin of the first device in the chain. The
Prog pin of the last device in the chain should be connected to VSS. The length of the serial bit stream
increases with every connected device (board) by n * (16+1) bits.
Due to R = 100R and C = 1nF, the CLK is limited the maximum 1MHz.
Figure 9:
Using Daisy-Chain mode with the adapter board
MCU
VDDp
out
in
out
+5V
Ind
B
A
Mag
DEC
GND
Mag GND
INC
Regulated
Power
Supply
J2
PWM
5V
3V3 CSn CLK
DO
GND
J1
Prg
N
AS5040
S
100R
Ind
B
A
Mag
DEC
Mag GND
INC
J2
PWM
1nF
5V
3V3 CSn CLK
DO
GND
J1
Prg
N
AS5040
S
next Board
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User Manual – AS5045B-AB
5
Programming the AS5045B
After power-on, programming the AS5045B is enabled with the rising edge of CSn with Prog = high
and CLK = low. 16 bit configuration data must be serially shifted into the OTP register via the Prog-pin.
The first “CCW” bit is followed by the zero position data (MSB first - 12 bit for AS5045B) and some
mode settings (please refer to datasheet). Data must be valid at the rising edge of CLK.
After writing data into the OTP register it can be permanently programmed by rising the Prog pin to the
programming voltage VPROG of 7.3-7.5V. 16 CLK pulses must be applied to program the fuses.
For exiting the programming mode, the chip must be reset by a power-on-reset. The programmed data
is available after the next power-up.
Figure 10:
Programming the AS5045B
MCU
VDDp
out
out
Ind
B
5V
3V3
A
Mag
DEC
Mag GND
INC
J2
PWM
out
Prg
CSn CLK
DO
GND
J1
+5V
GND
Regulated
Power
Supply
N
AS5045B
S
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User Manual – AS5045B-AB
2
6
3
AS5045B-AB-Hardware
Following the schematic and layout of the Adapterboard can be found.
6.1
AS5045B-AB-1.0 Schematics
Figure 11:
AS5045B-AB-1.0 adapterboard schematics
J2
PWM
Index
B
A
MagDECn
MagINCn
7
6
5
4
3
2
1
GND
Header 7
3.3V
5V
U1
MagINCn
MagDECn
A
B
Index
PROG
1
2
3
4
5
6
7
8
C3
MagINCn
VDD5V
MagDECn VDD3V3
A_LSB_U
nc
B_DIR_V
nc
nc
PWM_LSB
Index_W
CSn
VSS
CLK
Prog
DO
16
15
14
13
12
11
10
9
J1
C1
C2
GND
10u/10V 10u/10V
PWM
CSn
CLK
DO
GND
3.3V
5V
1
2
3
4
5
6
7
DO
CLK
CSn
PROG
AS5045B
Header 7
100n
6.2
AS5045B – AB – 1.0 PCB layout
Figure 12:
AS5045B-AB-1.0 adapter board layout
Size
Project Title
A4
ProjTitle
Date ProjDate
Originator Originator
2
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3
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User Manual – AS5045B-AB
7
Copyright
Copyright ams AG, Tobelbader Strasse 30, 8141 Unterpremstätten, Austria-Europe. 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.
8
Disclaimer
Devices sold by ams AG are covered by the warranty and patent indemnification provisions
appearing in its Term of Sale. ams AG makes no warranty, express, statutory, implied, or by
description regarding the information set forth herein. ams AG 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 ams AG for current information. This product is intended
for use in commercial applications. Applications requiring extended temperature range, unusual
environmental requirements, or high reliability applications, such as military, medical life-support or
life-sustaining equipment are specifically not recommended without additional processing by ams
AG for each application. This Product is provided by ams “AS IS” and any express or implied
warranties, including, but not limited to the implied warranties of merchantability and fitness for a
particular purpose are disclaimed.
ams AG 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 ams AG rendering of technical or other services.
9
Contact Information
Headquarters
ams AG
Tobelbader Strasse 30
8141 Unterpremstaetten
Austria
T. +43 (0) 3136 500 0
For Sales Offices, Distributors and Representatives, please visit:
http://www.ams.com/contact
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