M410512 [MPS]
Rotary Knob Kit for the MagAlpha;
| 型号： | M410512 |
| 厂家： | 
MONOLITHIC POWER SYSTEMS |
| 描述： | Rotary Knob Kit for the MagAlpha |
| 文件： | 总8页 (文件大小：708K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
EVKT-KNOB
DESCRIPTION
FEATURES
The EVKT-KNOB is an evaluation kit for the
MagAlpha magnetic position sensor family. The
EVKT-KNOB allows users to run and test the
MagAlpha sensor quickly. It is delivered
assembled with a knob and magnet. The sensor
is mounted in an end-of-shaft configuration.
Ready-to-Use Knob with End-of-Shaft
Magnet
Extra Spacers
Compatible with MagAlpha Communication
Interface Kit (EVKT-MACOM)
APPLICATIONS
The EVKT-KNOB is compatible with the
MACOM kit, offering seamless connection and
operation of the MagAlpha and allowing users to
Knobs
Potentiometer Replacements
Dials
Appliances
evaluate
MagAlpha
functionalities
and
performances, such as noise level, refresh rate,
power-up time, magnetic field dependence, and
more.
Consumer Goods
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance. “MPS”,
the MPS logo, and “Simple, Easy Solutions” are registered trademarks of
Monolithic Power Systems, Inc. or its subsidiaries.
OVERVIEW
Figure 1: EVKT-KNOB
EVKT-KNOB Rev. 1.0
4/2/2019
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Board Type
Different board types are available, and each has a different schematic and layout design. Which board
type should be used is determined by the selected sensor part number.
Table 1: Board Type
Kit Part Number
EVKT800-KNOB
EVKT820-KNOB
EVKT850-KNOB
Board Part Number
EVMA800-Q-01A
EVMA820-Q-01A
EVMA850-Q-01A
MPS Chip Part Number
MA800
MA820
MA850
EVKT-KNOB Content
Figure 2: Kit Contents
1. EVMA board with MagAlpha mounted
2. 0.7mm and 2.0mm spacers
3. Knob with magnet
4. Extra cylinder magnet, NdFeB N35 D = 5mm, H = 2.5mm (not shown)
EVKT-KNOB Rev. 1.0
4/2/2019
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Figure 2: Board Overview Type 2
Schematic
+3.3V
C1
1µF
C2
Optional
100nF
U1
MGH
MGL
13
16
11
VDD
N/C
MGH
MGL
CN1
14
+3.3V
1
MISO
MOSI
SCLK
CS
2
4
IO1
IO2
IO3
IO4
IO5
IO6
CS
7
4
1
2
MISO
MOSI
SCLK
CS
IO1
IO2
IO3
IO4
IO5
IO6
3
5
SCLK
MOSI
MGL
MGH
IO1
TEST
6
MISO
7
12
5
3
6
8
9
10
12
14
16
IO6
IO5
IO2
11
13
15
9
IO4
IO3
15
PAD: N/C or
tied to GND
17
8
PAD
GND
TEST
10
TEST
Figure 3: Schematic Type 2
Bill of Materials
Table 2: Bill of Materials Type 2
Quantity Designator
Description
Value
Manufacturer
Manufacturer PN
Ceramic capacitor, 16V,
X7R, 0603
Ceramic capacitor, 25V,
X7R, 0603
MagAlpha magnetic position
sensor
1
1
1
C1
1µF
Murata
GRM188R71C105MA12D
GRM188R71E104MA01D
C2 (not
populated)
100nF
MAxxx
Murata
MPS
U1
16 position receptacle
connector 0.100" (2.54mm)
surface-mount tin
Würth Elektronik
or
TE Connectivity
690367281676
or
8-2178711-6
1
CN1
EVKT-KNOB Rev. 1.0
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© 2019 MPS. All Rights Reserved.
Assembly View
Figure 4: Assembly View Type 2
Mechanical Drawing
Figure 5: Mechanical Drawing Type 2
EVKT-KNOB Rev. 1.0
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Connector Pin Out
Figure 6: Connector Pin Out Type 2
Table 3: Connector Pin Mapping Type 2
Pin
CN1.1
Name
VDD
Description
3.3V supply.
CN1.2
GND
Ground.
CN1.3
CN1.4
CN1.5
CN1.6
CN1.7
CN1.8
CS
Chip select (serial).
Clock (serial).
Test pin.
Master out slave in (serial).
Master in slave out (serial).
Magnetic level low (option).
SCLK
TEST
MOSI
MISO
MGL (2)
CN1.9
CN1.10
CN1.11
CN1.12
CN1.13
CN1.14
CN1.15
CN1.16
NOTES:
MGH (2)
IO6 (3)
IO1 (3)
IO5 (3)
IO4 (3)
IO2 (3)
IO3 (3)
Magnetic level high (option).
Pin 15 (IO).
Pin 1 (IO).
Pin 9 (IO).
Pin 6 (IO).
Pin 2 (IO).
Pin 3 (IO).
1) The availability of this option depends of the chip part ID. Please refer to the part datasheet directly.
2) Please refer to the chip datasheet directly to know which feature is available on this pin.
EVKT-KNOB Rev. 1.0
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5
MAGNETIC FIELD
An NdFeB cylinder magnet is mounted at the end of the aluminum shaft.
Table 4: Magnet Characteristics
Material
Remanence (Br)
Diameter
NdFeB (N35 or N35H)
1.2T
5mm
Height
2.5mm
Magnetization
Diametrical
How to Change the Mechanical Zero
Unscrew the knob with a 1/16-inch hex key (Allen wrench). Hold the shaft with a pin inserted in the 2mm
diameter hole, and rotate the knob to the desired position. When tightening the screw, ensure that the
key is fully inserted. Note that the zero position can also be adjusted through programming, as described
in the MagAlpha datasheet.
Figure 7: Adjusting the Magnet Angular Position
How to Change the Magnetic Field Amplitude
The performance of the MagAlpha remains the same from 75mT to 150mT and higher (the MagAlpha
has no maximum operating field). The critical region is the lower end of the specified range. Some
parameters (e.g. noise, linearity) deteriorate gradually when the magnetic field becomes weak. The two
spacers enclosed in this evaluation kit allow the sensor (the noise level in particular) to be tested at low
magnetic fields.
Figure 8: Magnetic Field vs. Air Gap for the Supplied Magnet
EVKT-KNOB Rev. 1.0
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The EVMA nominal magnet sensor distance is 1.5mm, providing a magnetic field of 75mT. With the
spacers, the field strength is reduced to 50mT or 25mT (see Table 5).
Table 5: Setting of the Air Gap
Spacer Thickness (mm)
Air Gap (mm)
Magnetic Field (mT)
None
0.7
2
1.5
2.2
3.5
75
50
25
Figure 9: Air Gap Setting
MAGNET SUPPLIERS
The table below shows a non-exhaustive list of possible magnet suppliers. The magnetization direction
must be chosen carefully given the fact that most magnets sold are axially magnetized, which is not a
magnetization direction usually required in magnetic angle-sensing applications. Angle-sensing
applications usually use diametrically magnetized magnets.
Table 6: Magnet Suppliers
Company
Website
Address
Industriestrasse 8
8627 Grüningen
Switzerland
Maurer Magnetics AG
www.maurermagnetic.ch
Hübelacherstrasse 15
5242 Birr-Lupfig
Switzerland
Arnold Technologies AG
Bomatec AG
www.arnoldmagnetics.com
www.bomatec.com
Hofstrasse 1
8181 Höri
Switzerland
1050 Morse Avenue
Elk Grove Village, IL 60007-5110
USA
Dexter Magnetic Technologies
www.dextermag.com
8 LongWan Road
Jiangmen City
GuangDong Province
China
JPMF
www.jpmf.com.cn
Unit 612 Yuanzhong Building
No. 1905 Hongmei Road
Shanghai
Binicmagnet
www.binicmagnet.com
P. R. China 200233
Room 705, Tower A Century Holiday Plaza
9030 Shennan Road
Nanshan District
Shenzhen
China Rare Earth Magnet
www.permanentmagnet.com
www.goudsmit-magnetics.nl
China
Petunialaan 19
5582 HA Waalre
Netherlands
Goudsmit Magnetic Systems
EVKT-KNOB Rev. 1.0
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Maurer Magnetic
Maurer Magnetic has a selection of diametrically magnetized magnets well-suited for contactless rotary
angle applications. Samples of the types mentioned below should always be available with no lead time.
Figure 11: Ring Magnet,
Diametrically Magnetized
Figure 10: Cylinder Magnet,
Diametrically Magnetized
Table 7: Maurer Magnetic Diametrically Magnetized Magnets
OD (mm) ID (mm) H (mm)
Material
Remanence (Br) (T)
Magnetization
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Diametrical
Part Number
M610403
M410403
M610502
M410502
M610512
M410512
M610602
M410602
M610612
M410612
M610613
M410613
M610802
M410802
4.0
4.0
5.0
5.0
5.0
5.0
6.0
6.0
6.0
6.0
6.0
6.0
8.0
8.0
-
3.0
3.0
2.5
2.5
2.5
2.5
2.5
2.5
2.5
2.5
3.0
3.0
2.5
2.5
N35
Sm26/16-17
N35
1.2
1.08
1.2
-
-
-
Sm26/16-17
N35
1.08
1.2
1.25
1.25
-
Sm26/16-17
N35
1.08
1.2
-
Sm26/16-17
N35
1.08
1.2
1.5
1.5
1.5
1.5
-
Sm26/16-17
N35
1.08
1.2
Sm26/16-17
N35
1.08
1.2
-
Sm26/16-17
1.08
NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third-party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EVKT-KNOB Rev. 1.0
4/2/2019
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
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