EVKT820-KNOB-Q-01A

EVKT-KNOB Rotary Knob Kit for the MagAlpha 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.  The EVKT-KNOB is compatible with the MACOM kit, offering seamless connection and operation of the MagAlpha and allowing users to evaluate MagAlpha functionalities and performances, such as noise level, refresh rate, power-up time, magnetic field dependence, and more.   Ready-to-Use Knob with End-of-Shaft Magnet Extra Spacers Compatible with MagAlpha Communication Interface Kit (EVKT-MACOM) APPLICATIONS      Knobs Potentiometer Replacements Dials Appliances 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 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 1 EVKT-KNOB – ROTARY KNOB KIT FOR THE MAGALPHA 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. 2. 3. 4. EVMA board with MagAlpha mounted 0.7mm and 2.0mm spacers Knob with magnet Extra cylinder magnet, NdFeB N35 D = 5mm, H = 2.5mm (not shown) EVKT-KNOB Rev. 1.0 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 2 EVKT-KNOB – ROTARY KNOB KIT FOR THE MAGALPHA Figure 2: Board Overview Type 2 Schematic +3.3V C1 1µF C2 100nF Optional U1 13 14 MISO MOSI SCLK CS PAD: N/C or tied to GND 7 4 12 5 17 8 VDD N/C MISO MOSI SCLK CS PAD GND MGH MGL MGH MGL 16 IO1 IO2 IO3 IO4 IO5 IO6 1 15 IO1 IO2 IO3 IO4 IO5 IO6 TEST 10 TEST 11 2 3 6 9 CN1 SCLK MOSI MGL MGH IO1 IO4 IO3 2 4 6 8 10 12 14 16 1 3 5 7 9 11 13 15 +3.3V CS TEST MISO IO6 IO5 IO2 Figure 3: Schematic Type 2 Bill of Materials Table 2: Bill of Materials Type 2 Quantity Designator 1 C1 1 C2 (not populated) 1 U1 1 CN1 Description Ceramic capacitor, 16V, X7R, 0603 Ceramic capacitor, 25V, X7R, 0603 MagAlpha magnetic position sensor 16 position receptacle connector 0.100" (2.54mm) surface-mount tin Value Manufacturer Manufacturer PN 1µF Murata GRM188R71C105MA12D 100nF Murata GRM188R71E104MA01D MAxxx MPS Würth Elektronik or TE Connectivity 690367281676 or 8-2178711-6 EVKT-KNOB Rev. 1.0 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 3 EVKT-KNOB – ROTARY KNOB KIT FOR THE MAGALPHA Assembly View Figure 4: Assembly View Type 2 Mechanical Drawing Figure 5: Mechanical Drawing Type 2 EVKT-KNOB Rev. 1.0 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 4 EVKT-KNOB – ROTARY KNOB KIT FOR THE MAGALPHA Connector Pin Out Figure 6: Connector Pin Out Type 2 Pin CN1.1 CN1.2 CN1.3 CN1.4 CN1.5 CN1.6 CN1.7 CN1.8 CN1.9 CN1.10 CN1.11 CN1.12 CN1.13 CN1.14 CN1.15 CN1.16 Name VDD GND CS SCLK TEST MOSI MISO MGL (2) MGH (2) IO6 (3) IO1 (3) IO5 (3) IO4 (3) IO2 (3) IO3 (3) Table 3: Connector Pin Mapping Type 2 Description 3.3V supply. Ground. Chip select (serial). Clock (serial). Test pin. Master out slave in (serial). Master in slave out (serial). Magnetic level low (option). Magnetic level high (option). Pin 15 (IO). Pin 1 (IO). Pin 9 (IO). Pin 6 (IO). Pin 2 (IO). Pin 3 (IO). NOTES: 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 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 5 EVKT-KNOB – ROTARY KNOB KIT FOR THE MAGALPHA MAGNETIC FIELD An NdFeB cylinder magnet is mounted at the end of the aluminum shaft. Table 4: Magnet Characteristics NdFeB (N35 or N35H) Material 1.2T Remanence (Br) 5mm Diameter 2.5mm Height Diametrical Magnetization 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 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 6 EVKT-KNOB – ROTARY KNOB KIT FOR THE MAGALPHA 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) None 1.5 0.7 2.2 2 3.5 Magnetic Field (mT) 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 Maurer Magnetics AG www.maurermagnetic.ch Industriestrasse 8 8627 Grüningen Switzerland Arnold Technologies AG www.arnoldmagnetics.com Hübelacherstrasse 15 5242 Birr-Lupfig Switzerland Bomatec AG www.bomatec.com Hofstrasse 1 8181 Höri Switzerland Dexter Magnetic Technologies www.dextermag.com 1050 Morse Avenue Elk Grove Village, IL 60007-5110 USA JPMF www.jpmf.com.cn 8 LongWan Road Jiangmen City GuangDong Province China www.binicmagnet.com Unit 612 Yuanzhong Building No. 1905 Hongmei Road Shanghai P. R. China 200233 China Rare Earth Magnet www.permanentmagnet.com Room 705, Tower A Century Holiday Plaza 9030 Shennan Road Nanshan District Shenzhen China Goudsmit Magnetic Systems www.goudsmit-magnetics.nl Petunialaan 19 5582 HA Waalre Netherlands Binicmagnet EVKT-KNOB Rev. 1.0 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 7 EVKT-KNOB – ROTARY KNOB KIT FOR THE MAGALPHA 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) 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 1.25 1.25 1.5 1.5 1.5 1.5 - H (mm) Material Remanence (Br) (T) Magnetization Part Number 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 Sm26/16-17 N35 Sm26/16-17 N35 Sm26/16-17 N35 Sm26/16-17 N35 Sm26/16-17 N35 Sm26/16-17 1.2 1.08 1.2 1.08 1.2 1.08 1.2 1.08 1.2 1.08 1.2 1.08 1.2 1.08 Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical Diametrical M610403 M410403 M610502 M410502 M610512 M410512 M610602 M410602 M610612 M410612 M610613 M410613 M610802 M410802 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 MonolithicPower.com 4/2/2019 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2019 MPS. All Rights Reserved. 8