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전자부품 데이터시트 검색엔진 |
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KMA210 데이터시트(PDF) 4 Page - NXP Semiconductors |
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KMA210 데이터시트(HTML) 4 Page - NXP Semiconductors |
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4 / 37 page  KMA210 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 2 — 7 December 2011 4 of 37 NXP Semiconductors KMA210 Programmable angle sensor 5. Functional description The KMA210 amplifies two orthogonal differential signals from MR sensor bridges and converts them into the digital domain. The angle is calculated using the COordinate Rotation DIgital Computer (CORDIC) algorithm. After a digital-to-analog conversion the analog signal is provided to the output as a linear representation of the angular value. Zero angle, clamping voltages and angular range are programmable. In addition, two 16-bit registers are available for customer purposes, such as sample identification. The KMA210 comprises a Cyclic Redundancy Check (CRC) and an Error Detection and Correction (EDC), as well as magnet-loss and broken bond wire detection to ensure a fail-safe operation. A power-loss detection circuit pulls the analog output to the remaining connection, if either the supply voltage or the ground line of the mixed signal IC is interrupted. After multiplexing the two MR Wheatstone bridge signals and their successive amplification, the signal is converted into the digital domain by an Analog-to-Digital Converter (ADC). Further processing is done within an on-chip state machine. This includes offset cancellation, calculation of the mechanical angle using the CORDIC algorithm, as well as zero angle and angular range adjustment. The internal Digital-to-Analog Converter (DAC) and the analog output stage are used for conversion of the angle information into an analog output voltage, which is ratiometric to the supply voltage. The configuration parameters are stored in a user-programmable non-volatile memory. The OWI (accessible using pin OUT/DATA) is used for accessing the memory. In order to protect the memory content a lock bit can be set. After locking the non-volatile memory, its content cannot be changed anymore. 5.1 Angular measurement directions The differential signals of the MR sensor bridges depend only on the direction of the external magnetic field strength Hext, which is applied parallel to the plane of the sensor. In order to obtain a correct output signal, the minimum saturation field strength has to be exceeded. |
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