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| 型號： | KMA210 |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 振動和傾斜傳感器 |
| 英文描述： | Programmable angle sensor |
| 封裝： | KMA210<SOT1288|<<<1<Always Pb-free,; |
| 文件頁數(shù)： | 4/36頁 |
| 文件大?。?/td> | 563K |
| 代理商： | KMA210 |
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KMA210
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 1 — 30 June 2011
4 of 36
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 H
ext
, 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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