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KMA221 Scheda tecnica(PDF) 5 Page - NXP Semiconductors |
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KMA221 Scheda tecnica(HTML) 5 Page - NXP Semiconductors |
5 / 36 page KMA221 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2013. All rights reserved. Product data sheet Rev. 1 — 16 July 2013 5 of 36 NXP Semiconductors KMA221 Programmable angle sensor Since the Anisotropic MR (AMR) effect is periodic over 180 , the sensor output is also 180 -periodic. The angle is calculated relative to a freely programmable zero angle. The dashed line indicates the mechanical zero degree position. 6. Analog output The KMA221 provides one analog output signal on pin OUT/DATA. The measured angle is converted linearly into a value, which is ratiometric to the supply voltage V DD. Either a positive or a negative slope is provided for this purpose. Table 3 describes the analog output behavior for a positive slope. For example, if a magnetic field angle, above the programmed maximum angle max but below the clamp switch angle sw(CL), is applied to the sensor, the analog output is set to the upper clamping voltage. If the magnetic field angle is larger than the clamp switch angle, the analog output switches from upper to lower clamping voltage. If there is a negative slope, the clamping voltages are changed. The analog output voltage range encodes both angular and diagnostic information. A valid angle value is between the upper and lower clamping voltage. If the analog output is in the diagnostic range, that is below 4 %VDD or above 96 %VDD, an error condition has been detected. The analog output repeats every 180 . Fig 2. Angular measurement directions 008aaa276 α Hext 4 3 2 1 Table 3. Analog output behavior for a positive slope Magnetic field angle Analog output max < < sw(CL) V(CL)u sw(CL) < < ref + 180 V(CL)l |
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