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KMA221 Datasheet(PDF) 6 Page - NXP Semiconductors |
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KMA221 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 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 6 of 36 NXP Semiconductors KMA221 Programmable angle sensor 7. Diagnostic features The KMA221 provides several diagnostic features: 7.1 CRC and EDC supervision The KMA221 includes a supervision of the programmed data. At power-on, a CRC of the non-volatile memory is performed. Furthermore the memory is protected against bit errors. Every 16-bit data word is saved internally as a 22-bit word for this purpose. The protection logic corrects any single-bit error in a data word, while the sensor continues in normal operation mode. Furthermore the logic detects double-bit error per word and switches the output into diagnostic mode. 7.2 Magnet-loss detection If the applied magnetic field strength is not sufficient, the KMA221 can raise a diagnostic condition. In order to enter the diagnostic mode, due to magnet-loss, enable the detection first. The device can be programmed into active diagnostic mode, where the output is driven below 4 %VDD or above 96 %VDD. 7.3 Power-loss detection The power-loss detection circuit enables the detection of an interrupted supply or ground line of the mixed signal IC. If there is a power-loss condition, two internal switches in the sensor are closed, connecting the pin of the analog output to the supply voltage and the ground pins. max = ref + rng Fig 3. Characteristic of the analog output 001aag811 αrng 0 αref αmax αsw(CL) αref + 180° α (deg) 180 VO (%VDD) V(CL)u V(CL)I |
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