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KMA200 Datasheet(PDF) 6 Page - NXP Semiconductors |
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KMA200 Datasheet(HTML) 6 Page - NXP Semiconductors |
6 / 33 page KMA200 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Product data sheet Rev. 8 — 7 December 2011 6 of 33 NXP Semiconductors KMA200 Programmable angle sensor Diagnosis of input stage For diagnosis of the input stage, the calibration microcontroller calculates the expected signal magnitude using the temperature information and the EEPROM constants and compares it to the signal magnitude based on the current measurement. If the difference of the two magnitudes is greater than an allowed deviation, an error condition is signaled to the user. The allowed difference depends on the bits DI1 and DI0 in the EEPROM control information word. Diagnosis of output stage Both analog outputs are supervised by the auxiliary ADC which reads the present analog signal and converts it back to the digital domain with a resolution of 8 bits. The digitized value is compared to the digital angle value originally sent. If the difference of these two values is greater than an error bound, an error condition is signaled by switching off the analog outputs. The allowed difference depends on the bits DO1 and DO0 in the EEPROM control information word. CRC check of EEPROM constants During normal operation mode a CRC code of the configuration constants taken from the EEPROM is calculated on a regular basis. This code is compared to a pre-calculated CRC code from the EEPROM (CRC). If there is a mismatch, an error condition is signaled to the user by setting the error flag in the digital output word or by switching off the analog outputs. The CRC code used is the CRC-16 code (ISO/IEC 3309:1993 and ITU-T V.42) Watchdog timer The KMA200 comprises a watchdog timer to supervise the flow of the program. After reset, the watchdog is automatically activated. During operation the watchdog timer must be toggled on a regular basis, as otherwise the error condition is signaled. The access to the watchdog timer is protected against unwanted operations using a fail-safe watchdog feed sequence. |
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