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KMA200 Datasheet(PDF) 6 Page - NXP Semiconductors

Part # KMA200
Description  Programmable angle sensor
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Manufacturer  PHILIPS [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

KMA200 Datasheet(HTML) 6 Page - NXP Semiconductors

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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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