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KMA200 데이터시트(PDF) 5 Page - NXP Semiconductors |
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KMA200 데이터시트(HTML) 5 Page - NXP Semiconductors |
5 / 31 page 9397 750 11399 © Koninklijke Philips Electronics N.V. 2005. All rights reserved. Product data sheet Rev. 05 — 16 August 2005 5 of 31 Philips Semiconductors KMA200 Programmable angle sensor 6. Diagnosis features The KMA200 includes diagnostic features to ensure the validity of its output signals. The diagnostic features can be configured with the control information words (ctrl) written to the user-programmable EEPROM. In the analog output modes a diagnostic error condition is signaled to the user by setting the outputs into the high-impedance state. The outputs are forced to lie in the upper or lower diagnostic range by external pull-up or pull-down resistors. With no external pull-up/pull-down resistors the output signal will be internally pulled up to upper diagnosis range. If digital output is selected, an error condition can also be signaled by setting the error flag in the digital output word. The least significant bits show the error code. The Table 4 shows the behavior in detail: Once a diagnostic error condition is reached, the KMA200 continues to work normally after a new external power-on reset or by itself, as described in the table below. It is possible to configure the KMA200 the way that the error condition has to be fulfilled more than once. The number of error conditions that is necessary can also be programmed with bits in the control information words. [1] Reactivation for angular measurement with valid angle information (normal operation mode) only by new external power-on reset Temperature supervision The chip temperature measured within the KMA200 can be used to detect over-temperature conditions. Two temperature levels are defined: the temperature warning level and the temperature shutdown level. The user can evaluate the temperature warning if digital output mode is selected. When the device temperature exceeds the warning level, the error flag in the digital output word is set. The other data bits still show the angle information. In the analog output modes, the device temperature warning is not available. If the temperature exceeds the over-temperature shutdown level, the KMA200 switches off. Table 4: Summary KMA200 behavior at diagnosis conditions in normal operation mode Error appearance Analog output Digital output oscillator fail detection [1] high-impedance state [1] high-impedance state CRC [1] high-impedance state [1] diagnosis bit set watchdog [1] high-impedance state [1] high-impedance state input stage (including magnet lost) high-impedance state diagnosis bit set output stage [1] high-impedance state - over temperature warning - diagnosis bit set over temperature shut-down [1] high-impedance state [1] high-impedance state overvoltage high-impedance state high-impedance state reverse polarity high-impedance state high-impedance state |
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