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KMA221 Datasheet(PDF) 6 Page - NXP Semiconductors

Part # KMA221
Description  Programmable angle sensor
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

KMA221 Datasheet(HTML) 6 Page - NXP Semiconductors

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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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