KMA220 datasheet(6/36 Pages) NXP

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KMA220

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Product data sheet

Rev. 1 — 24 May 2012

6 of 36

NXP Semiconductors

KMA220

Dual channel programmable angle sensor

Diagnostic features

Each channel provides several diagnostic features:

7.1 CRC and EDC supervision

Each channel of the KMA220 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, each channel of the KMA220 can

raise a diagnostic condition. In order to enter the diagnostic mode, due to magnet-loss,

enable the detection first. Both channels can be programmed independently 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 each analog output

001aag811

αrng

αref

αmax

αsw(CL)

αref + 180°

α (deg)

180

(%VDD)

V(CL)u

V(CL)I

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