KMA220
NXP Semiconductors
Dual channel programmable angle sensor
V
O
)
(%V
α
rng
DD
V
(CL)u
V
(CL)I
α (deg)
0
α
α
ref
max
α
180
sw(CL)
α
ref
+ 180°
001aag811
max = ref + rng
Fig 3. Characteristic of each analog output
7. 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.
KMA220
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 24 May 2012
6 of 36
NXP [ NXP ]
