MLX90366

Triaxis



Position Sensor Assembly feat. SENT

MLX90366

Page 24 of 34

Datasheet

Rev. 1.0

25/Jun/13

14.3.1. MAPXYZ

The MAPXYZ parameter defines which fields are used to calculate the angle. The different possibilities

are described in the tables below.

This 2 bit value selects the first (B1) and second (B2) field components according the table below.

MAPXYZ

B1

B2

Angular

0 – 00b

X

Y

XY mode

1 – 01b

Zx

X

XZx mode

2 – 10b

Y

Zx

YZx mode

3 – 11b

Y

Zy

YZy mode

MAPXYZ = 3 is not recommended.

14.3.2. SMISM, k and SEL_k Parameters

(i) SMISM

When the mapping (B1=X, B2=Y) is selected, SMSIM defines the sensitivity mismatch factor that is

applied on B1, B2; When another B1, B2 mapping is selected, this parameter is

“don’t care”.

This parameter is trimmed at factory; Melexis strongly recommends TO NOT over write it for optimal

performance.

(ii) k

When the mapping (B1=X, B2=Y) is NOT selected, k defines the sensitivity mismatch factor that is applied

on B1or B2 (according to parameter SEL_k

– see below). When the mapping (B1=X, B2=Y) is selected,

this parameter is

“don’t care”.

This parameter is trimmed at factory for mapping (B1=Z, B2=X). Melexis recommends to fine trim it when

a smaller linearity error (Le) is required and a different mapping than (B1=X, B2=Y) is selected.

(iii) SEL_k

When the mapping (B1=X, B2=Y) is NOT selected, SEL_k defines the component on which the sensitivity

mismatch factor k (see above): SEL_k = 0 means B1

 k  B1 and SEL_k = 1 means B2  k  B2.

14.3.3. GAINMIN and GAINMAX Parameters

GAINMIN and GAINMAX define the thresholds on the gain code outside which the fault “GAIN out of

Spec.” is set;

If GAINSATURATION is set, then the virtual gain code is saturated at GAINMIN and GAINMAX, and no

Diagnostic fault is set since the saturations apply before the Diagnostic check.