MLX90364 Datasheet, PDF (23/36 Pages) Melexis Microelectronic Systems – Triaxis® Position Sensor Assembly

MLX90364
Triaxis® Position Sensor Assembly
1 – 01b
2 – 10b
3 – 11b
Note: MAPXYZ = 3 is not recommended.
Zx
X
XZx mode
Y
Zx
YZx mode
Y
Zy
YZy mode
15.5.2. 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 overwrite it for optimal
performances.
(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). If the mapping (B1=X, B2=Y) is selected, this
parameter is unused.
This parameter is optimized for MAPXYZ=01 (B1=Z, B2=X) by factory trimming. If another mapping value
is selected, Melexis recommends to fine tune K in order to reach a smaller linearity error (Le, see section
10).
(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.
15.5.3. GAINMIN and GAINMAX Parameters
GAINMIN and GAINMAX parameters define the boundaries of the virtual gain code. Outside of these
thresholds, the “GAIN out of Spec” fault is set.
If GAINSATURATION parameter is set, the virtual gain code is saturated at GAINMIN and GAINMAX, and
no Diagnostic fault is set since the saturations applies before diagnostic check.
15.6. Filter
Parameter
FILTER
FHYST
Value
0…2
0 … 255
The MLX90364 includes 2 types of filters:
• Hysteresis Filter: programmable by the FHYST parameter
• Low Pass FIR Filters controlled with the FILTER parameter
15.6.1. Hysteresis Filter
The FHYST parameter is a hysteresis filter. The output value of the IC is not updated when the digital step
is smaller than the programmed FHYST parameter value. The output value is modified when the
MLX90364
Rev 4.1
Page 23 of 36
Datasheet
19/11/2015