MLX90316_05 Datasheet, PDF (7/34 Pages) List of Unclassifed Manufacturers – Rotary Position Sensor IC

MLX90316
Rotary Position Sensor IC
400
300
200
100
0
-100
-200
-300
-400
0
90
180 270 360 450 540 630 720
Alpha (Degree)
BX
BY
Figure 4 − Magnetic Flux Density − B_X ∝ cos(α) & B_Y ∝ sin(α)
2000
1500
1000
500
0
-500
-1000
-1500
-2000
0
90
180 270 360 450 540 630 720
Alpha (Degree)
VX
VY
Figure 5 − Tria⊗is™ sensor front-end − Output signals − V_X ∝ B_X ∝ cos(α) & V_Y ∝ B_Y ∝ sin(α)
Those Hall signals are processed through a fully differential analog chain featuring the classic offset
cancellation technique (Hall plate quadrature spinning and chopper-stabilized amplifier).
The conditioned analog signals are converted through an ADC (configurable − 14 or 15 bits) and provided
to a DSP block for further processing. The DSP stage is based on a 16 bit RISC micro-controller whose
primary function is the extraction of the angular position from the two raw signals (after so-called front-end
compensation steps) through the following operation:
3901090316
Rev. 001
α = ATAN ^VY
V_X
Page 7 of 34
Data Sheet
4 October 05