MLX75030 Datasheet, PDF (21/72 Pages) Melexis Microelectronic Systems – Universal ActiveLight Sensor Interface

MLX75030 Universal ActiveLight Sensor Interface
Datasheet
( ) r_{comp _ i} = 3 ⋅10^−5 1 − p_x
y_{comp_1}
1.285714 -0.28571 0
y_{comp_2}
-1.28571 1.714286 -0.42857
y_{comp_3}
=
0
-1.42857 1.857143
y_{comp_4}
0
0
-1.42857
y_{comp_5}
0
0
0
For the calculation example, we get the following values:
0
-1.8E-17
-0.42857
2.678571
-2.25
0
1.78E-17
-7.9E-17
-1.25
2.25
r_{comp_1}
7.68E-07
r_{comp_2}
1.73E-06
r_{comp_3}
=
2.53E-06
r_{comp_4}
3.04E-06
r_{comp_5}
3.16E-06
r_{comp_1}
r_{comp_2}
•
r_{comp_3}
r_{comp_4}
r_{comp_5}
The settings PD_COMP_ICx<3:0> (x = 1..5) can be derived from the y_{comp_x} (x = 1..5) as follows:
PD_COMP_IC1[3:0] = round (
0.4
y_{comp _1}
× 0.132
10^−6
, 0)
PD_COMP_IC2[3:0]
=
round
(
0.4
y_{comp_ 2}
× 0.165
10^−6
,
0)
PD_COMP_IC3[3:0] = round (
0.4
y_{comp _ 3}
× 0.334
10^−6
, 0)
PD_COMP_IC4[3:0] = round (
0.4
y_{comp _ 4}
× 0.334
10^−6
, 0)
PD_COMP_IC5[3:0] = round (
0.4
y_{comp _ 5}
× 0.180
10^−6
, 0)
For the calculation example, this means:
PD_COMP_IC1[3:0] = 9dec
PD_COMP_IC2[3:0] = 14dec
PD_COMP_IC3[3:0] = 7dec
PD_COMP_IC4[3:0] = 5dec
PD_COMP_IC5[3:0] = 3dec
These values can be written inside the corresponding registers, see section 7.4. When the PD compensation is enabled
(EN_PDCOMP = "1"), the compensation will modulate the LED current of the ActiveLight channels.
REVISION 005 – DECEMBER 2013
3901075030
PAGE 21 OF 72