MLX75031 Datasheet, PDF (18/67 Pages) Melexis Microelectronic Systems – Optical Gesture & Proximity Sensing IC

MLX75031
Optical Gesture & Proximity Sensing IC
with Integrated LED Drivers
Datasheet
Figure 2: Input-to-output characteristic of each ambient channel at 3 different temperatures
8.2.3. Calibration & Temperaure Compensaion
The output of each ambient channel has a strong temperature dependence and a slight process
dependence that can be compensated at run time. This is shown in following equation (channel x, x = C, D) :
( ) e I_x
= 1 + TC_Iref
∆T
1+ α

O_x
300²
∆T 

α _{}
ambout_x
T
−
2¹⁵

+
β
(1)
• I_x:
• ambout_x:
• TC_Iref:
• O_x:
• α_x, β_x:
calculated input light value
16-bit ADC converted value of the ambient channel
temperature coefficient of the reference current (typ. Value = +1230ppm/K)
offset of the internal amplifiers (digital value)
calibration values for channel x (see below)
REVISION 001 – JANUARY, 2013
39010xxxxx
Page 18 of 18