MLX75031 Datasheet, PDF (4/67 Pages) Melexis Microelectronic Systems – Optical Gesture & Proximity Sensing IC

MLX75031
Optical Gesture & Proximity Sensing IC
with Integrated LED Drivers
Datasheet
1. Functional Block Diagram
Figure 1 : MLX75031 Functional Block Diagram
2. Device Overview
The MLX75031 Optical Gesture & Proximity Sensing IC independently controls up to 2 Active Light channels.
Both channels, A and B, have externally connected photodiodes. External LEDs can be driven up to 150 mA
by the built-in LED driver. This current drive capability can also be used to drive a low cost bipolar transistor
to increase the peak LED current. The chip synchronizes the pulsing of the LEDs and the exposure time of
the Active Light channel photodiodes whereby ambient light and reflected LED light are detected
separately. Any spurious light source is subtracted from the Active Light signal. See Section 8.1.
The two logarithmic current sensing channels C and D can be used to measure ambient light over a very
wide intensity range. See Section 8.2 for more details.
As auxiliary features, the sensor integrates a watchdog timer, can measure its own temperature, the LED
temperature, monitor voltage supply level and perform self diagnostics.
All of this information is available via the SPI interface.
See Section 8.14, 8.3, 8.5.3, 8.5.4 or 8.11.8 for detailed information.
The sensor features sleep and standby modes to save on current consumption. (Section 8.11.2)
The SPI interface is used for data transfer and control of the IC. The timing characteristics are explained in
Section 8.11.1 and the interface commands and programmable options in Section 8.11.3 & 8.13.
The sensor is available in both consumer and automotive temperature grades.
REVISION 001 – JANUARY, 2013
39010xxxxx
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