Datasheet

MLX90640 32x24 IR array
Datasheet
Page 53 of 60
REVISION 11 – 4 MAY 2018
13. Application information
13.1.
13.1.13.1.
13.1. Electrical considerations
Electrical considerationsElectrical considerations
Electrical considerations
Figure 26 MLX90640 electrical connections
As the MLX90640Bxx is fully I2C compatible it allows to have a system in which the MCU may be supplied with VDD=2.6V…5V
while the sensor it’s self is supplied from separate supply VDD1=3.3V (or even left with no supply i.e. VDD=0V), with the I2C
connection running at supply voltage of the MCU.
13.2.
13.2.13.2.
13.2. Using the device in “image
Using the device in “image Using the device in “image
Using the device in “image mode”
mode” mode”
mode”
In some applications may not be necessary to calculate the temperature but rather to have just and image (for
instance in machine vision systems). In this case it is not necessary to carry out all calculations which would save
computation time or allow the one to use weaker CPU.
In order to get thermal image only following computation flow is to be used:
Supply voltage value calculation (common for all pixels) - 11.2.2.2