Data Sheet
MLX90640 32x24 IR array
Datasheet
Page 49 of 60
REVISION 11 – 3 AUGUST 2018
Startup time
Startup timeStartup time
Startup time
12.1.1.
12.1.1.12.1.1.
12.1.1. First valid data
First valid dataFirst valid data
First valid data
After POR the first valid data is available after (depending on the selected refresh rate) )
[*gwM*ƒ*
which is calculated as:
)
[*gwM*ƒ*
<, ms (Example refresh rate is 2Hz – the default value)
It is always subpage 0 to be measured first after POR then subpage 1 and so on alternating.
NOTE: In case one changes the refresh rate on the fly (by writing new values into device register (0x800D)) the settings
will take place only after the subpage under measurement is finished.
12.1.2.
12.1.2.12.1.2.
12.1.2. Thermal behavior
Thermal behavior Thermal behavior
Thermal behavior
Although electrically the device is set and running there is thermal stabilization time necessary before the device can
reach the specified accuracy – up to 4 min.
Vdd
40ms 2Hz
Subpage 0 Subpage 1
Set 8Hz
Subpage 0
Default
Active 2Hz refresh rate 8Hz refresh rate start