Datasheet

MLX90640 32x24 IR array
Datasheet
Page 14 of 60
REVISION 11 – 4 MAY 2018
In case a step mode is used following flow is recommended:
Figure 8 Step mode measurement flow
10.6.
10.6.10.6.
10.6. Reading patterns
Reading patternsReading patterns
Reading patterns
The array frame is divided in two subpages and depending of bit 12 in “Control register 1” (0x800D) – “Reading pattern”
there are two modes of the pixel arrangement:
- Chess pattern mode (factory default)
- TV interleave mode
NOTE1: As a standard the MLX90640 is calibrated in Chess pattern mode, this results in better fixed pattern noise behaviour
of the sensor when in chess pattern mode. For best results Melexis advices to use chess pattern mode.
NOTE2: Please make sure a proper configuration of the subpage control bit is done. See: Table 6 Priorities of subpage controls
Step Mode?
Start measurement
Step mode
Read measurement data (desired IR data + PTAT)
Continuous mode
Measurement end?
No
Note: In step mode the measurement end could be determined in
3 ways:
1.Introducing an appropriate delay;
2.By polling the flags (configuration IO at 0x92, bits 8 and 9)
3.Combination of 1. and 2.
No
Yes