Data Sheet

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MLX90640 32x24 IR array

Datasheet

Page 4 of 60

REVISION 11 – 3 AUGUST 2018

Tables

Table 1 Ordering information .......................................................................................................................................................... 6

Table 2 Glosarry of terms ................................................................................................................................................................ 7

Table 3 Pin definition ...................................................................................................................................................................... 8

Table 4 Absolute maximum ratings ................................................................................................................................................. 8

Table 5 Electrical specification ........................................................................................................................................................ 9

Table 6 Priorities of subpage controls (0x0800D) ............................................................................................................................17

Table 7 Configuration parameters memory ....................................................................................................................................19

Table 8 EEPROM to registers mapping ............................................................................................................................................19

Table 9 EEPROM overview (words) .................................................................................................................................................20

Table 10 Calibration parameters memory (EEPROM - bits) ..............................................................................................................21

Table 11 Calculation example input data ........................................................................................................................................30

Table 12 Calculation example calibration data ................................................................................................................................34

Table 13 XOR truth table ................................................................................................................................................................42

Table 14 Noise performance ..........................................................................................................................................................51

Table 15 Available FOV options ......................................................................................................................................................52

Table 16 Revision history ...............................................................................................................................................................60

Figures

Figure 1 Block diagram ................................................................................................................................................................... 1

Figure 2 MLX90640 Overview and pin description ........................................................................................................................... 8

Figure 3 Pixel in the whole FOV ......................................................................................................................................................10

Figure 4 I

C write command format (default SA=0x33 is used) ........................................................................................................11

Figure 5 I

C read command format (default SA=0x33 is used) .........................................................................................................11

Figure 6 Refresh rate timing ...........................................................................................................................................................12

Figure 7 Recommended measurement flow ...................................................................................................................................13

Figure 8 TV mode reading pattern (only highlighted cells are updated) ...........................................................................................15

Figure 9 Chess reading pattern (only highlighted cells are updated) ................................................................................................15

Figure 10 MXL90640 memory map .................................................................................................................................................16

Figure 11 Status register (0x8000) bits meaning .............................................................................................................................16

Figure 12 Control register1 (0x800D) bits meaning .........................................................................................................................17

Figure 13 I

C configuration register (0x800F) bits meaning .............................................................................................................18

Figure 14 RAM memory map (Chess pattern mode) – factory default mode ....................................................................................18

Figure 15 RAM memory map (Interleaved mode) ...........................................................................................................................18

Figure 16 To calculation flow .........................................................................................................................................................35

Figure 17 Absolute temperature accuracy – MLX90640BAA (left) and MLX90640BAB (right) ...........................................................47

Figure 18 Different accuracy zones depending on device type (BAA on the left and BAB on the right) .............................................48

Figure 19 MLX90640BAx noise vs refresh rate for different device types .........................................................................................50

Figure 20 MLX90640BAA noise vs pixel and refresh rate at 1Hz and 2Hz .........................................................................................50

Figure 21 MLX90640BAA noise vs pixel and refresh rate at 4Hz, 8Hz and 16Hz ................................................................................50

Figure 22 MLX90640BAB noise vs pixel and refresh rate at 1Hz and 2Hz .........................................................................................51

Figure 23 MLX90640BAB noise vs pixel and refresh rate at 4Hz, 8Hz and 16Hz ................................................................................51

Figure 24: Field Of View measurement ...........................................................................................................................................52

Figure 25 MLX90640 electrical connections ....................................................................................................................................53

Figure 26 Calculation flow in thermal image mode .........................................................................................................................54

Figure 27 Mechanical drawing of 55° FOV device ............................................................................................................................56