EVB90620 Datasheet, PDF (21/39 Pages) Melexis Microelectronic Systems – High precision non-contact temperature measurements

MLX90620
16x4 IR array
8.2 MLX90620 address map
The MLX90620 address map is shown below:
0x00
RAM
0x91
0x92 _{Configuration registers}
0x93
0x93
Not used
0xFF
Figure 16 Address map
8.2.1 RAM
The on chip 146x16 RAM is accessible for reading via I²C. The RAM is used for storing the results of
measurements of pixels and Ta sensor and is distributes as follows:
64 words for IR sensors. The data is in 2’s complement format (see 7.2.2)
1 word for measurement result of PTAT sensor. The data is 16 bit without sign. (see 7.2.1)
The memory map of the RAM is shown below:
RAM Address
0x00
0x01
0x02
0x03
0x04
0x05
…
0x3B
0x3C
0x3D
0x3E
0x3F
0X40
…
0X8F
0x90
0x91
RAM variable description
IR sensor (0,0) result
IR sensor (1,0) result
IR sensor (2,0) result
IR sensor (3,0) result
IR sensor (0,1) result
IR sensor (1,1) result
…
IR sensor (3,14) result
IR sensor (0,15) result
IR sensor (1,15) result
IR sensor (2,15) result
IR sensor (3,15) result
NA
…
NA
PTAT sensor result
TGC sensor result
Table 9: Result address map
For IR sensors results, the addressing can be summarized:
IR(x,y) is on address:
IR(x, y)address x 4.y
3001090620
Rev 4.0
Page 21 of 40
Datasheet IR16x4
19 September 2012