MLX90621 datasheet(24/44 Pages) MELEXIS

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MLX90621

16x4 IR array

Datasheet

39001090621

Page 24 of 44

Datasheet IR16x4

Rev 3.0

15 September 2016

MLX90621 address map

8.2.

The MLX90621 address map is shown below:

Figure 16 Address map

RAM

8.2.1.

The on chip 146x16 RAM is accessible for reading via I

2C. 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

RAM variable description

0x00

IR sensor (0,0) result

0x01

IR sensor (1,0) result

0x02

IR sensor (2,0) result

0x03

IR sensor (3,0) result

0x04

IR sensor (0,1) result

0x05

IR sensor (1,1) result

…

0x3B

IR sensor (3,14) result

0x3C

IR sensor (0,15) result

0x3D

IR sensor (1,15) result

0x3E

IR sensor (2,15) result

0x3F

IR sensor (3,15) result

0X40

PTAT sensor result

0x41

Compensation pixel result

Table 11: Result address map

For IR sensors results, the addressing can be summarized:

IR(x,y) is on address:

address

)

(

RAM

Configuration registers

Not used

0x00

0x92

0x93

0xFF

0x41

Not used

0x42

0x91

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