MLX90621

16x4 IR array

Datasheet

39001090621

Page 32 of 44

Datasheet IR16x4

Rev 3.0

15 September 2016

Write configuration register command

9.4.3.

Opcode – 0x03.

This command is used to set the configuration register (16bits) value – all configuration settings.

Each data byte is transmitted in two stages:

- First stage

Data byte - 0x55

- Second stage

Data byte

This way of transmitting the data is done in order to have a simple error check.

The chip adds 0x55 to the first byte and compares the result with the second one. If both match the configuration

register is updated.

Figure 24: Configuration register update command structure

Write trimming command

9.4.4.

Opcode – 0x04.

This command is used to set the oscillator trimming oscillator trimming value.

This command is used to set the oscillator trimming register (16bits) value.

Each data byte is transmitted in two stages:

- First stage

Data byte - 0xAA

- Second stage

Data byte

This way of transmitting the data is done in order to have a simple error check.

The chip adds 0xAA to the first byte and compares the result with the second one. If both match the oscillator

trimming register is updated.

Figure 25: Oscillator trimming register update command structure

S

T

A

R

T

A

C

K

0

Slave address

Write trimming

opcode

A

C

K

Trimming data check

LSByte

A

C

K

Trimming data

LSByte

A

C

K

S

T

O

P

A

C

K

Trimming data

MSByte

Trimming data check

MSByte

A

C

K