EVB90620 Datasheet, PDF (29/39 Pages) Melexis Microelectronic Systems – High precision non-contact temperature measurements

MLX90620
16x4 IR array
9.4.2 Write configuration register command
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 22: Configuration register update command structure
9.4.3 Write trimming command
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.
Write trimming Trimming data check Trimming data Trimming data check Trimming data
Slave address
opcode
LSByte
LSByte
MSByte
MSByte
S
T
A
R
T
0A
A
A
A
A
S
T
O
AP
C
C
C
C
C
C
K
K
K
K
K
K
Figure 23: Oscillator trimming register update command structure
3001090620
Rev 4.0
Page 29 of 40
Datasheet IR16x4
19 September 2012