EVB90620 Datasheet, PDF (25/39 Pages) Melexis Microelectronic Systems – High precision non-contact temperature measurements

MLX90620
16x4 IR array
9 Communication protocol
The device supports Fast Mode Plus I²C FM+ (IR array only up to 1Mbps) and will work in slave
mode only.
The master device is providing the clock signal (SCL) for the communication. The data line SDA is
bidirectional and is driven by the master or the slave depending on the command. The selection of the SDA
occupant is done according to the I²C specification. As the SDA is an open-drain IO, ‘0’ is transmitted by
forcing the line ‘LOW’ and a ‘1’ just by releasing it. During data transfer, the data line could be changed only
while SCL is low. Other wise, it would be interpreted as a start/stop condition
9.1 Communication pins
There are two communication pins SCL and SDA. SCL is an input only for the MLX90620 while the
SDA pin is a bidirectional one. The SDA line should be wired in an open-drain configuration.
90620
90670
scl_in
+V DD
external
Rp
Rp
90670
Digital
Block
sda_out
sda_in
SCL
SCL (Serial Clock Line )
SDA
SDA (Serial data Line )
External I2C
Master
Figure 17 Communication pin diagram
SCL
SDA
24AA02
3001090620
Rev 4.0
Page 25 of 40
Datasheet IR16x4
19 September 2012