MLX90320_12 Datasheet, PDF (22/33 Pages) Melexis Microelectronic Systems – Automotive sensor interface

MLX90320
Automotive sensor interface
Read ADC value of the temperature.
COMIN
0
0
0
0
0
0
0
1
STOP bit
( =0 ) min. = 200 us
MAX. = 5 ms
COMO
Data
min. = 130 us
MAX. = 5 ms
STOP bit
( =0 )
Next command
Read the digital temperature value.
The ASSP is sending back the first byte, followed a few µs later by the second byte.
One must readout 10bits data from these two byte.
The first byte are the 8 MSB bits of the ADC. The two highest bits of the second byte are the LSB bits of the ADC.
Lock EEPROM
To avoid unwanted rewriting of the EEPROM content in the field, it is strongly recommended to lock the
EEPROM after calibration has been finished. For that purpose the ‘Lock EEPROM’ command can be
used. The customer cannot undo the ‘Lock EEPROM’ command. This can only be done by Melexis using
a special setup.
INM or INP connected to output
Test INP
COMIN
STOP bit
0
0
0
0
1
0
0
0
( =0 )
50 us
Test Mode
Connect INP input pin to the output. This mode can be left only by resetting the chip.
Test INM
COMIN
STOP bit
0
0
0
0
0
1
0
0
( =0 )
50 us
Test Mode
Connection INM input pin to the output. This mode can be left only by resetting the chip.
With communication one can select a mode where the INM or the INP signal is connected to the output.
The chip stays in that mode until a reset is given. This can be used for failure analysis.
3901090320
Page 22 of 33
Data Sheet