MLX90320 Datasheet, PDF (20/32 Pages) Melexis Microelectronic Systems – Automotive small sensor interface

MLX90320
Automotive small sensor interface
Data sent by the MLX90320
Period Length (µs)
Minimum Typical Maximum
1
510
695
Data received by the MLX90320
Period Length (µs)
Minimum Typical Maximum
1250
1700
2250
6.5.4 Commands
All delays mentioned below are calculated for a typical clock-frequency of 4 MHz.
The clock frequency can differ +/- 15% on each chip. The delays will vary proportionally.
Stop communication mode
COMIN
STOP bit
1
0
0
0
0
0
0
0
( =0 )
50 us
Stop the communication, ASSP goes back into normal mode.
A new communication request is needed to get back into communication mode.
Normal Mode
Reply A5
COMIN
STOP bit
0
1
0
0
0
0
0
0
( =0 )
100 us
COMO
min. = 150 us
MAX. = 5 ms
Next command
1
0
1
0
0
1
0
1
STOP bit
( =0 )
Command to see whether or not the ASSP is still in communication mode.
If so, the ASSP shall respond $A5.
Write to EEPROM
COMIN
0
0
1
0
0
0
0
0
STOP bit
( =0 )
min. = 150 us
MAX. = 5 ms
Address
STOP bit
( =0 )
min. = 4,8 ms
MAX. = 10 ms
Data
STOP bit
( =0 )
min. = 18 ms
Next command
Write to a specific address. The address in the EEPROM is coded with 8 bits. As the EEPROM has 64 addresses
the two first address bits should be 0. The data to store in one EEPROM address is coded with 8 bits. As each
EEPROM address stores 4 calibration data bits and one parity bit, the 3 first data bits from the data byte should
be 0.
Read from EEPROM
COMIN
0
0
0
1
0
0
0
0
STOP bit
( =0 ) min. = 120 us
MAX. = 5 ms
COMO
Address
STOP bit
( =0 )
70 us
Data
min. = 120 us
MAX. = 5 ms
STOP bit
( =0 )
Next command
Read a specific address. The address in the EEPROM is coded with 8 bits. As the EEPROM has 64 addresses
the two first address bits should be 0. A data byte is returned when reading the data from one EEPROM address
but actually it contains four calibration data bits and one parity bit. So the 3 first bits read from an EEPROM
address should be 0.
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
3901090320
Rev 004
Page 20 of 32
Data Sheet
Mar/05