MLX90363 Datasheet, PDF (27/57 Pages) Melexis Microelectronic Systems – Triaxis® Magnetometer IC With High Speed Serial Interface

MLX90363
Triaxis® Magnetometer IC
With High Speed Serial Interface
14.11. NOP Command and NOP Answer
#7 6 5 4 3 2 1 0 # 7 6 5 4 3 2 10
1
0
3
KEY [15:8]
2
KEY [7:0]
5
4
7
CRC
611010000
Table 21 – NOP(Challenge) MOSI Message (Opcode = 16)
MSC NOP
Master
Slave
NOP(Challenge) ( )
X ()
Next Cmd ( )
Challenge Echo ()
Figure 15 – NOP Message Sequence Chart
Note: the message X means “unspecified valid answer” and typically contains the answer of the previous
command.
• Parameter Key : any 16 bit number
#7 6 5 4 3 2 1 0 # 7 6 5 4 3 2 10
1
0
3
KEY_ECHO [15:8]
2
KEY_ECHO [7:0]
5
INVERTED KEY_ECHO [15:8]
4
INVERTED KEY_ECHO [7:0]
7
CRC
611010001
Table 22 - Challenge Echo MISO Message (Opcode = 17)
• Parameter Key_Echo = Key
• Parameter InvertedKey_Echo = 65535 - Key (meaning bit reversal).
14.12. OscCounterStart and OscCounterStop Commands
The SCI Master can evaluate the slave’s internal oscillator frequency by the use of the OscCounterStart
and OscCounterStop commands. This first command enables in the MLX90363 a software counter
whereas the second command stops it and returns the counter value.
#7 6 5 4 3 2 1 0 # 7 6 5 4 3 2 10
1
0
3
2
5
4
7
CRC
611011000
3901090363
Rev. 005
Page 27 of 57
Data Sheet
Jul/13