MLX90363 Datasheet, PDF (22/57 Pages) Melexis Microelectronic Systems – Triaxis® Magnetometer IC With High Speed Serial Interface

MLX90363
Triaxis® Magnetometer IC
With High Speed Serial Interface
Message Sequence Chart
Dual Slave - Mode 2 (Sync pulses)
Master
Slave1
GET2 ( )
NTT ()
GET2 ( )
NTT ()
Sync Pulse
Slave2
Loop
GET2 ( )
Regular Packet ()
GET2 ( )
Regular Packet ()
Sync Pulse
NOP ( )
Regular Packet ()
NOP ( )
Regular Packet ()
Figure 8 – Trigger mode 2 Message Sequence Chart
#7654321 0 #76543210
1
RST 0
3
Time – Out
2
Value
5
4
7
CRC
6 Marker 0 1 0 1 0 0
Table 10 – GET2 MOSI Message (Opcode = 20)
Parameter definition: See GET1 (Section 14.5).
14.7. Trigger Mode 3
Principle: The acquisition sequences are triggered by a GET message, but unlike the Mode 1, the
resulting data (position …) is buffered. The slave-out messages contain the buffered data of the previous
GET message, and not the newly computed values corresponding to the current GET slave-in request.
The buffering releases constraints on the SCI clock frequency (SCLK). The Mode 3 offers frame rates as
high as Mode 1, if not higher, with slower SCLK frequencies. When the clock frequency is limited (400
kbps or less), and when it matters to reach a certain frame rate, Mode 3 is preferred over Mode 1. In any
other cases, for instance when the shortest response time represents the main design criteria, Mode 1 is
preferred.
FW background
SPI ASP DSP
SPSPIAISPASDPSP DSP
SPI ASDPSP DSP
SPI
SPI HW
Get3
Get3
tSSRERE_mod3 ^Roll=0
tSSREFE_
mod3
Get3
Roll=1
Figure 9 – Trigger mode 3
NOP
Roll=2
3901090363
Rev. 005
Page 22 of 57
X
Data Sheet
Jul/13