FMT1000 Datasheet, PDF (24/29 Pages) Fairchild Semiconductor – Motion Tracking Module with Output of Orientation, Inertial Motion Data and Magnetic Field

6.4 Synchronization and Timing
The FMT1000-series modules can easily be synchronized with other sensors or sensor systems. The FMT accepts a
pulse and can then transmit the latest available data. This SYNC_IN functionality does not influence the accuracy of
the data as internally the FMT1000-series keeps estimating the orientation at its maximum frequency. Acceleration
data and rate of turn data is also outputted with the shortest possible latency.
The Sync Settings are set with the SetSyncSettings message:
SetSyncSettings
MID 44 (0x2C)
DATA Setting List (N*12 bytes)
Set the synchronization settings of the device
Settings
Each setting describes either a system event that should trigger a sync in event that should trigger a system action.
Table 21. SYNC_IN Setting
Offset
(bytes)
Setting
Size
(bytes)
Description
0
Function
1
Value 8: Send Latest
1
Line
1
Value 2: SYNC_IN
2
Polarity
1
Which line transition to respond to? One of: Rising Edge (1),
Falling Edge (2) or Both (3)
3
Ignored for FMT1000-series
4
Skip First
2
The number of initial events to skip before taking action.
6
Skip Factor
2
The number of events to skip after taking the action before
taking action again.
8
Ignored for FMT1000-series
10
Delay
2
Delay after receiving a sync pulse to taking action
(100 μs units, range [0..60000])
© 2015 Fairchild Semiconductor Corporation
FMT1000-series • Rev. 1.0
24
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