MTi 1-series User Manual
Xsens MTi User Manual Repository
Hardware Integration Manual
Copyright © 2021 Xsens
Page 81
Power supply
The MTi 1-series module has two supply pins: VDDA and VDDIO. They can be supplied
independently or tied together to adapt various concepts, depending on the intended
application. The different supply voltages are explained in the following subsections.
Main supply voltage (VDDIO)
The VDDIO pin is the main supply of the MTi 1-series module. This pin is connected to all the
digital IO’s, and powers the processor on the MTi 1-series module. #Power supply
specifications shows the acceptable range of VDDIO. For the most power efficient
implementation, the VDDIO pin should be connected to a 2.8 V power supply.
Analog supply voltage (VDDA)
The VDDA pin of the MTi 1-series module is connected to all the power supply pins of the
sensing elements that are on the MTi 1-series module. There is no low-dropout regulator (LDO)
on the MTi 1‑series. The table below shows the acceptable range of VDDA. To get the best
sensor performance, it is important that the VDDA pin is supplied by a power supply with a
maximum ripple of 50 mVpp.
Single power supply configuration
The MTi 1-series VDDA and VDDIO supply pins can be connected to the same power supply.
When the MTi 1-series is supplied with a single power supply source, it is strongly
recommended to decouple the VDDA and VDDIO supply pins with a ferrite bead, for the best
sensor performance. See schematic below. This way, the digital circuitry will not affect the
analogue sensing part. Due to the varying current required for the VDDA, the DC resistance of
the ferrite bead should not be too high. A DC resistance of maximum 1
Ω
is recommended.
