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2
Document MT1503P.A
© Xsens Technologies B.V.
Hardware Integration Manual MTi 1-series
2 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.
2.1 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. Section 2.4 shows the acceptable range of
VDDIO. For the most power efficient implementation, the VDDIO pin should be connected to a 1.8 V
power supply.
2.2 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. Section 2.4 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.
2.3 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, for example with a resistor, for the best sensor performance (see Figure
1). This way the digital circuitry will not influence the analogue sensing part. Considering the minimum
operating voltage for VDDA, the single supply voltage VDD should be at least 2.2 V, due to the voltage
drop over R1.
Figure 1: External components single supply (I
2
C interface)
