MPXY8300 datasheet(8/164 Pages) FREESCALE

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MPXY8300 Series

Sensors

Freescale Semiconductor

Figure 2-5 Recommended Power Supply Connections

2.3.2

AVDD and AVSS Pins

The analog circuits operate from a single power supply connected to the device through the AVDD and AVSS pins. AVDD is the

positive supply and AVSS is the ground. The conductors to the power supply should be connected to the AVDD and AVSS pins

and locally decoupled as shown in Figure 2-5.

Care should be taken to reduce measurement signal noise by separating the VDD, VSS, AVDD, AVSS and RVSS pins using a “star”

connection such that each metal trace does not share any load currents with other external devices as shown in Figure 2-5.

2.3.3

VCAP Pin

An external load capacitor is connected the VCAP pin when using the internal charge pump to generate a voltage higher than VDD

for the RFX device. If the charge pump is not used this pin should be left unconnected.

2.3.4

VRF Pin

The VRF pin provides the power output voltage for RFX and should be connected to the RF pin through an inductor.

2.3.5

RVSS Pin

Power in the RF output amplifier is returned to the supply through the RVSS pin. This conductor should be connected to the power

supply as shown in Figure 2-5 using a “star” connection such that each metal trace does not share any load currents with other

supply pins.

2.3.6

RF Pin

The RF pin is the RF energy data supplied by the device to an external antenna.

2.3.7

XO, XI Pins

The XO and XI pins are for an external crystal to be used by the internal PLL for creating the carrier frequencies and data rates

for the RF pin.

0.1 µF

MPXY8300

VDD

VSS

to other

Battery

IDD

ILOAD

Bypass capacitors

closely coupled to

the package pins

MPXY8300 and Other Load Currents

star connected to battery terminals

loads

0.1 µF

AVDD

AVSS

RVSS

MPXY8300 Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc

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