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mosaic-X5 Integration
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4
mosaic-X5 Integration
4.1
Minimal Design
A minimal design, exposing only a single serial port (COM1-TTL) is shown below. In this
example:
•
All gound pins and the
pins marked “
Reserved_GND
”
are connected to ground
(GND).
•
A 3.3VDC supply is provided to the VDD_3V3 pins and to the VDD_BAT pin. A 22µF
decoupling capacitor is recommended.
•
To provide power to the antenna, the VANT pins are also connected to the 3.3V
supply.
•
The antenna is directly fed into the ANT pin.
•
The 2V8_IN and 2V8_OUT pins are connected, as no external frequency reference
is used (see section 3.7).
•
The REF_I and REF_O pins are connected for the same reason.
•
1V8_OUT is connected to SYNC (this must always be the case).
•
All other pins are left unconnected.
For easier debugging during host design development, it is recommended to always route
at least one of the COM ports to test pads or a test header.