Product Manual

Additional Notes
Pin
Number
Note
3
Connection is unbuffered directly to a GPIO on the Tile processor.
Configuration will be provided via Tile firmware. GPIO pin is 3.3V tolerant, with
a sink/source current limit of ±8 mA (±20 mA with a relaxed VOL/VOH)
8
If not using the provided U.FL connector, a 50Ω impedance path must be
provided to a non-powered external GPS antenna.
9, 10
The 3.3V connection points are in parallel with one another and provide the
primary radio, amplifier, and system voltage which is always required. If the
designer wants to enable a complete power off mode, an electronic switch can
be provided here.
18
If not using the provided U.FL connector, a 50Ω impedance path must be
provided to the external VHF antenna.
Table 6: Additional notes on pin numbers
4.3 DC Power Interface
The DC power interface consists of the DC power inputs as summarized in Table 7. The +3.3V
inputs and ground supply returns are used to supply DC power to the Tile and ensure that
enough current can be drawn across the connector without the Tile malfunctioning during
transmit due to lack of current supply. In addition, the +3.3V inputs are used to supply DC power
to the Tile to operate its microcontroller as well as receive signals. All power and ground pins
should be connected externally. The power requirements apply to DC power measured at the
Tile user connector input and not at the output of the power supply. Long power supply cables
can cause a voltage drop sufficient to cause the voltage to be out of specification at the physical
power supply input to the Tile.
17