Chapter 1
9
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G
ENERAL
D
ESCRIPTION
1.1. Physical Interfaces
1.1.1. Serial Data Interface
The serial asynchronous interface allows connection to external serial devices. It is shared between user
data and unit’s command/status information. All commonly supported baud rates, parity and bit
configurations are available up to 115.2 kbps.
1.1.2. Power Interface
The power interface allows connection to an unregulated DC power source. The DC power source (third-
party or user supplied) must provide DC power of 4.0V±5% DC.
The standalone unit’s RF interface is a 50-ohm impedance matched standard MMCX connector as
required by regulation.
1.1.3. Power Consumption
Power consumption of the Spread Spectrum radio modem at continuous transmission mode with 1W
output power level is less than 4500mW (refer to Table 1-1 for details).
Table 1-1. Power Consumption
Operating Mode / Description
Consumption
Maximum for continuous transmission with 1W output
power level
1
1. The supply voltage (pins 15 and 16 in user interface connector,)
must be 3.6 to 4.2VDC to provide RF output power >500mW
(licensed operation mode).
< 4500 mW
Maximum for Rx Full Operation Mode
< 2000 mW
Average for Operation Mode with 30% Transmission duty
cycle
< 2000 mW
Average for Operation Mode with 50% Transmission duty
cycle
< 3000 mW
Sleep Mode
300 mW
Standby Mode, ordered by SLEEP input pin
500
W
