User's Manual

8
RAK2247
8
RAK2247 User Manual V1.0
2.10 Antenna RF Interface
The modules have one RF interfaces over a standard UFL connectors (Hirose U.
FL-R-SMT) with a characteristic impedance of 50OHM. The RF port (J1) supports
both Tx and Rx, providing the antenna interface.
2.11 Electrical Characteristics
Stressing the device above one or more of the ratings listed in the Absolute
Maximum Rating section may cause permanent damage. These are stress ratings
only. Operating the module at these or at any conditions other than those specified
in the Operating Conditions sections of the specification should be avoided.
Exposure to Absolute Maximum Rating conditions for extended periods may affect
device reliability. The operating condition range define those limit within which the
functionality of the device is guaranteed.
Where application information is given, it is advisory only and does not form part of
the specification.
2.11.1 Absolute Maximum Rating
Limiting values given below are in accordance with the Absolute Maximum Rating
System (IEC 134).
Symbol
Description
Condition
Min.
Max.
3.3Vaux
Module supply voltage
Input DC voltage at 3.3Vaux pins
–0.3V
3.6V
USB
USB D+/D- pins
Input DC voltage at USB interface pins
3.6V
SPDT_SEL
Port select
Input DC voltage at SPDT_SEL input pins
–0.3V
3.6V
RESET
RAK2247 reset input
Input DC voltage at RESET input pin
–0.3V
3.6V
SPI
SPI interface
Input DC voltage at SPI interface pin
–0.3V
3.6V
GPS_PPS
GPS 1 pps input
Input DC voltage at GPS_PPS input pin
–0.3V
3.6V
Rho_ANT
Antenna ruggedness
Output RF load mismatch ruggedness at ANT1
10:1VSWR
Tstg
Storage Temperature
–40°C
85°C
Table 3 | Absolute maximum ratings
The product is not protected against overvoltage or reversed voltages. If necessary,
voltage spikes exceeding the power supply voltage specification, given in table
above, must be limited to values within the specified boundaries by using
appropriate protection devices.