User Guide

Table Of Contents
RF Power Setting
22 Functionality of the Embedded Modules
maybe lower than that allowed by the regulatory requirements.The supported regions and
their maximum hop interval is defined in the following table:
Maximum Frequency Hop Interval
RF Power Setting
The power setting is calibrated at the factory and parameters are stored in flash memory
to ensure the power output is within +/– 1 dB of the desired setting. The power limits are
set by both hardware limitations and enforced by the firmware.
Power Units
All power values are reported in centi-dBm. Therefore, a power setting of 2500
corresponds to 25 dBm. All power values in the serial interface are specified as signed
16-bit integers. A dBm means power referenced to 1mW. Therefore, the conversion from
watts to dBm is:
dBm = 10 log
10
(power in mW)
For example: 0.1W = 100mW = 20dBm and 1W = 1000mW = 30dBm.
Power Calibration
A power calibration event occurs when the Power set point is changed, the Frequency is
changed, or the RF field is turned on. The power calibration routine calibrates the power
within 10 ms.
Region Max Hop Interval
NA 400 ms
EU3 4000 ms
PRC 200 ms
Open 400 ms