The individual sub-fields are described below.
Description of fields within Register file: 0x1E – Transmit Power Control (when DIS_STXP is 0)
TXPOWPHR
reg:1E:00
bits:15–8
This power setting is applied during the transmission of the PHY header (PHR) portion of the
frame. Section 7.2.31.1 – Units of TX Power Control details the programming of this.
WARNING: The register default value here is for the smart power control mode of operation
(as described in section 7.2.31.2 above) but may be too high for the manual use case. In
order to comply with regional spectrum regulations it should be reduced to the level
appropriate for the external RF circuitry and compliance to the regulations.
TXPOWSD
reg:1E:00
bits:23–16
This power setting is applied during the transmission of the synchronisation header (SHR)
and data portions of the frame. The SHR consists of the preamble and SFD portions of the
frame that precede the PHR, and the Data portion of the frame is the piece following the
PHR. Section 7.2.31.1 – Units of TX Power Control details the programming of this value.
WARNING: The register default value here is for the smart power control mode of operation
(as described in section 7.2.31.2 above) but may be too high for the manual use case. In
order to comply with regional spectrum regulations it should be reduced to a level
appropriate for the external RF circuitry and compliance to the regulations.
The Table 19 values apply when smart TX power is being employed (i.e. the Disable Smart TX Power Control
bit DIS_STXP in Register file: 0x04 – System Configuration is zero, not set), and, the Table 20 values apply
when smart TX power is disabled (i.e. DIS_STXP=1).
7.2.31.4 Transmit Power Control Reference Values
Reference values for setting Register file: 0x1E – Transmit Power Control are given below in Table 19 and
Table 20. These may be used as starting point for transmit power calibration. They are based on a typical IC
and an assumed IC to antenna loss of 1.5 dB with a 0 dBi antenna. Generally to avoid out of band spectral
emissions the mixer gain should be kept low however increasing the DA gain will increase current
consumption. The Table 19 and Table 20 values are dependent on the selected channel (frequency) and on
the configured PRF. These settings are designed to deliver a nominal power spectrum density of
-41.3 dBm/MHz to the antenna, assuming a 1.5 dB loss (due to balun and RF traces) between the IC output
and the antenna.
The Table 19 values apply when smart TX power is being employed (i.e. the Disable Smart TX Power Control
bit DIS_STXP in Register file: 0x04 – System Configuration is zero, not set), and, the Table 20 values apply
when smart TX power is disabled (i.e. DIS_STXP = 1).
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