Semtech LR1121 - Commands; Setpaconfig; Table 9-4: Setpaconfig Command; Table 9-5: Dutycycle Parameters

LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
99 of 130
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9.5 Commands
9.5.1 SetPaConfig
Command SetPaConfig(...) selects which PA to use and configures the supply of this PA.
• PaSel selects the PA:
 0x00: Selects the low power PA
 0x01: Selects the high power PA
 0x02: Selects the high frequency PA
• RegPaSupply selects the PA power source:
 0x00: Powers the PA from the internal regulator
 0x01: Powers the PA from VBAT. The user must use RegPaSupply = 0x01 whenever TxPower > 14
• PaDutyCycle controls the duty cycle of each PA
• PaHPSel controls the size of the high power PA.
Table 9-4: SetPaConfig Command
Byte 0 1 2 3 4 5
Data from Host 0x02 0x15 PaSel RegPaSupply PaDutyCycle PaHPSel
Data to Host Stat1 Stat2
IrqStatus
(31:24)
IrqStatus
(23:16)
IrqStatus
(15:8)
IrqStatus
(7:0)
Table 9-5: DutyCycle Parameters
Low Power PA High Power PA High Frequency PA
Allowed
Range
For frequency < 400MHz, PaDutyCycle ≤ 0x06
For frequency ≥ 400MHz, PaDutyCycle ≤ 0x03
At PaHpSel ≥ 0x04, PaDutyCycle ≤ 0x03 0 ≤ PaDutyCycle ≤ 0x07
Default
value
PaDutyCycle = 0x04