Settxparams; Table 9-6: Settxparams Command; Table 9-7: Ramptime Values - Semtech LR1121 User Manual

9.5.2 SetTxParams

Command SetTxParams(...) sets the Tx Power and Ramp Time of the selected PA. SetPaConfig(...) must be sent
prior to this command.

Table 9-6: SetTxParams Command

Byte
Data from Host
Data to Host
•
TxPower defines the output power in dBm in a range of:
- 17dBm (0xEF) to +14dBm (0x0E) by steps of 1dB if the low power PA is selected

- 9dBm (0xF7) to +22dBm (0x16) by steps of 1dB if the high power PA is selected

-18dBm (0xEE) to +13dBm (0x0F) by steps of 1dB if the high frequency PA is selected

If TxPower > +14dBm, the user must select the VBAT supply for the PA using the SetPaConfig command

•
RampTime defines the PA power ramping time, which can be from 16 to 304s according to the following table:

Table 9-7: RampTime Values

RampTime
SET_RAMP_16U
SET_RAMP_32U
SET_RAMP_48U
SET_RAMP_64U
SET_RAMP_80U
SET_RAMP_96U
SET_RAMP_112U
SET_RAMP_128U
SET_RAMP_144U
SET_RAMP_160U
SET_RAMP_176U
SET_RAMP_192U
SET_RAMP_208U
SET_RAMP_240U
SET_RAMP_272U
SET_RAMP_304U
A RampTime of 48s allows the best trade-off between a fast RF power establishment and minimum RF spurious emissions,
therefore complying with radio standards.
LR1121
User Manual Rev 1.1
UM.LR1121.W.APP Mar 2023
0
0x02 0x11
Stat1 Stat2
Value
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x07
0x08
0x09
0x0A
0x0B
0x0C
0x0D
0x0E
0x0F
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1 2
TxPower
IrqStatus(31:24)
Ramp Time in s
16
32
48
64
80
96
112
128
144
160
176
192
208
240
272
304
3
RampTime
IrqStatus(23:16)
100 of 130
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