LLCC68 datasheet(76/111 Pages) SEMTECH

76 / 111 page

LLCC68

Data Sheet

Rev. 1.1

DS.LLCC68.W.APP

Dec 2024

76 of 111

Semtech

LLCC68

www.semtech.com

13.1.14.1 PA Optimal Settings

PA optimal settings are used to maximize the PA efficiency when the requested output power is lower than the nominal +22dBm. For

example, the maximum output power in Japan is +10dBm, and in China it is +17dBm in some bands. Those optimal settings require:

• a dedicated matching / PA load impedance

• a specific tweaking of the PA settings, described in Table 13-21: PA Operating Modes with Optimal Settings

Note: These changes make the use of nominal power either sub-optimal or unachievable.

Caution! The following restrictions must be observed to avoid voltage overstress on the PA, exceeding the maximum ratings may

cause irreversible damage to the device: paDutyCycle should not be higher than 0x04.

13.1.15 SetRxTxFallbackMode

The command SetRxTxFallbackMode() defines into which mode the chip goes after a successful transmission or after a packet

reception.

The fallbackMode byte definition is given as follows:

By default, the radio always returns in STDBY_RC unless the configuration is changed by using this command. Changing the default mode

from STDBY_RC to STDBY_XOSC or FS impacts the switching time of the radio.

Table 13-21: PA Operating Modes with Optimal Settings

Output Power

paDutyCycle

hpMax

deviceSel

paLut

Value in

SetTxParams1

1. See Section 13.4.4 "SetTxParams" on page 83 .

+22dBm

0x04

0x07

0x00

0x01

+22dBm

+20dBm

0x03

0x05

0x00

0x01

+22dBm

+17dBm

0x02

0x03

0x00

0x01

+22dBm

+14dBm

0x02

0x00

0x01

+22dBm

Table 13-22: SetRxTxFallbackMode SPI Transaction

Byte

Data from host

Opcode = 0x93

fallbackMode

Table 13-23: FallbackMode Definition

Fallback Mode

Value

Description

0x40

The radio goes into FS mode after Tx or Rx

STDBY_XOSC

0x30

The radio goes into STDBY_XOSC mode after Tx or Rx

STDBY_RC

0x20

The radio goes into STDBY_RC mode after Tx or Rx

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