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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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LLCC68 데이터시트(PDF) 76 Page - Semtech Corporation |
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LLCC68 데이터시트(HTML) 76 Page - Semtech Corporation |
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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 0x02 0x00 0x01 +22dBm Table 13-22: SetRxTxFallbackMode SPI Transaction Byte 0 1 Data from host Opcode = 0x93 fallbackMode Table 13-23: FallbackMode Definition Fallback Mode Value Description FS 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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