Both SX1262 and SX1278/6 can use TCXO crystal oscillator. If TCXO crystal oscillator is used, the XTB pin is not connected, but the 6th pin (DIO3) of SX1262 can be used to power the TCXO crystal oscillator, which only needs to be configured through software. When XTAL is used, SX1278/6 needs to add matching capacitors externally; while SX1262 does not need to add external matching capacitors, which are built-in and can be directly adjusted by software.
The frequency band supported by SX1278 is 137-525MHz, the RF transmit output pin is pin 27 (PA_BOOST) or pin 28 (RFO_LF), the RF receive input pin is pin 1 (RFI_LF); the frequency band supported by SX1276 is 137-1020MHz, when When using 137-525MHz, the RF transmit output pin must be pin 27 (PA_BOOST) or pin 28 (RFO_LF), and the RF receive input pin must be pin 1 (RFI_LF). modbus over rs485 When using 862-1020MHz, the RF transmit output pin It must be the 27th pin (PA_BOOST) or the 22nd pin (RFO_HF), and the RF receiving input pin must be the 21st pin (RFI_HF). From this point of view, SX1276 can be understood as an enhanced version of SX1278.
The frequency band supported by SX1262 is 150-960MHz, the RF transmit output pin is pin 23 (RFO), and the RF receive differential input pins are pin 21 (RFI_P) and pin 22 (RFI_N). When changing the frequency band, serial to ethernet adaptor there is no need to change the pins, just adjust the parameters of the RF circuit.