Fs Mode; Startup Sequence; Table 2-10: Setfscommand - Semtech LR1121 User Manual

2.1.9 FS Mode

Frequency Synthesis (FS) mode is an intermediate mode between standby mode and the RX or TX modes, where the PLL
and the associated regulators are switched on. The BUSY signal goes low as soon as the PLL is locked.
2.1.9.1 SetFs
Command SetFs(...) sets the device in Frequency Synthesis mode.

Table 2-10: SetFsCommand

Byte
Data from Host
Data to Host

2.2 Startup Sequence

At power-up or after a reset, the device initiates its startup phase.
•
The BUSY signal is set to high, indicating that the device is busy and cannot accept a command.
•
When the power management unit and RC oscillator become available, the embedded CPU starts and executes the
internal firmware.
•
At the end of the startup sequence, the device is set in Standby RC mode, the BUSY signal goes low and the device
accepts commands.
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