RF69 datasheet(35/81 Pages) ETC2

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RF69

Page 35

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4. Operating Modes

4.1. Basic Modes

The circuit can be set in 5 different basic modes which are described in Table 16.

By default, when switching from a mode to another one, the sub-blocks are woken up according to a pre-defined and

optimized sequence. Alternatively, these operating modes can be selected directly by disabling the automatic sequencer

(SequencerOff in RegOpMode = 1).

Table 16 Basic Transceiver Modes

ListenOn

in RegOpMode

Mode

in RegOpMode

Selected mode

Enabled blocks

0 0 0

Sleep Mode

None

0 0 1

Stand-by Mode

Top regulator and crystal oscillator

0 1 0

FS Mode

Frequency synthesizer

0 1 1

Transmit Mode

Frequency synthesizer and transmitter

1 0 0

Receive Mode

Frequency synthesizer and receiver

Listen Mode

See Listen Mode, section 4.3

4.2. Automatic Sequencer and Wake-Up Times

By default, when switching from one operating mode to another, the circuit takes care of the sequence of events in such a

way that the transition timing is optimized. For example, when switching from Sleep mode to Transmit mode, the RF69 goes

first to Standby mode (XO started), then to frequency synthesizer mode, and finally, when the PLL has locked, to

transmit mode. Entering transmit mode is also made according to a predefined sequence starting with the wake-up of the

PA regulator before applying a ramp-up on the PA and generating the DCLK clock.

 The crystal oscillator wake-up time, TS_OSC, is directly related to the time for the crystal oscillator to reach its steady

state. It depends notably on the crystal characteristics.

 The frequency synthesizer wake-up time, TS_FS, is directly related to the time needed by the PLL to reach its steady

state. The signal PLL_LOCK, provided on an external pin, gives an indication of the lock status. It goes high when the

PLL reaches its locking range.

Four specific cases can be highlighted:



Transmitter Wake Up time from Sleep mode

= TS_OSC + TS_FS + TS_TR



Receiver Wake Up time from Sleep mode

= TS_OSC + TS_FS + TS_RE



Receiver Wake Up time from Sleep mode, AGC enabled

= TS_OSC + TS_FS + TS_RE_AGC



Receiver Wake Up time from Sleep mode, AGC and AFC enabled

= TS_OSC + TS_FS + TS_RE_AGC&AFC

These timings are detailed in sections 4.2.1 and 4.2.3.

In applications where the target average power consumption, or the target startup time, do not require setting the RF69 in

the lowest power modes (Sleep or Standby), the respective timings TS_OSC and TS_FS in the former equations can be

omitted.

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