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SX1231
WIRELESS & SENSING PRODUCTS
DATASHEET
4. Operating Modes
4.1. Basic Modes
The circuit can be set in 5 different basic modes which are described in Table 15.
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 15 Basic Transceiver Modes
ListenOn
in RegOpMode
0
0
0
0
0
1
Mode
in RegOpMode
000
001
010
011
100
x
Selected mode
Sleep Mode
Stand-by Mode
FS Mode
Transmit Mode
Receive Mode
Listen Mode
Enabled blocks
None
Top regulator and crystal oscillator
Frequency synthesizer
Frequency synthesizer and transmitter
Frequency synthesizer and receiver
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 SX1231
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.
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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:
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Transmitter Wake Up time from Sleep mode
Receiver Wake Up time from Sleep mode
Receiver Wake Up time from Sleep mode, AGC enabled
Receiver Wake Up time from Sleep mode, AGC and AFC enabled
= TS_OSC + TS_FS + TS_TR
= TS_OSC + TS_FS + TS_RE
= TS_OSC + TS_FS + TS_RE_AGC
= 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 SX1231
in the lowest power modes (Sleep or Standby), the respective timings TS_OSC and TS_FS in the former equations can be
omitted.
Rev. 7 - June 2013
Page 37
www.semtech.com
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