SI4362 Datasheet, PDF (34/46 Pages) Silicon Laboratories – Garage and gate openers

Si4362
8.2. Low Duty Cycle Mode (Auto RX Wake-Up)
The low duty cycle (LDC) mode is implemented to automatically wake-up the receiver to check if a valid signal is
available. It allows low average current polling operation by the Si4362 for which the wake-up timer (WUT) is used.
RX LDC operation must be set via the GLOBAL_WUT_CONFIG property when setting up the WUT. The LDC
wake-up period is determined by the following formula:
LDC
=
WUT_LDC

4_-----_-----2_----^W_----^U_---^T_---^__---^R_--
32 768

ms

where the WUT_LDC parameter can be set by the GLOBAL_WUT_LDC property. The WUT period must be set in
conjunction with the LDC mode duration; for the relevant API properties, see the wake-up timer (WUT) section.
Figure 11. RX LDC Sequences
The basic operation of RX LDC mode is shown in Figure 12. The receiver periodically wakes itself up to work on
RX_STATE during LDC mode duration. If a valid preamble is not detected, a receive error is detected, or an entire
packet is not received, the receiver returns to the WUT state (i.e., ready or sleep) at the end of LDC mode duration
and remains in that mode until the beginning of the next wake-up period. If a valid preamble or sync word is
detected, the receiver delays the LDC mode duration to receive the entire packet. If a packet is not received during
two LDC mode durations, the receiver returns to the WUT state at the last LDC mode duration until the beginning
of the next wake-up period.
Figure 12. Low Duty Cycle Mode for RX
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