Data Sheet

LJ1269HC
Rev1.0 Page 38 Web: www.ljelect.com
Figure 20. Listen Mode Sequence (no wanted signal is received)
4.3.1. Timings
The duration of the Idle phase is given by tListenIdle. The time during which the receiver is on and waits for a signal is given by
tListenRx. tListenRx includes the wake-up time of the receiver, described in section 4.2.3. This duration can be programmed in the
configuration registers via the serial interface.
Both time periods tListenRx and tListenIdle (denoted tListenX in the following text) are fixed by two parameters from the configuration
register and are calculated as follows:
tListenX = ListenCoefX ∗ Listen Re solX
where ListenResolX is the Rx or Idle resolution and is independently programmable on three values (64us, 4.1ms or 262ms),
whereas ListenCoefX is an integer between 1 and 255. All parameters are located in RegListen registers.
The timing ranges are tabulated in Table 17 below.
Table 17 Range of Durations in Listen Mode
ListenResolX
Min duration
( ListenCoef = 1 )
Max duration
( ListenCoef = 255 )
01
64us
16ms
10
4.1ms
1.04s
11
0.26s
67s
Notes - the accuracy of the typical timings given in Table 17 will depend in the RC oscillator calibration
- RC oscillator calibration is required, and must be performed at power up. See section 4.3.5 for details
Sub GHz FSK/OOK Transceiver Module DATASHEET