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Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 14 Recalibration The VCO has to be recalibrated by a temperature variation of >40°C or by a variation of the supply voltage of > 0.25 volt (for version without voltage regulator). It can be calibrated automatically in defined intervals from 5 to 150min, by temperature differences of more than 20°C or just once manual during the calibration command. During the calibration, which normally takes 50ms, no radio communicationl is possible. Beginning, end and result will be reported if the module is in the configuration mode. There occurs an automatic calibration with every power up. The last calibration stays stored in the RAM during the sleep. Therefore the transceiver is ready again pretty fast after the wakeup (by 19.2kbits/s RF data rate after 3ms, by 2.4kbits/s RF data rate after 5ms). When the temperatures or the supply voltage can change significantly during the sleep then you first have to recalibrate after the wake up. Energy-saving mode and characteristics by reset, power up, wake up und sleep The RF-part of the transceiver can be enabled and disabled with the command Power-control, as well as the LED. Disabled, the current consumption is highly reduced but the processor still stays active and uses electricity. The sleep command is for battery operated units which are mostly inactive and which may just use electricity during the radio communication. Thereby the current consumption can be reduced down to 3µA (version without intern voltage regulator) during the sleep. The version with voltage regulator uses ca. 100µA while sleeping. During the sleep, the transceiver is inactive but all the configurations and the last calibration remain in the RAM. High reserve energy is achievable due to the low current consumption during the sleep and the short setuptime after a wakeup of 3ms by 19.2kbits/s RF data rate respectively 5ms by 2.4kbits/s RF data rate because the average of the current consumption depends almost only on the proportion transmitting time/transmitting interval. The sleep command disables the RF-part and the LED and stops afterwards the clock of the micro controller. The behavior during the sleep as well as the behavior after a wakeup can be defined with the command parameter WKUP_mode of the sleep command. The timer for automatic recalibration is paused during the sleep. The WKUP-Pin has to be on its sleep-level (high or low) before the sleep but at the latest 50µs after the answer to the sleep command. Afterwards, the change in level automatically activates an immediate wakeup. The command power up mode is similar to the sleep command. The sleep command is performed immediately, the command power up mode doesn’t affects until the next power up. The transceiver can be configured with PWUP_mode so that it automatically changes to the sleep mode after the power up until it’s awoken and reconfigured from outside. This is important in battery operations so that the radio module doesn’t get active autonomously after a battery change and discharges the battery unnoticed. The sleep mode finishes through a pinchange on the WKUP-Pin. Thereby, the program either continues where it was interrupted by the sleep-command or there is an internal reset whereat a complete re-start occurs. When the transceiver is in the configuration mode (MODE-Pin = High) then it shows by “REPORT READY” on the RS232 that the microcontroller on the transceiver is ready. Alternatively, the RTS-Pin can be supervised. The RTS-Pin goes back to high after the sleep-command. The RTS-Pin is set back to low as soon as the transceiver is ready again after a wakeup (see figure 12 and 13).
Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 15 RTS-pin MODE-pin and WKUP-pin resp. RS232, RxD-pin RS232, TxD-pin 0B0H 020H sleepcommand change to config-mode 021H answer (only sent if still in config-mode) 020H 021H enter sleep 030H wakeup (pinchange on WKUP-pin) max. 50us for pinchange, otherwise interpreted as wakeup 001H ready after wakeup (only sent in config-mode) ready after wakeup Figure 12 Sleep and wake up with configuration mode after wake up RTS-pin MODE-pin and WKUP-pin resp. RS232, RxD-pin RS232, TxD-pin 0B0H 020H sleepcommand change to config-mode 021H answer (only sent if still in config-mode) 020H 021H enter sleep 030H wakeup (pinchange on WKUP-pin) Figure 13 Sleep and wakeup with data mode after wake up 001H ready after wakeup ready after wakeup (suppressed because in data-mode) The transceiver module will report after ca. 175ms with a ready signal over RS232 after a power up if the transceiver module is in the configuration mode. A negative edge on the RTS-Pin can be used alternatively to it as a ready signal (see figure 14 respectively figure 15). VCC RTS-pin MODE-pin RS232, TxD-pin VCC on change to config-mode 030H 000H ready ca. 175ms after powerup ready ca. 175ms after powerup (only sent in config-mode) Figure 14 Powerup with transceiver module in configuration mode
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