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Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 18 Power supply The radio transceiver with the voltage regulator needs a good supply voltage with minimum 3.5V and a ripple of < 10mVpp. The power amplifier is directly located on the input side of the supply voltage. The transmission power is therefore to a minor degree dependant on supply voltage. When the supply is switched then the voltage has to fall back to 0V after disabling it before you can enable it again. The supply voltage has to rise from 0V to 3.5V during max 50ms so that the integrated microcontroller starts correctly. The voltage can never fall under 3.3 Volt, not even momentary. If this can’t be guaranteed then the supply has to be supervised with a voltage detector. As soon as it falls under ca. 3.3V, the input MCLR\ has to be pulled down. See application example with Demokit3. The radio transceiver without voltage regulator can operate from 2.4V to 3.6V. Keep a ripple of 3.3Volt (for standard TRX with 3.3V internal voltage regulator). The trip voltage can be reduced down to 2.3V by versions without a voltage regulator and a reduced µP clock frequency. When you follow the under the paragraph Power supply listed points then there is no external voltage detector necessary. After a reset on MCLR\Reset input, the transceiver normally needs 75ms to the output of the ready signal because the transceiver is calibrated and configured automatically after a reset. The ready signal will only be output if the module is in the configuration mode. Status LED The status of the transceiver-LED is defined by the command power-control. When that command accomplished with a set Bit7 then the LED will enable or disable by a powerup accordingly. After a sleep-command the LED is always turned off and after the wakeup the LED is always set back to the status it had before the sleep.
Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 19 Temperature sensor The transceiver module has an internal temperature sensor. The current temperature can be read by the command “READ temperature”. The value range is in between -40°C to +115°C. The temperature is actualized every 5s, no matter how often it is read. Note The 5s-timer for the actualization of the temperature is stopped during the sleep. After the sleep, the temperature which was read before the sleep can therefore be displayed for 5s. This temperature can differ from the current temperature by a long sleep-time.
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