Version List

Transceiver module TRX433-10C2 / TRX868-10C2 (Vers. 1.0E) 46
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Functional name WRITE sleep Function 20H
Functional call 0B0H, 20H, WKUP_mode
Answer 20H, WKUP_mode (Bit register)
Sets the whole transceiver in the sleep-mode to save energy. Transceiver and LED will be disabled and the
clock of the micro controller will be stopped.
The WKUP-Pin has to be on its sleep-level (high or low) before the sleep command but the latest 50µs after
the answer to the sleep command. Afterwards a level change starts immediately a wake up.
The individual bits of the PWUP_mode define the behavior of the transceiver during the sleep as well as
after the wake up. These configurations are important for the battery operation.
WKUP_mode, bit0 = 0: Wake up starts a soft-reset, i.e. program will restart.
WKUP_mode, bit0 = 1: Continue after Wakeup, i.e. program resumes where it was before the sleep.
WKUP_mode, bit1: unused, reserved for wake up
WKUP_mode, bit2: unused
WKUP_mode, bit3: unused
WKUP_mode, bit4: unused, reserved for sleep-state
WKUP_mode, bit5 = 0: sets all Pins except WKUP-pin during the sleep on output with Low-level.
WKUP_mode, bit5 = 1: all Pins stay unchanged
Sleep can be stopped with the WKUP-Pin. For that a change in level has to appear at the WKUP-Pin. The
transceiver answers after the wake up with the READY-signal 30H, 01H (the READY-signal will only be
output if the transceiver is in the configuration mode).The pins CTS and RxD become inputs again if they
were set on output during the sleep.
The pin can be supervised alternatively to the READY-report 30H, 01H-pin. The RTS-pin changes to high
after the sleep-command. When the transceiver is ready again after a wake up then the RTS-pin is set on
low again. Therefore you can also use a negative slope on the RTS-Pin as a ready signal.
The last calibration data are still active after a wake up. If they are not valid anymore after the wake up (e.g.
because of great temperature change) then you have to recalibrate. By soft-reset, it calibrates and sets the
configuration of the EEPROM automatically. That’s why the transceiver takes about 75ms to get ready after
the soft-reset, compared to the Continue after a wake up which doesn’t calibrate automatically and is
therefore ready after 3ms (by 19.2kbit/s RF data rate) respectively 5ms (by 2.4 kbit/s RF data rate).
All timers are stopped for automatic outputs etc. during the sleep and won’t continue running until a wake up.
Time controlled outputs therefore just result as expected when the sleep command isn’t used.
See function WRITE power up mode as well as the paragraph save current consumption.
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