RF-43UP
www.szrfstar.com V1.3 - Jan., 2020
Shenzhen RF-star Technology Co., Ltd. Page 16 of 34
5.4 Wake-up Mode
When S0 = 0 and S1 = 1, the module works in wake-up mode.
The conditions for the module to start packet transmission and the EN function are the same as the
EN function. The only difference is that the module will automatically add a wake-up code before
each packet. The length of the wake-up code depends on the wake-up time set in the user
parameters. The purpose of the wake-up code is to wake up the receiving module working in the
low power consumption mode. Therefore, the data transmitted in the wake-up mode can be used in
the normal mode Module received in wake-up mode and low power consumption mode.
The conditions under which the module initiates a packet transmission and the EN functions are
equivalent to normal mode. The only difference is that the module automatically adds a wake-up
code before each data packet, and the length of the wake-up code depends on the wake-up time
set in the user parameters. The purpose of the wake-up code is to wake up the receiving module
working in the low-power mode. Therefore, the data transmitted in the wake-up mode can be
received by the module in the normal mode, wake-up mode, and low-power mode.
Equivalent to normal mode.
When S0 = 1 and S1 = 0, the module works in low-power mode
The module is in sleep state, the serial port is closed, and it cannot receive the serial port data from
the external MCU, so this mode does not have the function of wireless transmission.
In the low-power mode, the transmitter is required to work in the wake-up mode. When the wake-
up code is monitored regularly, once the effective wake-up code is received, the module will continue
to be in the receiving state and wait for the whole effective packet to be received. Then the EN
outputs the low Level, after a delay of 5 ms, open the serial port to send the wireless data received
through TXD, and the EN outputs the high when finished. The wireless module continues to enter
the "sleep-monitor" working state, by setting different wake-up time, the module has different receive
response delay (maximum 2 s) and average power consumption (minimum 30 A).
When S0 = 1 and S1 = 1, the module works in sleep mode
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