SI4438 Wireless Module
User Manual of E30 Series Modules
Copyright ©2012–2017, Chengdu Ebyte Electronic Technology Co., Ltd.
9
/
17
5.5 Reset
When the module is powered, AUX outputs low level immediately, conducts hardware self-check and sets the operating mode on the basis of the
user parameters. During the process, the AUX keeps low level. After the process completed, AUX outputs high level and starts to work as per the
operating mode combined by M1 and M0. Therefore, the user needs to wait the AUX rising edge as the starting point of module’s normal work.
5.6 AUX Description
AUX Pin can be used as indication for wireless send & receive buffer and self-check. It can indicate whether there are data that are not sent yet via
wireless way, or whether all wireless data has been sent through UART, or whether the module is still in the process of self-check initialization.
5.6.1 Indication of UART Output
To wake up external MCU:
5.6.2 Indication of Wireless Transmitting
Buffer (empty): the internal 512 bytes data in the buffer are written to the RFIC (Auto sub-packaging).
When AUX=1, the user can input data less than 512 bytes continuously without overflow. Buffer (not empty): when AUX=0, the
internal 512 bytes data in the buffer have not been written to the RFIC completely. If the user starts to transmit data at this
circumstance, it may cause overtime when the module is waiting for the user data, or transmitting wireless sub package.
Notes: When AUX = 1, it does not mean that all the UART data of the module have been transmitted already, perhaps the last packet
of data is still in transmission.
