User Manual

MeiG_SLM550_Hardware Design Manual
MeiG Smart Technology Co., Ltd 41/89
4.2.2 Module Shutdown
Users can use the PWRKEY pin to shut down.
4.2.2.1 PWRKEY Shutdown
The user can turn off the PWRKEY signal by pulling it down for at least 3 seconds. The shutdown circuit
can refer to the design of the boot circuit. After the module detects the shutdown action, a prompt
window pops up on the screen to confirm whether to perform the shutdown action.
The user can achieve a forced shutdown by pulling PWRKEY down for a long time, pulling down for at
least 15 seconds.
4.2.3 Module Reset
The SLM550 module supports a reset function that allows the user to quickly restart the module by
pulling the RESET_N pin（225） of the module low. The recommended circuit is as follows:
Figure 15 Reset using the key circuit
Figure 16 Reset Module Using External Signal
When the pin is high, the voltage is typically 1.8V. Therefore, for users with a level of 3V or 3.3V, it is