The detail power on/off, reset, shutdown logic of EFM8SB10F2G on NX development board

Hi, I’m designing our board based on NX module, and take the developement board as reference. I have several questions about the power event handling.

  1. How the EFM8SB10F2G handle the SYS_RESET event?
  2. Where I can find the detailed information about how the chip handle various power events?


EFM8SB10F2G does not handle SYS_RESET, it only controls POWER_EN.

The SYS_RESET is routed to EFM8 through the level shifter U23, then how EFM8 response to this event, simply ignore it?


EFM8 only handle the BUCK_3V3_EN as need. During power on, SYS_RST hold the 3V3 of carrier low.

Okay, I see both SYS_RESET and EFM8 can control BUCK_3V3_EN now. But in what situation the EFM8 will toggle the BUCK_3V3_EN?


When module generates a reset to carrier board, it will hold that low.