User's Manual

HiLo3G-850 User Manual
04 March 2011 - Page 24 / 36
Figure 25: Power off sequence
Send AT COMMAND ―AT+CPOF ― to power off module.
4.2.1.1 IO DC Presence before Power on
When the VBAT is available but the module not yet started, the following I/O's raised their output.
VBACKUP raise to 3V
PWON raise to 1.8V
4.3 Power on and Sleep Diagrams
Those 2 diagrams show the behaviors of the module and the DTE during the power on and then in the sleep modes.
Note: The module cannot enter sleep mode if USB bus is connected.