UMTS/HSDPA Module
UC15 Hardware Design
UC15_Hardware_Design Confidential / Released 27 / 72
Figure 7: Timing of Turning on Module
1.
Make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is
recommended
30ms.
2. USB can be used after the software running up.
3.7.2. Turn off Module
The following procedures can be used to turn off the module:
●
Normal power down procedure: Turn off the module using the PWRKEY pin.
●
Normal power down procedure: Turn off the module using command “AT+QPOWD”.
●
Automatic shutdown: Turn off the module automatically if under-voltage or over-voltage is detected.
3.7.2.1. Turn off Module Using the PWRKEY Pin
Driving the PWRKEY to a low level voltage at least 0.5s,
the module will execute power-down procedure
after PWRKEY is released. The power-down scenario is illustrated as the following figure.
NOTES
