User's Manual

5. Hardware Commands
5.1. Turning ON the GE865
To turn on the GE865 the pad ON# must be tied low for at least 1 second and then released.
When the power supply voltage is lower than 3.4V the pad ON# must be tied low at least 5
seconds.
The maximum current that can be drained from the ON# pad is 0,1 mA.
A simple circuit to do it is:
NOTE:
Don't use any pull up resistor on the ON# line, it is internally pulled up. Using pull up resistor
may bring to latch up problems on the GE865 power regulator and improper power on/off of the
module. The line ON# must be connected only in open collector configuration.
NOTE:
In this document all the lines that are inverted, hence have active low signals are labelled with a
name that ends with”#" or with a bar over the name.
TIP:
To check if the device has powered on, the hardware line PWRMON should be monitored. After
900ms the line raised up the device could be considered powered on.
NOTE:
It is mandatory to avoid sending data to the serial ports during the first 200mS of the module
start-up.