GE9
GE9
GE9
GE910 Hardware User Guide
10 Hardware User Guide
10 Hardware User Guide
10 Hardware User Guide
1vv0300962 Rev.4 2012-06-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 17 of 73
Mod. 0805 2011-07 Rev.2
4.
Hardware Commands
4.1.
Turning ON the GE910
To turn on the GE910 the pad ON-OFF* must be tied low for at least 5 seconds and then
released.
The maximum current that can be drained from the ON-OFF* pad is 0,2 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 GE910 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. The
device is powered on when PWRMON goes high.
NOTE:
It is mandatory to avoid sending data to the serial ports during the first 200mS of the module
start-up.
