3Si Security Systems Inc. GT83000A Benutzerhandbuch
GE865 Hardware User Guide
1vv0300799 Rev.15– 2012-04-23
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 16 of 77
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:
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.
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.
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.
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.
start-up.