User's Manual
Table Of Contents
- 1 Overview
- 2 GE864-QUAD V2 Mechanical Dimensions
- 3 GE864-QUAD V2 module connections
- 4 Hardware Commands
- 5 Power Supply
- 6 Antenna
- 7 Logic level specifications
- 8 Serial Ports
- 9 Audio Section Overview
- 10 General Purpose I/O
- 10.1 GPIO Logic levels
- 10.2 Using a GPIO Pad as INPUT
- 10.3 Using a GPIO Pad as OUTPUT
- 10.4 Using the RF Transmission Control GPIO4
- 10.5 Using the RFTXMON Output GPIO5
- 10.6 Using the Alarm Output GPIO6
- 10.7 Using the Buzzer Output GPIO7
- 10.8 Indication of network service availability
- 10.9 RTC Bypass out
- 10.10 External SIM Holder Implementation
- 11 DAC and ADC section
- 12 Conformity Assessment Issues
- 14 Document Change Log
GE864-QUAD V2 Hardware User Guide
1vv0300841 Rev.0.1 24/11/09
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 14 of 65
4 Hardware Commands
4.1 Turning ON the GE864-QUAD V2 module
To turn on the GE864-QUAD V2 the pad ON* must be tied low for at least 1 seconds and then
released.
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 GE864-QUAD V2 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 labeled with a name that
ends with a "*" .
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.
ON*
Power ON impulse
GND
R1
R2
Q1