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 46 of 65
10.1 GPIO Logic levels
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic levels.
The following table shows the logic level specifications used in the GE864-QUAD V2 interface circuits:
Absolute Maximum Ratings
Parameter Min Max
Input level on any digital pin when on -0.3V +3.1V
Input voltage on analog pins when on -0.3V +3.0 V
Operating Range - Interface levels (2.8V CMOS)
Level Min Max
Input high level 2.1V 3.1V
Input low level 0V 0.5V
Output high level 2.2V 3.0V
Output low level 0V 0.35V
For 1,8V signals:
Operating Range - Interface levels (1.8V CMOS)
Level Min Max
Input high level 1.6V 2.2V
Input low level 0V 0.4V
Output high level 1,65V 2.2V
Output low level 0V 0.35V