User's Manual
Table Of Contents
- GC864 QUAD V2andGC864 DUAL V2Hardware User Guide
- APPLICABILITY TABLE
- 1 Introduction
- 2. Overview
- 3. GC864 Mechanical Dimensions
- 4. GC864-QUAD V2 / GC864-DUAL V2 Module Connections
- 5. Hardware Commands
- 6. Power Supply
- 7. Antenna
- 8. Logic Level Specifications
- 9. Serial Ports
- 10. Audio Section Overview
- 11. General Purpose I/O
- 11.1. GPIO Logic Levels
- 11.2. Using a GPIO Pad as INPUT
- 11.3. Using a GPIO Pad as OUTPUT
- 11.4. Using the RF Transmission Control GPIO4
- 11.5. Using the RFTXMON Output GPIO5
- 11.6. Using the Alarm Output GPIO6
- 11.7. Using the Buzzer Output GPIO7
- 11.8. Magnetic Buzzer Concepts
- 11.9. Using the Temperature Monitor Function
- 11.10. Indication of Network Service Availability
- 11.11. RTC Bypass Out
- 11.12. DAC Converter
- 11.13. ADC Converter
- 12. Assembly the GC864-QUAD V2 / GC864-DUAL V2 on the Board
- 13. Packing System
- 14. Conformity Assessment Issues
GC864 Hardware User Guide
1vv0300874 Rev.0 – 2010-01-25
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved. Page 47 of 64
Not all GPIO pads support all these three modes:
• GPIO2 supports all three modes and can be input, output, Jamming Detect
Output (Alternate function)
• GPIO4 supports all three modes and can be input, output, RF
Transmission Control (Alternate function)
• GPIO5 supports all three modes and can be input, output, RFTX monitor
output (Alternate function)
• GPIO6 supports all three modes and can be input, output, alarm output
(Alternate function)
• GPIO7 supports all three modes and can be input, output, buzzer output
(Alternate function)
11.1. GPIO Logic Levels
Where not specifically stated, all the interface circuits work at 2.8V CMOS logic
levels.
The following tables show the logic level specifications used in the GC864-QUAD V2 /
GC864-DUAL V2 interface circuits:
Absolute Maximum Ratings –Not Functional
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