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 50 of 64
Example of Buzzer
’
s driving circuit
NOTE:
To correctly drive a buzzer, a driver must be provided; its characteristics depend on
the Buzzer and for them refer to your buzzer vendor.
11.8. Magnetic Buzzer Concepts
11.8.1. Short Description
A magnetic Buzzer is a sound-generating device with a coil located in the magnetic
circuit consisting of a permanent magnet, an iron core, a high permeable metal disk,
and a vibrating diaphragm.
Drawing of the Magnetic Buzzer
TR1
BCR141W
TR2
SMBT2907A
R1
4,7K
R2
1K
D1
D1N4148
C1
33pF
+
-
+V b u zze r
GPIO7