Rainbow-electronics GM862-QUAD-PY Manual de usuario Pagina 3
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Valorado. / 5. Basado en revisión del cliente
GM862-QUAD / PY Hardware User Guide
1vv0300748 Rev. 5 - 20/09/07
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 3 of 68
8.1 Microphone Paths Characteristic and Requirements ....................................................... 38
8.2 General Design Rules .......................................................................................................... 41
8.3 Other Considerations ........................................................................................................... 41
8.4 Microphone Biasing ............................................................................................................. 42
8.4.1 Balanced Microphone Biasing ........................................................................................................42
8.4.2 Unbalanced Microphone Biasing ....................................................................................................43
8.5 Microphone Buffering .......................................................................................................... 45
8.5.1 Buffered Balanced Mic ....................................................................................................................45
8.5.2 Buffered Unbalanced (Single Ended) Microphone .........................................................................47
9 OUTPUT LINES (Speaker) .............................................................................................. 50
9.1 Short Description ................................................................................................................. 50
9.2 Output Lines Characteristics .............................................................................................. 51
9.3 General Design Rules .......................................................................................................... 52
9.3.1 Noise Filtering .................................................................................................................................52
9.4 Handset Earphone Design ................................................................................................... 53
9.5 Hands-Free Earphone (Low Power) Design ....................................................................... 54
9.6 Car Kit Speakerphone Design ............................................................................................. 55
10 General Purpose I/O ....................................................................................................... 56
10.1 GPIO Logic levels ................................................................................................................. 58
10.2 Using a GPIO pin as INPUT ................................................................................................. 59
10.3 Using the RF Transmission Control GPIO4 ....................................................................... 59
10.4 Using the RFTXMON Output GPIO5 .................................................................................... 59
10.5 Using the Alarm Output GPIO6 ........................................................................................... 59
10.6 Using the Buzzer Output GPIO7 .......................................................................................... 60
11 ADC section .................................................................................................................... 61
11.1 ADC converter ...................................................................................................................... 61
11.1.1 Description ......................................................................................................................................61
11.1.2 Using ADC Converter .....................................................................................................................61
12 Indication of network service availability ..................................................................... 62
13 Mounting the GM862 Modules on your Board ............................................................. 63
13.1 Antenna Coaxial Cable Fixing ............................................................................................. 64
13.2 Precautions ........................................................................................................................... 65
14 Conformity Assessment Issues .................................................................................... 66
15 SAFETY RECOMMANDATIONS..................................................................................... 67
16 Document Change Log .................................................................................................. 68
- Contents 2
- 1 Overview 6
- 2 Dimensions 7
- 3.1 Description 8
- 3.2 Connectors Position 8
- 3.3.2 Antenna Connector 12
- 4 Antenna 13
- For 2,0V signals: 14
- 4.3.1 Reset signal 15
- 5 Hardware Commands 16
- 5.2.1 Hardware Shutdown 18
- RESET# 19
- Unconditional Restart 19
- 6 Power Supply 21
- 6.2 General Design Rules 22
- 7 Serial Ports 30
- 7.1 Level translation 32
- 8 Audio Section Overview 36
- GM862-QUAD / 37
- GM862-QUAD / PY 37
- Audio Paths 37
- Requirements 38
- 76,820 − 39
- 76,8207,49 −=++− 40
- G−=+− 209,40 40
- 8.2 General Design Rules 41
- 8.3 Other Considerations 41
- 8.4 Microphone Biasing 42
- 8.5 Microphone Buffering 45
- 9 OUTPUT LINES (Speaker) 50
- 9.3 General Design Rules 52
- 9.4 Handset Earphone Design 53
- GM862-QUAD / P 54
- 10 General Purpose I/O 56
- 10.1 GPIO Logic levels 58
- 11 ADC section 61
- 13.2 Precautions 65
- 15 SAFETY RECOMMANDATIONS 67
- 16 Document Change Log 68
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