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UBX-G7020
u-blox UBX-G7020 User Manual
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UBX-G7020 - Har
dware Integrat
ion Manual
Appendix
GPS.G7-
HW
-
10003
Objective Specifi
cation
Page
65
o
f
74
A.2
Best perfo
rmance circuit
1.8V
TCXO suppl
ied by LDO_X_
OUT
External LNA
RTC crystal
Filtering for LNA supply
UART and DDC inte
rface
Figure
30
:
Best performance
circuit
VDD_IO supply must be h
igher than 2.1V
because of
1.8V TCXO used
.
Confidential
64
66
Table of Contents
Preface
3
Contents
5
Table of Contents
5
1 Hardware Description
8
Overview
8
Architecture
8
2 Design-In
9
Power Management
10
Power Domains
10
Supply Voltages
12
Built in Supply Monitors
15
Operating Modes
15
Pios
16
SQI Flash Memory
17
Configuration Pins
18
Communication Interfaces
19
Time Pulse
21
External Interrupt
21
SAFEBOOT_N Pin/ Safe Boot Mode
21
Active Antenna Supervisor
22
System Reset
24
Clock Generation
25
Clock Accuracies and Tolerances
25
Crystal or TCXO Package Selection
26
Frequency Perturbations
26
Crystal Oscillator
27
Tcxo
28
Real-Time Clock (RTC)
30
RTC Using a Crystal
30
RTC Derived from the System Clock; "Single Crystal" Feature
30
RTC Using an External Clock
30
Time Aiding
30
RF Front-End
32
General Notes on Interference Issues
32
RF Front-End Circuit Options
34
Usb
38
Jtag
39
Layout
40
Placement
40
Package Footprint, Copper and Solder Mask
40
System Configuration
43
Communication Interface Configuration
43
Low Level Configuration
43
Functional Configuration
47
Functional Configuration at Run Time
47
3 Component Selection
48
Tcxo (Y1)
48
Crystal (Y2)
50
RTC Crystal (Y3)
51
SQI Flash (U3)
51
RF Band-Pass Filter (F1)
51
External LNA Protection Filter (F2)
52
USB Line Protection (D1)
52
Usb Ldo (U3)
52
External LNA (U1)
52
LNA_IN ESD Protection Diode (D1)
53
Operational Amplifier (U6)
53
Open-Drain Buffer (U4, U7 and U8)
53
Antenna Supervisor Switch Transistor (T1)
53
RF Inductors
53
Inductor for DCDC Converter (L2)
54
Standard Capacitors
54
Standard Resistors
55
Ferrite Beads (FB1)
55
Feed-Thru Capacitors
55
4 Design-In Checklists
56
Pin List
57
Schematic and Bill of Material Design-In Checklist
58
Layout Design-In Checklist
58
5 Production
60
Packaging, Shipping, Storage and Moisture Preconditioning
60
ESD Handling Precautions
60
Soldering
60
Production
61
Set the Low Level Configuration and Program the Optional SQI Flash
62
Test the GPS/GNSS Performance
63
System Monitoring
63
Appendix
64
A Reference Schematics
64
Cost Optimized Circuit
64
Best Performance Circuit
65
Power Optimized Circuit
66
Improved Jamming Immunity
67
1.8V Design Using TCXO
68
Circuit Using Active Antenna
69
USB Self-Powered Circuit
70
USB Bus-Powered Circuit
71
Circuit Using 3-Pin Antenna Supervisor
72
Related Documents
73
Revision History
73
Contact
74
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u-blox UBX-G7020 Specifications
General
Brand
u-blox
Model
UBX-G7020
Category
GPS
Language
English
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