1. Greg Bell Business Development Mgr Industrial & Security Markets
Digital Camera Standards
USB2
Greg Bell
Business Development Mgr
Industrial & Security Markets
1/1/2019

2. Introduction
“The Universal Serial Bus (USB) has been the most successful interface in the history of PCs”
--Brian O’Rourke, Cahners In-Stat
1/1/2019

3. Topics of Discussion Why chose USB? USB1 vs. USB2 Technical Comparison
USB Terminology
Multi-Camera set-up
Limitations and Benefits of USB2
Real-Life Applications
Upcoming Trends
Q & A
1/1/2019

4. Why choose USB2 2 Billion USB enabled devices (InStat) Plug and Play
Reliable
Good Performance
Software Control
Reduce Development and Support costs
Lower Cost
Growing at over 500 million per year
2 categories, hosts and peripherals (all devices that attach to hosts)
Hosts cannot connect to hosts, peripherals not to peripherals
Low Power
Smaller Size
Standard Cable
15% faster than FW, X5 greater throughput than fast Ethernet
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5. USB1 versus USB2 12 Mbps vs 480 Mbps Pentium4 based processors
O/S Support
Backward Compatibility
Intel P4 chipsets and newer all have embedded USB2 enhanced host controller interface abd hub, capable of supporting 6 high speed ports. Other processors from AMD provide for the same.
Official support on .net, XP and Win MS offers that it will be with all future versions of windows.
Custom drivers and ??? To ensure compatibility with ME, 98,
Class drivers???
Same Topology, power, cables, connectors
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6. Technical Comparison
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7. Clarifying USB Terminology
USB1.1 “Low Speed” 1.5Mbps
USB1.1 “Full Speed” 12Mbps
USB “High Speed” 480Mbps
“Advanced” Property Manager
“Enumeration”
USB On-The-Go
Enumeration Sequence – PC or master makes requests to peripherals. Initially connects as a full speed device. The device than signals it is high speed capable. Host saves this information of power and bandwidth needs into the device driver. Process called Enumeration.
Driver Stacks
On the go protocols. Connectivity for mobile devices.
Allows product to be both host and peripheral and switch on demand
Only one side needs to be OTG, allowing interconnectivity with installed base
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8. Clarifying USB Terminology
Data Transfer Methods
Interrupt
Bulk (guaranteed delivery)
Isochronous (guaranteed bandwidth)
Mouse or keyboard type appliances
Guaranteed latency, unidirectional stream pipe, error detection
Isochronous from the Greek words “equal” and “time”: Guaranteed bandwidth…fast, steady, uninterrupted data stream. Error checking often omitted.
512 byte packets, max of 13 packets per microframe, equalling a total of 53 Mb/s
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9. Multi-camera set-up Up to 127 Cameras Star Topology
X6 USB2 port Host Computer
Simultaneous Image Capture
Camera Memory Buffer
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10. Limitations of USB2 5m cable length Cable extenders Hub / Repeater
Optical Repeater to come?
500mA bus power
External power
Master-Slave Topology
Moderate Bandwidth
1/1/2019

11. Benefits of USB2 Standard PC Interface Standard Peripherals
Standard Cable
Common Interfaces
DirectX / Direct Show
WDM
API
Faster Integration
Growing Trend
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12. Part Scanning Problem: Reduce Costs Minimize HW Solution: 2 Cameras
Ext Dynamic Range
Inventory / Slag decision
Embedded host computer
1/1/2019

13. Label Inspection Problem: Print errors Small - Large Formats
300 dpi over 20”
X-Y robot stage
Solution:
21 megapixel USB2 camera
1/1/2019

14. Scientific Documentation
Simplicity
Std PC Interface
1/1/2019

15. X-Ray Applications Higher bit depth Not speed critical 1/1/2019

16. Upcoming Trends More supplier choices Higher resolution Faster speeds
HW / SW integration
Greater market adoption
New applications and markets
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17. Questions and Answers
1/1/2019