USB On-The-Go

USB On-The-Go
Mechanical
Presentation
Feb 26, 2002
Agenda
w USB Topology
w Cables
w Adapters
w Connectors
Feb 26, 2002
USB Topology - 1
PC /
Root Hub
PDA
Hub
Monitor /
hub
Camera
Keyboard
w One host
w Multiple hubs and peripherals
Feb 26, 2002
Mouse
USB Topology - 2
- Standard-A
- Host
- Upstream
PC /
Root Hub
PDA
Feb 26, 2002
Hub
Monitor /
hub
Camera
Keyboard
- Standard-B
- Peripheral
- Downstream
Mouse
w Cabling forces host to peripheral connection
w Can’t connect PDA to camera
USB Cabling - 1
w Existing Cables
s-A
s-A
s-A
s-A
– Std-A to Std-B
– Std-A to Mini-B
w Mini-B added in
Feb 26, 2002
s-B
m-B
s-B
m-B
Oct 2000 for
smaller devices
USB Cabling - 2
w OTG Cables
m-AB
m-AB
m-AB
– Added Dec 2001
– Mini-A to Std-B
– Mini-A to Mini-B
w Mini-AB receptacle
– Accepts Mini-A plug
– Accepts Mini-B plug
w Devices can’t use
s-B
Feb 26, 2002
m-B
m-AB
Mini-A receptacle
Mini-AB Receptacle
A-device
B-device
PDA
Camera
m-AB
m-AB
w With Mini-AB, can connect PDA to camera
w A-device = device with Std-A or Mini-A plug
w B-device = device with Std-B or Mini-B plug
Feb 26, 2002
Cable Summary
w Four cables now specified
– Std-A to Std-B
– Std-A to Mini-B
– Mini-A to Std-B
– Mini-A to Mini-B
5m max
5m max
4.5m max
4.5m max
w Mini-A plug cables limited to 4.5m max
– Longer lengths result in transmission delay failures
when adding adapter
Feb 26, 2002
Adapters - 1
A-device
B-device
PDA
Keyboard
15cm
max
5m
max
w Adapter: Mini-A plug to Std -A receptacle
w Purpose: Allow connection to captive cable devices
w Adapter can be used with non-captive cables
Feb 26, 2002
Adapters - 2
A-device
B-device
PC
Keyboard
15cm
max
4.5m
max
w Adapter: Std -A plug to Mini-A receptacle
w Purpose: Allow connection to captive cable devices
w Adapter can be used with non-captive cables
Feb 26, 2002
Adapters - 3
w Std-B and Mini-B adapters not allowed
– Such an adapter will cause transmission delay failures
w Max adapter length = 15cm
– Longer adapter will cause transmission delay failures
– See OTG Supplement, Section 4.4
w Adapter is only legal use of Mini-A receptacle
Feb 26, 2002
Color Coding
w The following colors are mandated for the plastic
inside the mini connectors
w Connector
w Mini-A receptacle
w Mini-AB receptacle
w Mini-B receptacle
w Mini-A plug
w Mini-B plug
Feb 26, 2002
Color
White
Gray
Black
White
Black
Connector Features - 1
w 5-pin (one ID pin), 0.8mm pitch
w Smaller for portable devices
w Compliant with USB specifications
– 500 mA power
– 480 Mbps, high-speed
Feb 26, 2002
Connector Features - 2
w Increased cycle life
– Mini:
5000 mate/unmate cycles
– Standard: 1500 mate/unmate cycles
w Polarization features to prevent improper
mating
w Shielding features for EMI protection
Feb 26, 2002
Mini USB Connector
Mini-A
Plug
Receptacle
Feb 26, 2002
Mini-B
Mini-AB
Wiring Assignment
M ini USB Connector
- Assignment
Contact
Number
Signal
Name
1
VBus
Red
2
D-
White
3
D+
Green
4
ID
None
5
GND
Black
Shell
Shield
A 5
Feb 26, 2002
Typical Wiring
Assignment
Drain Wire
Cable Style Construction
Twist Signaling Pair
:AWG#28
White : DGreen : D+
Polyvinyl Chloride
(PVC) Jack
Outer Shield/
/65%
Interwoven Tinned
Copper Braid
Inner Shield
Aluminum Metallized
Polyester
Feb 26, 2002
W
Tinned Copper
Drain Wire :
#28AWG
G
R
B
Non-twisted Power Pair :
#20~28AWG
Red : Vbus
Black : Power Groung
Mini-A and Mini-B Plugs
Feb 26, 2002
Standard-A & Mini-A
Feb 26, 2002
Standard-B to Mini-A
Std-B
Mini-A
Pin 1
Pin 1
Pin 2
Pin 2
Pin 3
Pin 3
Pin 4
Pin 4
Pin 5
Shell
Shell
Feb 26, 2002
Standard-A to Mini-B
Std-A
Mini-B
Pin 1
Pin 1
Pin 2
Pin 2
Pin 3
Pin 3
Pin 4
Pin 4
Pin 5
Feb 26, 2002 Shell
Shell
Mini-A to Mini-B
Type Mini A
Type Mini B
Pin 1
Pin 1
Pin 2
Pin 2
Pin 3
Pin 3
Pin 4
Pin 4
Pin 5
Pin 5
Shell
Shell
Feb 26, 2002
Interface of Plugs
Feb 26, 2002
Standard-B & Mini-B
Feb 26, 2002
Upside Down Receptacle
Feb 26, 2002
Combo Connector
w Features - latching, power jack
w Possible application – cell phone
Feb 26, 2002
USB-IF Integrator’s List
Listed Compliant Cable & Connectors
Approved by Certified Test Labs
Members Only Events
Feb 26, 2002