`Date: 10/20/2000
`
`Reason for ECN:
`The USB 2.0 specified device-side connector – the B connector – is too large for use with
`a new generation of handheld and mobile devices, e.g., cell phones which would benefit
`from connectivity to the PC. This ECN incorporates a specification of a device-side mini
`connector (hereafter referred to as a mini-B connector). The new connector only applies
`to upstream facing ports, i.e., connectors on devices.
`
`Summary of ECN:
`The bulk of the ECN specifies the mechanical requirements for the mini-B plug,
`receptacle and cable assembly. It also identifies the usage scope of this connector. The
`last part of the ECN describes the minimum test criteria and performance requirements
`for the new connector.
`
`Benefits of ECN:
`The ECN enables standardization of miniature device-side USB connectors and
`consequent economies of scales and lower cost for a new and growing class of devices
`which will benefit from connectivity to the PC. The standardization also allows
`leveraging of the compliance test and certification model which is already in place for
`USB connectors.
`
`Assessment of Impact on Current Specification and Current USB Products:
`The connector specified in the ECN will not have any impact on hardware or software of
`existing USB products. The current USB spec already allows for vendor-specific device
`side connectors – such cable assemblies are called captive assemblies. All that the ECN
`does is to identify one such connector for use in devices which need the smaller size of
`connector. There is a potential for some end-user confusion because of two standard
`cable options; but this can be mitigated by appropriate end-user education.
`
`Structure of ECN:
`The ECN is in the form of a new Chapter 6 with the mini-B connector requirements
`inserted into the appropriate locations. This format enables specification of the new
`connector in context.
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`Universal Serial Bus Specification Revision 2.0
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`Chapter 6
`Mechanical
`
`This chapter provides the mechanical and electrical specifications for the cables, connectors, and cable
`assemblies used to interconnect USB devices. The specification includes the dimensions, materials,
`electrical, and reliability requirements. This chapter documents minimum requirements for the external
`USB interconnect. Substitute material may be used as long as it meets these minimums.
`
`6.1 Architectural Overview
`The USB physical topology consists of connecting the downstream hub port to the upstream port of another
`hub or to a device. The USB can operate at three speeds. High-speed (480 Mb/s) and full-speed (12 Mb/s)
`require the use of a shielded cable with two power conductors and twisted pair signal conductors. Low-
`speed (1.5 Mb/s) recommends, but does not require the use of a cable with twisted pair signal conductors.
`
`The connectors are designed to be hot plugged. The USB Icon on the plugs provides tactile feedback
`making it easy to obtain proper orientation.
`
`6.2 Keyed Connector Protocol
`To minimize end user termination problems, USB uses a “keyed connector” protocol. The physical
`difference in the Series “A” and “B” (or “mini-B”) connectors insures proper end user connectivity. The
`“A” connector is the principle means of connecting USB devices directly to a host or to the downstream
`port of a hub. All USB devices must have the standard Series “A” connector specified in this chapter. The
`“B” (or “mini-B”) “B” connector allows device vendors to provide a standard detachable cable. This
`facilitates end user cable replacement. Figure 6-1Figure 6-1 illustrates the keyed connector protocol.
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`6.5.2 USB Connector Termination Data
`Table 6-1Table 6-1 provides the standardized contact terminating assignments by number and electrical
`value for Series “A” and Series “B” connectors.
`
`Table 6-1. USB Series “A” and Series “B” Connector Termination Assignment
`
`Contact
`Typical Wiring
`Number
`Assignment
`
`Signal Name
`
`
`
`1
`
`2
`
`3
`
`4
`
`Shell
`
`VBUS
`
`D-
`
`D+
`
`GND
`
`Shield
`
`Red
`
`White
`
`Green
`
`Black
`
`Drain Wire
`
`Table 6-2 provides the standardized contact terminating assignments by number and electrical value for
`Series “mini-B” connectors.
`
`
`
`Table 6-2. USB Series “mini-B” Connector Termination Assignment
`
`Contact
`
`
`Typical Wiring
`
`
`Number
`
`
`Assignment
`
`
`
`
`Signal Name
`
`
`
`1
`
`2
`
`3
`
`4
`
`5
`
`
`
`Shell
`
`
`
`
`
`
`
`VBUS
`
`D-
`
`
`
`D+
`
`ID
`
`
`
`GND
`
`
`
`
`
`Shield
`
`
`
`Red
`
`
`
`
`
`White
`
`
`
`
`
`Green
`
`
`
`not connected
`
`
`
`
`
`
`
`Black
`
`
`
`Drain Wire
`
`
`
`
`6.5.3 Series “A” and Series “B” (or “Mini-B”) “B” Receptacles
`
`Electrical and mechanical interface configuration data for Series "A" and Series "B" receptacles are shown
`in Figure 6-7Figure 6-9 through Figure 6-12 and Figure 6-8. Also, refer to Figure 6-12Figure 6-17 through
`Figure 6-20, Figure 6-13, and Figure 6-14 at the end of this chapter for typical PCB receptacle layouts.
`
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