Mandate: Required
Effective Date: September, 2025
Effective immediately the USB-IF is introducing a BC 1.2 test procedure as an alternative to the MQP PET BC 1.2 automated tests. The intention of this procedure is to provide a minimal testing approach to validating BC 1.2 compliant behavior in products seeking USB-IF certification. The procedure verifies the following behaviors:
Objectives
Portable Devices:
- Products seeking USB-IF certification may implement BC 1.2 as a Portable Device but the capability will not be tested as part of certification.
Charging Downstream Ports (CDP):
- A Charging Downstream port shall maintain a minimum of 4.75V on VBus when current load is 1.5A.
Dedicated Charging Ports (DCP)
- A Dedicated Charging port shall maintain a minimum of 2.0V on VBus when current load is between 500mA and 1.5A
- A Dedicated Charging Port shall have a 200Ohm MAX shunt between D+ and D-
Equipment
The BC 1.2 test procedure uses the following products to demonstrate BC 1.2 functionality.
- Drop Droop fixture - https://fixturesolution.com/product/usb-2-0-3-1-bc1-2-vbus-drop-droop/
- Digital multi-Meter
- Spliced USB Cables
- USB Host
- Various USB Cables
- For USB Type-C Receptacle DCPs/CDPs - USB Type-C plug to Standard-A receptacle adapter
- Generic Breakout Board
Test Procedures
Charging Downstream Port (CDP) DUT
1. If CDP is part of a stand-alone hub/dock, connect the UFP of the hub/dock to a host PC using appropriate USB Cable. Ensure external power is connected and the power switch is turned on.
a. Drop/Droop - Follow Drop/Droop Test Procedure found here.
i. This test is informational for silicon certifications.
ii. This test is normative for end-product and reference design certifications.
iii. This test is performed on each CDP capable port
Dedicated Charing Port DUT
1. If DUT has a UFP, do not connect the UFP to a host PC. Ensure external power is connected to DUT and the power switch is turned on.
2. Drop/Droop - Follow Drop/Droop Test Procedure found here.
a. This test is informational for silicon certifications.
b. This test is normative for end-product and reference design certifications.
c. This test is performed on each DCP capable port
3. D+/D- Shunt Resistor Measurement
a. If USB Type-C Receptacle:
i. Using a spliced USB Type-C cable or generic breakout fixture, connect the USB Type-C plug to the USB Type-C receptacle of the DUT.
ii. Using a multimeter measure the resistance between the D+/D-
1. The product passes if the resistance is less than or equal to 200Ohms.
b. If USB Standard-A receptacle:
i. For each DCP port:
1. Using a spliced USB Standard-A cable or generic breakout fixture, connect the Standard A plug to the Standard-A receptacle of the DUT.
2. Using a multimeter measure the resistance between the D+/D- pigtails of the spliced Standard-A cable
a. The product passes if the resistance is less than or equal to 200Ohms
c. If USB-C Captive Cable:
i. Using a breakout fixture, connect the captive cable to the breakout fixture
ii. Using a multi-meter measure the resistance between the D+ and D- pins.
1. The product passes if the resistance is less than or equal to 200Ohms.
Top Mandate: Optional
Effective Date: March, 2007
In response to the growing popularity of battery powered devices that use USB to charge their batteries, the USB Promotor Group has created a USB Battery Charging Specification. The "Battery Charging Specification" enables downstream ports of hosts and hubs to be chargers and defines a means for peripherals to detect them. The specification also defines a dedicated USB charger. The Battery Charging Specification can be downloaded from the Approved Class Specification webpage at http://www.usb.org/developers/devclass_docs#approved .
The USB-IF has no plans to offer certification to USB Chargers at this time.
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Engineering and Technical Services Group