Electrical Tests
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5.
Electrical Tests
Some tests are conducted in three different device states (Default,
Addressed, and Configured). Expected results for each state tested
may vary.
Default State: The device is attached, powered, but has not been
assigned a unique address. Device responds at the default address
(0).
Addressed State: Device is attached, powered, and has been
assigned a unique (non-zero) address, but has not been configured.
Configured State: Device is attached, powered, has been assigned a
unique (non-zero) address, and has been configured by Examiner to
use the function provided by the device.
5.1
U0 Power Consumption
Test Summary
This test verifies that the PUT’s power consumption during U0 is within the correct limits for
configured, addressed, and default states. Examiner will report current, power, and VBus for
each test.
Test Steps and Expected Results
1.
Examiner brings the link to the U0 state.
2.
Examiner issues one or more standard descriptor requests.
3.
Current is measured in the three states shown below (in three separate tests):
Configured
Examiner measures current after issuing Set Address(1) and Set Configuration(1) requests.
Maximum current must be less than 900ma.
