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Electrical Tests
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Addressed
Examiner measures current after issuing a Set Address request to assign a non-zero address to
the device.
Maximum current must be less than 150ma.
Default
Examiner measures current after issuing a Device Descriptor request.
Maximum current must be less than 150ma.
Specification Reference
Section 11.4.1
5.2
U1 Power Consumption
Test Summary
This test verifies that the PUT’s power consumption during the U1 low-power state is within the
correct limits. Examiner will place the link into U1 from configured, addressed, and default
states, using a Link Management Packet (LMP). 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.
Examiner places the device into each device state (configured, addressed, and default) in
three separate tests before commanding the device to enter U1 in each test. Current is
measured once the link is in U1, as described below.
4.
Examiner issues a Set Link Functionality LMP with the Force_Link_PM_Accept bit set to one.
5.
Examiner issues an LGO_U1 link command.
The device must reply with an LAU link command.
6.
Examiner issues an LPMA link command to place the link into U1.
In all three tests, the device must draw less than 150ma.
