Unigraf UCD-240, User Manual

Page: 35 / 78

UCD Console for UCD-340 User Manual | Unigraf Oy
35.
DUT as Power Source
This test verifies operation Vbus and GND lines for short-circuit and open-circuit failures.
During the test, TE will operate as power sink and selects only
vSafe5V PDO for power
contract. In order to run this test, the DUT must support Power Source role.
In the start of the test TE temporarily disconnects the CC lines to simulate a re-plug event
and waits for Power Contract to be established
After Power Contact has been established TE will wait for the delay stated in Power
measurement delay parameter and measures the current in Vbus and GND lines and the
voltage of Vbus. The purpose of the delay is to allow the DUT time to stabilize its power
consumption.
Note The test assumes that the current flows through the four separate Vbus and GND lines
evenly. Since current measurements are done sequentially, any variance in DUT power
consumption during the measurement can cause this test to fail.
Total currents are calculated for Vbus, and for GND. The difference in the measured values
of the four connections may not exceed the programmed deviation limits.
For PASS result, the measured Vbus voltage, Vbus current and GND line current must be
within the ranges defined by provided parameters.
Important In order to run this test with UCD-340, Unigraf Electrical Test Cable must be used and
Electrical Testing feature enabled with a corresponding license.
Parameters in use
Parameters in use
 Test timeout (default 5 000 ms)
 DUT Capabilities flags (default 7)
Bits Description
0 DUT Support for DisplayPort Alt Mode (1 Yes, 0 No)
1 DUT can act as power source (1 Yes, 0 No)
2 DUT can receive power from TE (1 Yes, 0 No)
31:0 Reserved
 R-plug duration (default 1 500 ms)
 DUT attach timeout (default 10 000 ms)
 Power Contract timeout (default 10 000 ms)
 Vbus voltage low limit (default 4 750 mV)
 Vbus voltage high limit (default 5 500 mV)
 Vbus current deviation (between wires) (default 100 mA)
 Return (GND) current deviation (between wires) (default 100 mA)
Measurement delay (default 2 000 ms)