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The reason is that when you inject two current levels in mode A (I1, I2 and e.g. I1>I2) and find valid signature (25K) on that mode while the current on mode B is 0, and then you inject new current level I3 on mode B while you keep I2 in mode A, you will get valid slope of 25K (I am ignoring the offset voltage for now) which means it shows a valid signature (25k) while I supposed to get invalid signature (in terms of resistance and no other parameters that defines invalid signature).
I prefer the following definition:
A single-signature PD shall present a valid detection signature, as defined in Table 145-21, on a given Mode when no voltage or current is applied on the other Mode, and shall
This definition doesn’t imply on the way how connection check is implemented weather using voltage or injecting current.”
NOTE—A valid detection signature meets every requirement in Table 145-21 across all specified conditions. A failure under any allowed conditions of Table 145-21 is considered “not a valid signature while “invalid signature” is when the requirements of Table 145-22 are met.
Chief R&D Engineer
Analog Mixed Signal Group
1 Hanagar St., P.O. Box 7220