Other Parts Discussed in Thread: TPS25831-Q1
Michael,
That you for authorizing an EVM replacement, although would appreciate the feedback on the Apple issue.
As I mentioned in the previous message, we used a non-Apple USB C to USB A connector that allowed for us to charge a number of lithium batteries, although we cannot charge an iPhone, and the Apple adaptor(s) do not work under any conditions.
I am concerned this is a larger issue, and perhaps not limited to this particular EVM. There still needs to be a resolution to the Apple issue, as the Apple adaptor(s) are not working with the EVM under any conditions for phone or battery charging.
Please address this issue, as we have requested for you to test on your EVM device that you claim works...!!
Please send us the confirmation that you were able to attach a certified Apple adaptor, and then had success in charging either an iPhone or a downstream battery.
The specs provide for (below) and is there an error in the D= D- short that should occur automatically in the EVM.
10.4.5.4 Dedicated Charging Port (DCP) Mode (TPS25831-Q1 only)
A DCP only provides power and does not support data connection to an upstream port. As shown in the following sections, a DCP is identified by the electrical characteristics of the data lines. The TPS25831-Q1 only emulates one state, DCP-auto state. In the DCP-auto state, the device charge-detection state machine is activated to selectively implement charging schemes involved with the shorted, divider3 and 1.2-V modes. The shorted DCP mode complies with BC1.2 and Chinese Telecommunications Industry Standard YD/T 1591-2009, whereas the divider3 and 1.2-V modes are employed to charge devices that do not comply with the BC1.2 DCP standard.
10.4.5.4.1 DCP BC1.2 and YD/T 1591-2009
Both standards specify that the D+ and D– data lines must be connected together with a maximum series impedance of 200 Ω, as shown in Figure 67.
This question has still not been answered from your side.
Thanks, Paul
