TPS2540: SDP device connection with CDP mode

Hirotaka Inoue

Intellectual 2980 points

Part Number: TPS2540
Other Parts Discussed in Thread: TPS2546

Hi Donovan,

Does TPS2540 with CDP mode behave as SDP mode of 0.5A limit after TPS2540 recognized connected SDP device?

What is defferent from TPS2546 for this behavior?

Before thread:

https://e2e.ti.com/support/interface/usb/f/1008/t/638780

Regards, Hirotaka Inoue

over 6 years ago

0 Donovan Porter over 6 years ago

TI__Intellectual 1890 points

Hi Hirotaka,

No. The TPS2540 stays in CDP mode and will source the current that the device wants. So if an SDP is connected, the SDP will only draw a max of 500 mA for a USB2.0 device even if the current limit is set to over 1.5A. There is no difference in the TPS2546. I was mentioning that some devices such as Apple devices do not detect CDPs. The TPS2546 has a feature that allows the TPS2546 to operate as a CDP and still allow communications via USB2.0 to such devices. Section 9.1.2 on page 29 of the TPS2546 datasheet explains this is more detail.

Thanks,

Donovan

0 Hirotaka Inoue over 6 years ago in reply to Donovan Porter

TI__Intellectual 2980 points

Hi Donovan,

Thanks for your answer.

Regards, H.Inoue

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TPS2540: SDP device connection with CDP mode