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TPS2540: SDP device connection with CDP mode

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:

Regards, Hirotaka Inoue

  • 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.



  • Hi Donovan,

    Thanks for your answer.

    Regards, H.Inoue