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TI, TPS2546 CDP or DCP mode Question

Carl Ko
Intellectual 340 points
Other Parts Discussed in Thread: TPS2546

Our charging and communication equipmnet :  Galaxy Tap, Tap Pro

 

Our development equipmnet is working with DCP mode and CDP mode.

DCP mode can work charging 1.5A for +5Volt adapter.

And Consumes a current of up to 980mA, CDP mode to communicate.

 

DCP is that it has the support 1.5A.How we will be changed 980mA to 1,500mA?

(Setting TPS2546, ILIM_LO=80.6K, ILIM_HI=16.9K, Was confirmed by changing the resistance value, but is the same)

How to enter forcibly DCP 1.2V Charging?

 

(Our Company Mode is CTRL1, CTRL2, CTRL3, ILIM_SEL: 0111(DCP_auto), 1111(CDP).

It is a situation or to charge the device with and communicating.

 

 

  • 0
    TI__Prodigy 650 points

    Carl,

    First let me confirm your test result:

    DCP mode, 1.5A.

    CDP mode, 980mA and correct data communication.

    Your question is whether you can have CDP mode charging current increase from 980mA-1.5A, am I right?

    CDP mode, BC1.2 requirement: Host side must be 1.5A min ability, devices side 1.5A max (can't pull over 1.5A)

    It really depends on device side how much current they need under CDP. As your test result is 980mA+ data, which means the CDP handshakeing with device and CDP host has successfully finished, as charging current is >500mA (SDP). But it's device's choice to charge 980mA not to 1.5A. TPS2546 has done CDP handshake with it, it's the device side decide how much current they need.

    Examples:

    iPhone5/5S supports CDP fast charge, they charge 1A under CDP, already higher than 500mA, but they don't go up to 1.5A.

    iPad4/Air can also support CDP fast charge, they charge 1.4A, close to 1.5A under CDP.