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TPS2543: USB Charging Questions

Megan Morris
Prodigy 80 points
Part Number: TPS2543
  1. If the maximum charging current of the our USB port is 1.5A, shall I fix  the state of the CTL1 – CTL3 as shown in the true table of the device?

  1. Can I have the explanation on how this IC works, starts from the attachment of the external portable device to the start of charging, and possibly communicate at the same time (if communication is possible during charging).

 

  1. Does the USB software of our product need to follow certain battery charging protocol to use this device?

4. Is there a simplified solution, if I just need my USB port to be able to communicate with external USB storage or mobile device, and charging the mobile device while communicating with the mobile device, with maximum current of 1.5A, and most importantly is without any software hand-shaking ? 

  • 0
    TI__Mastermind 28830 points

    Hello Megan,

    Yes, if all you are wanting to support is 1.5A of charging but you also need data capabilities, then leaving the device in the CDP charging scheme is the correct implementation.

    Our device follows the BC1.2 charging scheme. The basic idea is that when a portable device is connected to the charging port the TPS2543 is connected to, the portable device will start the detection process to determine what type of charger it is connected to. This is done solely on the D+/D- lines. The communication between the charger and portable device will look different depending on the mode you have the TPS2543 configured to (CDP, DCP, SDP). Since you have it configured as a CDP, it will follow the BC1.2 advertising sequence so that the portable device knows it is connected to a CDP charger.

    The TPS2543 does not implement any battery charging features. All it does is advertise the BC1.2 charging sequence, and act as a source power switch to supply the voltage on VBUS that is provided on VIN