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TPS25832A-Q1:How should I connect with Carplay?

Ömer Kalayci
Prodigy 225 points
Part Number: TPS25832A-Q1

Tool/software:

Hello,

I want to create a USB charger module that can connect to the car's multimedia system and support CarPlay, but there are a few points I'm not sure about. Can you help me? I plan for the connections to be similar to the diagram below.

Q1-) What is your opinion on my connection schematic?

Q2-) I will connect the IC's power supply to the car's battery (9-16V, GND), and I plan to connect only the D+, D-, and GND pins to the multimedia system (H1 Harness). Are these pins suitable? Will not matching the Vcc-Vbus (5V) voltage between the multimedia system and the USB charger module cause a problem?

Q3-) Is it correct to take the Ground from the H1 cable harness? Because if the current flows through this cable instead of the main connector, I don't think this cable can handle it.

best regards

  • +1
    TI__Genius 10825 points

    Hi Ömer,

    Ömer Kalayci said:
    Q1-) What is your opinion on my connection schematic?

    Your block diagram generally looks correct.  You may want to consider a USB D+/D- redriver based on the distance from the CPU host to the consumer facing port.  I also don't see CC1/2 labeled from 832A-Q1 to the USB connector.  Will this be a Type-C or Type-A port?  Finally, you can delete the USB Power Load Switch since TPS25832A-Q1 will control VBUS.

    Ömer Kalayci said:
    Q2-) I will connect the IC's power supply to the car's battery (9-16V, GND), and I plan to connect only the D+, D-, and GND pins to the multimedia system (H1 Harness). Are these pins suitable? Will not matching the Vcc-Vbus (5V) voltage between the multimedia system and the USB charger module cause a problem?

    That is all acceptable.

    Ömer Kalayci said:
    Q3-) Is it correct to take the Ground from the H1 cable harness? Because if the current flows through this cable instead of the main connector, I don't think this cable can handle it.

    Include GND in H1 to ensure USB signal integrity.  It won't carry any significant current.  The GND current still goes through "main connector".

    Regards,
    Eric