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Inquiry regarding TPS2110A USB detection

Atsushi Okui
Genius 4015 points
Other Parts Discussed in Thread: TPS2110A

Hello, all

Now we are considering to use TPS2110A, then would like to know how the system could detect the connection.

On our system, both power from USB and DC5V are supplied to this device.

We understand that this device could automatically switch either of supply to system.

However, on our system concept, the CPU need to recognize which (USB or DC) supply are connected actually.

Please let us clarify how to make the CPU to detect this matter.

If this device does not support, please let us know whether you have any other device which enables the CPU to detect.

We thank you in advance for your information.

Best regards,

  • 0
    TI__Mastermind 25296 points

    please refer to figure 14 (auto selection) and figure 15 (manual selection) in device datasheet...

    looking at the differences, you can figure out that you can use the SNS line: so normally will be IN1 connected to out when present, while when not present will be automatically IN2...

    you can then feed the same signal (SNS) to any high-Z input of the MCU to sense the analog value e figure out whether IN1 is greather than 0.8V (and then OUT = IN1) or not (OUT = IN2)...

    Vincenzo

  • 0 in reply to Vincenzo Pizzolante
    Intellectual 695 points

    Hi, I am planning to use the TPS2110A too. I want to do the OR'ing of three different Power Supplies: USB, 3.7V battery and 3.3V cell. I've studied the datasheet and seems to fit well for my purpose. However, I wanted to check with you in case I am missing something here. This is the a basic diagram of it:

    -Do you recommend special in1 and in2 capacitors to avoid excessive slew rates in hot pluggable USB and LIPO Bat?

    -A holdup capacitor in the output of 4.7uF should be enough for a max load of 35mA?

    If you see anything I'm doing wrong or you think there is a better solution for OR'ring this, please let me know

    Thanks