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Original question:

TXS02326A: SETTING UP THE SIM INTERFACE

TXS02326A: BSI input of TXS02326A

Lyudmila Voronina
Intellectual 480 points
Part Number: TXS02326A

Hi

1. We do not use BSI input of  TXS02326A.

Can we leave the BSI input open or we must it pull up or pull down if "BSI detection behavior"  bit is 1 in register 0Eh?

2.  IRQ is used to set the I2C address.

Is the IRQ signal the input only during low level of RESET signal?

Thanks

  • 0
    TI__Genius 16725 points

    Hi,

    1. You do not need to have an input at BSI input. However, it has detection levels. ‘0’ 1.2V and ‘1’ 1.65V. So if it is floating, it might give the wrong detection.

    2. IRQ is a CMOS input. So it cannot be left floating. It needs to have a valid state at all times to avoid high current consumption.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Intellectual 480 points

    Hi  Karan

    >>1. You do not need to have an input at BSI input. However, it has detection levels. ‘0’ 1.2V and ‘1’ 1.65V. So if it is floating, it might give the wrong detection.

    Yes,  I agree with you. We 'll correct the electrical circuit.

    >>2. IRQ is a CMOS input. So it cannot be left floating. It needs to have a valid state at all times to avoid high current consumption.

    Yes,  I agree with you. IRQ cannot be left floating, but IRQ can be the input and the output. I want to clarify when IRQ is the input and when IRQ is the output.

    a) Is IRQ the input when RESET = 0?

    b) Is IRQ the output when RESET = 1 and  interruptions are enabled and absent?

    c) Is IRQ the output when RESET = 1 and  interruptions are enabled and present?

    d) Is IRQ the output when RESET = 1 and  interruptions are disabled?

    Thanks

  • 0 in reply to Lyudmila Voronina
    TI__Genius 16725 points

    Hi,

    The device has 2 states. The reset and the operation state. I believe that IRQ is an input during the reset state. This is how you set the slave address and talk to the device.

    During the operation state, IRQ is an output and will get driven when there is one of 2 interrupts unless you disable those interrupts.

    I will add our part expert on this thread to comment and clarify your question.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Intellectual 480 points

    Hi, Karan

    Thanks, I would like to clarify.

    I am waiting

  • 0 in reply to Lyudmila Voronina
    TI__Genius 16725 points

    Hi,

    Do you have any specific questions that you need clarification on? The answer I have given you is accurate. If you disable the IRQ on both those interrupts, it will not be an output but only an input.

    Thanks!

    -Karan

  • 0 in reply to Karan Kotadia
    Intellectual 480 points

    Hi Karan

    >> "If you disable the IRQ on both those interrupts, it will not be an output but only an input."

      I understood, IRQ is the input  as we disable all interrupts. You answered my question.

    Many thanks

  • 0 in reply to Karan Kotadia
    TI__Guru 58370 points

    Hi Lyudmila,

    Yes, I agree with Karan. The INT is listed as I/O port. This means that it must be have valid voltage levels during operation. If interrupts are enabled, the INT will be output when there is a battery removal event or reset event.

    With a weak pulldown, it can be set to a known state; which can be overdriven by the baseband processor during input or by the device during output.

    Is this dual SIM card being used? What are the speeds of operation? These devices were released in 2012 and supports lower frequency of operation ( 5Mhz on SIM CLK as listed in datasheet.) Would this be ok for the system?

  • 0 in reply to ShreyasRao
    Intellectual 480 points

    Hi Shreyas

    >> "Is this dual SIM card being used?"

    Yes, we will use dual SIM card.

    >> "( 5Mhz on SIM CLK as listed in datasheet.) Would this be ok for the system?"

    I think yes.  We 'll be checking soon and then I 'll know exactly.

    Thanks.