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  • TCA9539-Q1: how to use tca9539-Q1, just use read mode help

    Answer Suggested
    Part Number: TCA9539-Q1 Other Parts Discussed in Thread: TCA9539 Hi, anybody I tested tca9539-Q1. I read datasheet of tca9539. So, I understand the slave address this ic 0x74 / (A1, A0 is LOW, 1110100) and to use it only read function, 0xE9 (1110100…

  • TCA9539-Q1: Iq

    TI Thinks Resolved
    Part Number: TCA9539-Q1 Hi expert, I checked from datasheet, when I/O=input and no load, Iq as below. My question is that if I/O=output and the output level is low or high voltage, I/O connects to NMOS Gate pin. What is the Iq in this condition? Does…

  • TCA9539-Q1: What is the GPIO output state when I2C communication is abnormal disrupted?

    TI Thinks Resolved
    Part Number: TCA9539-Q1 Other Parts Discussed in Thread: TCA9539 , Dear Expert， I want to know when the TCA9539's I2C is disrupted, the GPIO will remain output level or reset to the power-on state? Thanks!
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  • TCA9539-Q1: Input has signal before power on

    Resolved
    Part Number: TCA9539-Q1 Dear team, Due to SOC's power on sequence, we give 3.3V signal to 9539's input port before powering on 9539. Will this affect the normal operation of our chip? Thanks & Best Regards, Sherry
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    • Answered

  • TCA9539-Q1: the relationship between RESET and INT pin

    Resolved
    Part Number: TCA9539-Q1 Dear team, We don't plan to use RESET pin, so we connect this pin to VSYS_3V3 with a pullup resistor. But we found that INT pin is always low when RESET connect to VSYS. in addition, VCC connects to VSYS_3V3, and this power…
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    • Answered

  • TCA9539-Q1: Schematic review

    Resolved
    Part Number: TCA9539-Q1 Hello, Is it possible to perform a schematic review of the attached document? Thanks in advance, B.CHERDLE 06-InternalPeripherals.pdf
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    • Answered

  • TCA9539-Q1: Can our device support 0-24V input signal?

    Resolved
    Part Number: TCA9539-Q1 Other Parts Discussed in Thread: TCA9539 Dear team, In BCM design, the input signal will connected to the IO EXPANDER directly, the input signal is 0~24V. As the IO EXPANDER’s power rail is 3.3V / 5V, normally the GPIO of…
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    • Answered

  • TCA9539-Q1: TCA9539-Q1 output flicker at initialization

    Resolved
    Part Number: TCA9539-Q1 Hello, I am using TCA9539-Q1 (IO Expander). I am attaching my schematic. I want to use IO expander as OUTPUT so I have configured both port as output. I need the output to be low at power up so I write "0x00" to both output port…
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  • TCA9539-Q1： The output pin of TCA9539 appears high level during power-on.

    Resolved
    Part Number: TCA9539-Q1 Other Parts Discussed in Thread: TCA9539 I configured the pins of TCA9539 as outputs. I found that when the chip is powered on, all output pins will have a high level for a short time. What is the cause? Will it interfere with external…
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    • Answered

  • TCA9539-Q1: float RESET pin

    Resolved
    Part Number: TCA9539-Q1 Dear team, My customer connects to the wrong pin for the reset pin in the A sample board, but they need to test this board before B sample board is completed, so they have to disconnect reset pin and GPIO pin of SOC. Under this…
    • Resolved

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