• TCA9539-Q1: reset of TCA9539-Q1

  

  Hazel Sun

  TI Thinks Resolved

  Part Number: TCA9539-Q1 Hi team, There are 2 questions about TCA9539-Q1: Whether a reset is needed after VCC is on Before manipulating IIC read and write, do I have to pull up reset , and then pull down reset again?

  • 4 days ago
  • Interface
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• TCA9539-Q1: tca9539-q1

  

  Elena Faventi

  Answer Suggested

  Part Number: TCA9539-Q1 Hi, are there any differences in the programming registers between the TCA9555 and the TCA9539? I know that there are differences in the internal pull-up, in the reset pin, in the address I2C, but I don't know if there is some…

  • 3 months ago
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• TCA9539-Q1: Iq

  

  Chuqiang Wen

  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…

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

  

  Byeon SangGyu

  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…

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

  

  HAIBIN MA

  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!

  • 3 months ago
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• TCA9539-Q1: Input has signal before power on

  

  Sherry Liang

  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

  • 7 months ago
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Answered

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

  

  Sherry Liang

  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…

  • Resolved

  • 8 months ago
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Answered

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

  

  Sherry Liang

  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…

  • Resolved

  • 8 months ago
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Answered

• TCA9539-Q1: Schematic review

  

  Baptiste CHERDLE

  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

  • Resolved

  • 11 months ago
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Answered

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

  

  Alihussain Vohra

  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…

  • Resolved

  • over 1 year ago
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