Answered

• RE: TCA9539-Q1: TCA9539-Q1：Interrupt behavior

  

  Tyler Townsend

  Resolved

  Heater, Say the original state of your input is HIGH (logic 1). If that pin is changed to an output, the output will continue to operate without causing an interrupt on /INT. If you change that pin from an output to and input, and the input logic state…

  • 18 days ago
  • Interface
  • Interface forum

• TCA9539-Q1: TCA9539 output default output state

  

  Scarlett Cao

  TI Thinks Resolved

  Part Number: TCA9539-Q1 Tool/software: Hi team, Customer is using TCA9539-Q1 for output channel expansion. they want to know when TCA9539-Q1 1) nreset pin low and 2) first power up, what the default output state, pull high or low? Thanks Scarlett

  • 1 month ago
  • Interface
  • Interface forum

• RE: TCA9539: TCA9539

  

  Tyler Townsend

  Hi Arabella, Is port 1 floating? It could be possible that port 2 / 3 changing voltage could cause port 1 to change state due to floating pin? If this is not the case, please show the I2C SDA & SCL for the frame that is being written to cause this issue…

  • 2 months ago
  • Interface
  • Interface forum

• TCA9539-Q1: PWM drive compatible of TCA9539-Q1

  

  Natsuki Hayasaka

  TI Thinks Resolved

  Part Number: TCA9539-Q1 Other Parts Discussed in Thread: TCA9539 , LP5861 Tool/software: Hi Team I'd like to ask you some questions about the I/O expander IC TCA9539. Are each of these I/O ports compatible with PWM drive? If not, do you have any…

  • 2 months ago
  • Interface
  • Interface forum

• TCA9539-Q1: How to set read and write commands

  

  guojia fu

  Answer Suggested

  Part Number: TCA9539-Q1 Other Parts Discussed in Thread: TDA4VM Tool/software: Hi team, Currently, the TDA4VM is in use(mcu1_0) with the SDK version of TDA4VM_SDK_10.05. If the I2C address of my chip is 0x74 1,When I want to set P00 to output high…

  • 11 days ago
  • Interface
  • Interface forum
Answered

• TCA9539: i2c interface timing requirements

  

  user_CAP

  Resolved

  Part Number: TCA9539 Other Parts Discussed in Thread: TMS570LS1114 Tool/software: hello: I have a question about I2C Fast mode, 400kbps, the specification about of tocf (I2C output fall time- 10-pF to 400-pF Bus), the minimum time is 20*（VCC/5.5V）…

  • Resolved

  • 1 month ago
  • Interface
  • Interface forum
Answered

• TCA9539: TCA9539RTWR output status

  

  Lisa Xu

  Resolved

  Part Number: TCA9539 Tool/software: Dear TI Team: I just want to check IO expander_TCA9539RTWR output status. When one Port of TCA9539RTWR is set to output, it will have 3 status: High,low, and High impedance , Right? Best Regards Lisa

  • Resolved

  • 2 months ago
  • Interface
  • Interface forum
Answered

• TCA9539: schematic review

  

  Jeff YANG

  Resolved

  Part Number: TCA9539 Other Parts Discussed in Thread: PCF8574 , TCA9554 , TCA9554A , TCA9555 , PCF8574A , PCA9554A , PCA9555 , PCA9554 , PCF8575 Tool/software: Hi, Would you please hlep review below TCA9539 schematic? thanks! 1108.pdf Jeff

  • Resolved

  • 2 months ago
  • Interface
  • Interface forum
Answered

• TCA9539-Q1: How TCA9539QPWRQ1 handles interrupt signals?

  

  Daoyan Zhao

  Resolved

  Part Number: TCA9539-Q1 Tool/software: Hi Expert, May I ask 1. How TCA9539QPWRQ1 handles interrupt signals when receive them, regardless of whether they are level triggered or pulse triggered? 2. How TCA9539QPWRQ1 handles when it is edge triggered? Will…

  • Resolved

  • 2 months ago
  • Interface
  • Interface forum

• TCA9539-Q1: How should we deal with unused pin of TCA9539-Q1

  

  junsong gu

  TI Thinks Resolved

  Part Number: TCA9539-Q1 Tool/software: HI TI, How should we deal with unused pin of TCA9539-Q1? What is the reset state of these pin? Can we just left it float? BR Junsong Gu

  • 4 months ago
  • Interface
  • Interface forum

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