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  • PCF8574A: PCF8574A IC permanently damaged and SDA/SCL lines latched low

    Part Number: PCF8574A Tool/software: Attached is a diagram/doodle of the circuit being used. Conditioning components are mitigated for simplicity but they all conform to datasheet recommendations for filtering and the like. The PCF8574A is being used…

  • PCF8574A: How to Prevent Missing Interrupts on PCF8574A During I2C ACK Phase?

    TI Thinks Resolved
    Part Number: PCF8574A Other Parts Discussed in Thread: TCA9539 , TCA8418E Tool/software: Question: I'm using the PCF8574A I/O expander in a project and encountering an issue with its interrupt (INT) line. The device generates an interrupt on any rising…

  • PCF8574A: PCF8574ADWR does not transfer data to output

    Answer Suggested
    Part Number: PCF8574A Other Parts Discussed in Thread: TCA9534A , TCA9534 , , PCF8574 Tool/software: Hello, I am using PCF8574ADWR connected according to the attached diagram. After sending data to the output, there is no data on the outputs, despite…

  • PCF8574A: interfacing PCF8574APWR with 74HC4051PW

    TI Thinks Resolved
    Part Number: PCF8574A Other Parts Discussed in Thread: INA138 , ADS7830 Tool/software: Dear All, I have to interface your PCF8574APWR with 74HC4051PW . In particular: Both pin will be powered at 3,3V the PCF P7,P6,P5 will activate the control…
    • Answered

  • PCF8574A: Leaving 3V3 on input pins while removing VCC for resetting the IC

    Resolved
    Part Number: PCF8574A Other Parts Discussed in Thread: TCAL9539 Tool/software: Hello, we are considering using the PCF8574A Remote 8-Bit I/O Expander and reading the datasheet following questions came up: Is it allowed to have 3V3 on the P[0..7] IO…
    • Resolved
    • Answered

  • PCF8574A: PCF8574A not responding to 0x71 address for A0, A1, A2 grounded

    Resolved
    Part Number: PCF8574A Hi, I am trying to use the IO expander chip PCF8574A to READ ports P5-P7. I do not have any devices connected on these ports, the pins are just pulled up or pulled down so that they return either 1 or 0 (these help with binary…
    • Resolved

  • TMS320F28379D: PCF8574A interface for reading P0-P7 data

    Part Number: TMS320F28379D Other Parts Discussed in Thread: PCF8574A , C2000WARE Tool/software: can you post what are i2c configurations you have used for interfacing PCF8574A and sample code of it for reference?

  • PCF8574A: Output not latching HIGH

    Part Number: PCF8574A Other Parts Discussed in Thread: PCF8574 IS the 2005 waiver still in affect?
    • Answered

  • PCF8574: PCF8574 and PCF8574A failing I2C ACK to TIVA Processor when bit 0 = 0

    Resolved
    Part Number: PCF8574 Other Parts Discussed in Thread: , TM4C129ENCPDT , P82B715 I am writing to PCF8574 and PCF8574A devices using the TI driver under TIRTOS. TM4C129ENCPDT processor, latest TIRTOS available for this processor is being used. The…
    • Resolved
    • Answered

  • PCF8574A: PCF8574A Keypad 4X4 interfacing question

    Resolved
    Part Number: PCF8574A Hello, I have seen several posts like this for using PCF8574A to use the Keypad as an I2C peripheral. Some of them are using pullups for the columns and others don't. I have attached my design and I would appreciate the feedback…
    • Resolved

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