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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…
    • 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-Pins…
    • Resolved

  • 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: 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 pin of 74hcxx…

  • 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 writes…
    • 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 patterns…
    • Resolved
    • Answered

  • PCF8574A: PCF8574ADWR change from operation mode to standby mode

    Resolved
    Part Number: PCF8574A Hello, how is standby mode activated from operating mode for this component? Under what conditions will the circuit return from standby mode back to operating mode. Thanks for the anwers. Best regards Karel Skočík
    • Resolved

  • PCF8574A: Reading from P0-P3

    TI Thinks Resolved
    Part Number: PCF8574A Hi Team, Our customer would like to read the inputs from P0-P3 of PCF8574A but can't figure out how to program the device. According to our customer, I see that msp430g2xx3_uscib0_i2c_02.c (ti.com) says its an example for PCF8574A…

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