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  • TMS320F28386D: CM-I2C config as slave holds the SDA line low after glitches in SCL. How to recover?

    Resolved
    Part Number: TMS320F28386D Tool/software: Hello, I am working with the TMS320F28386D (referred to as "DSP" below), which is configured as an I2C slave on a shared bus. The Connectivity Manager (CM) receives commands via I2C (CM-I2C), while the C28x…
    • Resolved

  • RE: BQ25190: BQ25190

    Hi Joe, Thanks for reaching out. I have a few questions to help narrow this down: Is there a consistent bus state when I2C is locked? Is SDA low while SCL is high? Is SCL stuck low? When you tried bit banging SCL, did you also generate a STOP…

  • MSP430FR2433: MSP430 BSL I2C issue - SCL hangs low

    Part Number: MSP430FR2433 Tool/software: I am trying to initiate a firmware update on MSP430 (MSP430FR2433) via I2C. After i enter the BSL, I can see that the MSP430 responds to address 0x48 ( cuz i do get an ACK if i send the address ). But sending…

  • TPS6594-Q1: PMIC stuck in reset output low

    Part Number: TPS6594-Q1 Tool/software: Hi, I am using TPS6594141BRWERQ1 and LP876441B1RQKRQ1 for DRA821U4-Q1 the TPS6594-Q1 reset output is low, no chance, so SOC cannot bootup do you have any clue what causes this stuck? Thanks Max

  • 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…

  • BQ25895: I2C line stuck low (SCL)

    Part Number: BQ25895 We have discovered some sort of glitch state or failure mode where the SCL pin on the BQ25895 becomes stuck pulling low, thus stalling the I2C bus indefinitely. Once the device enters this state it persists across power cycles,…

  • BQ25190: BQ25190

    Part Number: BQ25190 Tool/software: Thanks for reaching out. I have a few questions to help narrow this down: Is there a consistent bus state when I2C is locked? Is SDA low while SCL is high? Is SCL stuck low? [Reply]In some cases its only one…

  • AM623: I2C controller becomes stuck under high load

    TI Thinks Resolved
    Part Number: AM623 Tool/software: Hello, We run into the same problem as in the linked original post. Since then some time has passed and I wanted to check, whether there are any known issues with the controller in stress scenarios? We have a TQMa62xx…
    • Answered

  • RE: UCD3138: Boot ROM holds SCL low until CLK_LOW_TIMEOUT instead of ACK/NACKing address

    Resolved
    The timing looks similar enough to me. From the last waveform, seems like SCL is trying to go high but stuck at low. Maybe you can check the FT4232 board setting. This is unlikely UCD related

  • RE: DS90UB941AS-Q1: 941(local) + 948(remote) , remote i2c stuck low

    Hi Shuming, I was able to look at the I2C waveform. Here is the main issue I see (starting at 43.492s). The SoC initiates the 16-byte read from the MCU and we are able to get one byte from the MCU. During the readback, the MCU is driving the SDA…

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