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Original question:

TPS56520: I2C Timing Requirement

TPS56520: I2C: SCL clock frequency

Jack Shen2
Expert 4045 points
Part Number: TPS56520

Hi, 

I have two questions about I2C SCL rate for TPS56520. 

1. What is the I2C SCL default mode for TPS56520? Standard mode (100khz)? 

2. Is there a option to change the mode from the standard mode to fast mode (400khz)?

Thanks. 

  • 0
    TI__Guru 50055 points

     

    The TPS56520 supports both standard and fast mode I2C communication.  The SCL frequency is set by the I2C Controller initiating communication with the TPS56520, and the TPS56520 can support any SCL frequencies upto 400kHz.

  • 0 in reply to Peter James Miller
    TI__Expert 4045 points

    Thanks for the reply. 

    Is there a section in TPS56520 to instruct the users how to set to the fast mode? or that's the standard protocol from I2C spec.? 

  • +1 in reply to Jack Shen2
    TI__Guru 50055 points

     

    The User does not need to take any action to allow the TPS56520 to respond to Fast Mode (400kHz) traffic.  By default, the I2C interface will operate at what every external SCL frequency is provided, upto 400kHz.  

    If the I2C controller driving the SCL and SDA pins is operating at 10kHz, 50kHz, 80kHz, 100kHz, 250kHz, 333.317kHz, or 400kHz, the TPS56520 will operate its I2C at the frequency provided. 

    SCL frequencies greater than 400kHz could introduce communications and bit errors.

    This is per the I2C specification, the I2C bus controller, not the TPS56520, which is an I2C target device, drives the SCL pin and sets the frequency.