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PGA309: Do we need to add external pull ups on SCL& SDA pins for the PGA309 when we are interfacing it with External EEPROM.

Raghavendra Shenoy66
Prodigy 150 points
Part Number: PGA309


Hi,

I am using PGA309 in one of my product &  want  confirmation on using external pull ups on the SCL and SDA Lines for interfacing PGA309 with the EEPROM. 

Do we need to have external pull ups or does PGA 309 already have pull up's on the SDA and SCL lines.

thanks,

Raghavendra 

  • 0
    TI__Mastermind 23050 points
    Hi Raghavendra,

    If you look in the user's guide for the device then you will see the following statement: "In addition, note that the
    PGA309 SCL and SDA pins have light internal pull-up current sources to VSD (85mA typical on each pin).
    This is more than adequate for most applications that involve placing only the external EEPROM close to
    the PGA309 on the same printed circuit board (PCB). Other applications that add load and capacitance to
    the SDA and SCL lines may need additional external pull-up resistors to VSD to ensure rise timing
    requirements are met at all times."
  • 0 in reply to Zak Kaye
    TI__Genius 11135 points
    Raghavendra

    We haven't heard back from you so we assume this answered your question. If you need more assistance just post another reply below.

    Thanks
    Dennis