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PGA309EVM-USB: Load EEPROM with file

Robert S1
Prodigy 60 points
Part Number: PGA309EVM-USB
Other Parts Discussed in Thread: PGA309,

Hi all,
I just want to confirm one thing:
Does button "Load EEPROM with file" write EEPROM TXT file into PGA309 EEPROM permanently?


Thanks

  • 0
    TI__Guru 55466 points

    Hi Robert,

    In the PGA309EVM-USB, this function will write the EEPROM contents. 

    Assuming that the TI flag, and the Checksum contents are valid, the PGA309 will update the calibration settings after power up.  Please note that the PGA309 will check both the TI flag and checksum contents are valid prior loading the settings.  The EEPROM contents will remain, unless of course, the EEPROM is re-programmed again. 

    If after performing a calibration, you wish to keep the values of the EEPROM and avoid any chance of unintentional re-programming of the EEPROM, you could choose to disable the one-wire interface by setting OWD='1'. In four-wire applications after the final EEPROM program write after performing calibration is complete,  setting OWD='1' helps prevent any chance of periodic noise causing issues with the PGA309 or EEPROM programming after calibration has been performed.

    Setting the OWD to "1" disables the one-wire interface after 25-ms after power-up. When OWD is set to ‘1’ (Register 4, bit D15), the time interval after power-up is the only opportunity that an external communications controller can initiate digital communication with the PGA309 one-wire interface and trigger a one second delay in the internal state machine.   If OWD is set to ‘1’, after a initial POR is completed, and a valid Checksum2 is received, the One-Wire interface will be disabled after a 25-ms delay, and the PRG pin becomes high impedance, and One-Wire communication cannot take place unless power is cycled.

    The OWD is discussed on a few sections of the PGA309 User Guide:

    - Section 3.1 "Power-On Sequence and Normal Stand Alone Operation" on page 60 of the user guide,

    - Section 4.8, "PGA309 Stand-Alone Mode and Two-Wire Transactions", on page 83, 

    - Section 4.10 "One-Wire Operation with PRG Connected to VOUT" page 88, and figure 4-16 page 90.

    - Section 4.11,  "Four-Wire Modules and One-Wire Interface (PRG)" page 91.

    Alternatively, some users, in their sensor solution (not the EVM hardware), choose to enable the EEPROM WP pin in their hardware to protect the EEPROM contents.

    Also, please take a look at this forum query below regarding the EEPROM and OWD when using the EVM:

    https://e2e.ti.com/support/amplifiers/f/14/p/834813/3088499#3088499

    Thank you and Regards,

    Luis