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Original question:

TPS65987D: Host Programming for SPI-Flash Less Systems

TPS65987D: SPI-Flash Less Application, Time Restriction of I2C Patching

Koshi Ninomiya
Expert 5515 points
Part Number: TPS65987D


Hi Team,

In order to use the SPI-Flash Less Application,
Are there any time restriction of I2C Patching timing from Host MCU to TPS65987D after the TPS65987D is enabled from the view point of USB Type-C/PD specifications under the other side device (already active) is connected through USB Type-C?
For example, the I2C Patching from Host MCU to the TPS65987D after the TPS65987D is enabled have to be done within ?? sec.
Thank you.

Best Regards,

Koshi Ninomiya

  • 0
    TI__Expert 4455 points
    Hi Ninomiya-san,

    Time restrictions depend on Boot Mode Pin Strapping configurations for Dead Battery Mode and Device Default Configurations.

    For flash-less systems, I recommend "Infinite Wait" (see Table 7 in the TPS65987D datasheet) to keep the TPS65987D in boot mode until a patch is transferred successfully via the PTCx commands. If the device is allowed to time out of boot mode before a patch is transferred, then it will operate in a set configuration without patch update or user supplied configuration. This could result in operation different than expected.

    Regards,
    Scott