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BQ76952: OTP programming is not working

DILEEP SINGH
Intellectual 340 points
Part Number: BQ76952


Dear Sir,

OTP Programming is not working in BQ76952. Although all necessary condition are matching i.e. Device in "FULLACCESS MODE" & "CONFIG UPDATE MODE" but still it is not performing OTP_WR_CHECK(). 

When subcommand address is wriiten at 0x3E & 0x3F and then it is checked it is providing 0xFF 0xFF i.e. command is not getting completed.

But if OTP_WR_CHECK() command is used without entering into "CONFIG UPDATE MODE "  output result is 0x20 i.e. "OTP has been Locked".

  • 0
    TI__Guru 54715 points

    Hi Dileep,

    OTP is believed to work as described in the documents.  Section 3.2 of the Technical Reference Manual indicates that for the OTP_WR_CHECK() command "The device must be in FULLACCESS and CONFIG_UPDATE modes when this subcommand is sent."

    You might see if the application note https://www.ti.com/lit/pdf/sluaa32 is helpful.  Also be aware that OTP commands are slow.