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BQ76930: The error of OCD threshold is much higher than spec

John11513
Expert 5570 points
Part Number: BQ76930

Hi,

My customer reported that they observed the error of OCD threshold is much higher than our datasheet spec. Based on datasheet, the threshold should be within 100mV+/-12.5mV, however, the measured result is arround 73.6mV, much lower than MIN spec. The voltage is measured with DVM dirrectely on SRP/SRN pins and electric load is applied on battery pack output. And also they reported that the ADC reading of the load current is fairly accurate. Bellow is the connection of SRP/SRN pins.

Thank you,

John

  • 0
    TI__Guru 54715 points
    Hi John,
    Be sure you are not changing the PROTECT3 register (address 0x08) reserved bits [3:0] when you write the register. Early versions of the data sheet incorrectly showed the reset value of the register as 0x04 while the actual reset value is 0x00. Designers who used the data sheet value as the basis of the register value rather than value from the part have experienced a shift as you describe. Refer to the latest data sheet or use the reset value from the part. PROTECT3[3:0] should be 0 for proper operation.
  • 0 in reply to WM5295
    TI__Expert 5570 points
    You are right. The threshold is accurate enough now once they re-configure the PROTECT3 register as 0x00. Thank you for your efficient help!