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BQ78350-R1: About question for BQ78350-R1 ManufacturerAccess() 0x0052 / 0x0053 PFAlert

March Jasper
Expert 2340 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQ76930, BQ78350

Hi 

Now our customer using BQ78350R1 with BQ76930  for Battery Pack unit.

The Customer want read   PF Alert  SUV / SOV / SOCC Status .

But I checked  TRM about this description ,  which is correct this status read ??  

We found same description  ManufacturerAccess() 0x0052  and 0x0052 

a)  17.2.36 ManufacturerAccess() 0x0052 PFAlert

SOCC (Bit 2): Safety Overcurrent in Charge
  1 = Detected
  0 = Not Detected
SOV (Bit 1): Safety Cell Overvoltage Failure
  1 = Detected  
  0 = Not Detected
SUV (Bit 0): Safety Cell Undervoltage Failure
  1 = Detected
  0 = Not Detected

b)  17.2.37 ManufacturerAccess() 0x0053 PFStatus

SOCC (Bit 2): Safety Overcurrent in Charge
    1 = Detected
    0 = Not Detected
SOV (Bit 1): Safety Cell Overvoltage Failure
    1 = Detected
    0 = Not Detected
SUV (Bit 0): Safety Cell Undervoltage Failure
   1 = Detected
0 = Not Detected

[ Question ]  

   Which is correct  Status Resister  ?? 

   * We need this information  for Host side  Control Resister . 

Regard

March Jasper   (  Sugimoto ) 

  • 0
    Mastermind 8415 points

    Hi,

    It's been a while since I worked with the BQ78350, but the Alert always occurs before the Status (just as in the safety configurations).

    To understand the difference between the PF Alert and PF Status, the TRM (Permanent Failure chapter) says that the device enters PERMANENT FAIL mode when a PF Status bit is set. So a PF Alert only does not cause the device to enter the PERMANENT FAIL mode.

    In the case of SOCC:

    So, according to this, the PF Alert will be set first when current exceeds the SOCC threshold. The PF Status will be set when the current continuously exceeds the SOCC threshold for the SOCC delay duration. That means the Permanent Failure will only be recorded once the PF Status is set.

    For SOV and SUV, the error is handled using the AFE (the BQ76930). And it is configured through the AFE SUV and SOV configurations. And according to the TRM the PF Alert is therefore never set.

    That being said, if you want to know which Permanent Fail has been set, you need to look at the PF Status register. The PF Alert will only tell whether a permanent failure is imminent.

    Regards,

    Michel