BQSTUDIO: BQ40Z50 Configuration with BQStudio

Hi,

Also, when I try to "write to data memory" I receive an error message stating that "Operation failed because initial read of all data flash failed".

As stated previously, this was not an issue until I made adjustments to the DA configuration settings related to CC1 and CC0.

Best regards,

Joe DeWitt

Also, when I try to send a command I receive an error message stating that "WriteMACReadBlock communication error: No acknowledge from the device" so it definitely appears as though I shut the IC down. Is there some way to restart or reset it in order to reestablish communication?

Best regards,

Joe DeWitt

Finally the error message summary in BQStudio indicates multiple "No acknowledge from device" messages. Please note that this is a custom PCB so we did not include a "wake" tactile switch in the PCB design.

Also, the attached is a screenshot of the registers shows a high value for Sleep mode. Is there a way to tell the IC to exit the sleep mode without the use of the wake tactile switch and just use a command from BQStudio? We did not include the wake tactile switch in the PCB design so this option does not exist. 

Hi Joseph,

Setting both CC1 and CC0 to 0 in the DA Configuration means that the gauge should be expecting only one cell connected. Can you please confirm that there is only one cell connected and tell me what the current voltage of that cell is?

Also, if you are using a custom PCB, can you please confirm that the proper voltage is being received at the BAT pin of the device?

Joseph DeWitt said:

Finally the error message summary in BQStudio indicates multiple "No acknowledge from device" messages. Please note that this is a custom PCB so we did not include a "wake" tactile switch in the PCB design.

The wake button can be mimicked by temporarily connecting the PACK+ line to the BAT line. This should be able to wake the gauge up.

Regards,

Anthony Baldino

Hi Anthony,

The cell configuration is actually 3S3P so the combined nominal cell voltage should be at 10.8 V. Prior to the issue it was reading 11.6 V. Each individual cell will have a nominal voltage of 3.6 V.

So it sounds like the only way to resolve the issue is to wake the IC, is that correct?

Best regards,

Joe DeWitt

Also, in regards to the temporary connection, the Texas Instrument BQ40Z50 IC schematic has a 10 K resistor upstream of the wake tactile switch (R32). There is another 10 K resistor that is connected to the pack terminal (R12). Is one 10 K resistor sufficient or do I need to incorporate a second 10 K resistor into the temporary connection?

Best regards,

Joe DeWitt

Hi Joseph,

Joseph DeWitt said:

The cell configuration is actually 3S3P so the combined nominal cell voltage should be at 10.8 V. Prior to the issue it was reading 11.6 V. Each individual cell will have a nominal voltage of 3.6 V.

Understood, is it possible to attach one cell to the device and see if the device is able to turn on correctly? With the current CC1 and CC0 connection the device is not expecting the current connection.

I would incorporate the second 10K resistor into the temporary connection for PACK+ to BAT just to be safe. 

Regards,

Anthony Baldino

Hi Anthony,

Sounds good, I'll ensure the presence of the 10 K resistor. As far as reconfiguring the battery assembly to a single cell its not really possible but I'll try waking it with the temporary connection is see if that fixed the issue.

I appreciate your support. 

Best regards,

Joe DeWitt

Hi Joseph,

Sounds good, please let us know if there are any other questions that come up regarding bq40z50.

Regards,

Anthony Baldino