BQ76952EVM: PACK+ and PACK- is not closed

Nivya Kuzhivila Pannickottu

Part Number: BQ76952EVM

Hi,

I am trying to calibrate current by giving a constant current of 3000mA across the PACK+ and PACK- of the BQ76952EVM board. I connected a 42V DC supply across BAT- and CELL16 and used the cell simulator to calibrate the cell voltage, PACK, STACK and LD voltages. Data Memory:Configuration:TS1 Config and Data Memory:Configuration:TS3 Config have the value Hex 07. So, I tried to calibrate the temperatures by ticking Sensor 1 and Sensor 3 in Calibration:Temperature Calibration. But it gives an error and does not calibrate. It did work once though. Also for the Current Gain Calibration, I connected PACK+ and PACK- with a 12V supply in series with 4ohm resistor which should ideally give 3A flowing through this circuit. But it shows 0A in the multimeter and reader, and now I cannot calibrate current. This makes me doubt if I disabled any FET by mistake. But I followed the Training videos go set the register values in Data Memory. Are there any default configurations that is a must to ensure that I have a closed circuit?

over 4 years ago

0 Caleb Perez over 4 years ago

TI__Genius 14145 points

Hey Nivya,

Are you using the FET_EN command to enable the charge and discharge FETs? Make sure that your CUV and COV protections are set to the appropriate values for your test case so that the device doesn't automatically go into a fault.

In BQ Studio, you can the status of the discharge/charge fets to see if they are activated or not.

Thanks,
Caleb

0 Nivya Kuzhivila Pannickottu over 4 years ago in reply to Caleb Perez

Prodigy 30 points

Hi Caleb,

Thanks for the reply.

I am currently having trouble with voltage calibration. It was working just fine earlier. The CHG and DSG FETs are on, I used FET_EN command. I can see the values of the cells, stack and pack in Registers window. I checked if the units that I am using to calibrate is aligned with Data Memory:Settings:DA Configuration. It says 'The first two bytes of MAC response read from the device does not match MAC Command sent'. What are the other things that I look for to make sure I am doing it right?

0 Caleb Perez over 4 years ago in reply to Nivya Kuzhivila Pannickottu

TI__Genius 14145 points

Hey Nivya,

Next thing to check would be your software version numbers. Can you send me a similar screenshot of your BQ Studio screen?

Make sure your device is connected.

Thanks,
Caleb

0 Nivya Kuzhivila Pannickottu over 4 years ago in reply to Caleb Perez

Prodigy 30 points

Sure, here is the screenshot

0 Caleb Perez over 4 years ago in reply to Nivya Kuzhivila Pannickottu

TI__Genius 14145 points

Hey Nivya,

Your versions are correct. I'm not sure what is giving you so many issues. Please recheck all of your headers, connections, and ensure that you follow the EVM user guide thoroughly.

Thanks,
Caleb

0 Nivya Kuzhivila Pannickottu over 4 years ago in reply to Caleb Perez

Prodigy 30 points

Hi Caleb,

Once the calibration is successful and if the file is exported and saved, the parameters in this file can be used to perform tests right? Does importing the same file also update all the cell gains and thresholds that was set earlier?

0 Caleb Perez over 4 years ago in reply to Nivya Kuzhivila Pannickottu

TI__Genius 14145 points

Hey Nivya,

Yes, importing the file imports all of your calibration settings, cell gain, thresholds, etc. as well.

Thanks,
Caleb

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BQ76952EVM: PACK+ and PACK- is not closed