BQ34Z100: The BQ34z100 is getting hot while it's not turning on.

Hello,

We are currently looking into this. We will get back with you soon.

Regards,

Nick

Hi Hadoune,

I believe that the REG25 should produce 2.5V when 3.3V is inputted to REGIN:

Can you please confirm whether communication with bqStudio or the host MCU and the gauge can be achieved?

Regards,

Anthony Baldino

When trying to scan for the available devices using I2C, the host microcontroller says that no I2C devices found.

Applying a 3.3V on the REGIN and the Chip Enable pins is sufficient for powering on the BQ34z100, right ?

Hi Hadoune,

Can you please confirm that there is sufficient power on the BAT pin at this time?

Regards,

Anthony

Hi, I can confirm that the BQ is working now, I can get the temperature , charging voltages and other features. But the only problem is that I can't get the current value when charging or discharging the battery! the BQ gives me 0.00A! is there any calibration to do it to get it work or ?

Hi Hadoune,

Can you please confirm that there is current passing across the SRP/SRN pins? Also can you please tell us what sense resistor value is being used?

Regards,

Anthony 

Yes, I am using a 0.1ohm shunt resistor.  Now, I can sense the discharging current which is about 0.8A. However, the charging current starts at 3.4A and decreases which is not normal, since I am using an my dekstop USB that provides at max 0.9A and and an mcp73831 charger that its maximum output current is 500mA. How could this be possible ? Furthermore, when I request the current via I2C using the 0x10 address I got this decreasing values. However, If I use the 0x11 address, I got a 0.008A that is stable which doesn't have any sense! 

Hi Hadoune,

Has any current calibration been done to the device? If not, the video below can be used as a resource:

https://www.ti.com/video/5841163892001?keyMatch=Perform%20current%20calibration%20with%20the%20BQ34Z100-G1

Regards,

Anthony

No! It wasn't calibrated before. Is there any other method to calibrate it without that software? I don't have that adapter allowing the connection to that software.

Hello, I wanted also to note that the voltage values are accurate enough, I confirmed that using a multimeter. However, the current values are still not precise. If there's any calibration process that can resolve the issue I would be happy to follow it.