Hi everyone,
I’m working on BQ27441 breakout board, parameters configuration. During a memory dump of some subclass (ex Subclass 49 SOC Threshold) I founded few parameters different from Texas Instruments default values. How is possible? Does Soldered change some parameters on evaluation board? Also some reserved bit are different from default values (subclass 64)
Hello Fabrizio,
I can assure you that we do not reprogram the BQ27441 chips used on our breakout board. The differences you are seeing could most likely be the self learning aspects of said chip, especially if that area is concerning the SOC Threshold. As stated in the datasheet:
The key to the high-accuracy, fuel gauging prediction is Texas Instruments proprietary Impedance Track™ algorithm. This algorithm uses cell measurements, characteristics, and properties to create SOC predictions that can achieve high accuracy across a wide variety of operating conditions and over the lifetime of the battery.
First of all thank you very much, I solved last night. It’s very hard to get correct parameters from BQ27441, was a bug inside a i2c function that return some parameters wrong. Very strange, but now everything is running properly.
best regards