TI中文支持网本次做了几套板子，但是在测电流的时候发现BQ76925输出的电流检测电压中心点一直在变，导致后面充电或放电的电流都测不准，不知道什么原因？请高手指点！3.3V没有用76925的输出，而是外部单独接的3.3V电源供电，BAT和VCTL两个脚是直接短接的，V3P3是外部提供的，和MCU共用的一个3.3V电源，MCU和76925也是共的同一个地。
Star Xu：
请参考下面的建议
Check the connection of VSS to battery- (GND or reference potential) as shown in figure 22 of the data sheet. The simple schematic on the first page of the data sheet or figure 16 do not make that connection clear. If the connection is missing the circuit will not have a reference to GND. The VIOUT circuit is not a differential measurement circuit but a single ended measurement which is switched between the 2 inputs. Note that the definition of the SENSEN and SENSEP connections is shown in the diagrams puts the SENSEP at the pack side of the sense resistor.To determine the current the difference of the 2 inputs should be calculated. If the connection between the SENSEN and VSS have much trace length, there can be significant change in the SENSEN voltage with current variation. Since you have a relatively large Rsense, the resistor would be expected to have most of the voltage.Be aware of the resolution of the MCU ADC and the granularity it introduces. If you have used the EVM you may have noticed the reported current change by a relatively large step from one count of the ADC.Of course check that pins and other components are soldered well. Compare other assembled example boards. Consider if the component may have been damaged during assembly.
