Hi，
In my project , I use 2 pieces BQ76940 to measure 20S batteries voltage. There are two problems in my projects
Problem 1:
As the table shows below, from cell1~cell5 there are almost 10mv voltage error, cell6~cell10 there are almost 1mv voltage erro. AS we can see, BQ76940 uses 3.3 as reference voltage, the 10s cell voltage error should be same. Does the Reference voltage is separated in two path，one path for bottom 5s cell and the another for upper 5S cell. And how can i fix this problems?
| battery | accuracy |
| 1 | -0.011 |
| 2 | -0.009 |
| 3 | -0.011 |
| 4 | -0.013 |
| 5 | -0.011 |
| 6 | -0.001 |
| 7 | -0.001 |
| 8 | -0.001 |
| 9 | -0.001 |
| 10 | 0.003 |
| 11 | -0.007 |
| 12 | -0.007 |
| 13 | -0.007 |
| 14 | -0.006 |
| 15 | -0.008 |
| 16 | -0.001 |
| 17 | -0.003 |
| 18 | -0.002 |
| 19 | -0.002 |
| 20 | -0.004 |
Problem 2:
When measure the input voltage of cell 11 on the input capacitor (C11 to C11B), the voltage is not stable, there is almost 300mV changes, but cell 1 on the input capacitor (C1 to VC0), the voltage is stable, is there any problem with it?